About EDGAR Online | Login
 
The following is an excerpt from a S-1/A SEC Filing, filed by CELLOMICS INC on 4/14/2000.
Next Section Next Section Previous Section Previous Section
CELLOMICS INC - S-1/A - 20000414 - CAPITALIZATION

CAPITALIZATION

The following table shows:

- our capitalization and short-term debt on December 31, 1999;

- our capitalization and short-term debt on December 31, 1999, on a pro forma basis giving effect to the sale of our Series B preferred stock completed after December 31, 1999 for aggregate proceeds of $6.5 million, the conversion of $1.8 million in demand notes, plus accrued interest, into our Series B preferred stock, and the conversion of our Series A and Series B preferred stock into common stock; and

- our capitalization and short-term debt on December 31, 1999, on a pro forma as adjusted basis, giving further effect to the sale of 6,000,000 shares of our common stock in this offering, assuming an initial public offering price of $17.00 per share and the receipt and application of the net proceeds from this offering.

                                                                    AS OF DECEMBER 31, 1999
                                                        -----------------------------------------------
                                                                          PRO             PRO FORMA
                                                          ACTUAL         FORMA         AS ADJUSTED (1)
                                                        ----------     ----------     -----------------
                                                        (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
Current maturities of long-term debt..................   $    911       $    911           $    911
                                                         ========       ========           ========
Long-term debt less current maturities................   $  3,745       $  2,036           $  2,036
                                                         --------       --------           --------
Mandatorily redeemable convertible preferred stock,
  $.01 par value; 7,150,534 shares authorized,
  6,946,095 shares issued and outstanding, actual; no
  shares authorized, issued, or outstanding pro forma
  and pro forma as adjusted...........................     12,153             --                 --
                                                         --------       --------           --------
Stockholders' equity (deficit):
  Preferred stock, $.01 par value; no shares
     authorized, issued or outstanding, actual and pro
     forma; 17,660,000 shares authorized, no shares
     issued and outstanding, pro forma as adjusted....         --             --                 --
  Common stock, $.01 par value, 17,660,000 shares
     authorized, 4,183,015 shares issued and
     outstanding, actual, 13,579,169 shares issued and
     outstanding pro forma; 176,600,000 shares
     authorized, 19,579,170 shares issued and
     outstanding, pro forma as adjusted...............         42            136                196
  Additional paid-in capital..........................      3,263         22,237            115,787
  Deferred compensation...............................     (1,907)        (1,907)            (1,907)
  Accumulated deficit.................................    (17,132)       (17,132)           (17,132)
                                                         --------       --------           --------
  Total stockholders' equity (deficit)................    (15,734)         3,334             96,944
                                                         --------       --------           --------
  Total capitalization................................   $    164       $  5,370           $ 98,980
                                                         ========       ========           ========


(1) The number of shares pro forma as adjusted for this offering excludes:

- 2,623,923 shares of common stock reserved for issuance under our stock option plans, of which 1,762,581 shares were subject to outstanding options as of March 31, 2000, at a weighted average exercise price of $0.50; and

- 1,575,166 shares of common stock issuable on exercise of outstanding warrants as of March 31, 2000, at a weighted average exercise price of $2.18.

18

DILUTION

You will experience immediate and substantial dilution in the net tangible book value of your common stock. Net tangible book value is our total assets minus the sum of our total liabilities, mandatorily redeemable convertible preferred stock and intangible assets. Net tangible book value per share is net tangible book value divided by the number of shares of common stock outstanding. At December 31, 1999, we had net tangible book value (deficit) of $(15.7) million, or $(3.76) per share of common stock. The assumed conversion of our Series A preferred stock upon the closing of this offering will increase net tangible book value by $10.8 million or $3.32 per share. The sale of our Series B preferred stock for aggregate proceeds of $6.5 million and the conversion of $1.8 million in demand notes, plus accrued interest, into Series B preferred stock, both of which transactions were completed after December 31, 1999, followed by the assumed conversion of the Series B preferred stock upon the closing of this offering will increase net tangible book value by $8.3 million or $0.69 per share. Pro forma net tangible book value after giving effect to the conversion of the Series A and Series B preferred stock is $3.3 million or $0.25 per share. After giving effect to the sale of shares of common stock in this offering at an assumed initial public offering price of $17.00 per share and receipt and application of the net proceeds therefrom after deducting underwriting discounts and commissions and estimated offering expenses, our pro forma net tangible book value at December 31, 1999 would have been $96.9 million, or $4.95 per share. This represents an immediate increase in net tangible book value of $4.70 per share to existing stockholders and an immediate and substantial dilution of $12.05 per share to new investors purchasing our common stock in this offering. The following table illustrates this per share dilution.

Assumed initial public offering price.......................            $17.00
                                                                        ------
     Net tangible book value (deficit) per share as of
      December 31, 1999.....................................  $ (3.76)
     Increase attributable to conversion of Series A
      preferred stock.......................................     3.32
     Increase attributable to the issuance of Series B
      preferred stock and subsequent conversion.............     0.69
                                                              -------
       Pro forma net tangible book value as of December 31,
        1999................................................     0.25
     Increase in net tangible book value attributable to new
      investors.............................................  $  4.70
                                                              -------
Pro forma net tangible book value as of December 31, 1999,
  after giving effect to this offering......................              4.95
                                                                        ------
Dilution to new investors...................................            $12.05
                                                                        ======

The following table shows the difference between existing stockholders and new investors in this offering with respect to the number of shares of common stock purchased from us, the total consideration paid and the average price paid per share, before deducting underwriting discounts and commissions and offering expenses.

                                  SHARES PURCHASED           TOTAL CONSIDERATION
                                ---------------------      -----------------------      AVERAGE PRICE
                                  NUMBER      PERCENT         AMOUNT       PERCENT        PER SHARE
                                ----------    -------      ------------    -------      -------------
Existing stockholders.........  13,579,170      69.4%      $ 21,392,092      17.3%         $ 1.58
New investors.................   6,000,000      30.6        102,000,000      82.7           17.00
                                ----------     -----       ------------     -----
       Total..................  19,579,170     100.0%      $123,392,092     100.0%
                                ==========     =====       ============     =====

The discussion and tables above assume no exercise of outstanding options or warrants to purchase shares of common stock. As of December 31, 1999, there were 1,518,760 shares of common stock authorized for issuance under our stock option plans, of which 1,184,633 shares were subject to outstanding options, at a weighted average exercise price of $0.16, and 1,575,166 shares of common stock issuable upon exercise of outstanding warrants as of December 31, 1999, at a weighted average exercise price of $2.18. To the extent that any outstanding options or warrants are exercised, there will be further dilution to new investors.

19

SELECTED FINANCIAL DATA

The statement of operations data for each of the years ended December 31, 1997, 1998 and 1999 and the balance sheet data as of December 31, 1998 and 1999 have been derived from our financial statements included elsewhere in this prospectus which have been audited by PricewaterhouseCoopers LLP, independent accountants. The statements of operations data for the period from May 3, 1995, the date of inception, to December 31, 1995 and the year ended December 31, 1996, and the balance sheet data as of December 31, 1995, 1996 and 1997 have been derived from our audited financial statements not included in this prospectus. Our historical results are not necessarily indicative of results to be expected for any future period. The data presented below have been derived from financial statements that have been prepared in accordance with accounting principles generally accepted in the United States and should be read with our financial statements, including the notes, and with "Management's Discussion and Analysis of Financial Condition and Results of Operations" included elsewhere in this prospectus.

The pro forma net loss per share for the year ended December 31, 1999 assumes conversion of the Series A preferred stock outstanding at December 31, 1999 into common stock on a one for one basis on January 1, 1999, or the date of issuance if later. The Series A preferred stock will automatically convert into common stock upon the closing of this offering.

The pro forma balance sheet data presented below give effect to the sale of shares of our Series B preferred stock after December 31, 1999 for aggregate proceeds of approximately $6.5 million, the conversion of $1.8 million in demand notes, plus accrued interest, into Series B preferred stock, and the conversion of our Series A and Series B preferred stock into common stock upon the closing of this offering, as if such sale and conversions had occurred at December 31, 1999. The pro forma as adjusted balance sheet data reflect the sale of 6,000,000 shares of common stock in this offering at an assumed initial public offering price of $17.00 per share, after giving effect to the receipt and application of the net proceeds from the offering. You should read the selected financial data together with our financial statements and the sections of this prospectus entitled "Capitalization" and "Management's Discussion and Analysis of Financial Condition and Results of Operations."

                                                       FROM DATE
                                                     OF INCEPTION                   YEAR ENDED DECEMBER 31,
                                                   (MAY 3, 1995) TO    -------------------------------------------------
                                                   DECEMBER 31, 1995      1996         1997         1998         1999
                                                   -----------------   ----------   ----------   ----------   ----------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
STATEMENT OF OPERATIONS DATA:
Revenues.........................................      $     36        $      363   $      395   $    2,273   $    3,390
Operating costs and expenses:
  Costs of product sales.........................            --                --           --           --          405
  Research and development.......................            57               257        1,486        3,948        9,509
  Selling, general and administrative............            83               578        1,334        1,834        3,933
                                                       --------        ----------   ----------   ----------   ----------
    Total operating costs and expenses...........           140               835        2,820        5,782       13,847
Loss from operations.............................          (104)             (472)      (2,425)      (3,509)     (10,457)
Interest income (expense), net...................            (1)               (5)         (13)          14         (161)
                                                       --------        ----------   ----------   ----------   ----------
Net loss.........................................      $   (105)       $     (477)  $   (2,438)  $   (3,495)  $  (10,618)
Accrued dividends and accretion on mandatorily
  redeemable convertible preferred stock (1).....            --                --           --         (518)        (933)
                                                       --------        ----------   ----------   ----------   ----------
Net loss attributable to common stockholders.....      $   (105)       $     (477)  $   (2,438)  $   (4,013)  $  (11,551)
                                                       ========        ==========   ==========   ==========   ==========
Net loss per share-basic and diluted.............      $  (0.05)       $    (0.13)  $    (0.61)  $    (0.99)  $    (2.77)
                                                       ========        ==========   ==========   ==========   ==========
Shares used to compute basic and diluted net loss
  per share......................................         1,917             3,588        3,986        4,070        4,175
                                                       ========        ==========   ==========   ==========   ==========
Pro forma net loss per share (2).................                                                             $    (0.97)
                                                                                                              ==========
Shares used to compute pro forma net loss per
  share (2)......................................                                                                 10,990
                                                                                                              ==========


(1) The increase in net loss attributable to common stockholders due to accretion on mandatorily redeemable convertible preferred stock will not occur after this offering because all of the outstanding preferred stock will be converted to common stock upon the closing of this offering.

(2) See Note 9 to our financial statements for an explanation of the number of shares used in computing pro forma net loss per share and the pro forma net loss attributable to common stockholders.

20

                                                                  AS OF DECEMBER 31,
                                        -----------------------------------------------------------------------
                                        1995    1996      1997      1998                    1999
                                        ----   -------   -------   -------   ----------------------------------
                                                                                                     PRO FORMA
                                                                              ACTUAL    PRO FORMA   AS ADJUSTED
                                                                             --------   ---------   -----------
                                                                    (IN THOUSANDS)
BALANCE SHEET DATA:
Cash and cash equivalents.............  $ 3    $ 1,389   $   319   $   662   $  1,341    $ 7,872      101,482
Working capital (deficit).............   (8)     1,375      (806)      409     (1,223)     3,984       97,594
Total assets..........................   72      1,679       745     3,963      5,860     12,379      105,989
Total long-term debt less current
  maturities..........................   --         --       500       653      3,745      2,036        2,036
Mandatorily redeemable convertible
  preferred stock.....................   --         --        --     6,252     12,153         --           --
Total stockholders' equity
  (deficit)...........................   36      1,385    (1,053)   (4,994)   (15,734)     3,334       96,944

21

MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with the "Selected Financial Data," and the accompanying financial statements and related notes included elsewhere in this prospectus. This discussion and other parts of this prospectus contain forward-looking statements which involve risks and uncertainties. Our actual results may differ materially from the results discussed in these forward-looking statements. Factors that might cause such a difference include those discussed in "Risk Factors" and elsewhere in the prospectus.

OVERVIEW

Since inception, we have been devoted primarily to the development of high content screening products consisting of instrumentation, fluorescence-based reagents and cellular analysis products, data and information management software and cellular bioinformatics. We are producing technologies and products that are designed to extend the power of genomics by defining the cellular functions of genes and proteins. Our initial commercialization focus is the pharmaceutical and biotechnology industries. To fund in part our product development, we entered into collaboration agreements with Johnson & Johnson, Merck & Co. and Warner-Lambert. Under these agreements, we received funding for the development of prototype instrumentation and cellular analysis products for initial testing. To date, our revenues have been principally derived from these collaboration agreements and from grants. In November 1999, we sold our first commercial products, the ArrayScan II and Cellomics Store. We are now selling these products as well as our HitKits, custom cellular analysis product development contracts and we expect to generate additional revenue from the release of new products.

Since our inception, we have incurred losses each year. Through December 31, 1999, we had an accumulated deficit of approximately $17.1 million. Our losses have resulted principally from costs incurred in research and development, and from selling, general and administrative costs associated with our operations. We expect to make significant expenditures in further commercializing our products and in the research and development of future products. Therefore, we expect to incur additional operating losses over at least the next several years as we continue to commercialize our products and fund future research and development expenses.

RESULTS OF OPERATIONS

YEARS ENDED DECEMBER 31, 1999 AND 1998

Revenues. We recognize revenues from product sales upon shipment of the product to the customer. We recognize development and collaboration agreement and grant revenues on a straight-line basis over the contract period or as work is performed. Where prototype instruments are delivered under collaboration agreements, we recognize revenues when the prototype is shipped to the customer. When payment for revenues under maintenance, support or cellular analysis product development contracts is received in advance of the services performed, we record deferred revenue related to these agreements. Revenues increased to $3.4 million for the year ended December 31, 1999 compared to $2.3 million for 1998. The increase was attributable to our sales of ArrayScan II and Cellomics Store products beginning in November 1999. In addition, we recognized increased revenues associated with a grant awarded in September 1998 by the Defense Advanced Research Project Agency, or DARPA, due to a full year of activity during 1999.

Costs of Product Sales. Costs of product sales consist primarily of labor and material costs. Costs of product sales were $405,000 for the year ended December 31, 1999 due to the sale of commercial products beginning in November 1999. There were no commercial product sales or costs related to product sales in 1998.

Research and Development Expenses. Research and development expenses consist primarily of salaries and related personnel costs, materials costs, amounts paid to consultants and contractors and other expenses related to the design, development, testing and enhancement of our products. We expense research and

22

development costs as they are incurred. Research and development expenses increased to $9.5 million for the year ended December 31, 1999 compared to $3.9 million for 1998. The increase was primarily attributable to increased costs associated with the development of prototype instrument products under a development and manufacturing agreement with Zeiss, hiring of additional personnel in product development and a full year of costs associated with the DARPA grant. We expect our research and development costs to increase over the next several years as we expand our research and development efforts.

Selling, General and Administrative Expenses. Selling, general and administrative expenses consist of salaries and related personnel costs for executive, sales, marketing, customer support, finance and other administrative personnel, marketing expenses, recruiting expenses, professional fees, facility costs, legal expenses associated with intellectual property and other corporate expenses including business development. Selling, general and administrative expenses increased to $3.9 million for the year ended December 31, 1999 compared to $1.8 million for 1998. The increase was attributable primarily to the hiring of senior management and sales personnel, marketing costs associated with the commercialization of our initial products and other general costs necessary to support the expansion of our business. We expect selling, general and administrative expenses to continue to increase over the next several years to support the commercialization of our products and our growing business activities.

Amortization of Deferred Compensation. Deferred compensation for options granted to employees represents the difference between the fair value of our common stock and the exercise price of the options at the date of grant. This amount is initially recorded as a reduction of stockholders' equity and is being amortized over the vesting period of the options, generally four years, using an accelerated method. We account for stock-based employee compensation arrangements in accordance with provisions of Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to Employees" ("APB 25") and comply with disclosure provisions of Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based Compensation" ("SFAS 123"). Deferred compensation for options granted to consultants has been determined in accordance with SFAS 123 as the fair value of the equity instruments issued. For the years ended December 31, 1998 and 1999, we recorded unamortized deferred stock compensation of $259,000 and $2.4 million, respectively. We amortized deferred compensation of $71,000 and $690,000 for the years ended December 31, 1998 and 1999, respectively. The amortization expense is included in the respective categories of expense in the statement of operations. At December 31, 1999, unamortized deferred stock compensation was $1.9 million. For options granted during the first quarter of 2000, we have recorded additional unamortized deferred compensation of $6.5 million for an unamortized total of $8.4 million. We expect to amortize deferred stock compensation of approximately $5.1 million in 2000, $2.1 million in 2001, $1.0 million in 2002 and $246,000 in 2003, relating to options granted in 1997, 1998, 1999 and through the first quarter of 2000. The amount of deferred compensation to be amortized in future periods may differ from these amounts if the unvested options for which deferred compensation has been recorded are subsequently cancelled or accelerated.

Interest Income (Expense), Net. Interest expense for the year ended December 31, 1999 increased to $302,000 from $44,000 in 1998, due primarily to additional borrowing under equipment financing lines of credit and a senior term note. Interest and other income for the year ended December 31, 1999 increased to $141,000 from $59,000 in 1998. The increase is due to higher average cash balances in 1999.

Provision for Income Taxes. We incurred net operating losses for the year ended December 31, 1998 and 1999 and consequently, we did not pay any federal, state or foreign income taxes. As of December 31, 1999, we had federal and state net operating loss carryforwards of approximately $15.5 million. We also had federal research and development tax credit carryforwards of approximately $725,000. If not fully utilized, the net operating losses and credit carryforwards will expire at various dates beginning in 2015 through 2019. If not fully utilized, the state of Pennsylvania net operating losses will expire at various dates beginning in 2005 through 2009. Utilization of net operating losses and credit carryforwards will be subject to an annual limitation due to the change in ownership provisions of the Internal Revenue Code of 1986 and similar state provisions. The annual limitation will likely result in the expiration of net operating losses and credits before utilization. Management believes that there is sufficient uncertainty regarding the realization of deferred tax assets such that a full valuation allowance is appropriate.

23

YEARS ENDED DECEMBER 31, 1998 AND 1997

Revenues. Revenues increased to $2.3 million for the year ended December 31, 1998 compared to $394,935 for 1997. The increase was primarily derived from revenues from collaboration agreements with Johnson & Johnson, Merck and Warner-Lambert and from work performed under the DARPA grant awarded to us in September 1998.

Research and Development Expenses. Research and development expenses totaled $3.9 million for the year ended December 31, 1998 compared to $1.5 million for 1997. The increase was primarily attributable to increased costs associated with the collaboration agreements as well as additional costs associated with the DARPA project.

Selling, General and Administrative Expenses. Selling, general and administrative expenses totaled $1.8 million for the year ended December 31, 1998 compared to $1.3 million for 1997. The increase was primarily due to increased personnel and facility costs to support our growth, increased legal expenses associated with intellectual property and increased corporate expenses associated with business development.

Amortization of Deferred Compensation. We recorded deferred compensation of $259,344 and amortization of deferred compensation of $71,242 for the year ended December 31, 1998. For the year ended December 31, 1997, we recorded no deferred compensation or amortization of deferred compensation. Amortization of deferred compensation is included in the respective categories of expense in the statement of operations.

Interest Income (Expense), Net. Interest expense for the year ended December 31, 1998 increased to $43,944 from $37,950 in 1997 due primarily to the interest expense associated with our equipment financing line of credit. Interest and other income for the year ended December 31, 1998 increased to $58,555 from $25,309 in 1997. The increase was due to higher average cash balances in 1998.

Provision for Income Taxes. We incurred net operating losses for the year ended December 31, 1998, and consequently we did not pay any federal, state or foreign income taxes. As of December 31, 1998, we had federal and state net operating loss carryforwards of $6.2 million. We also had federal research and development tax credit carryforwards of approximately $283,000.

LIQUIDITY AND CAPITAL RESOURCES

We have financed our operations from inception primarily from the sale of common and preferred stock, collaboration agreements and grants, equipment financing arrangements, a senior term loan and recently from revenues from initial product sales. Through December 31, 1999, we had received proceeds of $13.0 million from the issuances of equity securities and $6.4 million from product sales, collaboration agreements and grants. In addition, we received $5.1 million from debt financings.

As of December 31, 1999, we had cash and cash equivalents of $1.3 million and borrowing availability of $2.8 million under an equipment financing arrangement. Cash used in operating activities increased to $7.2 million for 1999 compared to $4.3 million in 1998. The increase was primarily due to increased losses associated with the expansion of the business partially offset by revenues from product sales and collaboration agreements and grants.

Capital expenditures for property and equipment were $205,421, $1.4 million and $1.1 million in 1997, 1998 and 1999, respectively. We expect to continue to make significant investments in the purchase of property and equipment to support our expanding operations.

We received $6.1 million and $9.2 million from financing activities in 1998 and 1999, respectively, which consisted principally of net proceeds of $10.2 million from the sale of preferred stock and $5.6 million from proceeds from debt financings. In September 1998, we entered into a $1.5 million non-revolving equipment financing line of credit. At December 31, 1999, we had borrowed approximately $1.5 million under the line of credit and, net of repayments, approximately $1.2 million was outstanding with interest rates at 12.7% to 12.9%. In June 1999, we entered into a $1.5 million senior term loan payable in thirty equal monthly installments commencing after a six-month interest-only period. The term loan is secured by our

24

assets including all of our intellectual property but excluding $5.0 million in equipment acquired under separate equipment financing facilities. Upon the closing of this offering, the liens on our intellectual property will be released. At December 31, 1999, $1.5 million was outstanding under the term loan at an interest rate of 12.5%. In July 1999, we entered into a $3.0 million non-revolving equipment financing facility. At December 31, 1999, we had borrowed approximately $227,000 under that facility with interest rates at 11.0% to 12.0%. As of December 31, 1999, we had approximately $52,000 in capitalized lease obligations outstanding.

On February 23, 2000, we issued Series B preferred stock for gross proceeds of $6.5 million. In addition, $1.8 million of demand notes, plus accrued interest, converted by their original terms and conditions into Series B preferred stock.

On February 3, 2000, we entered into a development, manufacturing and supply agreement with Zeiss which supersedes an agreement we entered into in April 1998. Additionally, we have capital expenditure commitments to Zeiss of $1.2 million during 2000. In connection with this agreement, we agreed to reimburse Zeiss for an additional $2.0 million for development costs incurred by Zeiss through December 31, 1999. These amounts are to be repaid during 2000 and 2001 in equal installments of $1.0 million.

Our capital requirements depend on numerous factors, including the status of our product development and commercialization efforts, the amount of proceeds actually raised in this offering, the amount of cash generated by our operations, competitive factors, sales and marketing activities, changes in, or termination of, existing licensing arrangements and our need for manufacturing capacity. We expect to devote substantial capital resources to continue our research and development efforts, to expand our support and product development activities and for other general corporate activities. We believe that the net proceeds of this offering, together with existing cash and marketable securities, borrowings under equipment financing arrangements and anticipated cash generated from product sales, will be sufficient to support our operations through 2001. We could require additional financing in the future which may not be available when needed or under favorable terms and conditions. Our failure to raise capital when needed may harm our business and operating results. To the extent that we raise additional capital by issuing equity securities, stockholders will experience dilution.

RECENT ACCOUNTING PRONOUNCEMENTS

In June 1998, the Financial Accounting Standards Board issued Statement No.
133 (SFAS 133), "Accounting for Derivative Instruments and Hedging Activities," which provides a comprehensive and consistent standard for the recognition and measurement of derivatives and hedging activities. Under the statement, every derivative is recorded in the balance sheet as either an asset or a liability measured at its fair value. The statement requires that changes in the fair value of a derivative be recognized currently in earnings unless specific hedge accounting criteria are met. SFAS 133 is effective for fiscal years beginning after June 15, 2000 and is not anticipated to have a material impact on our results of operations or financial condition.

DISCLOSURE ABOUT MARKET RISK

INTEREST RATE RISK

We currently maintain an investment portfolio of primarily money market investments and certificates of deposits with maturities of less than 90 days. The securities in our investment portfolio are not leveraged and, due to their short-term nature, are subject to minimal interest rate risk. Therefore, we currently do not hedge interest rate exposure. Due to the short term maturities of these investments, we do not believe that an increase in market rates would have any significant negative impact on the realized value of our investment portfolio. However, an increase in interest rates may negatively impact the interest expense on undrawn equipment financing.

25

FOREIGN CURRENCY RATE FLUCTUATIONS

Our commitments to Zeiss described above are denominated in Deutsche marks. Also, under our agreement with Zeiss, the ArrayScan Kinetics Workstation, ArrayScan Kinetics Reader and Zeiss' Ultra High Throughput Screening System will be sold to us at a transfer price denominated in Deutsche marks. This will create an exposure to foreign currency rate fluctuations. Any foreign currency revenues and expenses are translated using monthly average exchange rates prevailing during the year and any transaction gains and losses are included in net income. We may use hedging instruments including forward contracts to minimize any foreign currency rate fluctuation exposure. We cannot assure you that any hedging transaction will adequately protect us against currency rate fluctuations or that these transactions will not result in losses to us.

YEAR 2000 COMPLIANCE

The Year 2000 issue refers generally to the problems that some software may have in distinguishing whether "00" means 1900 or 2000 and the potential for the creation of erroneous data or systems failures which could disrupt normal business activities. Due to the fact that we are a relatively new company and have planned for Year 2000 effects, we have not incurred material expenses associated with Year 2000 compliance.

Many of our products contain our software or third party software programs. Our software programs were designed to be Year 2000 compliant and as of March 3, 2000, we have not experienced any material difficulties. Nevertheless, we do use and rely on a wide variety of information technologies, computer systems and scientific and manufacturing equipment containing computer-related components (such as programmable logic controllers and other embedded systems). As a result, time-sensitive functions of those software programs and equipment may yet misinterpret dates after January 1, 2000 to refer to the twentieth century rather than the twenty-first century. Although we do not anticipate any material problems, we could suffer system or equipment shutdowns, failures or miscalculations. Such conditions could result in inaccuracies in computer output or disruptions of operations, including, among other things, inaccurate processing of financial information and/or temporary inabilities to process transactions, manufacture products, or engage in similar normal business activities.

In addition, although all of our significant suppliers and our significant service providers indicated that they were or expected to be Year 2000 compliant by December 31, 1999, and although as of the date of this prospectus we are not aware of any material Year 2000 compliance problems with these third parties' systems, we cannot be certain that the representations of these third parties were accurate or that their systems are or will continue to be Year 2000 compliant. If any of our significant suppliers or significant service providers experience Year 2000 compliance problems and we are unable to replace them with alternate sources, our business would be harmed.

26

BUSINESS

OVERVIEW

We are a pioneer in the emerging field of cellomics. We believe that the field of cellomics will extend the recent advances in genomics and proteomics. We design our products to:

- measure the physical position and activity over time of cells and cellular components;

- extract information about cells, cellular components and their functions; and

- create new knowledge about cells and enable researchers to access a digital "virtual cell."

We are working to commercialize our product platform as an integrated solution to address the current bottlenecks in drug discovery. We believe that our products and technologies will provide the pharmaceutical and biotechnology industries with extensive information about cellular structure and function, in an automated fashion. Our products are intended to seamlessly link the generation of data, the extraction of information and the creation of knowledge of the workings of the cell. In addition to drug discovery, we believe our products are applicable to basic biomedical research, clinical diagnostics and agriculture.

INDUSTRY BACKGROUND

THE CELL

The cell is the fundamental unit of life and the building block of all living organisms. The components of cells, such as genes and proteins, do not independently reproduce themselves or respond to changes in their environment, and are not, themselves, alive. The cell is the most basic biological unit with these abilities. The adult human has trillions of cells of approximately 200 types, each with a different function, but all with similar structures and internal workings. Every cell contains a copy of an organism's genetic blueprint, as well as the machinery required to turn the blueprint into proteins. These proteins perform the majority of cellular functions. In addition to proteins, cells also contain a variety of other molecules that are also vital for cellular function.

The breakdown of normal cellular function as a result of abnormalities in genes and the expression of proteins causes all disease. Research aimed at understanding how cells work may lead to the development of new drugs or therapies addressing disease at the cellular level. In addition, this understanding may lead to advances in other areas of life sciences including basic biomedical research, diagnostics and agriculture markets. A detailed knowledge of the workings of the cell builds on our present understanding of genomics and proteomics.

GENOMICS AND PROTEOMICS

Genomics is the study of deoxyribonucleic acid, or DNA, and messenger ribonucleic acid, or mRNA, which are the biomolecules that contain and convey the information required for protein production and for all cellular functions. DNA contains the genetic blueprint of all organisms. The complete sequence of an organism's DNA is called the genome. Interest in understanding the relationships between genes and disease has generated a worldwide effort to identify and sequence genes, leading to the identification of new targets for drug discovery and gene therapy. The introduction of automated DNA sequencers and searchable DNA sequence databases helped to create the field of genomics.

Proteomics is the study of the structures, chemical modifications and functions of an organism's complete collection of proteins, the major targets for drug discovery. Proteins are the molecular machines of the cell that are responsible for performing the majority of cellular functions. The complete set of proteins within an organism is called the proteome. Interest in understanding the relationships between protein functions and disease has generated a global initiative to define the structure and function of every protein. This task is challenging because any given cell type expresses only ten to twenty percent of all genes. Furthermore, selected proteins are present only during a portion of the life cycle of a cell.

Both genomics and proteomics provide important components of understanding cellular function and disease, but they do not provide a complete understanding of cellular function. Understanding how different

27

genes and proteins act in tandem to perform functions at the cellular level is critical to improving productivity in drug discovery and other life sciences applications. Drugs affect target proteins involved in disease at the cellular level and novel therapies should be directed at this level.

THE EMERGING FIELD OF CELLOMICS

We define cellomics as the study of all the molecules comprising a cell, as well as their interactions in space and over time, that bring about cellular functions. The cellome is the complete collection of an organism's cells and cellular components, including genes and proteins. Unlike genomics and proteomics, cellomics seeks to develop a complete description of all the characteristics, actions and interactions of cellular components. We believe that more fully understanding cellular function through cellomics will enable the more efficient, productive and cost-effective discovery and development of novel drugs and therapies, and improve the diagnosis and management of disease. We believe that the introduction of automated cell analysis instruments and searchable cellular databases may lead to the creation of the field of cellomics. The following diagram illustrates the cell as a functional machine which includes a number of components that are responsible for performing cellular functions:

THE GENE-TO-CELL CONTINUUM

[GRAPHIC SHOWING HOW DNA, RNA AND PROTEINS ARE PART OF THE CELLULAR FUNCTIONAL MACHINE]

THE CURRENT DRUG DISCOVERY PROCESS AND ITS LIMITATIONS

Drug development has historically been fueled by growing research and development investments by the pharmaceutical and biotechnology industries. Drug discovery and development is an expensive, time-consuming and risky process. The Pharmaceutical Research and Manufacturing Association estimates that pharmaceutical companies spent approximately $24 billion, or 20% of sales, in research and development during 1999. This represented a 14.1% increase from 1998. Of the potentially hundreds of thousands of compounds screened in a drug discovery program, less than 1 in 1,000 will become new drug candidates and only about 20% of these will complete human clinical trials and receive regulatory approval. Only about 30% of drugs that are commercialized ever recover their development costs. Pharmaceutical and biotechnology companies have realized that, to stay competitive and meet their goals for growth, they will have to significantly increase the number of new drugs introduced each year. Because government agencies rigidly define and highly regulate the pre-clinical and clinical trial phases of the development of new drugs, companies can impose little control over the costs of these phases. As a result, drug companies increasingly focus their efforts on the drug discovery stage to enhance productivity and reduce costs.

The drug discovery process is comprised of four steps: target identification, target validation, primary screening and lead optimization.

- Target identification characterizes the role a particular protein plays in cellular function in order to determine whether it might be a target for drug discovery. While target identification has historically

28

been a bottleneck in drug discovery, this step has been minimized by the dramatic increase in gene discovery, largely due to the emergence of genomics technology.

- Target validation demonstrates that affecting the function of a particular target has a potential effect on the course of a disease. Traditional target validation depends primarily upon manual, benchtop biological research, which is expensive and slow. Target validation has not kept pace with increased productivity in target identification.

- Primary screening tests a large collection of chemical compounds, or libraries, against validated targets to find "hits" or members of the library that affect the function of a particular target. During primary screening, hundreds of thousands of compounds may be screened for a single, simple measure of a target's biological activity. Over the last decade, automated high throughput and ultra high throughput screening systems have been introduced. These systems are capable of performing over 100,000 cellular analyses per day.

- Lead optimization is the process of sorting through hits that emerge from primary screening to find compounds likely to have appropriate drug properties, including efficacy and low toxicity. Because of the improved efficiency in primary screening, lead optimization is now the major bottleneck in the drug discovery process. Traditionally, lead optimization has been based on manual, benchtop biological research that includes secondary screens, studies of the relationship between the structure and activity of compounds and cellular toxicity measurements. This slow and expensive process usually employs single measurements of biological activity without capturing both time and space data from cells. Time and space data, which we call high content data, is important to the understanding of complex cell functions. Without cellular analysis systems which provide high content data on cell functions, the pharmaceutical and biotechnology industries have historically been focused on a narrow range of targets, primarily the receptors on the surface of cells. However, cell functions involve not only the number and distribution of specific receptors localized on the surface of cells, but also the distribution and activity of other molecules on and within the cells. For example, the cycle of internalization of receptors to the inside of cells and back to the surface that regulates the responsiveness of many cells, involves numerous proteins in different locations within cells and exhibits different activities. The ability to measure the time and space activities of these proteins in relationship to specific cell functions, such as receptor-based stimulation, is an important challenge for lead optimization.

Pharmaceutical and biotechnology companies strive to improve productivity in all four steps of the drug discovery process. To date, substantial improvements have been made at the target identification and the primary screening steps through significant investments in genomics and high throughput screening technologies. We believe that the key to relieving the bottleneck at the lead optimization step will be the development of products and technologies that produce high content data, information and ultimately knowledge of cellular functions. We also believe that the application of cellomics will make target validation more efficient. In addition, we believe that the large amount of time and space data that will be produced in high content, cell-based measurements will require automation of the process from the level of instrumentation, management and mining of data, to the identification of lead compounds based on knowledge of the role of targets in cellular functions.

OUR SOLUTION

We are pioneering an approach to the field of cellomics in an effort to increase the productivity of the drug discovery process. We believe our products will allow researchers to narrow the focus of their discovery effort to more accurately identify and select compounds that have a higher chance of successfully completing the drug development process. Our solution involves the following elements:

Create High Content Screening Technologies and Products. We have developed a high content screening technology that consists of instrumentation, fluorescent dyes and biological molecules that we call reagents, protocols, and data and information management software. Together, this integrated platform provides high content biological information about time, space and activity of cells and cellular components, as it relates to

29

a drug candidate's physiological impact on specific cellular targets within, on and between cells. We are designing our high content screening platform to provide insights into the potential efficacy and toxicity of a drug candidate on cells prior to initiating expensive pre-clinical testing and human clinical trials, in order to enable pharmaceutical companies to increase productivity. We believe that we are the first company to develop and deliver high content screening products to the pharmaceutical industry. We have developed a high content screen that measures the internalization of specific receptors from the surface of the cell and defines their dynamic re-distribution within the cell, including their return to the cell surface. We believe our products and technologies will enable our customers to define the specific role that proteins play in cell functions such as receptor cycling. Furthermore, we believe our high content screening platform has broad applications across many segments of the life sciences industry.

We believe the use of high content screening during lead optimization will significantly enhance the process of further qualifying hits resulting from high throughput screening. High throughput screening products for cell-based analysis presently used in the primary screening step of drug discovery cannot produce time and space activity information required for high content screening. Our high content screening products directly measure the time and space activity of fluorescently-labeled targets and other cellular components on, in and even between cells.

Automate High Content Screening. We designed our high content screening products and technologies to automate the instrumentation, cellular analysis tools and information management tools required to analyze cells. Just as the proliferation of automated DNA sequencing instruments led to a dramatic increase in the generation of vast amounts of genomic data and information, we believe that automation of high content screening systems will lead to a dramatic increase in cell-based data and information, thereby improving the productivity of the drug discovery process. Until now, most cell analysis methods used manual experimentation that did not keep pace with the automation of primary screening. In addition, due to the large volume of data generated in high throughput screening and high content screening, we believe it is essential to use an automated system to identify the compounds that have the most desirable effects on targets within cells. We designed our products to automatically link together all of the results from the discovery process with the compounds, biological targets and cellular processes that are part of the screen. We believe this enables all of the higher level linkages to chemical informatics systems and bioinformatics tools that will permit the creation of new knowledge.

Access, Manage and Mine Data for Decision Support. We are developing software tools and products to archive data from high content screens, perform data analysis, manage large numbers of measurements in the total screening process and perform data mining on large data sets. We believe the life sciences industry's most pressing issues include the effective management and use of the volume of data being generated. In addition, to fully exploit the potential of our high content screening systems, researchers need innovative informatics tools to manage, analyze and mine the large volume of data being generated. We are designing our informatics products to provide an integrated informatics solution. To this end, our product design will offer a user-friendly, web-based environment built on top of industry standard database tools, together with data and pattern analysis tools and open interfaces for easy data exchange. In addition, our informatics products are designed to take advantage of a web browser-based interface that enables seamless access and integration of proprietary and public domain databases, including genomics, proteomics and the Cellomics Knowledgebase. We believe our informatics tools provide a platform for developing a more effective understanding of the cell, and increasing productivity in the drug discovery process.

Create a Database which Leads to a Better Understanding of the Cellome. We are developing a searchable database of the molecular components and their interactions that occur in the cell. We are developing the Cellomics Knowledgebase, our proprietary, web-based, searchable database of the biochemical and molecular interactions that produce normal and abnormal cell functions. Our Cellomics Knowledgebase will consist of a densely populated database of public domain "prior knowledge" in cell biology that can be abstracted using our proprietary search software, and proprietary knowledge generated from our high content screening systems.

We are working to create a digital virtual cell through the integration of the Cellomics Knowledgebase with the continuum of our data-generating and information-extracting products. We believe the Cellomics

30

Knowledgebase can become a powerful predictive tool to permit better decisions on what targets to screen, what cell functions to measure and what types of chemical compounds to screen, as well as define potentially new cellular pathways.

STRATEGY

Our mission is to be a leader in the field of cellomics in order to extend the power of genomics and proteomics by defining the cellular functions of genes and proteins. Our strategy involves developing and commercializing products designed to make life sciences research, including drug discovery, more productive and cost-effective. Key elements of our strategy are as follows:

Establish High Content Screening as the Standard for Drug Discovery. We currently market our high content screening systems primarily to the pharmaceutical and biotechnology industries. Our strategy is to make high content screening an important tool for drug discovery by penetrating pharmaceutical, biotechnology and other research laboratories engaged in drug discovery. We have designed our instruments, cellular analysis products and informatics products to meet the immediate needs and current standards of this market segment. We believe this segment provides the most immediate opportunity due to the large investment in research and development and the need to improve the productivity of drug discovery.

Broaden Our Cellular Analysis Products Menu. We are developing a series of new classes of the consumable reagents and software tools used in high content screening. The consumable reagents are sold in kits called reagent kits and consist of a combination of fluorescent dyes that specifically bond to cellular components and biological molecules that have fluorescent dyes attached by a variety of methods. These molecules permit the proteins and other cellular components to be detected and measured by the screening instrumentation. We design software tools for the different types of cellular analysis. Each major cellular process will require a new class of cellular analysis products including its own software tool and will utilize multiple reagent kits. For example, the receptor internalization class of cellular analysis products includes many different types of receptors, each requiring their own kit. We believe there are dozens of classes of cellular analysis products each requiring multiple reagent kits that have the potential to generate follow-on sales.

Expand into New Market Segments. We intend to use our proprietary cellular analysis products to expand high content screening into multiple markets. These markets include target validation in drug discovery, basic biomedical research, clinical diagnostics and agriculture. We also intend to use our high content screening platform to study the physiological impact of drugs on cells collected, or derived, from humans with individual genetic make-ups. In addition, we believe this approach, which we call PharmacoCellomics Profiling, will allow for pre-testing the response of a patient's cells to an accepted protocol or drug candidate, and better focus clinical trials on the optimal population of patients.

Migrate to the CellChip System. We are currently developing the CellChip System. We believe the CellChip System is a revolutionary platform, incorporating the precision of high content screening into a miniaturized, more versatile product. We are designing the CellChip System to increase the productivity of the drug discovery process by combining high throughput screening and high content screening onto the same miniaturized platform. We believe that our CellChip System will permit pre-packaged, complex cellular analysis to be performed simply, quickly and at less cost per measurement than presently performed using microplates and will accelerate the use of cell-based measurements in all fields of life sciences.

Create the Leading Searchable Repository of Cellomics Knowledge. We are striving to create the leading searchable repository of knowledge of the cellome by populating our Cellomics Knowledgebase with high content screening information and information obtained from the public domain. We intend to continually edit and refine our Cellomics Knowledgebase through reviews by a panel of scientists in the field of cell biology. We believe our Cellomics Knowledgebase may add significant value to researchers' understanding of the cellome, thereby increasing the productivity of the drug discovery process. We intend to commercialize the Cellomics Knowledgebase through the sale of subscriptions.

31

Combine Our Strengths with the Strengths of Strategic Corporate Partners. We intend to continue to enter into strategic partnerships to combine our core expertise in cell and molecular biology, imaging science, information management software, cellular bioinformatics and cell patterning, with the strengths of corporate partners. Through these collaborations, we intend to access complementary technologies and strengthen our commercialization capabilities. We believe that strategic relationships with partners who have strong, existing market positions and development track records will speed market introduction, maintain high barriers to entry and reduce our research and development risk and capital outlay. For example, we have established a strategic relationship with Zeiss relating to our ArrayScan products and Zeiss' Ultra High Throughput Screening System. In addition, we have entered into a collaboration with ACLARA to incorporate their technologies for the control of very small fluid volumes into our CellChip System. We also have exclusively licensed some key fluorescence technologies from Molecular Probes to incorporate into our reagent kits for the high content screening market.

OUR PRODUCTS

Our products initially target a market segment consisting of approximately 140 pharmaceutical companies which are involved in discovery research and development. The pharmaceutical industry spent approximately $24 billion in research and development in 1999. Within this initial market segment we are focusing on screening and toxicology where the pharmaceutical industry spent approximately $1.5 billion in 1999 and information management and bioinformatics tools where the pharmaceutical industry spent approximately $800 million in 1999. We believe our products have potential application in other life sciences markets. Our products are designed to seamlessly integrate the generation of data to the extraction of information, and ultimately create cellular knowledge. We generate cellular data using our proprietary instruments and cellular analysis products, including software tools and reagent kits. The data generated is then stored, managed, analyzed and mined using our proprietary informatics products. Our cellular bioinformatics products, coupled with internally and externally generated information, are designed to build a virtual cell which maps the complex network of cellular components and their interactions. Our knowledge products aim to systematize, in a searchable, electronic format, our continuously evolving understanding of cellular biology. Our existing products and our products in development are highlighted on the following page.

HIGH CONTENT SCREENING PRODUCTS TO GENERATE DATA

ArrayScan II. The ArrayScan II is an automated, high content screening instrument comprised of optics, automation hardware and software that scans standard microplates and analyzes fields of cells based on multi-color fluorescence imaging. Our ArrayScan II analyzes drug candidate interactions within, on and between cells with multi-color fluorescence measurements taken at a single point in time. The system contains microplate scanning hardware, fluorescence excitation and emission optics, a solid state camera, a Pentium- based PC with powerful software-based analyses, a plate stacker for automated screens and database management capabilities. The system can control the temperature, humidity and other environmental parameters for simple live cell experimental analysis. We offer a number of versions of the ArrayScan II which have different software tools for various levels of analysis.

ArrayScan Kinetics Workstation. We are developing our ArrayScan Kinetics Workstation to allow researchers to perform complete, automated high content screening on multiple plates of living cells. We have a working version of our ArrayScan Kinetics Workstation that is undergoing pre-product testing. The ArrayScan Kinetics Workstation is designed to operate under controlled growth conditions with random access compound delivery where time, or kinetic, information is critical. Random access compound delivery enables researchers to test the effects of drug candidates in cells at multiple points in time and under various growth conditions to assess interaction between drugs and cells or cell components, which may be useful in understanding toxicity and efficacy. This proprietary workstation includes many of the features of the ArrayScan II, as well as an advanced plate reader, 30-plate incubator stacker, on-board fluid addition, compound storage, and automatic plate handling. Zeiss manufactures our ArrayScan Kinetics Workstation to our specifications under the terms of our collaboration. The ArrayScan Kinetics Workstation is designed to operate as a standalone screening workstation or in connection with Zeiss' Ultra High Throughput Screening System.

32

OUR PRODUCTS AND PRODUCTS IN DEVELOPMENT

   PRODUCT CATEGORIES               PRODUCT                          DESCRIPTION                  STATUS(1)
------------------------  ----------------------------  --------------------------------------  --------------
HIGH CONTENT SCREENING    ArrayScan II                  Automated, high content screening       Commercialized
PRODUCTS TO GENERATE                                    instrument and software for single
DATA                                                    point-in- time cellular analysis
                          ArrayScan Kinetics            Automated, fully integrated high        In development
                          Workstation                   content screening system with reader,   (Pre-product
                                                        fluid addition station, and             testing)
                                                        environmental control for multiple
                                                        point-in-time analyses
                          ArrayScan Kinetics Reader     Automated high content screening        In development
                                                        instrument and software designed for    (Pre-product
                                                        use with existing high throughput       testing)
                                                        screening automation systems, to allow
                                                        them to perform multiple point-in-time
                                                        analyses
                          Software Tools and HitKit     Software tools and reagent kits         Commercialized
                          Reagents                      optimized for high content screening    12 kits;
                                                        on our ArrayScan systems                others in
                                                                                                development
                          Custom Cellular Analysis      Cellular analysis development services  Commercialized
                          Development                   for customers
                          CellChip System               Miniaturized cell analysis platform     In development
                                                        utilizing small volume fluid control    (Proof of
                                                        technology in collaboration with        concept of
                                                        ACLARA                                  whole system;
                                                                                                Prototype of
                                                                                                microscopic
                                                                                                cell grids and
                                                                                                fluid control
                                                                                                technologies)

INFORMATICS PRODUCTS TO   Cellomics Store               Data management software for managing,  Commercialized
EXTRACT INFORMATION                                     archiving and viewing massive volumes
                                                        of cell data
                          Cellomics Screen              Process management and data analysis    In development
                                                        software intended to allow hits and     (Pre-product
                                                        leads to be easily identified and       testing)
                                                        verified
                          Cellomics Discover            Data visualization and mining software  In development
                                                        incorporating a web browser-based       (Prototype
                                                        interface and seamless drill-down to    products)
                                                        examine data in Cellomics Screen and
                                                        Cellomics Store, as well as retrieve
                                                        data from both proprietary and public
                                                        databases

CELLULAR BIOINFORMATICS   Cellomics Knowledgebase       Web-based, searchable database of       In development
PRODUCTS TO CREATE                                      cellular biochemical and molecular      (Proof of
KNOWLEDGE                                               interactions designed to create a       concept)
                                                        digital virtual cell
                          PharmacoCellomics Profiling   Searchable database that contains       In development
                                                        individual patient's cell responses to  (Proof of
                                                        lead compounds and complements          concept)
                                                        genomics to personalize drug discovery

(1) Products in development are defined in four stages: (a) the planning stage -- where concept of product is defined; (b) proof of concept -- which involves testing components of prototypes successfully; (c) prototype products -- partially functional system tested against performance specifications and; (d) pre-product testing -- the testing of pre-product to finalize performance specifications before commercialization.

33

ArrayScan Kinetics Reader. We have designed our ArrayScan Kinetics Reader to allow researchers to integrate our high content screening system into the existing installed base of high throughput screening systems. We have working prototypes of our ArrayScan Kinetics Reader that are undergoing pre-product testing. Our ArrayScan Kinetics Reader includes proprietary optics, hardware, environmental controls and software that have been optimized for kinetic measurements. As part of our collaboration with Zeiss, Zeiss manufactures our ArrayScan Kinetics Reader according to our specifications.

Software Tools and HitKit Reagents. We have a growing list of proprietary classes of cellular analysis products, including software tools and reagent kits optimized for our ArrayScan systems. We presently have commercialized 12 reagent kits. Our cellular analysis products are designed to be used to monitor drug effects in a variety of diseases such as cancer, diabetes and infectious disease, as well as toxicity testing at the cellular level. The process of developing a new cellular analysis product includes the selection of cell types, targets, fluorescence-based reagents, protocols and software programs. The complete kit incorporates the necessary reagents and protocols to run the analysis. We are developing new Software tools for the new classes of cellular analysis products being developed. We anticipate selling the Software tools as software plug-ins to our ArrayScan systems.

Our reagent kits, which we call HitKits, include combinations of cells, multi-color fluorescence-based reagents and other consumables such as validated microplates, in order to understand a drug candidate's effect on a cell. Our first commercialized HitKits are designed to measure transcription factor activation, cell viability, receptor internalization, apoptosis, or cell death, and cytotoxicity, or the toxic effect on cells. We are expanding our commercialized list of cellular analysis products.

Custom Cellular Analysis Development. We provide screen development services on a contractual basis to support customers in the design, development and implementation of high content screening cellular analysis tools that are not already offered as finished HitKits and software tools. We offer custom cellular analysis tools through screen development support services, including the development of specific fluorescence-based reagents, software tools for analysis, and sample preparation and screening protocols.

CellChip System. We are developing our CellChip System as a miniaturized, next-generation platform for combining high content screening and high throughput screening. Our CellChip System combines the organization of specific cells in very small grids of cells, with technologies which control very small fluid volumes. We believe our CellChip System will represent a significant advance over the industry standard microplates. We are collaborating with ACLARA to develop our CellChip System by incorporating their small volume fluid control technologies. Our CellChip System utilizes small wafers of glass or plastic that are patterned with chemical and molecular domains which organize specific cells in microscopic grids. Our CellChip System is being designed to permit more rapid, sophisticated and cost-effective cell analyses than presently permitted by the current microplate format.

INFORMATICS PRODUCTS TO EXTRACT INFORMATION

Cellomics Store. We currently market Cellomics Store, a software package that manages and archives the large volume of cell data and images that can be generated during screening. Cellomics Store allows for the visualization of biologically rich data generated from our ArrayScan instrument line, as well as existing high throughput screening instruments.

Cellomics Screen. We are developing Cellomics Screen, a software package designed to manage the screening process and data analysis. Cellomics Screen analyzes screening runs, allowing hits and leads to be easily identified and verified. We are currently in pre-product testing of this product.

Cellomics Discover. We are developing Cellomics Discover, a software package that includes a web browser-based interface. We have designed Cellomics Discover to provide data visualization and mining capabilities, and information retrieval from both proprietary and public databases. We have also designed Cellomics Discover to provide seamless drill-down to examine data in Cellomics Screen and Cellomics Store. Cellomics Discover will also automate quality assessment of screening data, and correlate high content

34

screening and high throughput screening data with data from other databases such as genomics, proteomics and our Cellomics Knowledgebase. We are currently working with a prototype product.

CELLULAR BIOINFORMATICS PRODUCTS TO CREATE KNOWLEDGE

Cellomics Knowledgebase. We are developing our Cellomics Knowledgebase as a web browser-based product designed to facilitate the discovery of cellular knowledge about new targets, the interaction of targets within cellular pathways and cellular functions. Our Cellomics Knowledgebase is intended to be for the cell, what searchable genomics databases have been with respect to the discovery of new genes from DNA sequences. The core of the Cellomics Knowledgebase will consist of a biochemical and molecular wiring diagram of cells, which is the complex, interactive network of cellular components. We believe queries of the Cellomics Knowledgebase will allow new knowledge to be discovered concerning molecular interactions, pathway connections, cell functions and relationships among cell components across cell types and species. The complex results of queries could be displayed using a virtual cell visualization tool under development. In addition, we believe that proprietary databases derived from the Cellomics Knowledgebase could contain profiling information on the impact of classes of compounds on targets, pathways, cell functions and cytotoxicity. We also intend the Cellomics Knowledgebase to integrate information from genomics, proteomics and gene expression profiles. We are designing the first volume of the Cellomics Knowledgebase to organize around human cell types, but be expandable and searchable across species, cell functions, cell pathways and specific proteins and other cellular components. The design of the Cellomics Knowledgebase should systematize, in a searchable, electronic format, our continuously evolving understanding of cellular biology, encompassing not only cellular components, but also their complex interactions and interdependencies.

PharmacoCellomics Profiling. We are developing a searchable database that will combine our high content screening products, informatics software and Cellomics Knowledgebase, to create a total platform to profile cells of specific patients. PharmacoCellomics complements genomics profiling, which is the profiling of the human population to define genetic subsets of the population that would be likely candidates for specific drugs. Our PharmacoCellomics product will contain an individual patient's cell responses to lead compounds, which we believe will significantly increase the potential of personalizing drug discovery. We are initially exploring cancer, where patient tumor cells can be accessed and used in high content screening to define the effect of experimental compounds.

PRODUCTS WE MARKET FOR ZEISS

As part of our strategic relationship with Zeiss, we have entered into an agreement to sell and market their Ultra High Throughput Screening System in North America. Zeiss' Ultra High Throughput Screening System is a fully automated platform capable of screening over 100,000 compounds per day in the primary screening step of drug discovery. The system optimizes all process steps using advanced technologies for optical detection and automation to achieve high speed, flexibility and reliability. The system is modular and can be rapidly reconfigured for distinct types of screens. Our ArrayScan Kinetics Workstation could be directly coupled to Zeiss' system to shorten the drug discovery process by running primary cell-based screens and lead optimization screens in series.

SALES AND MARKETING

We sell our products to pharmaceutical and biotechnology companies. We believe our products are applicable to a broader range of life sciences markets. We sell our products in North America and Europe through a direct sales force experienced in selling capital equipment, reagents and development contracts to the pharmaceutical, biotechnology and other life sciences markets. The pre-sale and post-sale processes are supported by an executive business development team and a scientific and applications support staff. In addition, we sell access to our future products through technology access programs. We provide our customers with a standard one year replacement warranty on our products. Our standard payment terms for our products are 30 days from date of shipment.

35

In addition to our own products, we provide exclusive marketing, sales, service and support for Zeiss' Ultra High Throughput Screening System in North America. Under this agreement, Zeiss ships directly its Ultra High Throughput Screening System to our customers in North America thereby limiting the amount of inventory required by us. Zeiss also provides standard industry warranties of one year to replace parts. Our standard payment terms are 30 days from date of shipment.

We identify potential customers through a comprehensive marketing program, coupled with personal lead development by our field sales force, executive management and scientists, as well as our scientific advisors. Led by an experienced marketing and product management staff, our marketing program includes direct mail programs, advertisements in market-specific journals, production of detailed product and technology literature, trade show exhibits, speaking engagements at scientific meetings, seminars, public relations and internet-based website marketing.

CORPORATE COLLABORATIONS AND TECHNOLOGY ACCESS PROGRAMS

We rely on Zeiss for optical components for our ArrayScan II and on Molecular Probes for reagent supplies that are used in our cellular analysis kits. We expect to rely on ACLARA for some of the technologies to be used in our CellChip Systems.

Carl Zeiss Jena, GmbH. In April 1998, we formed a collaboration with Zeiss, one of our early stockholders, relating to the development, manufacture and supply of the ArrayScan Kinetics Reader and the ArrayScan Kinetics Workstation. In February 2000, we entered into two new agreements with Zeiss that amend and restate our 1998 agreement. These agreements are a development, manufacturing and supply agreement and a sales and marketing agreement.

Under the new development, manufacturing and supply agreement, Zeiss is responsible for the exclusive manufacture of our ArrayScan Kinetics Workstation and ArrayScan Kinetics Reader. Under the terms of our agreement, Zeiss will manufacture these products to our specifications. The arrangement also provides that both we and Zeiss cooperatively develop software interfaces designed to make Zeiss' Ultra High Throughput Screening System compatible with our data analysis and management software. Under the terms of the agreement, we are responsible for marketing, selling and servicing our products. The agreement sets forth the prices we will pay Zeiss for products they manufacture subject to renegotiation every two years. Under the agreement, we are the owner of all intellectual property of components specifically developed and manufactured for the ArrayScan products. In consideration for our agreement to purchase such products from Zeiss, Zeiss is prohibited from incorporating such technology into competing products. The agreement expires in January 2005, subject to early termination by either party after January 2002. In connection with entering into the February 2000 agreement, we agreed to reimburse Zeiss for $2.0 million development costs incurred through December 1999. We have agreed to pay Zeiss the development costs under the terms of the February 2000 agreement during 2000 and 2001 in equal installments of $1.0 million. In addition, the increase in our research and development expenses for the year ended December 31, 1999 from $3.9 million in 1998 to $9.5 million was primarily attributable to increased costs associated with the development of prototype instrument products under this agreement.

Under the terms of our sales and marketing agreement with Zeiss, we are responsible for the exclusive sale and marketing of Zeiss' Ultra High Throughput Screening System and related products in North America. We are also responsible for providing shipping, installation and other support activities, at our expense, for products sold in North America. During the term of the agreement, we may not sell in North America any products that compete with Zeiss' Ultra High Throughput Screening System or other related products developed by Zeiss. In the event that we do not comply with this provision of the agreement, Zeiss is entitled to terminate our exclusivity immediately. Under the terms of the agreement, we have agreed to purchase a minimum number of Zeiss products pursuant to the terms of the agreement. If we do not fulfill our requirements specified in the agreement, Zeiss has the right to either terminate our exclusivity or terminate the agreement in its entirety. We are free, under the terms of the agreement, to sell the Zeiss products in North America at a sales price we establish. We will retain all revenues from our sales of Zeiss' products in North America. The agreement expires in December 2005; however, either party may terminate

36

the agreement on the occurrence of material breach by the other party or if the other party comes under control of a competitor of the terminating party.

ACLARA Biosciences, Inc. In October 1999, we entered into an exclusive collaboration with ACLARA for the development of our CellChip System utilizing our cell patterning technologies and ACLARA's proprietary technology for controlling very small volumes of fluids. Each of us will own all intellectual property in which we had the sole role in inventing, and will jointly own all intellectual property which was co-invented by both of us. During the term of the agreement, we may not seek another partner for small volume fluid control technologies, and ACLARA may not partner with another entity for technology to organize specific cells into very small grids using its small volume fluid control technologies. We have established proprietary development budgets with ACLARA for the first year of the agreement and have agreed to develop budgets for succeeding years in good faith. In the event that we receive revenues from early access programs or commercialization of our products, we will enter into good-faith negotiations to determine division of those revenues. In the event the CellChip System is commercialized, we are responsible for manufacturing commercialized CellChip Systems. Further, ACLARA has agreed to enter into a supply agreement in the event the CellChip System is ultimately commercialized. Either party may terminate this agreement on the material breach of the other party. Under some circumstances, licenses that were granted between the parties during the term of the agreement may survive any termination of the agreement. Further, each party has the right to license from the other party additional technology related to the CellChip if requested within two years of termination.

Molecular Probes, Inc. In April 1999, we entered into a license and supply agreement with Molecular Probes under which it licensed to us select proprietary fluorescence-based reagents on an exclusive worldwide basis for use in high content screening. We also obtained a non-exclusive worldwide license to sell these proprietary fluorescence-based reagents for use in ultra high throughput screening. Under the terms of the agreement, we are required to meet certain conditions to maintain exclusivity. We will also purchase all of our requirements for particular fluorescence-based reagents for use in high content screening and ultra high throughput screening from Molecular Probes, unless Molecular Probes is unable to meet our requirements. We paid Molecular Probes an up-front license fee of $90,000 and agreed to pay continuing royalties based on specified annual sales revenues.

Pharmaceutical Company Collaborations. We enter into technology access programs through which we give customers early access to our new products, along with technical support, training and individualized services. Through our technology access programs, we collaborate with our customers during the product development process in order to create products that closely meet the needs of the market. Our technology access programs assist us in focusing our technology and development efforts on areas that we believe will have the most impact on the market. To date, Johnson & Johnson, Merck and Warner-Lambert have participated in our technology access programs. Typically, for the term of a technology access agreement, our customers will have non-exclusive or limited-time exclusive access to particular products in development.

We have received approximately $1.8 million to date and expect to receive an additional $300,000 from the collaborators above related to the achievement of milestones, research and development funding and license fees. We have also paid approximately $244,000 to date and we are committed to pay approximately $3.6 million to the collaborators above relating to capital expenditure, the achievement of milestones, research and development funding and license fees.

MANUFACTURING

We currently maintain a manufacturing facility for instrumentation, software products, and reagent kit production. Our manufacturing of the ArrayScan II predominantly involves a final assembly and testing activity using commercially available optical, mechanical and computer components combined with custom mounting assemblies and proprietary software. The ArrayScan Kinetics Workstation and ArrayScan Kinetics Reader manufacturing will involve software integration and testing of the electromechanical and optical system manufactured for us by Zeiss. We manufacture HitKits in our facility with a combination of our proprietary reagents and those we have exclusively licensed from Molecular Probes. We dispense, finish and

37

test our products on site using our processes and to our specifications. Similarly, we manufacture our informatics and bioinformatics software products using industry standard procedures.

COMPETITION

The biotechnology and pharmaceutical industries are characterized by rapidly evolving technology and intense competition. Currently, we compete with many companies, including major pharmaceutical, chemical and biotechnology companies that perform drug discovery and development and related tasks using alternative technologies. We have begun to encounter competition from companies which offer one or more components of high content screening, including integrated reagents, kits, applications, instrumentation and informatics. We expect to encounter intense competition from companies providing conventional drug discovery and development products based on established technologies and companies developing their own cellular analysis technologies.

In order to compete against vendors of conventional products, we will need to demonstrate the advantages of our products and technologies over well-established alternative products and technologies. Moreover, we will need to demonstrate the potential economic value of our products relative to these conventional technologies and products. We will also need to compete effectively with companies developing their own cellular analysis technologies and products. Our future success will depend in large part on our ability to establish and maintain a competitive position in these and future technologies which we may not be able to do. Rapid technological development may result in our products or technologies becoming obsolete. Products offered by us could be made obsolete either by less expensive or more effective products based on similar or other technologies.

Many of our competitors have or will have greater corporate, financial, operational, sales and marketing resources, and more experience in research and development than we have. Moreover, competitors may have greater name recognition than we do, and may offer discounts as a competitive tactic. We cannot assure you that our competitors will not succeed in developing or marketing technologies or products that are more effective or commercially attractive than our products or that would render our technologies and products obsolete. Also, we may not have the financial resources, technical expertise or marketing, distribution or support capabilities to compete successfully in the future. Our success will depend in large part on our ability to maintain a competitive position with our technologies.

Our competitive position also depends on our ability to:

- attract and retain qualified personnel;

- obtain patent protection or otherwise develop proprietary products or processes;

- discover new technologies that improve the productivity of the drug discovery process; and

- secure sufficient capital resources to complete product development and commercialization processes.

INTELLECTUAL PROPERTY RIGHTS

We seek patent protection on cell-based screening analysis tools and kits, cell array technologies, reagents, instrumentation, informatics technologies and bioinformatics. We currently own one issued U.S. patent and one allowed U.S. patent, and have over 40 U.S. patent applications pending, of which over 30 are provisional patent applications. In addition, we have patents pending in other countries and jurisdictions.

Our patents and applications are directed at various technological areas which we believe are valuable to our business, including:

- a wide variety of cell screening analysis tools;

- fluorescence-based reagents for cell screening;

- cell grid platforms;

- devices for the control of small fluid volumes;

38

- informatics software;

- bioinformatics software; and

- cell screening instrumentation, devices, and operating software.

We hold one exclusive license covering nine issued U.S. patents for fluorescence-based reagents for high content screening, as well as two non-exclusive licenses for such reagents.

We also rely upon trade secrets, know-how, trademarks, copyright protection, and continuing technological and licensing opportunities to develop and maintain our competitive position. Our practice is to require our employees, consultants, and outside scientific collaborators and consultants to execute confidentiality agreements upon the commencement of employment or consulting relationships with us. In the case of employees, the agreement provides that all inventions conceived by the individual while employed by us will be our exclusive property. These agreements also provide that all confidential information developed by or made known to the individual during the course of the individual's relationship with us is to be kept confidential and not disclosed to third parties, subject to limited exceptions.

Patents may provide some degree of protection for our intellectual property. However, the assertion of patent protection involves complex legal and factual determinations and is therefore uncertain. In addition, the laws governing patentability and the scope of patent coverage continue to evolve, particularly in the areas of technology of interest to us. As a result, there can be no assurance that patents will issue from any of our patent applications or from applications licensed to us. The scope of any of our issued patents may not be sufficiently broad to offer meaningful protection. In addition, our issued patent or patents licensed to us may be successfully challenged, invalidated, circumvented or unenforceable so that our patent rights would not create an effective competitive barrier. Moreover, the laws of some foreign countries may not protect our proprietary rights to the same extents as do the laws of the United States. In view of these factors, our intellectual property positions bear some degree of uncertainty.

Although we are not currently a party to any legal proceedings relating to our intellectual property, in the future, third parties may file claims asserting that our technologies or products infringe on their intellectual property. We cannot predict whether third parties will assert such claims against us or against the licensors of technology licensed to us, or whether those claims will harm our business. If we are forced to defend against such claims, whether they are with or without any merit, whether they are resolved in favor of or against us or our licensors, we may face costly litigation and diversion of management's attention and resources. As a result of such disputes, we may have to develop costly non-infringing technology, or enter into licensing agreements. These agreements, if necessary, may be unavailable on terms acceptable to us, if at all, which could seriously harm our business or financial condition.

EMPLOYEES

As of December 31, 1999, we had 85 full-time employees, eight in sales and marketing, 21 in informatics/bioinformatics, 26 in cellular analysis tools/kit development/manufacturing, 19 in research and development and 11 in administration. None of our employees are covered by collective bargaining agreements, nor have we experienced any work stoppage. We consider our relations with our employees to be good.

SCIENTIFIC ADVISORY BOARD

An important component of our scientific strategy is to establish collaborative relationships with researchers in our fields of interest. Our scientific advisors attend periodic meetings of our Scientific Advisory Board. None of our scientific advisors is employed by us, and they may have commitments to or consulting or advisory agreements with other entities that may limit their availability to us. These companies may also

39

compete with us. In general, our scientific advisors hold stock options, own our stock and/or receive financial remuneration for their services. The following are the members of our scientific advisory board:

Alan S. Waggoner, Ph.D. is the Director, Science and Technology Center at Carnegie Mellon University. He is a founder of Cellomics.

Harold Craighead, Ph.D. is Director of the Nanobiotechnology Center and a Professor of Applied and Engineering Physics at Cornell University where he also served as Director of the National Nanofabrication Facility from 1989 to 1995.

Richard Haugland, Ph.D. is the founder and since 1975 has been the President of Molecular Probes, Inc.

Susan Henry, Ph.D. has been the Dean-Mellon College of Science of Carnegie Mellon University since 1991 and is also a Professor-Department of Biological Sciences, at Carnegie Mellon University since 1987.

Takeo Kanade, Ph.D. is a computer scientist/electrical engineer, a member of the National Academy of Sciences, and the Director of the Robotics Institute at Carnegie Mellon University.

John S. Lazo, Ph.D. is a Professor and Chairman of Pharmacology at the University of Pittsburgh School of Medicine. He is also Co-Director of the Experimental Therapeutics Program at the Pittsburgh Cancer Institute and Visiting Scientist, Imperial Cancer Research Fund, University of Oxford, Oxford, U.K.

Milan Mrksich, Ph.D. is Assistant Professor of Chemistry at the University of Chicago.

Franklyn Prendergast, MD, Ph.D. is the Edmond and Marion Guggenheim Professor of Biochemistry and Molecular Biology and Director of the Mayo Clinic Cancer Center where he has also served as the Chairman of the Biochemistry Department and a member of the Board of Governors of the Mayo Clinic and Foundation.

Felix de la Iglesia, MD is the Vice President, Pathology and Experimental Toxicology, at Warner Lambert/Parke-Davis Pharmaceutical Research since 1983.

George N. Pavlakis, MD, Ph.D. is the Head of the Human Retrovirus Section at the National Cancer Institute.

FACILITIES

Our research and development, manufacturing and administrative facilities are currently located in approximately 37,000 square feet of leased space in Pittsburgh, Pennsylvania. Leases for this space initially expire in April and June 2001. We believe that our current facilities are adequate to meet our immediate needs. Additional space will be required as we expand our research and development activities and production capabilities. We do not anticipate any significant difficulties in obtaining additional facilities, as necessary.

LEGAL PROCEEDINGS

We are not currently party to any legal proceedings. However, we may from time to time become a party to various legal proceedings arising in the ordinary course of our business.

40

MANAGEMENT

DIRECTORS AND EXECUTIVE OFFICERS

Our directors and executive officers, their ages and positions as of March 31, 2000 are as follows:

NAME                                                 AGE    POSITION
----                                                 ---    --------
D. Lansing Taylor, Ph.D. ..........................  53     President and Chief Executive Officer, Director
R. Terry Dunlay....................................  41     Executive Vice President and Chief Information Officer
L. Robert Johnston, Jr. ...........................  40     Vice President and Chief Financial Officer
Michael A. Nemzek..................................  40     Chief Business Officer
Alan W. Seadler, Ph.D. ............................  51     Chief Operating Officer
William Busa, Ph.D. ...............................  48     Vice President, Bioinformatics
Jeff W. Paslay, Ph.D. .............................  53     Senior Vice President, Pharmaceutical Technology
Albert H. Gough, Ph.D. ............................  47     Vice President, Research and Development
John M. Boles......................................  63     Chairman of the Board and Director
Alan Mendelson.....................................  52     Director
Arnold L. Oronsky, Ph.D. ..........................  59     Director
James A. Sharp.....................................  45     Director

D. Lansing Taylor, Ph.D. has served as our President and Chief Executive Officer since October 1996. Dr. Taylor is a founder of Cellomics. Dr. Taylor was a Professor of Biological Sciences and Vice-Dean of the Division of Molecular Sciences at Carnegie Mellon University from 1982 to 1998. He was also the Director of the Center for Fluorescence Research and Director of the National Science Foundation Center for Light Microscope Imaging and Biotechnology. Dr. Taylor co-founded Biological Detection Systems, Inc., a reagents and instruments company, in 1990 where he served as a director and a consultant. Prior to Carnegie Mellon University, Dr. Taylor was a Professor of Biology at Harvard University, where he pioneered fluorescence ratio imaging techniques. Dr. Taylor received his B.S. degree in Zoology from the University of Maryland and his Ph.D. in Cell Biology from the State University of New York, Albany.

R. Terry Dunlay has served as our Executive Vice President and Chief Information Officer since February 2000. From October 1996 to February 2000, he served as our Executive Vice President. Mr. Dunlay is a founder of Cellomics. Mr. Dunlay held various positions, including President and Chief Executive Officer at Biological Detection, Inc., a software company, from 1996 to 1997 and Vice President of Engineering/ Director of Engineering at Biological Detection Systems, Inc., a reagents and instrumentation company, from 1992 to 1996. Mr. Dunlay received his B.S. degree in Electrical Engineering from the University of Pittsburgh and his M.S. degree in Electrical Engineering from Arizona State University.

L. Robert Johnston, Jr. has served as our Vice President and Chief Financial Officer since November 1998. Prior to joining our company, Mr. Johnston was Senior Vice President, Finance and Chief Financial Officer at Oncormed, Inc., a cancer genetics biotech company, from 1994 to 1998. Prior to Oncormed, Mr. Johnston held various positions including Assistant Treasurer at American Mobile Satellite Corporation, a telecommunications company in Reston, Virginia from 1990 to 1994. Mr. Johnston received his B.A. degree from the University of Virginia and his M.B.A. from the Darden Graduate School of Business at the University of Virginia.

Michael A. Nemzek has served as our Chief Business Officer since February 2000. From December 1998 to February 2000, he was our Senior Vice President of Sales and Marketing. Prior to joining our company, Mr. Nemzek was previously Vice President, Marketing - Tropix Center of Excellence, PE Biosystems Division of Perkin Elmer Corporation, a life sciences company, from 1996 to 1998. Prior to Perkin Elmer, Mr. Nemzek was Vice President of Sales and Marketing at Genosys Biotechnologies, Inc., a manufacturer of custom synthetic DNA, peptides, genes and kit products from 1994 to 1996 and Vice President of Sales and

41

Marketing for Tropix, Inc., a manufacturer of non-isotopic reagents from 1991 to 1994. Mr. Nemzek received his B.A. degree in Chemistry from the University of North Carolina at Charlotte, his M.Sc. degree in Analytical Chemistry from North Carolina State University and his Master of General Administration in Marketing Management from the University of Maryland.

Alan W. Seadler, Ph.D. has served as our Chief Operating Officer since February 2000. From January 1999 to February 2000, Dr. Seadler was our Vice President, Manufacturing and Operations. Dr. Seadler was Vice President for Technology Development and Reagent Manufacturing at Visible Genetics, Inc., a reagent/kit diagnostic company, from 1996 to 1999. Prior to Visible Genetics, he was a Site Manager for Amersham Life Science, Inc., a biomedical research and manufacturing firm, from 1995 to 1996. Dr. Seadler was the Vice President, Operations, General Manager at Biological Detection Systems, Inc., a reagents company, from 1991 to 1995. Dr. Seadler received his B.A. degree in Biology and Chemistry and his Ph.D. in Biology from the Case Western Reserve University.

William Busa, Ph.D. has served as our Vice President of Bioinformatics since September 1999. Prior to joining our company, Dr. Busa was the consulting editor for the American Association for the Advancement of Science, Knowledge Environment Development Program from 1998 to 1999. Dr. Busa was also President of Memex Press, Inc., a technical publisher, from 1996 to 1999. Dr. Busa also served on the faculty of Johns Hopkins University for eleven years. Dr. Busa received his B.S. degree in the fields of Biological, Information and Computer Sciences at the University of California at Irvine and his Ph.D. in Zoology from the University of California at Davis.

Jefferson W. Paslay, Ph.D. has served as our Senior Vice President Pharmaceutical Technologies since September 1998. Prior to joining our company, Dr. Paslay held various positions including General Manager at MDS-Panlabs, a screening services organization, from 1994 to 1998. Prior to MDS-Panlabs, he held various positions including Director, Chemical and Biological Screening at the Upjohn Company from 1981 to 1994. Dr. Paslay received his B.Sc. degree in Biology from the University of Mississippi, his M.Sc. degree in Microbiology (Immunology) from the University of Mississippi and his Ph.D. in Molecular Cell Biology (Immunology) from the University of Alabama, Birmingham.

Albert Gough, Ph.D. has served as our Vice President Research and Development since May 1999. From December 1998 to May 1999, he served as our Vice President of Systems Engineering and from November 1996 to December 1998, he served as our Director of Drug Discovery Systems. Prior to joining our company, Dr. Gough was the Director of Imaging Technology at Carnegie Mellon University where he directed a project in the development of automated imaging systems for scientific research applications from 1993 to 1996. Dr. Gough received his B.S. degree in Biology from the University of Michigan and his Ph.D. in Biophysics from Carnegie Mellon University.

John M. Boles has served as a director and the Chairman of our Board since our inception in 1995. Mr. Boles is a founder of our company. Mr. Boles has been engaged in the investment banking business since 1972 and has served for the last five years as Managing Partner of Boles Knop & Company LLC, an investment banking firm. Mr. Boles received his undergraduate degree from Lake Forest College, his M.S. from the University of Toronto and his M.B.A. from the University of Michigan.

Alan Mendelson has served as a director since 1998. He is a co-founder and partner of Axiom Ventures, a venture capital firm which focuses on investing in biotech/hi-tech companies, for more than the past five years. Mr. Mendelson received his B.A. degree in Economics from Trinity College and his law degree from the University of Connecticut. Mr. Mendelson is a director of Ziplink Inc., a publicly traded company.

Arnold L. Oronsky, Ph.D. has served as a director since 1998. He has been a general partner in InterWest Partners, a venture capital firm investing in the medical technology sector, since 1994. Dr. Oronsky received his B.A. degree from New York University and his Ph.D. from Columbia University, College of Physicians & Surgeons. Dr. Oronsky is a director of Corita Corporation, a publicly traded company and Coulter Pharmaceutical, Inc., a publicly traded company.

James A. Sharp has served as a director since 1996. He has been the President, Microscopy Division of Carl Zeiss, Inc., a subsidiary of Carl Zeiss Jena, GmbH, since October 1999. From 1995 to 1999, Mr. Sharp

42

was a Senior Vice President of Carl Zeiss Jena, GmbH, a manufacturer of optical, scientific and industrial instruments. Mr. Sharp received a degree from The DeVry Institute of Technology.

COMPOSITION OF THE BOARD

Our amended and restated certificate of incorporation and bylaws provide that our board of directors be divided into three classes of nearly equal number: Classes A, B and C. The term of office of directors comprising Class A expires at the next annual meeting of stockholders; the term of office of directors comprising Class B expires at the second annual meeting of stockholders; and the term of office of directors comprising Class C expires at the third annual meeting of stockholders. At each annual meeting of stockholders thereafter, the successors to directors whose terms will then expire will be elected to serve from the time of election and qualification until the third annual meeting of stockholders following election and until a successor will have been duly elected and will have qualified.

Our bylaws authorize our board of directors to fix the number of directors at not less than one. The board of directors currently has five members. The board of directors has no present plans to increase the number of directors.

There are no family relationships among any of our directors or executive officers.

Our amended and restated certificate of incorporation requires the affirmative vote of holders of 80% of the issued and outstanding shares of common stock entitled to vote for the election of directors to remove any director or the entire board of directors. Under Delaware law, our directors can only be removed for "cause."

BOARD COMMITTEES

Our board of directors currently has two committees: an audit committee and a compensation committee.

The audit committee was established on March 18, 1998, and reviews, acts on and reports to our Board of Directors with respect to various auditing and accounting matters, including the recommendation of our independent accountants, the scope of the annual audits, the fees to be paid to the independent accountants, the performance of our independent accountants and our accounting practices. The members of the audit committee are Messrs. Boles and Mendelson and Dr. Oronsky.

The compensation committee was established on March 18, 1998, and recommends, reviews and oversees the salaries, benefits, granting of options and stock plans for our employees, consultants and directors. The compensation committee also administers our compensation plans. The members of the compensation committee are Messrs. Boles and Mendelson and Dr. Oronsky.

DIRECTOR COMPENSATION

All of our directors are reimbursed for the reasonable expenses of attending the meetings of our board of directors or committees. Under our 2000 Stock Option Plan, each non-employee member of our Board of Directors will receive an option to purchase 11,772 shares of our common stock in March 2000. That option will vest in two installments commencing in March 2000, and the first yearly anniversary of that date, respectively, for our then current non-employee directors. In the case of first time directors, vesting will occur in three installments beginning on the date that he or she joins our board and on the first and second yearly anniversaries of that date. Other than the forgoing, the directors receive no other compensation for their services as directors.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

Our compensation committee currently consists of Messrs. Boles and Mendelson and Dr. Oronsky. No member of the compensation committee has been an officer or employee of ours at any time. No interlocking relationship exists between any member of our board of directors or our compensation committee and any member of our board of directors or compensation committee of any other corporation. Prior to the formation

43

of the compensation committee on March 18, 1998, our board of directors as a whole made decisions relating to compensation of our executive officers.

EXECUTIVE COMPENSATION

SUMMARY COMPENSATION TABLE

The following table sets forth the annual compensation earned during 1999 by our chief executive officer and the four highest paid executive officers whose total annual salary and bonus exceeded $100,000. These individuals are referred to as the "named executive officers" here and elsewhere in this prospectus.

                                                                    ANNUAL COMPENSATION
                                                            ------------------------------------
                                                                                   OTHER ANNUAL
              NAME AND PRINCIPAL POSITION                    SALARY      BONUS     COMPENSATION
              ---------------------------                   --------    -------    -------------
D. Lansing Taylor, Ph.D.................................    $255,000    $40,000            --
  President and Chief Executive Officer

R. Terry Dunlay.........................................     135,000     22,950            --
  Executive Vice President and Chief Information Officer

L. Robert Johnston, Jr..................................     173,147     29,240       $53,837(1)
  Vice President and Chief Financial Officer

Michael Nemzek..........................................     170,567     47,600        73,457(2)
  Senior Vice President of Sales and Marketing

Alan Seadler............................................     100,000     35,000            --
  Chief Operating Officer


(1) Mr. Johnston's other annual compensation for 1999 reflects a relocation allowance.

(2) Mr. Nemzek's other annual compensation for 1999 reflects a relocation allowance.

44

1999 OPTION GRANTS

The following table sets forth information regarding options granted to each of our named executive officers during the year 1999. The percentage of options granted is based on an aggregate of 454,745 options granted by us during 1999. The amounts shown as potential realizable value are based on assumed 5% and 10% annual rates of stock price appreciation from the date of grant to the end of the option term and are provided in accordance with rules of the SEC. They do not represent our estimate or projections of the future common stock price. Actual gains, if any, on stock option exercise are dependent on the future performance of our common stock, overall market conditions and the option holder's continued employment during the vesting period. All options in this table were granted under our Cellomics, Inc. Stock Plan, have ten year terms, will terminate before their expiration dates if the optionee leaves his employment with us, and, unless otherwise noted, vest over a period of four years. We have not granted any stock appreciation rights. In estimating the gain realized by these option holders, we have deducted the option exercise price, but have not deducted taxes or any other expenses payable upon the exercise of the option or the sale of the common stock underlying the option.

                                                INDIVIDUAL GRANTS
                          -------------------------------------------------------------      POTENTIAL REALIZABLE VALUE AT
                          NUMBER OF                                                          ASSUMED ANNUAL RATES OF STOCK
                          SECURITIES    PERCENT OF TOTAL                                     PRICE APPRECIATION FOR OPTION
                          UNDERLYING   OPTIONS GRANTED TO                                               TERM(1)
                           OPTIONS        EMPLOYEES IN      EXERCISE PRICE   EXPIRATION   ------------------------------------
          NAME             GRANTED      FISCAL YEAR 1999      PER SHARE         DATE          0%           5%          10%
          ----            ----------   ------------------   --------------   ----------   ----------   ----------   ----------
D. Lansing Taylor,
  Ph.D. ................        --             --                  --              --             --           --           --
R. Terry Dunlay.........    35,320(2)           8%              $0.16          1/1/09     $  592,768   $  974,731   $1,021,146
L. Robert Johnston,
  Jr....................    17,660(3)           4                0.16         11/9/09        296,384      487,365      510,573
Michael Nemzek..........    17,660(4)           4                0.16         12/9/09        296,384      487,365      510,573
Alan Seadler............    52,980(5)          12                0.16         1/18/09        889,152    1,462,096    1,531,719
                            17,660(6)           4                0.16         6/25/09        296,384      487,365      510,573


(1) The potential realizable values have been calculated using an assumed initial public offering price of $17.00 per share.

(2) The vesting start date for the options to purchase 35,320 shares of common stock granted to Mr. Dunlay is January 15, 1998.

(3) The vesting start date for the options to purchase 17,660 shares of common stock granted to Mr. Johnston is November 9, 1998.

(4) The vesting start date for the options to purchase 17,660 shares of common stock granted to Mr. Nemzek is December 2, 1998.

(5) The vesting start date for options to purchase 52,980 shares of common stock granted to Mr. Seadler is January 18, 1999.

(6) The vesting start date for the options to purchase 17,660 shares of common stock granted to Mr. Seadler is June 25, 1999.

1999 OPTION VALUES

                                            NUMBER OF SECURITIES                 VALUE OF UNEXERCISED
                                       UNDERLYING UNEXERCISED OPTIONS            IN-THE-MONEY OPTIONS
                                            AT DECEMBER 31, 1999                AT DECEMBER 31, 1999(1)
                                       -------------------------------       -----------------------------
                NAME                   EXERCISABLE      UNEXERCISABLE        EXERCISABLE     UNEXERCISABLE
                ----                   ------------     --------------       -----------     -------------
D. Lansing Taylor, Ph.D..............    105,960            70,640           $1,784,366       $1,189,578
R. Terry Dunlay......................      8,830            26,490              148,697          446,092
L. Robert Johnston, Jr...............     30,905            92,715              520,440        1,561,321
Michael Nemzek.......................     30,905            92,715              520,440        1,561,321
Alan Seadler.........................         --            70,640                   --        1,189,578


(1) The value of unexercised in-the-money options at December 31, 1999 has been calculated using an assumed initial public offering price of $17.00 per share.

There were no options exercised during the year ended December 31, 1999.

45

1998 STOCK PLAN

Our stock plan was adopted by our board of directors on April 2, 1998. As of March 31, 2000, there were options to purchase 1,458,363 shares of common stock granted under this plan. The board of directors adopted a resolution prohibiting further grants under this plan.

The stock plan provides for the grant of incentive stock options to employees, non-qualified stock options, stock awards, stock appreciation rights and stock purchases. The stock plan provides that it will be administered by our board of directors, or a committee appointed by the board, which determines recipients and types of awards to be granted, including number of shares under the award and the vesting of the award. As of the date of this prospectus, all awards granted under the stock plan have been made to our employees, directors and consultants and have been in the form of non-qualified stock options. All awards under the stock plan terminate not more than 10 years from the date of grant, subject to the earlier termination upon or after a fixed period following an optionee's death or termination of employment with us. The vesting provisions of each outstanding option was determined by our board of directors and those options are not generally assignable or otherwise transferable except by will or the laws of descent and distribution. In the event of a change in control and in other circumstances described in the stock plan, our board of directors can substitute on an equitable basis our securities with securities of the successor or surviving entity in the change of control, require that the unexercised awards be exercised within a certain period of time, or allow the unexercised portions of the awards to be purchased by the successor entity at the then fair market value.

2000 STOCK PLAN

We have adopted a new stock plan known as the 2000 Stock Plan. We have reserved 1,165,350 shares of our common stock for issuance upon exercise of awards under the 2000 Stock Plan. The following is a description of the material features and provisions of the 2000 Stock Plan.

Awards

Under the 2000 Stock Plan, we may grant incentive stock options intended to qualify for special tax treatment, non-qualified stock options, stock grants, stock appreciation rights and stock purchase rights. Each option or appreciation right will expire within 10 years of the original grant date, unless the grantee owns more than 10% of our stock, in which case the option or appreciation rights will expire within 5 years of the original grant date. Incentive options may not have exercise prices less than the fair market value at the time of grant. If the grantee owns more than 10% of our stock, the option may not have an exercise price less than 110% of the fair market value at the time of grant. Upon exercise, an option grantee may pay for the shares with cash, other shares, shares deducted from the total granted under the option or other compensation acceptable to the administrator of the plan.

If a grantee's employment is terminated, the grantee may, within 90 days after termination, exercise his or her option or appreciation right to the extent that the option has vested by the date of termination. If a grantee is disabled, the grantee may, within 12 months after becoming disabled, exercise his or her option or appreciation right to the extent that the option has vested by the date of becoming disabled. If a grantee dies, the grantee's estate may, within 12 months of the grantee's death, exercise the grantee's option or appreciation right to the extent that the option has vested by the date of the grantee's death. In each case, the option terminates with respect to the shares that had not vested. Other than by will or other transfer on death, options and appreciation rights are not transferrable.

Administration

The 2000 Stock Plan may be administered either by our board of directors, or by a committee appointed by our board. The administrator, whether our board or a committee, will have the authority to determine the fair market value of the common stock for the purposes of making an award select the eligible persons to whom awards may be granted, make the awards, determine the number of shares to be covered by each award, offer to buy out for cash or shares a granted option or appreciation right and determine the form, terms and conditions of any agreement by which any award is made. The administrator may also determine

46

whether an option or appreciation right will be paid in cash rather than stock, whether and to what extent payment of an award may be deferred, whether under certain circumstances to reduce the exercise price of an award and the restrictions applicable to any stock grants or purchase rights. The 2000 Stock Plan will expire on March 1, 2010.

Eligibility

Under the terms of the 2000 Stock Plan, nonstatutory options may be granted to our employees, non-employee directors and consultants. Incentive stock options may be granted only to our employees. Incentive stock options may not exceed $100,000 to any one person in one year. If an incentive stock option does exceed $100,000, the excess is considered to be a non-statutory option.

Adjustments

If a reorganization, recapitalization, stock dividend, merger, consolidation or other change in corporate structure affecting the number of issued shares of our common stock occurs, then the administrator of the plan can make equitable adjustments to the terms of the 2000 Stock Plan. In particular, the administrator can make an equitable adjustment in the number and type of shares authorized by the plan, the number and type of shares covered by outstanding awards under the plan, the exercise prices of the awards and, in the case of a merger or consolidation, the date of exercisability if the award is not assumed by the other entity. After the adjustments, any incentive stock options granted under the plan must continue to qualify as incentive stock options. The board of directors can amend or terminate this plan any time, although certain amendments require stockholder approval and an amendment or termination cannot adversely affect any rights under an outstanding grant without the grantee's consent.

Change in Control

The 2000 Stock Plan includes change in control provisions which may result in the accelerated vesting of outstanding option grants and stock issuances. If we are acquired by merger or asset sale, each outstanding option under the discretionary option grant program which is not to be assumed by the successor corporation will immediately become exercisable for all the option shares, and all outstanding unvested shares will immediately vest, except to the extent our repurchase rights with respect to those shares are to be assigned to the successor corporation. Our compensation committee has the discretion to, on a change in control, vest and make exercisable any option granted under the plan. In addition, our compensation committee may grant options and structure repurchase rights so that the shares subject to those options or repurchase rights will immediately vest in connection with a successful tender offer for more than 50% of our outstanding voting stock or a change in control of our board through one or more contested elections. Such accelerated vesting may occur either at the time of such transaction or upon the subsequent termination of the individual's service.

EMPLOYEE STOCK PURCHASE PLAN

Our board of directors intends to adopt a new employee stock purchase plan to present to our stockholders for approval prior to the completion of this offering. If adopted, our Employee Stock Purchase Plan will provide our employees with an opportunity to purchase our common stock through accumulated payroll deductions and at a discount from fair market value. The total number of shares of common stock with respect to which purchases may be made under the plan will be 1,059,600, which amount shall be adjusted in accordance with the terms of the plan. The Employee Stock Purchase Plan will be administered by our compensation committee. Eligible employees may purchase up to a maximum fair market value of $25,000 for all purchases ending within the same calendar year under this plan. Our employees will be eligible to participate if they are employed by us for at least 20 hours per week, for more than five months in any calendar year and do not own 5% or more of our voting stock. The initial offering period under the plan will commence on the date that the registration statement with respect to this offering is declared effective by the SEC, and will end on or about December 31, 2000. We intend to have new offering periods commence every six months after the ending date of the initial period. The purchase price per share for our common

47

stock under the plan will be equal to the lower of 85% of the fair market value of our common stock on the first or last day of each purchase period. Employees may end their participation under the plan at any time prior to the exercise date of any one purchase period and, generally, such participation will be automatically terminated on termination of employment. In the event we are the surviving corporation in a merger, reorganization or other business combination, options to purchase shares issued under the plan will be assumed. A dissolution or liquidation or a merger or consolidation in which we are not the surviving entity will cause each option then outstanding to terminate. Generally, our board of directors will have the power to amend, modify or terminate the plan at any time, provided the rights of plan participants are not impaired. The plan will terminate on December 31, 2005 unless earlier terminated by our board of directors.

EMPLOYMENT AND SEVERANCE AGREEMENTS

All of our current employees have entered into agreements with us that contain covenants relating to the protection of our confidential information, assignment of inventions, restrictions on competition and soliciting our customers, employees or independent contractors. We also have employment agreements with our chief executive officer and each of the named executive officers.

Dr. Taylor serves as our President and Chief Executive Officer. Dr. Taylor's employment agreement is for a period of three years ending September 30, 2001. If Dr. Taylor is terminated without cause, as that term is defined in the agreement, he is entitled to receive all earned salary, bonuses and fringe benefits through the date of notice of termination, 12 months' salary following the date of notice, and automatic acceleration of all options held at that date. At the discretion of our board, Dr. Taylor's base salary is subject to annual adjustment increases of $5,000 and $10,000 in each of the last two years, respectively, of this agreement. In each year of the agreement, Dr. Taylor is also entitled to receive an incentive bonus up to a maximum of twenty percent of his base salary in that year, based on a formula agreed to with our board of directors. However, our board of directors subsequently approved an increase in Dr. Taylor's potential annual performance bonus for 2000 from twenty percent to thirty percent, and may award other bonuses in its discretion. In addition, options held by Dr. Taylor as of December 31, 1999 vest on October 1 of each year of his continued employment.

Under an agreement with us dated February 2, 1999, Mr. Dunlay serves as our Executive Vice-President of Development. He is entitled to receive an initial annual salary of $135,000 and annual performance bonuses up to twenty percent of his salary subject to review and approval by our board of directors. The term of Mr. Dunlay's agreement is for a one year period that automatically renews unless we terminate the agreement prior to ninety days before the beginning of the next term. If we terminate Mr. Dunlay, unless that termination is for cause, as defined in the agreement, we are obligated to pay him an amount equal to six months of his base salary.

Under an agreement with us dated October 15, 1998, Mr. Johnston serves as our Vice-President and Chief Financial Officer. He is entitled to an annual salary of $172,000, subject to adjustment by the Board of Directors. He is also eligible to receive annual performance bonuses up to twenty percent of his salary subject to review and approval by our board of directors. However, our board of directors subsequently approved an increase in Mr. Johnston's potential annual performance for 2000 from twenty percent to twenty-five percent and may award other bonuses in its discretion. Mr. Johnston was also provided with a relocation allowance of $53,837. All of Mr. Johnston's unvested options will vest on a change of control and if Mr. Johnston is terminated by constructive termination, as defined in the agreement, fifty percent of his unvested option will vest on the date of termination. If we terminate Mr. Johnston, unless that termination is for cause, as defined in the agreement, we are obligated to pay him an amount equal to six months of his base salary.

Under an agreement with us dated November 9, 1998, Mr. Nemzek serves as our Senior Vice-President for Sales and Marketing. He is entitled to an annual salary of $170,000, subject to adjustment by the Board of Directors. He is also eligible to receive annual performance bonuses up to thirty-five percent of his salary subject to review and approval by our board of directors. Mr. Nemzek was also provided with a relocation allowance of $73,457. If we terminate Mr. Nemzek, unless that termination is for cause, as defined in the agreement, we are obligated to pay him an amount equal to six months of his base salary.

48

Under an agreement with us dated October 12, 1998, Mr. Seadler serves as our Chief Operating Officer. He is entitled to receive an initial annual salary of $100,000 and annual performance bonuses up to twenty percent of his salary subject to review and approval by our board of directors. Mr. Seadler was also provided an additional $10,000 signing bonus upon his start date. If we terminate Mr. Seadler, unless that termination is for cause, as defined in the agreement, we are obligated to pay him an amount equal to six months of his base salary.

LIMITATION OF LIABILITY AND INDEMNIFICATION OF DIRECTORS AND OFFICERS

Section 145 of the Delaware General Corporation Law authorizes a corporation's board of directors to grant indemnity to directors and officers in terms sufficiently broad to permit such indemnification under certain circumstances for liabilities arising under the Securities Act, including reimbursement for expenses incurred.

As permitted by Delaware law, our amended and restated certificate of incorporation limits the liability of directors for monetary damages for breach of their fiduciary duties as directors, except liability for:

- any breach of their duty of loyalty to us or our stockholders;

- acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law;

- unlawful payments of dividends or unlawful stock repurchases or redemptions; or

- any transaction from which the director derived an improper personal benefit.

Our amended and restated certificate of incorporation and bylaws provide that we shall indemnify our directors, officers, employees and agents to the fullest extent permitted by law, and that we will advance expenses to our directors and officers in connection with a legal proceeding, subject to an undertaking to repay our costs, should the indemnified person lose the proceeding.

Prior to the completion of this offering, we intend to enter into indemnification agreements with each of our officers and directors to give them additional contractual assurances regarding the scope of the indemnification provided in our amended and restated certificate of incorporation and bylaws, and to provide additional procedural protections.

There is currently no pending litigation or proceeding involving any of our directors, officers, employees or agents where indemnification will be required or permitted. We are not aware of any pending or threatened litigation or proceeding that might result in a claim for such indemnification.

49

CERTAIN TRANSACTIONS

REGISTRATION RIGHTS

Some of our stockholders, some of whom own more than 10% of our common stock, have certain registration rights which they may exercise after this offering. They may request that we register their shares for sale with the Securities and Exchange Commission, and, if all of the conditions that are contained in our agreements with them are met, we must register their shares. We would be required to bear all the expenses of a registration. For a more detailed description see also "Description of Capital Stock -- Registration Rights."

PRIOR FINANCINGS

January 1998 and 1999 Series A Preferred Financing

In January 1998 we sold an aggregate of 3,477,222 shares of our Series A preferred stock at a price of $1.59 per share and issued warrants to purchase an aggregate of 942,705 shares of common stock with exercise prices ranging from $1.59 to $1.87.

In that private placement we sold:

- 1,142,560 and 35,822 shares of Series A preferred stock and issued warrants to purchase 228,513 and 7,163 shares of our common stock to InterWest Partners VI, L.P. and InterWest Investors VI, L.P., respectively;

- 864,146 shares of Series A preferred stock and issued warrants to purchase an additional 172,828 shares of our common stock to Axiom Venture Partners II Limited Partnership;

- 771,693 and 13,895 shares of Series A preferred stock and issued warrants to purchase 154,338 and 2,780 shares of our common stock to Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P., respectively;

- 179,623 and 134,612 shares of our Series A preferred stock and issued warrants to purchase 35,924 and 26,924 shares of our common stock to Oxford Bioscience Partners II, L.P. and Oxford Bioscience Partners (Bermuda) II Limited Partnership, respectively; and

- 314,235 shares of Series A preferred stock, to Komasta Properties, Ltd.

In addition, we converted a $450,000 note plus accrued interest into 314,235 shares of Series A preferred stock and issued warrants to purchase an aggregate of 188,542 shares of our preferred stock with an exercise price of $2.39 to Komasta Properties, Ltd.

In January 1999 as a subsequent closing we sold an aggregate of 3,142,350 shares of our Series A preferred stock at a price of $1.59 per share.

In that private placement we sold:

- 1,142,560 and 35,822 shares of Series A preferred stock to InterWest Partners VI, L.P. and InterWest Investors VI, L.P., respectively;

- 864,146 shares of Series A preferred stock to Axiom Venture Partners II Limited Partnership;

- 771,693 and 13,895 shares of Series A preferred stock to Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P., respectively; and

- 179,623 and 134,612 shares of our Series A preferred stock to Oxford Bioscience Partners II, L.P. and Oxford Bioscience Partners (Bermuda) II Limited Partnership, respectively.

November 1999 Convertible Debt Financing

In November 1999, we issued convertible promissory notes in the aggregate principal amount of $1.8 million. These notes carried an interest rate of 10.0% per year. On February 24, 2000, the outstanding

50

principal and interest on each of these convertible notes converted into 538,958 shares of our Series B preferred stock at a price of $3.42 per share, and we issued warrants to purchase an aggregate of 289,624 shares of our common stock. These warrants were issued at an exercise price of $3.42.

In this transaction, the demand notes were converted into:

- 217,751 and 6,824 shares of our Series B preferred stock and warrants to purchase 117,015 and 3,666 shares of common stock to InterWest Partners VI, L.P. and InterWest Investors VI, L.P., respectively;

- 88,240 and 1,586 shares of our Series B preferred stock and warrants to purchase 47,417 and 851 shares of common stock to Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P., respectively;

- 164,665 shares of our Series B preferred stock and warrants to purchase 88,501 shares of common stock to Axiom Venture Partners II Limited Partnership; and

- 21,923, 16,427 and 21,517 shares of our Series B preferred stock and warrants to purchase 11,783, 8,826 and 11,564 shares of common stock to Oxford Biosciences Partners II, L.P., Oxford Biosciences Partners (Bermuda) II Limited Partnership and Oxford Biosciences Partners (GS-Adjunct) II, L.P., respectively.

February 2000 Series B Preferred Financing

In February 2000, we sold an aggregate of 1,911,102 shares of our Series B preferred stock at a price of $3.42 per share.

In that private placement we sold:

- 855,931 and 285,311 shares of our Series B preferred stock to Vector Later-Stage Equity Fund II (QP), L.P. and Vector Later-Stage Equity Fund II, L.P., respectively;

- 157,919 and 4,952 shares of Series B preferred stock to InterWest Partners VI, L.P. and InterWest Investors VI, L.P., respectively;

- 146,620 shares of our Series B preferred stock and warrants to purchase 18,649 shares of common stock to Komasta Properties, Ltd.;

- 114,981 and 2,070 shares of our Series B preferred stock to Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P., respectively;

- 95,731, 71,742 and 93,962 shares of our Series B preferred stock to Oxford Bioscience Partners II, L.P., Oxford Bioscience Partners (Bermuda) II Limited Partnership and Oxford Biosciences Partners (GS-Adjunct) II, L.P., respectively; and

- 73,158 shares of Series B preferred stock to Axiom Venture Partners.

Conversion of Preferred Stock

Our preferred stock will convert into common stock upon the closing of this offering on a one-to-one basis. We must pay to the holders of the preferred stock the dividend arrearages on their shares which presently aggregate approximately $1.7 million as a result of the conversion of the preferred stock. Thus, we will be paying the following amounts to the indicated preferred stockholder:

- InterWest Partners VI, L.P. and InterWest Investors VI, L.P. will be paid approximately $537,000 and $17,000, respectively;

- Axiom Venture Partners II Limited Partnership will be paid approximately $404,000;

- Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P. will be paid approximately $359,000 and $6,000, respectively;

51

- Oxford Bioscience Partners II, L.P., Oxford Bioscience Partners (Bermuda) II Limited Partnership, Oxford Biosciences Partners (GS-Adjunct) II, L.P. will be paid approximately $85,000, $64,000 and $3,000, respectively;

- Komasta Properties, Ltd. will be paid approximately $186,000; and

- Vector Later-Stage Equity Fund II (QP), L.P. and Vector Later-Stage Equity Fund II, L.P. will be paid approximately $26,000.

Arnold L. Oronsky, Ph.D., a member of our board of directors, is a general partner of InterWest Partners, an affiliate of InterWest Partners VI, L.P. and InterWest Investors VI, L.P. Mr. Mendelson, a member of our board of directors, is general partner of Axiom Ventures, an affiliate of Axiom Venture Partners.

ZEISS AGREEMENTS

In April 1998 we entered into a collaboration agreement with Zeiss, which holds in excess of 5% of our common stock. The collaboration agreement was amended and restated by two agreements, a Development, Manufacturing and Supply Agreement and a Sales and Marketing Agreement for UHTS Products in February 2000.

Under the Development, Manufacturing and Supply Agreement, by which we engaged Zeiss to cooperate in the development of our ArrayScan Kinetics Reader and ArrayScan Kinetics Workstation products to our specifications, we have capital expenditure commitments to Zeiss of $1.2 million during 2000 and have agreed to reimburse Zeiss for an additional $2.0 million for development costs incurred by Zeiss through December 31, 1999. We intend to repay the development costs during 2000 and 2001 in equal installments of $1.0 million. We also purchased approximately $317,000 and $165,000 of components from Zeiss for our products in 1999 and 1998. Under the Agreement, we are the owner of all intellectual property of components specifically developed and manufactured for the ArrayScan products and Zeiss is prohibited from incorporating such technology into competing products in consideration for our agreement to purchase such products from Zeiss. Moreover, Zeiss has agreed to manufacture for us high content screening instruments on an exclusive basis for a limited period of time. Unless terminated earlier by either party after December 2002, the Agreement shall remain in effect until December 31, 2005.

Under the Sales and Marketing Agreement for UHTS Products, Zeiss has appointed us to be Zeiss' exclusive dealer and distributor within North America of certain ultra-high throughput screening systems manufactured by Zeiss which are complementary with our products until December 31, 2005. We are free, under the terms of the agreement, to sell the Zeiss products in North America at a sales price we establish. We will retain all revenues from our sales of Zeiss' products in North America.

TRANSACTIONS WITH DIRECTORS

Mr. Boles, a member of our board, entered into a consulting agreement with us in December, 1996. Under this agreement Mr. Boles was paid $5,000 per month. The term of the agreement was for a period of two years from the date of its execution. Under the agreement, Mr. Boles agreed to refrain from competing with us in the full field of luminescence-based tools for drug discovery or toxicology for a period of five years from the date of the agreement.

In each transaction set forth above where executive officers, directors, five percent or greater stockholders or affiliates of any of these persons purchased shares, these shares were purchased at the same price, and on the same terms, as share purchased by other investors at those times.

52

PRINCIPAL STOCKHOLDERS

The following table sets forth as of March 31, 2000, as adjusted to give effect to the sale of common stock offered hereby, certain information regarding beneficial ownership of our common stock by:

- each person or group of affiliated persons known by us to be the beneficial owner of more than 5% of the outstanding shares of common stock;

- each director;

- each named executive officer; and

- all directors and named executive officers as a group.

Beneficial ownership is determined according to the rules of the SEC, and generally means that a person has beneficial ownership of a security if he or she possesses sole or shared voting or investment power of that security, and includes options that are currently exercisable or exercisable within 60 days. Information with respect to beneficial ownership has been furnished to us by each director, officer or 5% or more stockholder, as the case may be. Except as otherwise indicated, we believe that the beneficial owners of the common stock listed below, based on the information each of them has given to us, have sole investment and voting power with respect to their shares, except where community property laws may apply.

This table lists applicable percentage ownership based on 13,579,170 shares of common stock outstanding as of March 31, 2000, and also lists applicable percentage ownership based on 19,579,170 shares of common stock outstanding after the completion of this offering. Options to purchase shares of our common stock that are exercisable within 60 days of March 31, 2000 are deemed to be beneficially owned by the persons holding these options for the purpose of computing any other person's ownership percentage.

The address for each officer who is a 5% holder is c/o Cellomics, Inc., 635 William Pitt Way, Pittsburgh, Pennsylvania 15238.

                                                                                     PERCENTAGE
                                                                                  OF COMMON STOCK
                                                                           ------------------------------
                                                          SHARES SUBJECT   PERCENT BEFORE   PERCENT AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER      TOTAL NUMBER      TO OPTIONS        OFFERING        OFFERING
------------------------------------      ------------    --------------   --------------   -------------
DIRECTORS AND NAMED OFFICERS
D. Lansing Taylor, Ph.D. ...............     830,020         105,960             6.1%            4.2%
R. Terry Dunlay.........................     480,352          21,192             3.5             2.5
L. Robert Johnston, Jr. ................      30,905          30,905              *               *
Michael A. Nemzek.......................      30,905          30,905              *               *
Alan W. Seadler, Ph.D. .................      13,245          13,245              *               *
John M. Boles...........................     731,908           7,848             5.4             3.7
Alan Mendelson..........................   2,235,317(1)        7,848            16.1            11.3
James A. Sharp..........................       7,848           7,848              *               *
Arnold Oronsky, Ph.D. ..................   3,108,414(2)        7,848            22.3            15.6
All executive officers and directors as
  a group (9 persons)...................   7,468,915         233,599            51.8            36.6

53

                                                                                     PERCENTAGE
                                                                                  OF COMMON STOCK
                                                                           ------------------------------
                                                          SHARES SUBJECT   PERCENT BEFORE   PERCENT AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER      TOTAL NUMBER      TO OPTIONS        OFFERING        OFFERING
------------------------------------      ------------    --------------   --------------   -------------
5% STOCKHOLDERS
InterWest Management VI LLC.............   3,100,566(3)                         22.2%           15.6%
Axiom Venture Partners II Limited
  Partnership...........................   2,227,469(4)                         16.1            11.2
Delphi Management III, L.L.C. ..........   1,983,439(5)                         14.4            10.0
Vector Fund Management, L.P. ...........   1,141,242(6)                          8.4             5.8
OBP Management II L.P. .................     651,648(7)                          4.8             3.3
OBP Management (Bermuda) II Limited
  Partnership...........................     393,145(8)                          2.9             2.0
Komasta Properties, Ltd. ...............     982,281(9)                          7.1             5.0
Carl Zeiss Holding Co., Inc. ...........     703,995(10)                         5.2             3.6
Alan S. Waggoner........................     688,740(11)                         5.1             3.5


* Less than 1%.

(1) Includes 1,966,141 shares of common stock that are held by Axiom Venture Partners II Limited Partnership and immediately exercisable warrants to purchase 172,828 and 88,501 shares of common stock at exercise prices of $1.87 and $3.42 per share, respectively. Axiom Venture Associates II Limited Liability Company is the general partner of Axiom Venture Partners II Limited Partnership. Mr. Mendelson shares voting control with the other three managing members of Axiom Venture Associates II Limited Liability Company, Samuel McKay and Linda Sonntag. Each managing members' address is c/o Axiom Venture Partners II Limited Partnership, City Place II, 185 Asylum Street, 17th Floor, Hartford, Connecticut 06103.

(2) Includes 2,660,790 shares of common stock held InterWest Partners VI, L.P. and 83,419 held by InterWest Investors VI, L.P. Also includes immediately exercisable warrants to purchase 228,513 and 117,015 shares of common stock at exercise prices of $1.87 and $3.42 per share, respectively, held by InterWest Partners VI, L.P. and immediately exercisable warrants to purchase for 7,163 and 3,666 shares of common stock at exercise prices of $1.87 and $3.42, respectively held by InterWest Investors VI, L.P. InterWest Management Partners VI, LLC is the general partner of both InterWest Partners, L.P. and InterWest Investors, VI. Dr. Oronsky is a managing director of InterWest Management Partners VI, LLC. Dr. Oronsky shares voting control over securities held by InterWest Partners, VI L.P. and InterWest Investor, VI, L.P. with the other managing directors of InterWest Management Partners VI, LLC, Berry Cash, Alan Crites, Philip Gianos, Scott Hedrick, Stephen Holmes, Bob Momsen and the venture member Gil Kliman. Dr. Oronsky and all other managing directors and members disclaim beneficial ownership of these shares, except to the extent they have pro rata interests in them. The managing directors' and the venture member's addresses are c/o InterWest Partners, 3000 Sand Hill Road, Menlo Park, California 94025.

(3) Includes 2,660,790 shares of common stock held InterWest Partners VI, L.P. and 83,419 held by InterWest Investors VI, L.P. Also includes immediately exercisable warrants to purchase 228,513 and 117,015 shares of common stock at exercise prices of $1.87 and $3.42 per share, respectively held by InterWest Partners VI, L.P. and immediately exercisable warrants to purchase for 7,163 and 3,666 shares of common stock at exercise prices of $1.87 and $3.42, respectively held by InterWest Investors VI, L.P. InterWest Management Partners VI, LLC is the general partner of InterWest Partners, L.P. and InterWest Investors, VI. Dr. Oronsky, Berry Cash, Alan Crites, Philip Gianos, Scott Hedrick, Stephen Holmes and Bob Momsen are the managing directors of InterWest Management Partners VI, LLC and share voting control with the venture member Gil Kliman. The address of the various InterWest partnerships is 3000 Sand Hill Road, Menlo Park, California 94025.

(4) Includes 1,966,141 shares of common stock that are held by Axiom Venture Partners II Limited Partnership and immediately exercisable warrants to purchase 172,828 and 88,501 shares of common

54

stock at exercise prices of $1.87 and $3.42 per share, respectively. Axiom Venture Associates II Limited Liability Company is the general partner of Axiom Venture Partners II Limited Partnership. Mr. Mendelson shares voting control with the other managing members of Axiom Venture Associates II Limited Liability Company, Samuel McKay and Linda Sonntag. Their address is c/o Axiom Venture Partners II Limited Partnership, City Place II, 185 Asylum Street, 17th Floor, Hartford, Connecticut 06103.

(5) Includes 1,746,606 shares of common stock held by Delphi Ventures III, L.P. and 31,445 shares of common stock held by Delphi BioInvestments III, L.P. Also includes immediately exercisable warrants to purchase 154,338 and 47,417 shares of common stock of exercise prices of $1.87 and $3.42 per share, respectively, held by Delphi Ventures III, L.P. and immediately exercisable warrants to purchase 2,780 and 851 shares of common stock at exercise prices of $1.87 and $3.42, respectively, held by Delphi BioInvestments III, L.P. Delphi Management Partners III, L.L.C. is the general partner of Delphi Ventures III, L.P. and Delphi BioInvestments III, L.P. The managing members of Delphi Management Partners III, L.L.C., James Bochnowski, David Douglas, and Donald Lothrop, share voting control and disclaim beneficial ownership except to the extent their pecuniary interest arises from their partnership interests. The address of the various Delphi partnerships is 3000 Sand Hill Road, Bldg. 3, 135, Menlo Park, CA 94025.

(6) Includes 855,931 shares of common stock held by Vector Later-Stage Equity Fund II (QP), L.P. and 285,311 shares of common stock held by Vector Later-Stage Equity Fund II, L.P. The general partner of each fund is Vector Fund Management, LLC, which has appointed Vector Fund Management, L.P. as the manager of the shares. There is no single person at the funds that exercises voting or investment control over the shares held by the funds. Voting and investment of the shares is conducted by an internal investment committee of Vector Fund Management, L.P. The address of the funds is 1751 Lake Cook Road, Deerfield, IL 60015.

(7) Includes 476,901 and 115,479 shares of common stock held by Oxford BioScience Partners II, L.P. and Oxford BioScience Partners (GS-Adjunct) II, L.P., respectively. Also includes warrants to purchase 35,924 and 11,783 shares of common stock at exercise prices of $1.87 and $3.42, respectively held by Oxford BioScience Partners II, L.P. and a warrant to purchase 11,564 shares of common stock at an exercise price of $3.42 held by Oxford BioSciences Partners (GS-Adjunct) II, L.P. OBP - Management II L.P. is the general partner of Oxford BioScience Partners II, L.P. and Oxford BioScience Partners (GS-Adjunct) II, L.P. OBP - Management II L.P. and OBP Management (Bermuda) II Limited Partnership are controlled by the same individuals, Alan G. Walton, Cornelius P. Ryan, Edmund M. Olivier, and Jonathan J. Fleming. The address of the Oxford partnerships is 315 Post Rd West, Suite 2, Westport, CT 06880-4739.

(8) Includes 357,392 shares of common stock held by Oxford Bioscience Partners (Bermuda) Limited Partnership, warrants to purchase 26,924 and 8,826 shares of common stock at exercise prices of $1.87 and $3.42, respectively held by Oxford Biosciences Partners (Bermuda) II Limited Partnership. OBP Management (Bermuda) II Limited Partnership. OBP - Management II L.P. is the general partner of Oxford BioScience Partners II, L.P. and Oxford BioScience Partners (GS-Adjunct) II, L.P. OBP - Management II L.P. and OBP Management (Bermuda) II Limited Partnership are controlled by the same individuals, Alan G. Walton, Cornelius P. Ryan, Edmund M. Olivier, and Jonathan J. Fleming. The address of the Oxford partnerships is 315 Post Rd West, Suite 2, Westport, CT 06880-4739.

(9) Includes 775,090 shares of common stock and immediately exercisable warrants to purchase 188,542 shares of Series A preferred stock and 18,649 shares of common stock at exercise prices per share of $2.39 and $3.42, respectively. Komasta Properties, Ltd.'s address is 21 Sderot Shaul Hamelech, Tel Aviv, 64367, Israel.

(10) Zeiss' address is 1 Zeiss Drive, Thornwood, New York 10594.

(11) Mr. Waggoner's address is 234 Lytton Avenue, Pittsburgh, Pennsylvania 15213.

55

DESCRIPTION OF CAPITAL STOCK

GENERAL

In accordance with our amended and restated certificate of incorporation, we are authorized to issue up to 176,600,000 shares of common stock, par value $.01 per share, and 17,660,000 shares of undesignated preferred stock, par value $.01 per share. As of March 31, 2000 there were 13,579,170 shares of common stock outstanding held by 23 stockholders of record, and no shares of preferred stock were outstanding.

The following summary description of our capital stock is not intended to be complete and is qualified by reference to the provisions of applicable law and to our amended and restated certificate of incorporation and our bylaws, filed as exhibits to the registration statement of which this prospectus is a part.

COMMON STOCK

Based on the number of shares outstanding as of March 31, 2000, and giving effect to the issuance of the 6,000,000 shares of common stock offered pursuant to this prospectus, there will be 19,579,170 shares of common stock outstanding upon completion of this offering. This includes the conversion of all outstanding shares of Series A preferred stock and Series B preferred stock upon the consummation of this offering. In addition, as of March 31, 2000, there were outstanding stock options to purchase 1,762,581 shares of common stock.

The holders of our common stock are entitled to one vote for each share held of record upon such matters and in such manner as may be provided by law. Subject to preferences applicable to any outstanding shares of preferred stock, the holders of common stock are entitled to receive ratably dividends, if any, as may be declared by the board of directors out of funds legally available for dividend payments. In the event we liquidate, dissolve or wind up, the holders of common stock are entitled to share ratably in all assets remaining after payment of liabilities and liquidation preferences of any outstanding shares of the preferred stock. Holders of common stock have no preemptive rights, or rights to convert, their common stock into any other securities. There are no redemption or sinking fund provisions applicable to the common stock. All outstanding shares of common stock are fully paid and nonassessable.

PREFERRED STOCK

We have no present plans to issue any additional shares of preferred stock. However, the preferred stock is issuable from time to time in one or more series and with such designations, preferences and other rights for each series as shall be stated in the resolutions providing for the designation and issue of each such series adopted by our board of directors. Our board of directors is authorized by our amended and restated certificate of Incorporation to determine, among other things, the voting, dividend, redemption, conversion, exchange and liquidation powers, rights and preferences and the limitations thereon pertaining to such series. Our board of directors, without stockholder approval, may issue preferred stock with voting and other rights that could adversely affect the voting power of the holders of the common stock and that could have certain anti-takeover effects. The ability of our board of directors to issue preferred stock without stockholder approval could have the effect of delaying, deferring or preventing a change in control of us or the removal of existing management.

56

WARRANTS

As of December 31, 1999, the following warrants for the purchase of equity securities were outstanding:

                                                                     NUMBER OF SHARES
                                                                     OF COMMON STOCK
                                                                        FOR WHICH        PER SHARE
                                                                        WARRANT IS       EXERCISE
                                                 EXPIRATION DATE       EXERCISABLE         PRICE
                                                -----------------    ----------------    ---------
Common stock warrants issued January 21,
  1998........................................   January 21, 2002         628,470          $1.87
Common stock warrants issued January 21,
  1998........................................   January 20, 2003         314,235           1.59
Series A preferred stock purchase warrant
  issued January 21, 1998.....................      June 18, 2002          15,710           1.59
Series A preferred stock purchase warrant
  issued January 21, 1998.....................      July 31, 2002         188,542           2.39
Common stock subscription warrant issued June
  30, 1999(1).................................      June 30, 2004         114,790           1.87
Common stock subscription warrant issued
  August 30, 1999(1)..........................    August 30, 2004           1,515           1.87
Common stock subscription warrant issued
  October 4, 1999(1)..........................    October 4, 2004           1,335           1.87
Common stock subscription warrant issued
  December 14, 1999(1)........................  December 14, 2004           1,187           1.87


(1) These warrants may be exercised for a reduced number of shares without making a cash payment.

Each warrant provides for adjustment of the exercise price and the number of securities issuable upon exercise of the warrant in the event of a reorganization of our capital structure or a stock split. In addition, the exercise price and number of shares issuable upon exercise of the warrants for the purchase of 1,575,166 shares of common stock will be adjusted if we issue stock at prices below the exercise price of such warrants. These rights for readjustment will terminate on the closing of this offering. Finally, we have granted the holders of the warrants for the purchase of 1,142,104 shares of common stock rights to register the common stock issuable upon exercise of the warrants.

ANTI-TAKEOVER EFFECTS OF VARIOUS PROVISIONS OF DELAWARE LAW AND OUR AMENDED AND RESTATED CERTIFICATE OF INCORPORATION AND BYLAWS

Section 203 of the Delaware General Corporation Law. We are subject to
Section 203 of the Delaware General Corporation Law, which regulates corporate acquisitions. In general, Section 203 prohibits a publicly-held Delaware corporation from engaging in a "business combination" with an "interested stockholder" for a period of three years following the date the person became an interested stockholder, unless:

- before the date of the business combination, the transaction is approved by our board of directors of the corporation;

- upon consummation of the transaction that resulted in the stockholder's becoming an interested stockholder, he or she owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced; or

- on or subsequent to such date, the business combination is approved by our board of directors and authorized at an annual or special meeting of stockholders by the affirmative vote of at least 66 2/3% of the corporation's voting stock not owned by the interested stockholder.

A "business combination" includes a merger, sale of assets or stock, or other transaction resulting in a financial benefit to the interested stockholder. In general, an "interested stockholder" is a person who, together with affiliates and associates, owns, or within three years prior to the determination of interested

57

stockholder status, did own, 15% or more of a corporation's voting stock. This statute could prohibit or delay the accomplishment of mergers or other takeover or change of control attempts with respect to us and, accordingly, may discourage attempts to acquire our company.

In addition, various provisions of our amended and restated certificate of incorporation, our bylaws and our 2000 Stock Plan, which provisions will be in effect immediately after the completion of this offering and are summarized in the following paragraphs, may be deemed to have an anti-takeover effect and may delay, defer or prevent a tender offer or takeover attempt that a stockholder might consider in its best interest, including those attempts that might result in a premium over the market price for the shares held by stockholders.

Classified Board of Directors. Our bylaws provide that, effective upon the closing of this offering, the terms of office of the members of our board of directors will be divided into three classes: Class A, whose term will expire at the annual meeting of stockholders to be held in 2001, Class B, whose term will expire at the annual meeting of stockholders to be held in 2002, and Class C, whose term will expire at the annual meeting of stockholders to be held in 2003. At each annual meeting of stockholders after the initial classification, the successors to directors whose term will then expire will be elected to serve from the time of election and qualification until the third annual meeting following election. Our bylaws permit our board of directors to increase or decrease the size of our board of directors. Any additional directorships resulting from an increase in the number of directors will be distributed among the three classes so that, as nearly as possible, each class will consist of one-third of the total number of directors. Our amended and restated certificate of incorporation requires the affirmative vote of holders of 80% of the issued and outstanding shares of common stock entitled to vote for the election of directors to remove any director or the entire board of directors. Under Delaware law, our directors can only be removed for "cause." This removal provision and the classification of our board of directors may have the effect of delaying or preventing changes in control or our management.

Amendment of Bylaws. Under our amended and restated certificate of incorporation, the affirmative vote of the holders of at least 80% of the voting power of all outstanding shares of our capital stock of Cellomics shall be required to adopt, amend or repeal any provision of our bylaws.

Prohibition on Written Consents. Under our amended and restated certificate of incorporation, upon the closing of this offering, our stockholders may not take action by written consent.

Limitations on Special Meetings. Under our amended and restated certificate of incorporation, upon the closing of this offering, special meetings of stockholders may be called only by our president, the chairman of our board of directors or a majority of our board of directors. Also, business transacted at any special meeting must be limited to matters relating to the purposes set forth in the notice of such special meeting.

Board Discretion in Decision Making. Under our amended and restated certificate of incorporation, our board of directors, when evaluating an offer related to a tender offer or other business combination, is authorized to give due consideration to any relevant factors, including the social, legal and economic effects upon employees, suppliers, customers, creditors, the community in which we conduct business, and the economy of the state, region and nation.

Limitations on Amending Director Liability Limitation. Under our amended and restated certificate of incorporation, the affirmative vote of at least 80% of the voting power of all outstanding shares of our capital stock shall be required to amend the limitations on liability of directors contained in our amended and restated certificate of incorporation.

Acceleration of Options on Change of Control. Under our 2000 Stock Plan, in the event of certain mergers, a reorganization or consolidation of Cellomics with or into another corporation or the sale of all or substantially all of our assets or all of our capital stock wherein the successor corporation does not assume outstanding options or issue equivalent options, our board of directors is required to accelerate vesting of options outstanding.

58

REGISTRATION RIGHTS

After the completion of this offering, the holders of approximately 10,100,150 shares of common stock held by purchasers of our preferred stock and approximately 1,142,104 shares of common stock issuable upon conversion of outstanding warrants will be entitled to rights to register these shares under the Securities Act of 1933. Under the terms of the Series A Preferred Stock and Warrant Purchase Agreement dated January 31, 1998, and the Series B Preferred Stock Purchase Agreement dated February 23, 2000, whenever we propose to file a registration statement under the Securities Act, the holders of registrable securities are entitled to notice of the registration and have the right, subject to limitations that the underwriters may impose on the number of shares included in the registration, to include their registrable shares in the registration.

Additionally, beginning after January 1, 2001, stockholders who acquired their shares of common stock upon conversion of our Series A preferred stock and warrants issued in connection with our Series A financing have the right, upon request by more than 50% of them, to require us to file a registration statement covering their registrable securities on Forms S-1 or S-2 or any other applicable form. Also, stockholders who acquired their shares upon conversion of our Series B preferred stock or the exercise of warrants issued in connection with our Series B financing have the right, upon request by more than 50% of them, to require us to file a registration statement covering their registrable shares on Forms S-1 or S-2 or any other applicable form. Under these rights, each series of registrable shares can require us to register their shares if the proposed public offering price of the shares held by those requesting registration is at least $10,000,000. These registration rights are exercisable only once per series if all registered securities are sold. We have also provided that each of Series A and Series B stockholders have two additional demand registration rights to register their shares on Form S-3 for each series. These rights are limited to shares having an excess market value of $500,000. We have also provided both of these series of holders incidental registration rights which apply when our company or other stockholders register shares. We will pay expenses for the demand registration and the two registrations on Form S-3 for each registrable series, and for the incidental registrations for each series.

The agreement provides that, in connection with our initial public offering, each stockholder agrees not to sell or otherwise dispose of any securities without the prior written consent of us or the underwriters for a period of up to 180 days if all other parties having registration rights and all members of our board and our officers agree to be similarly restricted. The rights of the holders of registrable shares terminate upon the earlier of five years from the date of the closing of this offering or as to any single holder on the date when all of that holder's registrable securities may be sold within a three month period under Rule 144 of the Securities Act.

LISTING

Application has been made to include our common stock for quotation in the Nasdaq National Market under the symbol "CLMX."

TRANSFER AGENT AND REGISTRAR

The transfer agent and registrar for the common stock is American Stock Transfer & Trust Company.

59

SHARES ELIGIBLE FOR FUTURE SALE

Prior to this offering, there has been no public market for our common stock. Future sales of substantial amounts of common stock in the public market, or the perception that sales could occur, could adversely affect the market price of our common stock and our ability to sell equity securities.

Upon completion of this offering, we will have a total of 19,579,170 shares of common stock outstanding, or 20,479,170 shares if the underwriters exercise their over-allotment option in full. Of these shares, the 6,000,000 shares sold in the offering, or 6,900,000 shares if the underwriters exercise their over- allotment option in full, will be freely tradable unless they are purchased by our "affiliates," under the Securities Act. The remaining 13,579,170 outstanding shares are "restricted," which means they were originally sold in offerings that were not subject to a registration statement filed with the Securities and Exchange Commission. These restricted shares may be resold only through registration under the Securities Act unless an exemption from registration is available, such as the exemption afforded by Rule 144.

The following table indicates approximately when 13,579,170 shares of our common stock that are not being sold in the offering but which were outstanding as of March 31, 2000 will be eligible for sale into the public market:

 NUMBER OF
   SHARES               AVAILABILITY FOR RESALE INTO PUBLIC MARKET
------------   ------------------------------------------------------------
  11,129,110   180 days after the date of this prospectus due to lock-up
               agreements substantially all of our stockholders have
               entered into with Prudential Securities Incorporated (except
               35,320 shares eligible for resale on the date of this
               prospectus)
   2,450,060   Between 180 and 365 days after the date of this prospectus
               due to requirements of the federal securities laws.

We, our directors and officers and stockholders have entered into lock-up agreements under which we and they have agreed not to offer or sell any shares of common stock or securities convertible into or exchangeable or exercisable for shares of common stock for a period of 180 days after the date of this prospectus without the prior written consent of Prudential Securities Incorporated, on behalf of the underwriters. Prudential Securities Incorporated may at any time and without notice, waive any of the terms of these lock-up agreements specified in the Underwriting Agreement.

Generally, Rule 144 as currently in effect provides that, beginning 90 days after the first date of this prospectus, a person who has beneficially owned shares of our common stock for at least one year would be entitled to sell within any three-month period, a number of shares that does not exceed the greater of:

- 1% of the number of shares of common stock then outstanding, which, based on the shares of outstanding as of March 31, 2000 will equal approximately 195,792 shares; or

- the average weekly trading volume of the common stock on the Nasdaq National Market during the four calendar weeks preceding the filing of the notice on Form 144 with respect to the sale.

Rule 144 provides limitations in the manner of sales and imposes requirements as to notice and the availability of current public information about us.

Under Rule 144(k), a person who has not been one of our affiliates at any time during the 90 days preceding a sale, and who has beneficially owned the shares proposed to be sold for at least two years, may sell his or her shares without complying with the manner of the sale, public information, volume limitation or notice provisions of Rule 144. Therefore, unless otherwise restricted, a person who has been a non-affiliate for at least two years may sell his or her shares in the open market immediately after the lock-up agreements expire.

Rule 701 permits any of our employees, officers, directors or consultants who purchased their shares under a compensatory stock or option plan or other written agreement prior to the effective date of this offering to sell such shares under Rule 144 without complying with the holding period, public information, volume limitation or notice requirements of Rule 144. All holders of Rule 701 shares may not sell their

60

Rule 701 shares until 90 days after the date of this prospectus. However, substantially all shares of our common stock issued under Rule 701 are subject to lock-up agreements described above.

Shortly following the date of this prospectus, we intend to file a registration statement on Form S-8 under the Securities Act covering shares of our common stock reserved for issuance under our stock option plans. Shares registered under this registration statement will, subject to Rule 144 volume limitations applicable to our affiliates, be available for sale in the open market immediately after the lock-up agreements expire. As of March 31, 2000, an aggregate of 1,762,581 shares of common stock were subject to outstanding options.

As of the close of this offering, holders of 10,100,150 shares of common stock and warrants exercisable to purchase 1,142,104 shares of common stock will be entitled to certain rights with respect to the registration of those shares under the Securities Act. After these shares are registered, they will be freely tradable. For a description of these rights, see "Description of Capital Stock."

61

UNDERWRITING

We have entered into an underwriting agreement with the underwriters named below for whom Prudential Securities Incorporated, ING Barings LLC and Dain Rauscher Incorporated are acting as representatives. We are obligated to sell, and the underwriters are obligated to purchase, all of the shares offered on the cover page of this prospectus, if any are purchased. Subject to certain conditions of the underwriting agreement, each underwriter has severally agreed to purchase the shares indicated opposite its name:

                                                                NUMBER
                                                              OF SHARES
                        UNDERWRITERS                          ----------
                        ------------
Prudential Securities Incorporated..........................
ING Barings LLC.............................................
Dain Rauscher Incorporated..................................
                                                              ----------

     Total..................................................   6,000,000
                                                              ==========

The underwriters may sell more shares than the total number of shares offered on the cover page of this prospectus and they have, for a period of 30 days from the date of this prospectus, an over-allotment option to purchase up to 900,000 additional shares from us. If any additional shares are purchased, the underwriters will severally purchase the shares in the same proportion as per the table above.

The representatives of the underwriters have advised us that the shares will be offered to the public at the offering price indicated on the cover page of this prospectus. The underwriters may allow to selected dealers a concession not in excess of $ per share and such dealers may reallow a concession not in excess of $ per share to certain other dealers. After the shares are released for sale to the public, the representatives may change the offering price and the concessions.

We have agreed to pay to the underwriters the following fees, assuming both no exercise and full exercise of the underwriters' over-allotment option to purchase additional shares.

                                                                          TOTAL FEES
                                                       -------------------------------------------------
                                             FEE        WITHOUT EXERCISE OF         FULL EXERCISE OF
                                          PER SHARE    OVER-ALLOTMENT OPTION     OVER-ALLOTMENT OPTION
                                          ---------    ---------------------    ------------------------
Fees paid by us.........................  $                  $                          $

In addition, we estimate that we will spend approximately $1,250,000 in expenses for this offering. We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act, or contribute to payments that the underwriters may be required to make in respect of these liabilities.

We, our officers and directors and substantially all of our stockholders have entered into lock-up agreements under which we and they have agreed not to offer or sell any shares of common stock or securities convertible into or exchangeable or exercisable for shares of common stock for a period of 180 days from the date of this prospectus without the prior written consent of Prudential Securities Incorporated, on behalf of the underwriters. Prudential Securities Incorporated may, at any time and without notice, waive the term of these lock-up agreements specified in the underwriting agreement.

Prior to this offering, there has been no public market for the common stock of Cellomics. The public offering price, negotiated among us and the representatives, is based upon various factors such as our financial and operating history and condition, our prospects, the prospects for the industry we are in and prevailing market conditions.

62

Prudential Securities Incorporated, on behalf of the underwriters, may engage in the following activities in accordance with applicable securities rules:

- Over-allotments involving sales in excess of the offering size, creating a short position. Prudential Securities may elect to reduce this short position by exercising some or all of the over-allotment option.

- Stabilizing and short covering: stabilizing bids to purchase the shares are permitted if they do not exceed a specified maximum price. After the distribution of shares has been completed, short covering purchases in the open market may also reduce the short position. These activities may cause the price of the shares to be higher than would otherwise exist in the open market.

- Penalty bids permitting the representatives to reclaim concessions from a syndicate member for the shares purchased in the stabilizing or short covering transactions.

Such activities, which may be commenced and discontinued at any time, may be effected on the Nasdaq National Market, in the over-the-counter market or otherwise.

Each underwriter has represented that it has complied and will comply with all applicable laws and regulations in connection with the offer, sale or delivery of the shares and related offering materials in the United Kingdom, including:

- the Public Offers of Securities Regulations 1995;

- the Financial Services Act 1986; and

- the Financial Services Act 1986, (Investment Advertisements) (Exemptions) Order 1996 (as amended).

We have asked the underwriters to reserve shares for sale at the same offering price directly to our officers, directors, employees and other business affiliates or related third parties. The number of shares available for sale to the general public in the offering will be reduced to the extent such persons purchase the reserved shares.

Prudential Securities Incorporated facilitates the marketing of new issues online through its Prudential Securities.com division. Clients of Prudential Advisor(SM), a full service brokerage firm program, may view offering terms and a prospectus online and place orders through their financial advisors.

Some employees of Prudential Securities Incorporated indirectly own 19,058 shares of our Series B preferred stock. Under the rules of the National Association of Securities Dealers, Inc., these shares may not be offered or sold for a period of one year from the date of this prospectus.

LEGAL MATTERS

Certain legal matters with respect to the legality of the issuance of the shares of the common stock offered by this prospectus will be passed upon for us by Buchanan Ingersoll Professional Corporation, Pittsburgh, Pennsylvania. Certain legal matters in connection with this offering will be passed upon for the underwriters by Skadden, Arps, Slate, Meagher & Flom (Illinois), Chicago, Illinois.

EXPERTS

The financial statements as of December 31, 1998 and 1999 and for each of the three years in the period ended December 31, 1999 included in this Prospectus and the financial statement schedule included in the Registration Statement have been so included in reliance on the report of PricewaterhouseCoopers LLP, independent accountants, given on the authority of said firm as experts in auditing and accounting.

Certain legal matters with respect to the statements in this prospectus under the captions "Risk Factors--The rights we rely on to protect our intellectual property underlying our products may not be adequate, which could enable third parties to use our technology and would reduce our ability to compete in the market,"

63

"--Our success will depend partly on our ability to operate without infringing on or utilizing the proprietary rights of others" and "Business--Intellectual Property Rights" have been reviewed and approved by McDonnell Boehnen Hulbert & Berghoff, our patent counsel who are experts in these matters and are subject to an opinion to be rendered to the underwriters. We are including this information relying on their review and approval.

WHERE YOU CAN FIND MORE INFORMATION

We have filed with the SEC a registration statement on Form S-1 in connection with this offering. This prospectus does not contain all the information in the registration statement. In addition, upon completion of the offering, we will be required to file annual, quarterly and current reports, proxy statements and other information with the Securities and Exchange Commission. Whenever a reference is made in this prospectus to any contract or other document of ours, the reference may not be complete and you should refer to the exhibits that are a part of the registration statement for a copy of the contract or document.

The registration statement and the exhibits and schedules thereto may be inspected without charge at the Public Reference Room of the Commission at Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the regional offices of the Commission located at Seven World Trade Center, Suite 1300, New York, New York 10048 and Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661-2511. Copies of these documents may be obtained from the Public Reference Room of the Commission at prescribed rates. This material also may be obtained on the Commission's website at "http://www.sec.gov." Information regarding the operation of the Public Reference Room may be obtained by calling the Commission at 1(800) SEC-0330.

We intend to furnish our stockholders with annual reports containing our audited financial statements and make available quarterly reports containing unaudited financial information for the first three quarters of each year.

64

CELLOMICS, INC.

INDEX TO FINANCIAL STATEMENTS

Report of Independent Accountants...........................  F-2
Balance Sheets as of December 31, 1998 and 1999.............  F-3
Statement of Operations for the years ended December 31,
  1997, 1998 and 1999.......................................  F-4
Statement of Stockholders' Equity for the years ended
  December 31, 1997, 1998 and 1999..........................  F-5
Statement of Cash Flows for the years ended December 31,
  1997, 1998 and 1999.......................................  F-6
Notes to Financial Statements...............................  F-7

F-1

REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors
and Stockholders of
Cellomics, Inc.

The stock split described in the last paragraph of Note 14 to the financial statements has not been consummated at April 13, 2000. When it has been consummated, we will be in a position to furnish the following report.

"In our opinion, the accompanying balance sheets and the related statements of operations, of stockholders' equity, and of cash flows present fairly, in all material respects, the financial position of Cellomics, Inc. at December 31, 1998 and 1999, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 1999, in conformity with accounting principles generally accepted in the United States. These financial statements are the responsibility of the company's management; our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these financial statements in accordance with auditing standards generally accepted in the United States which require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for the opinion expressed above."

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania

March 3, 2000

F-2

CELLOMICS, INC.

BALANCE SHEETS
AS OF DECEMBER 31, 1998 AND 1999

                                                                                        DECEMBER 31, 1999
                                                             DECEMBER 31,                   PRO FORMA
                                                     -----------------------------        STOCKHOLDERS'
                                                        1998              1999           EQUITY (NOTE 1)
                                                     -----------      ------------      -----------------
                                                                                           (UNAUDITED)
ASSETS
Current assets:
     Cash and cash equivalents.................      $   662,454      $  1,341,333
     Accounts receivable (Note 3)..............        1,357,733         1,572,282
     Inventories...............................          335,500           224,536
     Prepaid expenses and other current
       assets..................................          105,267           335,221
                                                     -----------      ------------
Total current assets...........................        2,460,954         3,473,372
Property and equipment, net (Note 4)...........        1,501,790         2,386,555
                                                     -----------      ------------
Total assets...................................      $ 3,962,744      $  5,859,927
                                                     ===========      ============
LIABILITIES, MANDATORILY REDEEMABLE
  PREFERRED STOCK AND STOCKHOLDERS' EQUITY
Current liabilities:
     Accounts payable..........................      $   644,429      $  1,341,520
     Accrued expenses (Note 5).................        1,067,099           915,339
     Deferred revenue..........................          182,393           528,480
     Payable to related party (Note 11)........               --         1,000,000
     Current maturities of long-term debt (Note
       6)......................................          157,626           911,035
                                                     -----------      ------------
Total current liabilities......................        2,051,547         4,696,374
Long-term debt less current maturities (Note
  6)...........................................          653,180         3,744,546
Payable to related party (Note 11).............               --         1,000,000
                                                     -----------      ------------
Total liabilities..............................        2,704,727         9,440,920
                                                     -----------      ------------
Commitments and contingencies (Notes 7 and
  11)..........................................               --                --
Mandatorily redeemable convertible preferred
  stock (Note 9)...............................        6,252,356        12,152,654                  --
                                                     -----------      ------------         -----------
Stockholders' equity (deficit):
     Common stock, $.01 par value; 17,660,000
       shares authorized in 1998 and 1999;
       21,192,000 shares authorized, pro forma;
       4,076,670 and 4,183,015 shares issued
       and outstanding in 1998 and 1999;
       11,129,109 shares issued and outstanding
       pro forma...............................           40,767            41,830             111,291
     Additional paid-in capital................        1,667,537         3,263,298          14,027,699
     Deferred compensation (Note 9)............         (188,102)       (1,906,431)         (1,906,431)
     Accumulated deficit.......................       (6,514,541)      (17,132,344)        (17,132,344)
                                                     -----------      ------------         -----------
Total stockholders' equity (deficit)...........       (4,994,339)      (15,733,647)         (4,899,785)
                                                     -----------      ------------         ===========
Total liabilities, mandatorily redeemable
  preferred stock and stockholders' equity.....      $ 3,962,744      $  5,859,927
                                                     ===========      ============

The accompanying notes are an integral part of these financial statements

F-3

CELLOMICS, INC.

STATEMENT OF OPERATIONS
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

                                                      1997             1998              1999
                                                   -----------      -----------      ------------
Revenues:
    Product sales............................      $        --      $        --      $  1,350,041
    Development and collaboration agreement
       and grant revenues....................          394,935        2,273,082         2,040,410
                                                   -----------      -----------      ------------
         Total revenues                                394,935        2,273,082         3,390,451
                                                   -----------      -----------      ------------
Operating costs and expenses:
    Costs of product sales (including related
       party amounts of $0, $0, and $100,697;
       see Note 11)..........................               --               --           404,785
    Research and development (including
       related party amounts of $0, $0, and
       $2,165,334; see Note 11)..............        1,486,156        3,948,309         9,509,177
    Selling, general and administrative
       (including related party amounts of
       $10,809, $168,998 and $110,617; see
       Note 11)..............................        1,334,014        1,834,044         3,933,687
                                                   -----------      -----------      ------------
         Total operating costs and
           expenses..........................        2,820,170        5,782,353        13,847,649
                                                   -----------      -----------      ------------
Loss from operations.........................       (2,425,235)      (3,509,271)      (10,457,198)
Interest income (expense):
    Interest expense.........................          (37,950)         (43,944)         (302,040)
    Interest income..........................           25,309           58,555           141,435
                                                   -----------      -----------      ------------
Loss before income taxes.....................       (2,437,876)      (3,494,660)      (10,617,803)
Provision for income taxes (Note 8)..........               --               --                --
                                                   -----------      -----------      ------------
Net loss.....................................       (2,437,876)      (3,494,660)      (10,617,803)
Accrued dividends and accretion on
  mandatorily redeemable convertible
  preferred stock............................               --         (518,017)         (933,232)
                                                   -----------      -----------      ------------
Net loss attributable to common
  stockholders...............................      $(2,437,876)     $(4,012,677)     $(11,551,035)
                                                   ===========      ===========      ============
Net loss per share - basic and diluted (Note
  10)........................................      $     (0.61)     $     (0.99)     $      (2.77)
                                                   ===========      ===========      ============
Shares used to compute basic and diluted net
  loss per share.............................        3,986,392        4,069,726         4,174,835
                                                   ===========      ===========      ============
Pro forma net loss per share (Note 10).......                                        $      (0.97)
                                                                                     ============
Shares used to compute pro forma net loss per
  share......................................                                          10,989,999
                                                                                     ============

The accompanying notes are an integral part of these financial statements

F-4

CELLOMICS, INC.

STATEMENT OF STOCKHOLDERS' EQUITY
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

                                      COMMON STOCK       ADDITIONAL     DEFERRED                        TOTAL
                                   -------------------    PAID-IN        STOCK       ACCUMULATED    STOCKHOLDERS'
                                    SHARES     AMOUNT     CAPITAL     COMPENSATION     DEFICIT         EQUITY
                                   ---------   -------   ----------   ------------   ------------   -------------
  Balance at January 1, 1997.....  3,986,392   $39,864   $1,927,113   $        --    $   (582,005)  $  1,384,972
Net loss.........................         --        --           --            --      (2,437,876)    (2,437,876)
                                   ---------   -------   ----------   -----------    ------------   ------------
  Balance at December 31, 1997...  3,986,392    39,864    1,927,113            --      (3,019,881)    (1,052,904)
Issuance of common stock for
  anti-dilution rights...........     90,278       903         (903)           --              --             --
Issuance of stock options to
  employees......................         --        --      259,344      (259,344)             --             --
Amortization of deferred
  compensation...................         --        --           --        71,242              --         71,242
Dividends and accretion accrued
  on mandatorily redeemable
  convertible preferred stock....         --        --     (518,017)           --              --       (518,017)
Net loss.........................         --        --           --            --      (3,494,660)    (3,494,660)
                                   ---------   -------   ----------   -----------    ------------   ------------
  Balance at December 31, 1998...  4,076,670    40,767    1,667,537      (188,102)     (6,514,541)    (4,994,339)
Issuance of common stock for
  anti-dilution rights...........    106,345     1,063       (1,063)           --              --             --
Issuance of stock purchase
  warrants.......................         --        --      121,847            --              --        121,847
Issuance of stock options to
  employees......................         --        --    2,408,209    (2,408,209)             --             --
Amortization of deferred
  compensation...................         --        --           --       689,880              --        689,880
Dividends and accretion accrued
  on mandatorily redeemable
  convertible preferred stock....         --        --     (933,232)           --              --       (933,232)
Net loss.........................         --        --           --            --     (10,617,803)   (10,617,803)
                                   ---------   -------   ----------   -----------    ------------   ------------
  Balance at December 31, 1999...  4,183,015   $41,830   $3,263,298   $(1,906,431)   $(17,132,344)  $(15,733,647)
                                   =========   =======   ==========   ===========    ============   ============

The accompanying notes are an integral part of these financial statements

F-5

CELLOMICS, INC.

STATEMENT OF CASH FLOWS
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

                                                            1997             1998              1999
                                                         -----------      -----------      ------------
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net loss.........................................      $(2,437,876)     $(3,494,660)     $(10,617,803)
  Adjustments to reconcile net loss to net cash
     used in operating activities:
       Depreciation and amortization...............           79,475          143,487           486,008
       Amortization of deferred compensation.......               --           71,242           689,880
     Increase (decrease) in cash from changes in:
       Accounts receivable.........................          158,722       (1,357,733)         (214,549)
       Inventories.................................         (119,770)        (215,730)         (147,036)
       Prepaid expenses and other current assets...          (33,045)         (67,473)         (241,711)
       Accounts payable and accrued expenses.......          538,644          883,600           545,331
       Payable to related party....................               --               --         2,000,000
       Deferred revenue............................          450,000         (267,607)          346,087
                                                         -----------      -----------      ------------
          Net cash used in operating activities....       (1,363,850)      (4,304,874)       (7,153,793)
                                                         -----------      -----------      ------------
CASH FLOWS FROM INVESTING ACTIVITIES:
     Capital expenditures..........................         (205,421)      (1,377,681)       (1,070,554)
                                                         -----------      -----------      ------------
          Net cash used in investing activities....         (205,421)      (1,377,681)       (1,070,554)
                                                         -----------      -----------      ------------
CASH FLOWS FROM FINANCING ACTIVITIES:
     Proceeds from sale of mandatorily redeemable
       convertible preferred stock.................               --        5,214,788         4,967,066
     Proceeds from issuance of convertible notes
       and stock purchase warrants.................          500,000               --         1,800,000
     Borrowings under term note and equipment
       financing facilities........................               --          879,762         2,415,952
     Repayment of term note and equipment financing
       facilities borrowings.......................               --          (68,956)         (279,792)
                                                         -----------      -----------      ------------
          Net cash provided by financing
            activities.............................          500,000        6,025,594         8,903,226
                                                         -----------      -----------      ------------
Net increase (decrease) in cash and cash
  equivalents......................................       (1,069,271)         343,039           678,879
CASH AND CASH EQUIVALENTS:
     Beginning of year.............................        1,388,686          319,415           662,454
                                                         -----------      -----------      ------------
     End of year...................................      $   319,415      $   662,454      $  1,341,333
                                                         ===========      ===========      ============
SUPPLEMENTAL CASH FLOW INFORMATION:
     Cash paid for interest........................      $        --      $    17,487      $    252,794
                                                         ===========      ===========      ============
NON-CASH FINANCING ACTIVITIES:
     Conversion of notes to mandatorily redeemable
       convertible preferred stock.................      $        --      $   519,550      $         --
                                                         ===========      ===========      ============
     Dividends and accretion on mandatorily
       redeemable convertible preferred stock......      $        --      $   518,017      $    933,232
                                                         ===========      ===========      ============

The accompanying notes are an integral part of these financial statements

F-6

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

1. ORGANIZATION AND BASIS OF PRESENTATION

Organization

Cellomics, Inc. (the "Company" or "Cellomics") was incorporated in Delaware on January 16, 1998 as the successor company to BioDx Inc. which was formed on May 3, 1995. Cellomics is in the business of extending the power of genomics and proteomics by defining the cellular functions of genes and proteins in order to make life sciences research, including drug discovery, more productive and cost effective. Cellomics offers an array of products designed to seamlessly integrate the generation of data to the extraction of information, and ultimately create cellular knowledge. Cellomics generates cellular data using its proprietary portfolio of instruments, assays and reagents. The data generated is then stored, managed and analyzed using its proprietary information products. Cellomics uses its information products, coupled with internally and externally generated informatics, to build a virtual cell which maps the complex interactive network of cellular components and their interactions, thereby generating knowledge. Cellomics knowledge products aim to systematize, in a searchable, electronic format, our continuously evolving understanding of cellular biology.

The Company will require additional financing to fund currently planned operating levels in 2000. On February 23, 2000, the Company received $6.5 million in cash from the sale of Series B Mandatorily Redeemable Convertible Preferred Stock ("Series B Preferred Stock") and exchanged $1.8 million of convertible notes, plus accrued interest, for Series B Preferred Stock (see Note 14). In the event an initial public offering of common stock is not completed as planned (see Note 14), management will pursue a number of alternative sources to secure their funding. These alternatives include additional private placements of equity or debt securities or strategic equity investments. In addition, certain Series A preferred stockholders have committed to provide funding of up to $2.0 million. In the event that these sources are not sufficient or available when needed, management will curtail certain activities, including various research and development programs.

Unaudited Pro Forma Balance Sheet

As described in Note 14, the Company plans to complete an initial public offering of common stock during the second quarter of 2000. If the initial public offering is consummated as presently anticipated, all shares of Series A and Series B preferred stock (see Notes 9 and 14) will automatically convert into an equal number of shares of common stock. The unaudited pro forma balance sheet reflects the subsequent conversion of Series A preferred stock into common stock as if such conversion had occurred as of December 31, 1999. The unaudited pro forma balance sheet does not include the sale of Series B preferred stock in February 2000 for gross proceeds of $6.5 million or the simultaneous conversion of $1.8 million of convertible demand notes, plus accrued interest, into Series B preferred stock.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Cash and Cash Equivalents

Highly liquid investments with an original maturity of 90 days or less are classified as cash equivalents. The Company's cash and cash equivalents are maintained in deposit accounts, certificates of deposit and money market accounts.

Concentrations of Credit Risks

Substantially all of the Company's cash and cash equivalents are maintained at one financial institution.

F-7

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

The Company's accounts receivable are primarily from the United States government and pharmaceutical customers located in the United States and the United Kingdom. During fiscal years 1997, 1998 and 1999, approximately 97%, 60% and 93%, respectively, of revenues was concentrated with three customers in 1997 and 1998 and four customers in 1999. At December 31, 1999, amounts due from three customers represented 95% of gross trade receivables.

Inventories

Inventories, which consist primarily of microscope and camera components used in the Company's high content screening instrumentation platform, are stated at the lower of average cost or market.

Income Taxes

Deferred income taxes are recorded using the liability method. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect in the years in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized.

Property and Equipment

Property and equipment is carried at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, generally ranging from three years for software and up to seven years for furniture and fixtures. Repairs and maintenance are charged to expense as incurred.

Certain laboratory and computer equipment used by the Company could be subject to technological obsolescence in the event that significant advancement is made in competing or developing equipment technologies. Management continually reviews the estimated useful lives of technologically sensitive equipment and believes that those estimates appropriately reflect the current useful life of its assets. In the event that a currently unknown significantly advanced technology became commercially available, the Company would re-evaluate the value and estimated useful lives of its existing equipment, possibly having a material impact on the financial statements.

The Company periodically reviews all long-lived assets for impairment. Assets are written down to the fair market value when the carrying costs exceed the gross undiscounted cash flows expected to be generated by such assets. To date, there have been no asset impairments that would warrant a write-down.

Revenue Recognition

Revenue from product sales is recognized upon shipment of the product to the customer. Revenue from service contracts are recorded as deferred service contract revenues and reflected in product revenues over the term of the contract, generally one year.

The Company recognizes development and collaboration agreement and grant revenues on a straight-line basis over the contract period or as work is performed. Billings, and revenue recognition, under the Company's collaboration and grant arrangements generally coincide with the work performed and costs incurred. However, when payment for revenues under these agreements is received in advance of the services performed, the company records deferred revenue related to these agreements. Revenue recognized under collaboration agreements and grants are non-refundable.

In connection with some development and collaboration agreements, prototype products are also sold to customers. Such prototypes are priced separately from the underlying development and collaboration

F-8

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

agreements. Revenue related to the prototype is recognized when the prototype is shipped to the customer in accordance with the collaboration agreement and is included in development and collaboration agreement and grant revenue.

Advertising

Media placement costs are expensed in the month that the advertising appears. Total advertising expenses were $118,616 in 1999. No advertising costs were incurred in 1997 and 1998.

Research and Development

Research and development costs are expensed as incurred.

Software Development Costs

Software development costs incurred subsequent to the establishment of technological feasibility are capitalized in accordance with Statement of Financial Standards ("SFAS") No. 86, "Accounting for the Costs of Computer Software to Be Sold, Leased, or Otherwise Marketed." Amortization of capitalized software development costs is the greater of the amount computed using (a) the ratio of current revenues to the total of current and anticipated future revenues or (b) the straight-line method over the estimated economic life of the product. To date, the period of time, and accordingly, costs incurred between the achievement of technological feasibility and availability for general release, are not significant. As such, no amounts have been capitalized to date.

In March 1998, the AICPA issued Statement of Position 98-1, "Accounting for the Cost of Computer Software Developed or Obtained for Internal Use" ("SOP 98-1"). SOP 98-1 requires entities to capitalize certain costs related to internal use software once certain criteria have been met. The Company adopted the provisions of SOP 98-1 on January 1, 1999. To date, the Company has not capitalized any costs related to internal use software.

Stock-Based Compensation

As permitted by the provisions of SFAS No. 123, "Accounting for Stock-Based Compensation" (SFAS No. 123), the Company has elected to measure stock-based compensation under the provisions of Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to Employees" (APB No. 25), and to adopt the disclosure-only alternative described in SFAS No. 123. For stock options granted at exercise prices less than fair value, the Company records deferred stock-based compensation. Such deferred stock-based compensation is amortized over the vesting period of each individual award using the accelerated basis in accordance with Financial Accounting Standards Board ("FASB") Interpretation No. 28.

Foreign Currency

Foreign currency transaction gains and losses are included in other income in the statement of operations during the period in which they arise.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements.

F-9

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

Estimates also affect the amounts of revenues and expenses during the reported periods. Actual results could differ from the estimates.

Comprehensive Income (Loss)

During 1997, 1998, and 1999, the Company had no other comprehensive income items. Accordingly, the comprehensive loss for each of these periods is equal to the net loss.

Recent Accounting Pronouncements

In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative Instruments and Hedging Activities," which provides a comprehensive and consistent standard for the recognition and measurement of derivatives and hedging activities. Under the statement, every derivative is recorded in the balance sheet as either an asset or liability measured at its fair value. The statement requires that changes in the fair value of a derivative be recognized currently in earnings unless specific hedge accounting criteria are met. SFAS No. 133 is effective for fiscal years beginning after June 15, 2000 and is not anticipated to have a material impact on our results of operations or financial position.

3. ACCOUNTS RECEIVABLE

Accounts receivable consisted of:

                                                                    DECEMBER 31,
                                                              ------------------------
                                                                 1998          1999
                                                              ----------    ----------
Product receivables.........................................  $       --    $1,233,995
Development and collaboration agreement receivables.........     919,338            --
Grant receivables...........................................     438,395       338,287
                                                              ----------    ----------
                                                              $1,357,733     1,572,282
                                                              ==========    ==========

4. PROPERTY AND EQUIPMENT

Property and equipment consisted of:

                                                                    DECEMBER 31,
                                                              ------------------------
                                                                 1998          1999
                                                              ----------    ----------
Computer equipment and software.............................  $  471,672    $  930,930
Laboratory equipment........................................   1,172,083     1,894,762
Furniture and fixtures......................................     137,152       208,820
Leased assets and leasehold improvements....................          --        74,950
                                                              ----------    ----------
     Property and equipment, cost...........................   1,780,907     3,109,462
Less: accumulated depreciation..............................     279,117       722,907
                                                              ----------    ----------
     Net property and equipment.............................  $1,501,790    $2,386,555
                                                              ==========    ==========

During 1999, $258,000 of inventory was transferred to property and equipment.

F-10

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

5. ACCRUED EXPENSES

Accrued expenses consisted of:

                                                                   DECEMBER 31,
                                                              ----------------------
                                                                 1998         1999
                                                              ----------    --------
Incentive compensation and other employee costs.............  $  275,000    $422,081
Professional services.......................................     420,634      98,500
Due to subcontractors.......................................     158,986     191,119
Other.......................................................     212,479     203,639
                                                              ----------    --------
                                                              $1,067,099    $915,339
                                                              ==========    ========

6. LONG-TERM DEBT

Long-term debt consisted of:

                                                                   DECEMBER 31,
                                                              ----------------------
                                                                1998         1999
                                                              --------    ----------
Equipment financing line of credit - 1998...................  $810,806    $1,185,975
Equipment financing line of credit - 1999...................        --       209,277
Senior term loan............................................        --     1,499,523
Convertible notes payable to related parties................        --     1,708,615
Capital lease obligations...................................        --        52,191
                                                              --------    ----------
     Total long-term debt and capital lease obligations.....   810,806     4,655,581
     Less: current maturities...............................   157,626       911,035
                                                              --------    ----------
Long-term debt less current maturities......................  $653,180    $3,744,546
                                                              ========    ==========

On September 11, 1998, the Company entered into a $1.5 million non-revolving equipment financing line of credit agreement (the "1998 Equipment Financing Line"). Borrowings against the 1998 Equipment Financing Line can be in increments of not less than $75,000 in the form of a note and are collateralized by the equipment purchased. The notes are payable in 48 equal monthly installments with a 10% balloon payment at the end of the term and bear interest ranging from 12.7% to 12.9%. Borrowings under this facility are fully utilized.

On June 30, 1999, the Company entered into a $1.5 million Senior Term Debt Financing Facility (the "Term Debt Agreement") that is collateralized by all of the Company's assets except for $5.0 million of existing or future financed equipment. The borrowings may be used for working capital purposes and have a six-month interest-only period followed by 30 equal monthly installments of principal and interest. The note bears interest at 12.5%.

On July 21, 1999, the Company entered into a $3.0 million non-revolving equipment financing line of credit agreement (the "1999 Equipment Financing Line"). Borrowings against the 1999 Equipment Financing Line are collateralized by the equipment purchased. The notes are payable in 48 equal monthly installments. Available borrowings remaining under this facility at December 31, 1999 are $2,773,345. The notes bear interest ranging from 11.0% to 12.0%.

The scheduled maturities of the lines of credit, the senior term loan and the capital leases during each of the next five years are $911,035 in 2000, $1,036,262 in 2001, $839,623 in 2002, $160,046 in 2003 and $0 in 2004.

F-11

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

On November 30, 1999, certain Series A preferred stockholders loaned $1.8 million in convertible demand notes ("Convertible Demand Notes") to the Company. The Convertible Demand Notes bear interest at 10% per annum. In the event the Company completes a Qualified Financing (defined as the sale by the Company of $1,000,000 or more in convertible debt or equity securities), the Convertible Demand Notes plus any accrued interest convert into preferred stock at the price of the Qualified Financing. The Convertible Demand Notes are payable upon demand in the event the Company has not completed a Qualified Financing by April 1, 2000. In connection with the Convertible Demand Notes, the holders received common stock purchase warrants. The total proceeds of $1.8 million were allocated between the notes and the warrants based upon their relative fair values at the date of issuance. The resulting discount of $121,847 on the convertible notes is being amortized to interest expense over the period from November 30, 1999 to April 1, 2000. The convertible demand notes have been classified as long-term debt on the basis that they have been converted to Series B Preferred Stock on February 23, 2000 (see Note 14).

7. COMMITMENTS

The Company leases office space and office equipment under operating leases expiring through 2001. Total rent expense amounted to $95,758, $176,998 and $292,655 for 1997, 1998 and 1999, respectively. Minimum lease commitments for facilities and equipment at December 31, 1999 are as follows:

                                                              CAPITAL     OPERATING
YEAR                                                           LEASES      LEASES
----                                                          --------    ---------
2000........................................................  $ 20,405    $342,099
2001........................................................    20,329     173,981
2002........................................................    14,375          --
2003........................................................     9,176          --
2004........................................................        --          --
                                                              --------    --------
     Total minimum lease payments...........................  $ 64,285    $516,080
                                                                          ========
     Less: amounts representing interest....................   (12,094)
                                                              --------
     Present value of minimum capital lease payments........  $ 52,191
                                                              ========

The Company has other commitments in the ordinary course of business totaling approximately $375,000 during 2000.

8. INCOME TAXES

As of December 31, 1999, the Company had federal and state net operating loss carryforwards totaling approximately $15.5 million. The Company also had research and development tax credit carryforwards of approximately $725,000. The federal net operating loss and credit carryforwards will expire at various dates beginning in the year 2015 through 2019, if not utilized. The Commonwealth of Pennsylvania net operating losses will expire at various dates beginning in 2005 through 2009, if not utilized.

Utilization of the Company's net operating loss carryforwards and credits may be subject to an annual limitation due to the change in ownership provisions of the Internal Revenue Code of 1986 and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization.

F-12

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets for financial reporting and the amount used for income tax purposes. Significant components of the Company's deferred taxes for federal and state income taxes are as follows:

                                                                   DECEMBER 31,
                                                            --------------------------
                                                               1998           1999
                                                            -----------    -----------
Deferred tax assets (liabilities):
     Net operating loss carryforwards.....................  $ 2,719,358    $ 6,309,067
     Research and development credits.....................      282,995        725,060
     Other, net...........................................      (10,021)        72,534
                                                            -----------    -----------
Total deferred tax assets.................................    2,992,332      7,106,661
Valuation allowance.......................................   (2,992,332)    (7,106,661)
                                                            -----------    -----------
Net deferred tax assets...................................  $        --    $        --
                                                            ===========    ===========

The net valuation allowance increased by $1.9 million and $4.1 million for the fiscal years ended December 31, 1998 and 1999, respectively, principally due to the Company's operating losses. Management believes that there is sufficient uncertainty regarding the realization of deferred tax assets such that a full valuation allowance is appropriate.

9. MANDATORILY REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (ALL SHARE AND PER SHARE AMOUNTS STATED ON A POST-SPLIT EQUIVALENT BASIS, SEE NOTE 14)

Mandatorily Redeemable Convertible Preferred Stock

On January 8, 1998, the Company's board of directors authorized 7,150,534 shares of $.01 par value preferred stock.

On January 21, 1998, through a private placement offering, the Company, issued 3,477,222 shares of Series A Mandatorily Redeemable Convertible Preferred Stock ("Series A Preferred Stock") for gross proceeds of $5.5 million. Additionally, the holders of $500,000 of outstanding convertible notes converted the notes plus accrued interest of $19,550 for 326,523 shares of Series A Preferred Stock. On January 15, 1999, the Company received a second investment related to the January 21, 1998 private placement offering. The second investment resulted in the issuance of an additional 3,142,350 shares of Series A Preferred Stock for gross proceeds of $5 million. At December 31, 1998 and 1999, 3,803,745 and 6,946,095 shares, respectively, were outstanding.

Series A Preferred Stock is convertible into common stock on a one for one basis. Shares of Series A Preferred Stock have voting rights equal to common stock on an as-if-converted basis. Shares of Series A Preferred Stock are automatically converted into shares of common stock at the closing of an initial public offering at a price per share to the public of at least three times the original Series A Preferred Stock conversion price per share, as defined, and which results in gross proceeds to the Company of at least $15.0 million.

The Series A preferred stockholders are entitled to receive annual dividends at a rate equal to $0.1274 per annum per share. Dividends shall accrue on each share beginning on the date of issuance and shall be payable each January 1 for the period then ended. Dividends, which to date have not been declared or paid, may be settled either in cash, or in common stock at the option of the Company. At December 31, 1998 and 1999, cumulative dividends due Series A preferred stockholders were equal to $458,067 and $1.3 million, respectively. In addition, costs related to the issuance of the Series A Preferred Stock were recorded as a discount from the redemption value and are being accreted through periodic charges in a manner similar to the accrued dividends over the period up to the date of redemption. The cumulative

F-13

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

dividends and the accreted redemption value are included in the carrying amount of mandatorily redeemable convertible preferred stock.

Series A preferred stockholders are entitled to receive, upon liquidation, a distribution of $1.59 per share, the issuance price, plus any accrued dividends in preference to the Common stockholders. Thereafter, the remaining assets and funds, if any, shall be distributed ratably on a per share basis among all preferred and common stockholders.

At any time subsequent to January 21, 2003, the Company is required to redeem, upon written request from the holders of a majority of the then outstanding shares of Series A Preferred Stock, all of the outstanding shares of Series A Preferred Stock by paying in cash the sum of $1.59 per share, the issuance price, plus any accrued and unpaid dividends. Redemption occurs in four equal installments beginning on the initial date of redemption and three successive anniversary dates thereafter.

The Series A preferred stockholders have anti-dilution price protection and certain preemptive rights to participate in the issuance of new securities. These rights terminate upon conversion.

Common Stock

On January 8, 1998, the number of authorized shares of common stock was decreased from 353,200,000 to 17,660,000. On February 23, 2000, the number of authorized shares of common stock was increased to 21,192,000.

Carl Zeiss, Inc. ("Carl Zeiss"), an existing stockholder, received a total of 196,623 shares of common stock in 1998 and 1999 under anti-dilution rights acquired from a previous investment. Carl Zeiss has certain anti-dilution and registration rights similar to the Series A preferred stockholders.

Stock Purchase Warrants

In connection with the Series A private placement offering in 1998, the Company issued 628,470 common stock purchase warrants to the investors. The warrants are exercisable by the holders at any time at an exercise price of $1.87 per share. The warrants terminate at the earlier of January 21, 2002 or, under certain conditions, at the date of a qualified public offering. In addition, the Company issued 314,235 common stock purchase warrants to the private placement advisors, which may be exercised any time prior to the termination date of January 20, 2003 at an exercise price of $1.59 per share. The holders of the $500,000 convertible notes also received warrants to purchase 204,252 shares of preferred stock prior to the termination date of June 18, 2002 at exercise prices ranging from $1.87 to $2.39 per share, respectively. Based on the fair value of the underlying common stock compared to the exercise price of the related warrants, these warrants were determined to have no value.

In connection with the Convertible Demand Notes, the holders received warrants to purchase 289,624 shares of common stock. The warrants are exercisable by the holders at any time prior to the earlier of November 30, 2003, or, under certain conditions, at the date of a public offering of common stock. See Notes 6 and 14 for additional discussion of these warrants.

Stock Option Plan

On April 2, 1998, the Company adopted the Stock Plan (the "1998 Plan") under which 529,800 shares of the Company's common stock were reserved for issuance to directors, officers, consultants or employees of the Company, as approved by the board of directors. On July 17, 1998, February 15, 1999 and February 4, 2000, the 1998 Plan was amended and approved by the board of directors (and subsequently the stockholders) and the number of shares reserved for issuance was increased to

F-14

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

1,059,600, 1,518,760 and 2,578,360, respectively. The 1998 Plan, which expires in March 2003, provides for the grant of nonstatutory stock options, stock bonuses, stock appreciation rights and restricted stock purchase rights.

Options granted under the 1998 Plan are for ten-year terms. Exercise prices of the nonstatutory stock options are determined by the board of directors. Options under the 1998 Plan are generally subject to vesting in installments over a four-year period commencing on the grant date.

The following table summarizes activity under the Plan:

                                                            SHARES UNDER   WEIGHTED AVERAGE
                                                               OPTION       EXERCISE PRICE
                                                            ------------   ----------------
Outstanding at December 31, 1997..........................          --             --
  Granted.................................................     800,528          $0.16
  Exercised...............................................          --             --
  Canceled................................................          --             --
                                                             ---------
Outstanding at December 31, 1998..........................     800,528           0.16
  Granted.................................................     454,745           0.16
  Exercised...............................................          --             --
  Canceled................................................          --             --
                                                             ---------
Outstanding at December 31, 1999..........................   1,255,273           0.16
                                                             =========

Deferred compensation for options granted to employees is recorded when the exercise price of an option is less than the fair value of the underlying stock on the date of grant. Deferred compensation of $259,344 and $2.4 million was recorded on these options in 1998 and 1999, respectively. Deferred compensation is amortized to compensation expense on an accelerated basis.

In addition, in April 1998, the Company granted options to non-employees to purchase a total of 42,384 shares of common stock at an exercise price of $0.16 per share. Deferred compensation of $14,871 was recorded on these options, based on the estimated fair value of the options granted using the Black-Scholes model.

The Company has adopted the disclosure-only provisions of SFAS No. 123. Accordingly, compensation expense has been determined based on the intrinsic value of the options at the date of award. Had compensation cost for the 1998 Plan been determined based on the fair value of the options at the dates of grant, the impact on the Company's net loss for the years ended December 31, 1997, 1998 and 1999 would have been as follows:

                                                 1997           1998            1999
                                              -----------    -----------    ------------
Net loss:
  As reported...............................  $(2,437,876)   $(3,494,660)   $(10,617,803)
  Pro forma.................................   (2,437,876)    (3,500,368)    (10,632,516)
Earnings per share - basic and diluted:
  As reported...............................  $     (0.61)   $     (0.99)   $      (2.77)
  Pro forma.................................        (0.61)         (0.99)          (2.77)

The value of these options has been estimated on the date of grant using the Black-Scholes model under the minimum value method. The assumptions used in computing the minimum value of options granted during 1998 and 1999 were a risk-free interest rate of 5% and a weighted average expected life of each option of four years.

F-15

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

The weighted average fair value of the options granted, determined using the minimum value method, in 1998 and 1999 was $0.35 and $0.49, respectively. The weighted average remaining term of the options outstanding at December 31, 1999 was 8.8 years.

10. NET LOSS PER SHARE

The following table sets forth the computation of basic and diluted net loss per share:

                                                    YEAR ENDED DECEMBER 31,
                                   ----------------------------------------------------------
                                                                                     1999
                                      1997           1998            1999         PRO FORMA
                                   -----------    -----------    ------------    ------------
                                                                                 (UNAUDITED)
Numerator:
  Net loss.......................  $(2,437,876)   $(3,494,660)   $(10,617,803)   $(10,617,803)
  Less: preferred stock
    dividends....................           --       (518,017)       (933,232)             --
                                   -----------    -----------    ------------    ------------
  Net loss attributable to common
    stockholders.................  $(2,437,876)   $(4,012,677)   $(11,551,035)   $(10,617,803)
                                   ===========    ===========    ============    ============
Denominator:
  Weighted average shares -
    basic........................    3,986,392      4,069,726       4,174,835       4,174,835
  Dilutive potential common stock
    - Series A preferred stock...           --             --              --       6,815,164
  Dilutive potential common stock
    - options and warrants.......           --             --              --              --
                                   -----------    -----------    ------------    ------------
  Weighted average shares -
    diluted......................    3,986,392      4,069,726       4,174,835      10,989,999
                                   ===========    ===========    ============    ============
Basic and diluted net loss per
  share..........................  $     (0.61)   $     (0.99)   $      (2.77)   $      (0.97)
                                   ===========    ===========    ============    ============

Pro forma loss per share is computed assuming conversion of the Series A Preferred Stock outstanding at December 31, 1999 into common stock on a one for one basis on January 1, 1999 or the date of issuance if later. The Series A Preferred Stock will automatically convert to common stock upon the completion of an initial public offering (see Note 14).

For 1997, 1998 and 1999, 0, 3,755,039, and 7,491,743 shares, respectively, of potential common stock were excluded because their effect was anti-dilutive.

11. RELATED PARTY TRANSACTIONS

Zeiss

On April 14, 1998, the Company entered into an exclusive, worldwide, Co-Marketing, Manufacturing, Sales and Support and Development Agreement (the "Original Zeiss Agreement") with Carl Zeiss Jena GmbH ("Zeiss"), a stockholder, to deliver integrated screening systems and services for the optimization of the drug discovery process. As part of the Original Zeiss Agreement, Zeiss will manufacture a high content screening kinetics system exclusively for the Company using the Company's proprietary software. The Company is responsible for marketing, selling and servicing this high content screening system.

On February 3, 2000, a Development, Manufacturing and Supply Agreement (the "New Zeiss Agreement") was entered into between the Company and Zeiss which supersedes the Original Zeiss Agreement. This agreement principally provides for the manufacture and supply of products as described above for a five-year term, and includes provisions whereby the Company agrees to reimburse

F-16

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

Zeiss for an additional $2.0 million for development costs incurred by Zeiss through December 31, 1999. These amounts are to be repaid during 2000 and 2001 in equal installments of $1.0 million. The total of $2.0 million has been reflected in the balance sheet as a payable to related party. Additionally, the Company has capital expenditure commitments to Zeiss of $1.2 million during 2000.

On February 21, 2000 the Company and Zeiss entered into a sales and marketing agreement for ultra-high throughput screening products whereby the Company will be the exclusive dealer and distributor for high throughput and ultra-high throughput screening systems and related products in the United States and Canada through December 31, 2005.

The Company also purchases components from Zeiss for other products assembled by the Company. Total purchases for 1998 and 1999 approximated $160,500 and $317,000, respectively.

QED Imaging

On May 1, 1999, the Company entered into an agreement with QED Imaging ("QED"). The term of this agreement is one year. The agreement provides for monthly payments by the Company based upon services performed with the potential for a bonus, subject to satisfactory performance and completion of the milestones. Costs incurred under this contract which have been charged to research and development expense, amounted to $165,334 in 1999. A QED principal is a stockholder of the Company.

Other

A stockholder of the Company is a partner of a law firm that provides services to the Company. During 1997, 1998 and 1999, the services provided by his firm were $10,809, $168,998 and $110,617, respectively.

12. GRANTS

On March 9, 1998, the Company received a component of a five-year program project grant entitled Combinatorial Approaches for Novel Anticancer Agents. The Company, working as a subcontractor, will receive approximately $1.0 million of an approximately $4.2 million, five-year program project grant that is being funded by the National Cancer Institute Special Emphasis Panel.

On April 28, 1998, the Company received a Small Business Information Research grant for $700,000 over a two-year period from the National Institutes of Health to develop a cytotoxicity assay. Lawrence Livermore National Laboratory is a subcontractor.

On September 16, 1998, the Company entered into a $16.4 million Defense Advanced Research Project Agency ("DARPA") cost-sharing contract for the development of the CellChip System and the Fluorotox Database to detect toxins. During the first phase (September 13, 1998 through September 12, 2000) of the contract, the Company will receive $2.4 million from the government and provide matching funds of in-kind costs of $5.2 million. The matching funds of in-kind costs are primarily costs associated with other Company projects, which indirectly benefit the DARPA project. Through December 31, 1999, the Company has recognized $1.6 million in revenues of which $1.4 million has been received. The remaining $182,763 has been billed to the government and is recorded in accounts receivable. The Company has incurred $3.4 million of "in-kind" costs under the program which have been recorded as research and development expenses. Billings occur monthly based on the costs incurred and the stipulated percentage of total project costs representing the government's share.

The government has an option for a second phase (September 13, 2000 through September 13, 2002) of the contract. If the option is exercised, the Company will receive an additional $4.6 million during

F-17

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

phase II and will provide matching funds of in-kind costs of $4.2 million. The Company has hired subcontractors to perform services under this contract totaling $758,000 in phase I and, subject to the government exercising its option, $1.9 million in phase II.

Total grant revenues were $584,000 and $1.8 million in 1998 and 1999, respectively. There were no grant revenues in 1997. Included in research and development expenses in the statement of operations are direct costs of $545,646 and $1.7 million in 1998 and 1999, respectively.

13. EMPLOYEE BENEFITS

The Company maintains a defined contribution retirement savings plan covering substantially all employees and permits participants to make contributions by salary deduction pursuant to Section 401(k) of the Internal Revenue Code. Such amounts may be matched by the Company under certain conditions. Also, the Company may make, at its discretion, additional contributions to the plan. The Company did not make any contributions to the plan during 1997, 1998 or 1999.

14. SUBSEQUENT EVENTS

Series B Mandatorily Redeemable Convertible Preferred Stock Offering (share and per share amounts stated on a post-split equivalent basis, see "Stock Split" below)

On February 23, 2000, the Company issued 1,911,102 shares of Series B mandatorily redeemable convertible preferred stock for gross proceeds of $6.5 million. In addition, $1.8 million of Convertible Demand Notes, plus accrued interest of $41,868, converted by their original terms and conditions into 538,958 shares of Series B Preferred Stock. The holders of Series B Preferred Stock are entitled to receive annual dividends at a rate of 8.0%. The Series B Preferred Stock has substantially the same provisions as the Series A Preferred Stock, including the automatic conversion upon a qualified public offering (see Note 9). Based upon the estimated fair market value of the Company's common stock on commitment date, these securities contain a beneficial conversion feature. A deemed dividend of $6.5 million to the Series B preferred stockholders, which will increase basic net loss per share, will be recorded in the first quarter of 2000.

Also, in connection with the sale of the Series B Preferred Stock, the Company issued additional common stock purchase warrants to the convertible demand noteholders. The issuance of these warrants will result in an additional non-cash interest charge of $1.7 million related to the Convertible Demand Notes during the first quarter of 2000.

Initial Public Offering

On March 1, 2000, the Company's board of directors approved management's plans to file a registration statement for its initial public offering with the Securities and Exchange Commission in March 2000 and to complete its initial public offering during the second quarter of 2000. Anticipated proceeds from the initial public offering will be used to continue to fund the growth of the business. There is no assurance that the planned initial public offering will be successfully completed.

Supplemental Pro Forma Balance Sheet Data (unaudited)

The following summary pro forma balance sheet data illustrates the effect of the Series B Preferred Stock transactions and the conversion of the Series A and Series B preferred stock to common stock

F-18

CELLOMICS, INC.

NOTES TO FINANCIAL STATEMENTS (CONTINUED)
YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999

upon the closing of the initial public offering as if these transactions had occurred on December 31, 1999:

                                                      DECEMBER 31,    DECEMBER 31, 1999
                                                          1999            PRO FORMA
                                                      ------------    -----------------
                                                                         (UNAUDITED)
Cash................................................  $ 1,341,333        $ 7,872,196
Long-term debt less current maturities..............    3,744,546          2,035,931
Mandatorily redeemable convertible preferred
  stock.............................................   12,152,654                 --
Common stock........................................       41,830            135,792
Additional paid-in capital..........................    3,263,298         22,237,429

2000 Stock Plan

On March 1, 2000, the board of directors approved the 2000 Stock Plan (the "2000 Plan"). All options outstanding under the 1998 Plan continue in effect. The 2000 Plan provides for issuance of stock options to employees, directors and consultants. The total options authorized under the 1998 Plan and the 2000 Plan increased to 742,900. Under the 1998 Plan and the 2000 Plan, options to purchase 71,032 shares have been granted from January 1, 2000 through March 1, 2000. The issuance of these options will create a significant charge to deferred compensation in the first quarter of 2000.

Stock Split

On April 11, 2000 the board of directors approved a 3.532-for-1 stock split effective immediately prior to the initial public offering. All common stock and potential common stock share and per share data in these financial statements have been retroactively adjusted to reflect this change.

F-19

[PHOTOGRAPHS AND DESCRIPTIONS OF OUR CURRENT PRODUCTS]



Until , all dealers effecting transactions in these securities, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the obligation of dealers to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

CELLOMICS LOGO

PRUDENTIAL VECTOR HEALTHCARE

A UNIT OF PRUDENTIAL SECURITIES

ING BARINGS

DAIN RAUSCHER WESSELS



PART II

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

The following table sets forth all expenses, other than underwriting discounts and commissions, payable by the Registrant in connection with the sale of the common stock being registered. All amounts are estimated except the Securities and Exchange Commission registration fee and the NASD filing fee.

Registration fee............................................  $   31,000
NASD filing fee.............................................      10,500
Nasdaq National Market listing fee..........................      90,000
Printing and engraving expenses.............................     250,000
Legal fees and expenses.....................................     350,000
Accounting fees and expenses................................     315,000
Transfer Agent and registrar fees...........................      10,000
Premium for directors and officers insurance................     185,000
Miscellaneous...............................................       8,500
                                                              ----------
     Total..................................................  $1,250,000
                                                              ==========

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS

Our Amended and Restated Certificate of Incorporation requires us to indemnify our directors and officers against liabilities they may incur in these capacities, including liabilities under the Securities Act, to the maximum extent permitted by Section 145 of the Delaware General Corporation Law.

Our bylaws require that we indemnify each of our directors and officers for the judgments, fines and amounts paid in settlement, and the expenses reasonably incurred, in connection with any type of threatened, pending or completed action, suit or proceeding, whether or not bought by us or on our behalf. We must also advance all expenses incurred once we have received a commitment from the indemnified person to repay the amount if they should lose the action. We may, and have, purchased and maintained insurance on behalf of our directors and officers to the extent permitted by Delaware law.

Our Amended and Restated Certificate of Incorporation provides that our directors shall not be personally liable either to us or to any stockholder for monetary damages for breach of fiduciary duty as a director, except (i) for any breach of the director's duty of loyalty to us or our stockholders, or (ii) for acts or omissions which are not in good faith or which involve intentional misconduct or knowing violation of the law, or (iii) for any matter in respect of which such director shall be liable under Section 174 of Title 8 of the Delaware General Corporation Law or any amendment thereto or successor provision thereto, or (iv) for any transaction from which the director shall have derived an improper personal benefit.

Reference is also made to Section [ ] of the underwriting agreement contained in Exhibit 1.1 hereto, indemnifying our officers and directors against certain liabilities.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES

Since March 1, 1997, the Company has made sales of the following unregistered securities:

Common Stock. (i) On January 21, 1998, in connection with the sale of Series A Preferred Stock as described below (see "Preferred Stock," (i)), the Company issued 90,278 shares of common stock to an existing stockholder pursuant to anti-dilution rights held by such stockholder in accordance with its previous investment. No underwriters were involved and no commission was paid. The shares were issued in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(ii) On January 15, 1999, in connection with the sale of Series A Preferred Stock as described below (see "Preferred Stock," (ii)), the Company issued 106,345 shares of common stock to an existing stockholder

II-1


pursuant to anti-dilution rights held by such stockholder in accordance with its previous investment. No underwriters were involved and no commission was paid. The shares were issued in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

Options. (i) From March 1, 1997 to the present, the Company has issued employee stock options to purchase a total of 1,762,581 shares of common stock to 107 employees, directors and consultants of the Company at an exercise prices ranging from $.16 to $2.12 which represents a discount from fair market value. The grants of such options were exempt from registration pursuant to Rule 701 of the Securities Act.

Warrants. (i) On June 18, 1997, in connection with the sales of convertible notes as described below (see "Convertible Notes," (i)), the Company issued a warrant to one entity with certain concomitant rights to purchase shares of preferred stock of the Company for the exercise price of $25,000. On January 8, 1998, these warrants were canceled and replaced with the warrants dated January 21, 1998 to purchase 15,710 shares of preferred stock of the Company as described in (iv) below. No underwriters were involved and no commission was paid. The warrants were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(ii) On August 1, 1997, in connection with the sales of convertible notes as described below (see "Convertible Notes," (ii)), the Company issued a warrant to one entity for the purchase of 188,542 shares of preferred stock of the Company at an exercise price of $2.39. On January 16, 1998, this warrant was canceled and replaced with the warrant issued on January 21, 1998 to purchase 188,542 shares of preferred stock of the Company as described in (v) below. No underwriters were involved and no commission was paid. The warrants were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(iii) On January 21, 1998, in connection with the sale of Series A Preferred Stock as described below (see "Preferred Stock," (i)), the Company issued warrants to 7 persons or entities for the purchase of 628,470 shares of common stock of the Company at an exercise price of $1.87. The warrants were issued with the shares of Series A Preferred Stock for an aggregate purchase price of $5,532,839. The Company also issued warrants to purchase 314,235 shares of common stock to 2 persons or entities with an exercise price of $1.59, as compensation for financial and advisory services performed in connection with the transaction. The warrants were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(iv) On January 21, 1998, in connection with the sales of convertible notes as described below (see "Convertible Notes," (i)), the Company issued a warrant to one entity for the purchase of 15,710 shares of Series A Preferred Stock of the Company at an exercise price of $1.59. The warrants were issued in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(v) On January 21, 1998, in connection with the sales of convertible notes as described below (see "Convertible Notes," (ii)), the Company issued a warrant to one entity for the purchase of 188,542 shares of Series A Preferred Stock of the Company at an exercise price of $2.39. The warrants were issued in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(vi) On June 30, 1999, the Company issued a warrant for the purchase of 114,790 shares of common stock at an exercise price of $1.87 to one financial institution as partial consideration for the issuance of a $1.5 million senior term loan to the Company. The warrants were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(vii) On August 30, 1999, October 4, 1999 and December 14, 1999, the Company issued warrants for the purchase of 1,515, 1,335 and 1,187 shares of common stock at an exercise price of $1.87, respectively, to one financial institution as partial consideration for extending a $3 million equipment financing line of credit to the Company. No underwriters were involved and no commission was paid. The warrants were sold in

II-2


reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(viii) On February 23, 2000, the Company issued warrants to purchase 289,624 shares of common stock with an exercise price of $3.42 to 8 persons or entities in connection with the sale of convertible demand notes as described below (see "Convertible Notes" (iii)). No underwriters were involved and no commission was paid. The warrants were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(iv) On February 23, 2000, in connection with the sale of convertible notes as described below (see "Convertible Notes" (iii)), the Company issued warrants to purchase 19,758 shares of common stock with an exercise price of $3.42 to 2 persons or entities pursuant to pre-emptive rights held by such persons or entities. No underwriters were involved and no commission was paid. The warrants were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

Convertible Notes: (i) On June 18, 1997, the Company issued to one entity a convertible note for $50,000. No underwriters were involved and no commission was paid. The note was sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(ii) On August 1, 1997, the Company issued to one entity a convertible note for $450,000. No underwriters were involved and no commission was paid. The note was sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

(iii) On November 30, 1999, the Company issued to 8 persons or entities $1.8 million of convertible demand notes. No underwriters were involved and no commission was paid. The notes were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering.

Preferred Stock: (i) On January 21, 1998, the Company sold 3,477,222 shares of Series A Preferred Stock to 8 persons or entities, along with the warrants described above (see "Warrants" (iii)) for an aggregate purchase price of $5,532,839. As noted above in "Warrants," the Company also issued 314,235 warrants to purchase common stock to 2 entities or persons, with an exercise price of $1.59 as compensation for financial and advisory services performed in connection with the transaction. In addition, 2 entities converted $500,000 of notes plus accrued interest of $19,550 into 326,523 shares of Series A Preferred Stock. The shares were issued in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering, and in accordance with Regulation D.

(ii) On January 15, 1999, 7 entities purchased 3,142,350 shares of Series A Preferred Stock for an aggregate purchase price of $5,000,000. No underwriters were involved and no commission was paid. The notes were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering, and in accordance with Regulation D.

(iv) On February 23, 2000, 11 persons or entities purchased 1,911,102 shares of Series B Preferred Stock from the Company for an aggregate purchase price of $6,530,863. In addition, $1.8 million of convertible demand notes, issued to 8 persons or entities on November 30, 1999 as described above (see "Convertible Notes," (iii) above)), plus accrued interest of $41,863, were converted into 538,958 shares of Series B Preferred Stock. No underwriters were involved and no commission was paid. The shares were sold in reliance on the exemption from registration contained in Section 4(2) of the Securities Act for transactions not involving a public offering, and in accordance with Regulation D.

All sales of common stock made pursuant to the exercise of stock options were made in reliance on Rule 701 under the Securities Act or Section 4(2) of the Securities Act. All other sales were made in reliance on Section 4(2) of the Securities Act and/or Regulation D promulgated under the Securities Act. These sales were made without general solicitation or advertising, to investors who were sophisticated and who had

II-3


access to all relevant information necessary to evaluate the investment, and who represented the Registrant that they were acquiring the Securities for investment and appropriate legends were affixed to the share certificates in such transactions.

ITEM 16. EXHIBITS AND FINANCIAL STATEMENTS

(a) Exhibits

EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
-----------                      ----------------------
  1.1         Form of Underwriting Agreement**
  3.1         Amended and Restated Certificate of Incorporation of
              Cellomics*
  3.2         Bylaws of Cellomics*
  4.1         Loan and Security Agreement with Transamerica Business
              Credit Corporation, including warrant, dated June 30, 1999*
  4.2         Master Loan and Security Agreement with Oxford Venture
              Finance, LLC, including warrant, dated July 21, 1999*
  4.3         Series A Preferred Stock and Warrant Purchase Agreement by
              and among certain purchasers listed and Cellomics, Inc.,
              dated January 21, 1998*
  4.4         Series B Preferred Stock Purchase Agreement by and among
              certain purchasers listed and Cellomics, Inc., dated
              February 23, 2000*
  4.5         Form of Stock Certificate for shares of Common Stock
  5.1         Form of Opinion of Buchanan Ingersoll Professional
              Corporation**
 10.1         Lease Agreement with University of Pittsburgh, dated July 1,
              1996, for lease of office and laboratory space*
 10.2         Form of Proprietary Information and Property Agreement*
 10.3         License and Supply Agreement with Molecular Probes, Inc.,
              dated April 5, 1999*
 10.4         Employment Agreement between Biological Detection, Inc. and
              D. Lansing Taylor, dated October 1, 1998*
 10.5         Employment Offer Letter for R. Terry Dunlay, dated February
              2, 1999*
 10.6         Employment Offer Letter for L. Robert Johnston, dated
              October 15, 1998*
 10.7         Employment Offer Letter for Michael A. Nemzek, dated
              November 9, 1998*
 10.8         Employment Offer Letter for Alan W. Seadler, dated October
              12, 1998*
 10.9         Form of Key Employee Non-Compete Agreement*
 10.10        Development, Manufacturing and Supply Agreement with Carl
              Zeiss Jena GmbH, dated February 3, 2000*
 10.11        Award/Contract issued by the Office of Naval Research, dated
              September 14, 1998*
 10.12        Alliance Agreement with ACLARA BioSciences, Inc., dated
              October 26, 1999*
 10.13        Subcontract with University of Pittsburgh, dated May 5,
              1998*
 10.14        Patent License Agreement with Public Health Service (NIH),
              dated September 26, 1997*
 10.15        Sales and Marketing Agreement with Carl Zeiss Jena GmbH,
              dated February 21, 2000*
 10.16        Cellomics, Inc. 2000 Stock Plan*
 21.1         List of subsidiaries of Cellomics*
 23.1         Consent of PricewaterhouseCoopers LLP

II-4


EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
-----------                      ----------------------
 23.2         Consent of Buchanan Ingersoll Professional Corporation
              (contained in the opinion filed as Exhibit 5 to the
              Registration Statement)**
 24           Powers of Attorney of certain officers and directors of
              Cellomics (contained on the signature page of this
              Registration Statement)*
 27           Financial Data Schedule*


* Previously filed.

** To be filed by amendment.

(b) Financial Statement Schedules

The following financial statement schedule is filed herewith--Schedule II--Valuation and Qualifying Accounts.

ITEM 17. UNDERTAKINGS

We hereby undertake that:

(1) Insofar as indemnification for liabilities arising under the Securities Act may be permitted as to directors, officers and controlling persons of Cellomics pursuant to the provisions described in Item 14, or otherwise, we have been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by Cellomics of expenses incurred or paid by a director, officer or controlling person of Cellomics in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, we will, unless in the opinion of our counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

(2) For purposes of determining any liability under the Securities Act, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by Cellomics pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective.

(3) For the purpose of determining any liability under the Securities Act, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(4) At the closing, specified in the underwriting agreement, we shall provide the underwriters certificates in such denominations and registered in such names as required by the underwriters to permit prompt delivery to each purchaser.

II-5


SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Company has duly caused Amendment No. 1 to this Registration Statement on Form S-1 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Pittsburgh, Commonwealth of Pennsylvania, on the 12th day of April, 2000.

CELLOMICS, INC.

By:                  *
  ------------------------------------
    D. Lansing Taylor, Ph.D.
    President and Chief Executive
    Officer

POWER OF ATTORNEY

Pursuant to the requirements of the Securities Act of 1933, as amended, Amendment No. 1 to this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

                  SIGNATURE                                   TITLE                        DATE
                  ---------                                   -----                        ----

                      *                        President and Chief Executive          April 12, 2000
---------------------------------------------    Officer and Director (Principal
          D. Lansing Taylor, Ph.D.               Executive Officer)

         /s/ L. ROBERT JOHNSTON, JR.           Vice President Chief Financial         April 12, 2000
---------------------------------------------    Officer (Principal Financial and
           L. Robert Johnston, Jr.               Accounting Officer)

                      *                        Chairman of the Board of Directors     April 12, 2000
---------------------------------------------
                John M. Boles

                      *                        Director                               April 12, 2000
---------------------------------------------
               Alan Mendelson

                      *                        Director                               April 12, 2000
---------------------------------------------
               James A. Sharp

                      *                        Director                               April 12, 2000
---------------------------------------------
            Arnold Oronsky, Ph.D.

        * /s/ L. ROBERT JOHNSTON, JR.
  ------------------------------------------
  L. Robert Johnston, Jr., Attorney-in-fact
  Dated: April 12, 2000

II-6


REPORT OF INDEPENDENT ACCOUNTANTS ON
FINANCIAL STATEMENT SCHEDULE

To the Board of Directors
and Stockholders of Cellomics, Inc.:

Our audits of the financial statements referred to in our report dated March 3, 2000, appearing in this Registration Statement on Form S-1 for Cellomics, Inc. also included an audit of the financial statement schedule listed in Item 16(b) of this Registration Statement on Form S-1. In our opinion, this financial statement schedule presents fairly, in all material respects, the information set forth therein when read in conjunction with the related financial statements.

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania

March 3, 2000

II-7


SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS

                                                             ADDITIONS
                                                      -----------------------
                                        BALANCE AT    CHARGED TO     CHARGED                    BALANCE
                                         BEGINNING     COSTS AND    TO OTHER                    AT END
             DESCRIPTION                 OF PERIOD     EXPENSES     ACCOUNTS    DEDUCTIONS     OF PERIOD
             -----------                ----------    ----------    --------    ----------     ---------

For the year ending December 31, 1997
  Deferred tax valuation allowance....  $  234,000    $  840,000       $--          $--       $1,074,000
                                        ==========    ==========       ===          ===       ==========
For the year ending December 31, 1998
  Deferred tax valuation allowance....  $1,074,000    $1,918,332       $--          $--       $2,992,332
                                        ==========    ==========       ===          ===       ==========
For the year ending December 31, 1999
  Deferred tax valuation allowance....  $2,992,332    $4,114,329       $--          $--       $7,106,661
                                        ==========    ==========       ===          ===       ==========

II-8


EXHIBIT INDEX

EXHIBIT NO.                      DESCRIPTION OF EXHIBIT
-----------                      ----------------------
  1.1         Form of Underwriting Agreement**
  3.1         Amended and Restated Certificate of Incorporation of
              Cellomics*
  3.2         Bylaws of Cellomics*
  4.1         Loan and Security Agreement with Transamerica Business
              Credit Corporation, including warrant, dated June 30, 1999*
  4.2         Master Loan and Security Agreement with Oxford Venture
              Finance, LLC, including warrant, dated July 21, 1999*
  4.3         Series A Preferred Stock and Warrant Purchase Agreement by
              and among certain purchasers listed and Cellomics, Inc.,
              dated January 21, 1998*
  4.4         Series B Preferred Stock Purchase Agreement by and among
              certain purchasers listed and Cellomics, Inc., dated
              February 23, 2000*
  4.5         Form of Stock Certificate for shares of Common Stock
  5.1         Form of Opinion of Buchanan Ingersoll Professional
              Corporation**
 10.1         Lease Agreement with University of Pittsburgh, dated July 1,
              1996, for lease of office and laboratory space*
 10.2         Form of Proprietary Information and Property Agreement*
 10.3         License and Supply Agreement with Molecular Probes, Inc.,
              dated April 5, 1999*
 10.4         Employment Agreement between Biological Detection, Inc. and
              D. Lansing Taylor, dated October 1, 1998*
 10.5         Employment Offer Letter for R. Terry Dunlay, dated February
              2, 1999*
 10.6         Employment Offer Letter for L. Robert Johnston, dated
              October 15, 1998*
 10.7         Employment Offer Letter for Michael A. Nemzek, dated
              November 9, 1998*
 10.8         Employment Offer Letter for Alan W. Seadler, dated October
              12, 1998*
 10.9         Form of Key Employee Non-Compete Agreement*
 10.10        Development, Manufacturing and Supply Agreement with Carl
              Zeiss Jena GmbH, dated February 3, 2000*
 10.11        Award/Contract issued by the Office of Naval Research, dated
              September 14, 1998*
 10.12        Alliance Agreement with ACLARA BioSciences, Inc., dated
              October 26, 1999*
 10.13        Subcontract with University of Pittsburgh, dated May 5,
              1998*
 10.14        Patent License Agreement with Public Health Service (NIH),
              dated September 26, 1997*
 10.15        Sales and Marketing Agreement with Carl Zeiss Jena GmbH,
              dated February 21, 2000*
 10.16        Cellomics, Inc. 2000 Stock Plan*
 21.1         List of subsidiaries of Cellomics*
 23.1         Consent of PricewaterhouseCoopers LLP*
 23.2         Consent of Buchanan Ingersoll Professional Corporation
              (contained in the opinion filed as Exhibit 5 to the
              Registration Statement)**
 24           Powers of Attorney of certain officers and directors of
              Cellomics (contained on the signature page of this
              Registration Statement)*
 27           Financial Data Schedule*


* Previously filed.

** To be filed by amendment.

+ The schedules or exhibits to this document are not being filed herewith because we believe that the information contained therein should not be considered material to an investment decision in Cellomics or such information is otherwise adequately disclosed in this Registration Statement on Form S-1. We agree to furnish supplementally a copy of any schedule or

exhibit to the Commission upon request.


Exhibit 4.5

COUNTERSIGNED AND REGISTERED
AMERICAN STOCK TRANSFER & TRUST COMPANY
TRANSFER AGENT
AND REGISTRAR
BY

AUTHORIZED SIGNATURE

[CELLOMICS(TM) LOGO]

CELLOMICS, INC.
INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

THIS CERTIFICATE IS TRANSFERABLE                               SEE REVERSE FOR
        IN NEW YORK, N.Y.                                    CERTAIN DEFINITIONS
                                                        CUSIP

THIS CERTIFIES THAT

IS THE OWNER OF

FULLY PAID AND NON-ASSESSABLE COMMON SHARES $.01 PAR VALUE OF
CELLOMICS, INC.

(hereinafter called the "Corporation"), transferable on the books of the Corporation by the holder hereof in person or by duly authorized attorney upon surrender of this certificate property endorsed. This certificate and the shares represented hereby are issued and shall be held subject to all of the provisions of the Articles of Incorporation and the Bylaws of the Corporation, as restated or amended, or as same may be restated or amended hereafter (a copy of which is on file with the Transfer Agent and Co. Transfer Agent), to all of which the holder hereof by acceptance hereof agrees and assents.
This certificate is not valid until countersigned and registered by the Transfer Agent and Registrar.
WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

Dated
[CELLOMICS SEAL]

/s/ LEROY METZ                                      /s/ D. LANSING TAYLOR
        SECRETARY                                     PRESIDENT AND CHIEF
                                                       EXECUTIVE OFFICER


CELLOMICS, INC.

THE CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR SERIES THEREOF OF THE CORPORATION AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR RIGHTS. SUCH REQUEST MAY BE MADE TO THE TREASURER OF THE CORPORATION, OR TO THE TRANSFER AGENT OF THE CORPORATION.

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM -- as tenants in common              UNIF GIFT MIN ACT --             CUSTODIAN
TEN ENT -- as tenants by the entireties                          -------------         --------------
JT TEN  -- as joint tenants with right of                           (Cust)                 (Minor)
           survivorship and not as tenants                       under Uniform Gifts to Minors
           in common                                             Act
                                                                    ---------------------------------
                                                                                  (State)
                                             UNIF TRF MIN ACT --             CUSTODIAN (until age   )
                                                                 ------------                    ---
                                                                  (Cust.)

                                                                 ------------under Uniform Transfers
                                                                    (Minor)

                                                                 to Minors Act
                                                                              ----------------------
                                                                                       (State)

Additional abbreviations may also be used though not in the above list.

FOR VALUE RECEIVED,___________________hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE



(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)


__________________________________________________________________________Shares of common stock represented by the within Certificate, and do hereby irrevocably constitute and appoint__________________________________________________Attorney to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.

Date_____________________________________

X ________________________________________________

X ________________________________________________
NOTICE THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND
WITH THE NAMES(S) AS WRITTEN UPON THE FACE OF
THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE
WHATEVER.

Signature(s) Guaranteed

By______________________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM) PURSUANT TO SEC RULE 17Ad-15.


Exhibit 23.1

CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the use in this Registration Statement on Form S-1 of our reports dated March 3, 2000, relating to the financial statements and financial statement schedule of Cellomics, Inc., which appear in such Registration Statement. We also consent to the references to us under the headings "Experts" and "Selected Financial Data" in such Registration Statement.

PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania

April 13, 2000