REPLIGEN CORP
10-Q, 1999-02-12
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 10-Q

             [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                For the quarterly period ended December 31, 1998

                                       OR

            [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

   For the transition period from ____________________ to ____________________

                         Commission File Number 0-14656

                              REPLIGEN CORPORATION
             (exact name of registrant as specified in its charter)

                 Delaware                                      04-2729386
      (State or other jurisdiction of                       (I.R.S. Employer
       incorporation or organization)                      Identification No.)

            117 Fourth Avenue
         Needham, Massachusetts                                   02494
 (Address of principal executive offices)                       (Zip Code)

       Registrant's telephone number, including area code: (781) 449-9560

        -----------------------------------------------------------------
         (Former name, former address and former fiscal year, if changed
                              since last report.)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.  Yes  X    No    .
                                        ---      ---

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of January 31, 1999.

Common Stock, par value $.01 per share                            18,001,785
- --------------------------------------                         ----------------
                Class                                          Number of Shares


<PAGE>

                              REPLIGEN CORPORATION

                                      INDEX

<TABLE>
<CAPTION>
                                                                                                            PAGE
                                                                                                            ----
                          PART I. FINANCIAL INFORMATION
<S>      <C>                                                                                                 <C>
Item 1.  Financial Statements

         Condensed Consolidated Balance Sheets (Unaudited) as of December 31, 1998 and
         March 31, 1998                                                                                       3

         Condensed Consolidated Statements of Operations (Unaudited) for the Three and
         Nine Months Ended December 31, 1998 and 1997                                                         4

         Condensed Consolidated Statement of Cash Flows (Unaudited)for the Nine Months
         Ended December 31, 1998 and 1997                                                                     5

         Notes to Condensed Consolidated Financial Statements (Unaudited)                                     6

Item 2.  Management's Discussion and Analysis of Financial Condition and Results
         of Operations                                                                                        7


                      PART II. OTHER INFORMATION

Item 1.  Legal Proceedings                                                                                   11

Item 2.  Changes in Securities
         None

Item 3.  Defaults Upon Senior Securities
         None

Item 4.  Submissions of Matters to a Vote of Security Holders
         None

Item 5.  Other Information
         None

Item 6.  Exhibits and Reports on Form 8-K                                                                    11

   (a)   Exhibits

         10.1   Manufacturing Transfer Agreement with Amersham Pharmacia Biotech
         27.1   Financial Data Schedule

   (b)   Reports on Form 8-K
         None

Signature                                                                                                    11

Exhibit Index                                                                                                12

Exhibits                                                                                                     13
</TABLE>


                                       2
<PAGE>

PART I. FINANCIAL INFORMATION

ITEM I. FINANCIAL STATEMENTS

                              REPLIGEN CORPORATION
                      CONDENSED CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                      December 31, 1998     March 31, 1998
                                                      -----------------     --------------
     ASSETS                                              (Unaudited)           (Audited)
<S>                                                     <C>                 <C>          
Current assets:                                                          
  Cash and cash equivalents                             $   3,696,633       $   4,725,544
  Accounts receivable                                         327,565             212,857
  Inventories                                                 692,001             670,818
  Prepaid expenses and other current assets                   266,339             156,228
                                                        -------------       -------------
    Total current assets                                    4,982,538           5,765,447
                                                                         
Property, plant and equipment, at cost:                                  
  Equipment                                                   873,265             770,512
  Furniture and fixtures                                       61,376              40,563
  Leasehold improvements                                      460,318             442,528
                                                        -------------       -------------
                                                            1,394,959           1,253,603
  Less: accumulated depreciation and amortization             793,157             594,719
                                                        -------------       -------------
                                                              601,802             658,884

Other assets, net                                              88,472              88,472
                                                        -------------       -------------
                                                        $   5,672,812       $   6,512,803
                                                        =============       =============
                                                                         
                 LIABILITIES AND STOCKHOLDERS' EQUITY                    
                                                                         
Current liabilities:                                                     
  Accounts payable                                      $      52,540       $     100,719
  Accrued expenses                                            302,811             254,312
  Unearned income                                              60,750              33,332
                                                        -------------       -------------
     Total current liabilities                                416,101             388,363
                                                                         
Commitments and contingencies                                            
                                                                         
Stockholders' equity:                                                    
  Preferred stock, $.01 par value --                                     
    authorized -- 5,000,000 shares --                                    
    outstanding -- none                                            --                  --
  Common stock, $.01 par value --                                        
   authorized -- 30,000,000 shares--                                     
   outstanding -- 18,001,785 shares at December 31,                      
   1998 and March 31, 1998                                    180,017             180,017
  Additional paid-in capital                              130,264,048         130,264,048
  Accumulated deficit                                    (125,187,354)       (124,319,625)
                                                        -------------       -------------
     Total stockholders' equity                             5,256,711           6,124,440
                                                        -------------       -------------
                                                                         
                                                        $   5,672,812       $   6,512,803
                                                        =============       =============
</TABLE>

     See accompanying notes to condensed consolidated financial statements.


                                       3
<PAGE>

                              REPLIGEN CORPORATION
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                     Three Months Ended               Nine Months Ended
                                                     ------------------               -----------------

                                                December 31,    December 31,    December 31,    December 31,
                                                ------------    ------------    ------------    ------------
                                                    1998            1997            1998            1997
                                                    ----            ----            ----            ----
<S>                                             <C>             <C>             <C>             <C>          
Revenues:                                      
  Research and development                      $    275,238    $    377,957    $  1,013,675    $    802,326 
  Product                                            248,723         316,146         674,871         855,532 
  Investment income                                   50,730          44,862         169,912         159,968 
  Other                                               14,437          14,472          85,274         114,447 
                                                ------------    ------------    ------------    ------------ 
                                                     589,128         753,437       1,943,732       1,932,273 
                                                ------------    ------------    ------------    ------------ 
Costs and expenses:                            
  Research and development                           421,623         348,860       1,352,648       1,063,061
  Selling, general and administrative                317,770         300,609       1,029,013         922,818
  Cost of products sold                              175,528         198,607         429,801         426,425
                                                ------------    ------------    ------------    ------------
                                                     914,921         848,076       2,811,462       2,412,304
                                                ------------    ------------    ------------    ------------

Net loss                                        $   (325,793)   $    (94,639)   $   (867,730)   $   (480,031)
                                                ============    ============    ============    ============

Basic and diluted net loss per share            $      (0.02)   $       (.01)   $      (0.05)   $      (0.03)
                                                ============    ============    ============    ============
Basic and diluted weighted average 
common shares outstanding                         18,001,785      16,023,763      18,001,785      16,009,084
                                                ============    ============    ============    ============
</TABLE>

     See accompanying notes to condensed consolidated financial statements.


                                       4
<PAGE>

                              REPLIGEN CORPORATION
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                  Nine Months Ended December 31,
                                                              ------------------------------------
                                                                  1998                     1997
                                                              -----------              -----------
<S>                                                           <C>                      <C>         
  Cash flows from operating activities:                                              
     Net loss                                                 $  (867,730)             $  (480,031)
     Adjustments to reconcile net loss to net cash                                   
     used in operating activities -                                                  
       Depreciation and amortization                              198,439                  182,935
       Compensation charge from stock options                          --                   22,912
                                                                                     
  Changes in assets and liabilities -                                                
     Accounts receivable                                         (114,707)                 170,002     
     Inventories                                                  (21,183)                 (76,138)    
     Prepaid expenses and other current assets                   (110,111)                  32,791     
     Accounts payable                                             (48,179)                (103,609)    
     Accrued expenses and other current liabilities                48,499                 (154,266)    
     Unearned income                                               27,418                 (133,313)    
                                                              -----------              -----------     
        Net cash used in operating activities                    (887,554)                (538,717)    
                                                              -----------              -----------     
  Cash flows from investing activities:                                              
     Decrease in marketable securities                                 --                   72,353
     Purchases of property, plant and equipment, net             (141,357)                (105,264)
     Decrease in restricted cash                                       --                   50,087
                                                              -----------              -----------
        Net cash (used in) provided by investing activities      (141,357)                  17,176
                                                              -----------              -----------
  Cash flows from financing activities:                                              
     Net proceeds from the issuance of common stock                                  
     and warrants, net of issuance costs                               --                1,975,000
                                                              -----------              -----------
        Net cash provided by financing activities                      --                1,975,000
                                                              -----------              -----------
                                                                                     
  Net (decrease) increase in cash and cash equivalents         (1,028,911)               1,453,459
  Cash and cash equivalents, beginning of period                4,725,544                3,465,881
                                                              -----------              -----------
  Cash and cash equivalents, end of period                    $ 3,696,633              $ 4,919,340
                                                              ===========              ===========
</TABLE>

     See accompanying notes to condensed consolidated financial statements.


                                       5
<PAGE>

                              REPLIGEN CORPORATION
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                   (Unaudited)

1.    Basis of Presentation

            The condensed consolidated financial statements included herein have
      been prepared by Repligen Corporation (the "Company" or "Repligen"),
      pursuant to the rules and regulations of the Securities and Exchange
      Commission for quarterly reports on Form 10-Q and do not include all of
      the information and footnote disclosures required by generally accepted
      accounting principles. These financial statements should be read in
      conjunction with the audited financial statements and notes thereto
      included in the Company's Form 10-K for the year ended March 31, 1998.

            In the opinion of management, the accompanying unaudited financial
      statements include all adjustments, consisting of only normal, recurring
      adjustments, necessary to present fairly, the consolidated financial
      position, results of operations and cash flows. The results of operations
      for the interim periods presented are not necessarily indicative of
      results to be expected for the entire year.

            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
      disclosure of contingent assets and liabilities at the date of the
      financial statements and the reported amounts of revenues and expenses
      during the reporting period. Actual results could differ from those
      estimates.

2.    Net Loss Per Share

            The Company has adopted Statement of Financial Accounting Standards
      (SFAS) No. 128, Earnings per Share, effective December 15, 1997. SFAS No.
      128 establishes standards for computing and presenting earnings per share
      and applies to entities with publicly held common stock or potential
      common stock. The Company has applied the provisions of SFAS No. 128,
      retroactively to all periods presented. Basic and diluted net loss per
      share represents net loss divided by the weighted average number of common
      shares outstanding during the period. The dilutive effect of the potential
      common shares consisting of outstanding stock options and warrants is
      determined using the treasury stock method in accordance with SFAS No.
      128. Diluted weighted average shares outstanding at December 31, 1998 and
      1997 excluded the potential common shares from warrants and stock options
      because to do so would be antidilutive for the periods presented. At
      December 31, 1998, there are 1,030,500 options outstanding with a weighted
      average exercise price of $1.34 and 2,832,000 warrants outstanding with a
      weighted average exercise price of $3.97.

3.    Cash Equivalents

            The Company accounts for investments in accordance with SFAS No.
      115, Accounting for Certain Investments in Debt and Equity Securities. The
      Company considers all highly liquid investments with a maturity of three
      months or less at the time of acquisition to be cash equivalents. Included
      in cash equivalents at December 31, 1998 and 1997 are $241,000 and
      $2,086,000 of cash and money market funds and approximately $3,455,000 and
      $2,833,000 of commercial paper, respectively.

4.    Inventories

            Inventories are stated at the lower of cost (first-in, first-out) or
      market and consist of the following:


                                       6
<PAGE>

                                                 December 31,      March 31,
                                                    1998             1998
                                                 (Unaudited)      (Audited)
                                                 -----------     -----------

       Raw materials and work-in-process          $ 509,659       $ 388,727
       Finished goods                               182,342         282,091
                                                  ---------       ---------
            Total                                 $ 692,001       $ 670,818
                                                  =========       =========

            Work in process and finished goods inventories consist of material,
      labor, outside processing costs and manufacturing overhead.

5.    Comprehensive Income

            Effective January 1, 1998, the Company adopted SFAS No. 130
      Reporting Comprehensive Income, effective January 1, 1998. SFAS No. 130
      establishes standards for reporting and display of comprehensive income
      and its components in financial statements. Comprehensive income includes
      all changes in equity during a period except those resulting from
      investments by owners and distributions to owners. The comprehensive net
      loss is the same as net loss for all periods presented.

6.    New Accounting Standards

            In April 1998, the AICPA issued Statements of Position 98-5
      Reporting on the Costs of Start-up Activities (SOP 98-5). SOP 98-5
      requires all costs associated with the pre-opening, pre-operating and
      organization activities to be expensed as incurred. The Company will adopt
      SOP 98-05 beginning January 1, 1999. Adoption of this statement will not
      have a material impact on the Company's consolidated financial position or
      results of operations.

7.    Agreements

            On December 17, 1998, the Company entered into an agreement with
      Amersham Pharmacia Biotech AB (APB) in which the Company became the
      preferred manufacturer of APBiotech's recombinant Protein A. Under the
      terms of this agreement, APB agreed to pay an initial transfer fee to
      cover the costs of transferring certain technology and agreed to purchase
      Biotech rPA manufactured by the Company.

ITEM  2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF
         FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Cautionary Statement Regarding Forward-Looking Statements

            Statements in this Quarterly Report on Form 10-Q as well as oral
      statements that may be made by the Company or by officers, directors or
      employees of the Company acting on the Company's behalf, that are not
      historical facts constitute "forward-looking statements" within the
      meaning of the Private Securities Litigation Reform Act of 1997. Such
      forward-looking statements involve known and unknown risks, uncertainties
      and other factors that could cause the actual results of the Company to be
      materially different from the historical results or from any results
      expressed or implied by such forward-looking statements. The Company's
      future operating results are subject to risks and uncertainties and are
      dependent upon many factors, including, without limitation, the Company's
      ability to (i) meet its working capital and future liquidity needs, (ii)
      successfully implement its strategic growth strategies, (iii) understand,
      anticipate and respond to rapidly changing technologies and market trends,
      (iv) develop, manufacture and deliver high quality, technologically
      advanced products on a timely basis to withstand competition from
      competitors which may have greater financial, information gathering and
      marketing resources than the Company, (v) obtain and protect licensing and
      intellectual property rights necessary for the Company's technology and
      product


                                       7
<PAGE>

      development on terms favorable to the Company, and (vi) recruit and retain
      highly talented professionals in a competitive job market. Further
      information on potential factors that could affect the Company's financial
      results are included in filings made by the Company from time to time with
      the Securities and Exchange Commission included in the section entitled
      "Risk Factors" contained in the Company's Annual Report on Form 10-K for
      the fiscal year ended March 31, 1998 (File No.000-14656).

Overview

            Repligen Corporation ("Repligen" or the "Company") develops new
      drugs for cancer, organ transplantation and autoimmune diseases. The
      Company's most advanced therapeutic product (CTLA4-Ig) has been shown in
      animal models to selectively block unwanted immune responses in organ
      transplantation and autoimmune diseases. Initial clinical testing of
      CTLA4-Ig has been carried out in patients receiving a bone marrow
      transplant, which is a potential cure for several diseases of the immune
      system including leukemia, myeloma, lymphoma and sickle cell anemia.
      Despite the clinical success of BMTs, a significant number of patients
      experience a severe and potentially life-threatening complication - Graft
      versus Host Disease (GVHD) in which the newly transplanted immune system
      attacks the host. To minimize this complication, most BMTs require a
      search for a genetically "matched" donor which can delay treatment for
      months and cost >$25,000 and which only partially eliminates GVHD. An
      alternative source of donors would be a parent or sibling who is partially
      matched with the patient; however, past experience indicates that this
      source of bone marrow would produce a high incidence of severe and
      potentially life-threatening GVHD.

            In December 1998, investigators from the Dana-Farber Cancer
      Institute in Boston reported that ex vivo treatment of bone marrow from a
      genetically "mismatched" family member with CTLA4-Ig substantially reduced
      GVHD in twelve transplant patients. The Company intends to further
      evaluate CTLA4-Ig in "matched" and "unmatched" bone marrow transplants. In
      July 1998, Repligen filed a complaint relating to certain United States
      patents which have been issued to Bristol-Myers Squibb Corporation (see
      Legal Proceedings). The Company has filed its own patents related to
      compositions of matter and methods of use of CTLA4-Ig.

            The Company is also developing low molecular weight compounds which
      block angiogenesis by inhibiting the action of a key growth factor, VEGF.
      Inhibitors of angiogenesis or new blood vessel growth may arrest the
      growth of solid tumors and stop the progression of ocular diseases such as
      macular degeneration. This program is based on the Company's patented,
      high throughput screening assays designed to detect inhibitors of the
      growth factors which drive angiogenesis and proprietary libraries of
      compounds designed to mimic the natural cell surface ligands of these
      growth factors. In initial preclinical studies, several compounds
      identified from these libraries inhibited angiogenic growth factors in
      vitro and in vivo at non-toxic doses. The Company is evaluating selected
      compounds in animal models of angiogenesis. The Company's angiogenesis
      program is supported, in part, by a grant from the National Cancer
      Institute. Repligen is also applying its drug discovery technology to
      collaborations with pharmaceutical company partners.

            Repligen develops, manufactures and markets products for the
      production of protein pharmaceuticals (biopharmaceuticals) by affinity
      chromatography. The Company currently markets a line of products for the
      production of therapeutic monoclonal antibodies based on a recombinant
      form of Protein A, a naturally occurring affinity ligand for antibodies.
      In December 1998, the Company entered into a ten year agreement to
      manufacture recombinant Protein A for Amersham Pharmacia Biotech, a
      leading supplier to the biopharmaceutical marketplace.


                                       8
<PAGE>

Results of Operations

Revenues

            Total revenues for the three month period ended December 31, 1998
      and 1997 were approximately $589,000 and $753,000, respectively, a
      decrease of approximately $164,000 or 22%. This decrease was largely
      attributable to decreased research and development revenue and decreased
      product sales. Year to date total revenues increased approximately
      $11,000, or 1%, to $1,944,000 at December 31,1998 from December 31, 1997.

            Research and development revenues for the three month period ended
      December 31, 1998 and 1997 were approximately $275,000 and $378,000,
      respectively, a decrease of approximately $103,000 or 27%. This decrease
      was largely attributable to a milestone payment received from Pfizer Inc.
      during the third quarter of fiscal year 1998. In the first nine months of
      fiscal 1999, the Company recorded research and development revenues
      totaling $1,014,000 consisting of approximately $557,000 from contracted
      research and development programs and $457,000 from licensing
      arrangements. In the first nine months of fiscal 1998, the Company
      recorded research and development revenues totaling $802,000 of revenue
      with approximately $610,000 from contracted research and $192,000 from
      licensing arrangements.

            Product revenues for the three month period ended December 31, 1998
      and 1997 were approximately $249,000 and $316,000, respectively, a
      decrease of $67,000 or 21%. Year to date total product revenues decreased
      approximately $181,000, or 21%, to $675,000 from December 31, 1997. This
      decrease is attributed to variable large production scale orders of
      Protein A.

            Investment income for the three month period ended December 31, 1998
      and 1997 was approximately $51,000 and $45,000, respectively, an increase
      of approximately $6,000 or 13%. Year to date investment income increased
      approximately $10,000 or 6% from year to date December 31, 1997. These
      increases are largely attributable to higher average funds available for
      investment during fiscal 1999.

            Other revenues for the three month period ended December 31, 1998
      were approximately $14,000, unchanged from the comparable period ended
      December 31, 1997. Year to date other income decreased approximately
      $29,000 or 25% from December 31, 1997. This decrease is primarily due to
      the sale of equipment held by the Company reported as other income in
      fiscal 1998.

Expenses

            Total expenses for the three month period ended December 31, 1998
      and 1997 increased approximately $67,000 or 8% to $915,000 from $848,000
      and increased 17% or approximately $399,000 to $2,811,000 from $2,412,000
      for the nine months ended December 31, 1998 and 1997, respectively.

            Research and development expenses for the three month period ended
      December 31, 1998 and 1997 were approximately $422,000 and $349,000. For
      the first nine months of fiscal 1999, research and development expenses
      were approximately $1,353,000, or 27% higher than the comparable period in
      fiscal 1998. This increase reflects increased staffing in research and
      development as the Company expands its investment in proprietary drug
      discovery programs.

            Selling, general and administrative expenses for the three months
      ended December 31, 1998 and 1997 were approximately $318,000 and $301,000,
      respectively. For the first nine months of fiscal 1999, selling, general
      and administrative expenses were approximately $1,029,000, or 12% higher
      than the comparable period in fiscal 1998. This increase is attributable
      to increased costs in patent costs and shareholder services.


                                       9
<PAGE>

            Cost of products sold for the three months ended December 31, 1998
      and 1997 were approximately $176,000 and $199,000. For the first nine
      months of fiscal 1999, cost of products sold increased by $3,000, or 1%
      higher, from the comparable period in fiscal 1998. Cost of products sold
      in the three months ended December 31, 1998 and 1997 were 71% and 63% of
      product revenues. In the nine month period ended December 31, 1998 and
      1997, cost of products sold was 64% and 50%. This increase is largely
      attributable to increased inventory reserves created by the introduction
      of new protein A products provided in 1998.

Liquidity and Capital Resources

            The Company's total cash and cash equivalents decreased to
      $3,697,000 at December 31, 1998 from $4,726,000 at March 31, 1998. This
      decrease of $1,029,000 reflects net losses incurred during the nine month
      period ended December 31, 1998 of approximately $868,000, a decrease in
      prepaid expenses of $110,000 and capital expenditures of $141,000 offset
      in part by the increase in accrued expenses of $49,000 and increase in
      unearned income of $27,000. Working capital decreased to $4,566,000 at
      December 31, 1998 from $5,377,000 at March 31, 1998.

            The Company has entered into agreements with a number of
      collaborative partners and licensees. Under the terms of these agreements,
      generally, the Company may be eligible to receive research support,
      additional milestones or royalty revenue if the focus of these
      collaborations result in clinical evaluation and commercialization. There
      can be no assurance that these collaborations will result in future
      payments.

            The Company has funded operations primarily with cash derived from
      the sales of its equity securities, revenue derived from research and
      development contracts, product sales and investment income. While the
      Company anticipates that its cost of operations will increase in fiscal
      1999 as it continues to expand its investment in proprietary product
      development, the Company believes it has sufficient cash equivalents and
      marketable securities to satisfy its working capital and capital
      expenditure requirements for the next twenty-four months. Should the
      Company need to secure additional financing to meet its future liquidity
      requirements, there can be no assurances that the Company will be able to
      secure such financing, or that such financing, if available, will be on
      terms favorable to the Company.

Year 2000

            The Company has undertaken an initial review of its information
      technology computer systems and believes that the Year 2000 problem does
      not pose significant operational problems to its information technology
      systems. The majority of the Company's software and computer equipment has
      been purchased within the last five years from third-party vendors who
      have already provided upgrades intended to bring their products into Year
      2000 compliance. The Company has begun to address the small number of
      internal systems that are not yet Year 2000 compliant, and expects full
      compliance by the end of 1999. The Company currently believes that the
      costs of addressing these issues will not have a material adverse impact
      on the Company's financial position.

            The Company has also recently begun interviewing third parties,
      vendors and suppliers of the Company to determine their exposure to Year
      2000 issues, their anticipated risks and responses to those risks. To
      date, those vendors that have been contacted have indicated that their
      hardware or software is or will be Year 2000 compliant in time frames that
      meet the Company's requirements. However, the Company intends to continue
      to assess its exposure to Year 2000 noncompliance on the part of any of
      its material vendors and there can be no assurance that their systems will
      be Year 2000 compliant.

            The Company does not have a contingency plan in the event Year 2000
      compliance cannot be achieved in a timely manner. A contingency plan will
      be developed immediately upon completion of the Company's Year 2000
      compliance assessment.


                                       10
<PAGE>

Item 1. LEGAL PROCEEDINGS.

            On July 17, 1998, Repligen filed a complaint at the United States
      District Court for the District of Massachusetts in Boston, Massachusetts
      (the "Complaint"). The Complaint relates to a United States patent which
      was issued in 1995 to Bristol-Myers Squibb Corporation (the "BMS Patent")
      which claims a method of treating immune system diseases with CTLA4-Ig. In
      December 1998, related patents were issued to BMS claiming the composition
      of CTLA4-Ig. Thereafter, the Complaint was amended to include these
      patents. The amended Complaint seeks to correct the inventorship on these
      BMS Patents and seeks unspecified monetary damages. If successful in its
      claims, a licensor of Repligen will be named as an inventor on the BMS
      Patents which will give Repligen and Bristol-Myers Squibb shared rights to
      the patents. There can be no assurances that the litigation will conclude
      in a result beneficial to the Company. The failure of the litigation may
      restrict the Company's ability to commercialize CTLA4-Ig for certain
      applications.

Item 6. EXHIBITS AND REPORTS ON FORM 8-K

(a) Exhibits

               EXHIBIT                 DESCRIPTION
               -------                 -----------

                10.1*           Manufacturing Transfer Agreement

                27.1            Financial Data Schedule

      * Confidential Treatment has been requested as to omitted portions
pursuant to Rule 24b-2 promulgated under the Securities Exchange Act of 1934, as
amended.

(b) Reports on Form 8-K

      No current reports on Form 8-K were filed by the Company during the
      quarter covered by this report.

                                    SIGNATURE

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                                        REPLIGEN CORPORATION
                                                        (Registrant)


Date:  February 12, 1999                           By:  /s/ Walter C. Herlihy
                                                        -----------------------
                                                        Chief Executive Officer

                                                        Principal Financial and
                                                        Accounting Officer


                                       11
<PAGE>

                      REPLIGEN CORPORATION AND SUBSIDIARIES
                                  EXHIBIT INDEX

      EXHIBIT NO.     DESCRIPTION                                 PAGE
      -----------     -----------                                 ----

         10.1         Manufacturing Transfer Agreement            13
         27.1         Financial Data Schedule                     20


                                       12
<PAGE>

                        Manufacturing Transfer Agreement

This agreement (Agreement) is made as of December 17, 1998, by and between
Repligen Corporation ("Repligen"), a Delaware corporation with principal offices
at 117 Fourth Ave., Needham, MA 02494 and Amersham Pharmacia Biotech AB
("Biotech"), a corporation incorporated in Sweden with principal offices at
Bjrkgatan 30, SE-751 84 Uppsala (each a "Party" and collectively "the Parties").

      WHEREAS, Repligen possesses capabilities relating to the large scale
      manufacture of recombinant proteins including protein A; and

      WHEREAS, Biotech possesses technology, documentation, and know-how
      relating to the manufacture of that form of recombinant protein A
      (hereinafter "Biotech rPA") which is incorporated into a variety of
      products marketed and sold by Biotech; and

      WHEREAS, the Parties wish to enter an arrangement in which Repligen will
      become the preferred manufacturer of Biotech rPA for Biotech's use.

      NOW THEREFORE, for the mutual covenants contained herein, and for other
      good and valuable considerations, the Parties agree as follows:

1. DEFINITIONS

      For the purpose of this Agreement, the terms set forth hereunder shall be
defined as follows:

      a.    "Biotech IPA" means those forms of immobilized Biotech rPA which are
            manufactured, marketed, and sold to the general public by Biotech as
            further described in Schedule A attached hereto.

      b.    "Biotech rPA" means unimmobilized recombinant protein A manufactured
            according to either of the Old Process or the New Process.

      c.    "Biotech Specifications" means the set of physical, chemical, and
            functional characteristics that Biotech uses to determine the
            acceptability of Biotech rPA manufactured as described in Schedule B
            attached hereto. Biotech Specifications may be modified from time to
            time by mutual agreement of the Parties.

      d.    "Confidentiality Agreement" shall mean that confidentiality
            agreement dated April 20, 1998 entered into by and between the
            Parties.

      e.    "Equivalency Testing" means any and all testing on Biotech rPA
            manufactured by Repligen according to the New Process which Biotech,
            in its sole discretion, may consider necessary to conduct prior to
            and in support of the Process Change.

      f.    "First Agreement" means that agreement made by and between the
            Parties on September 29, 1992.

      g.    "License Agreement" means that agreement made by and between Biotech
            and Repligen in which Repligen grants to Biotech i) a non-exclusive
            license to US Patent No. 5,084,559 ("Protein A Domain Mutants") and
            ii) a license to technology and know-how relating to the manufacture
            of Repligen IPA.

      h.    "Launch Stock" means Biotech rPA produced by Repligen according to
            the New Process after the completion of the Qualification Lots but
            prior to the effective date of the Supply Agreement.

      i.    "New Process Documentation" means any and all documentation which
            will be created by Repligen pursuant to this Agreement in
            preparation for establishing the criteria and specifications for,
            and implementation of the New Process.


                                       13
<PAGE>

      j.    "New Process" means the process by which Repligen will manufacture
            Biotech rPA for sale to Biotech.

      k.    "Old Process" means the process by which Biotech rPA is produced by
            Biotech and any other parties as of the date of this Agreement.

      l.    "Old Process Documentation" means the English translation of any and
            all documentation related to the process which Biotech uses with
            respect to the production of Biotech rPA as of the date of this
            Agreement.

      m.    "Process Change" means that date upon which Biotech commences the
            marketing and sale to the general public of Biotech IPA which has
            been manufactured using Biotech rPA produced by Repligen according
            to the New Process.

      n.    "Process Technology" means any and all know-how, proprietary
            materials and reagents, documentation, trade secrets, and technology
            relating to the production of Biotech rPA which will be required by
            Repligen in order for Repligen to prepare for and manufacture
            Biotech rPA in accordance with the New Process. Process Technology
            includes but is not limited to bacterial production strains, English
            language manufacturing and quality control documents, recipes,
            formulae, etc.

      o.    "Qualification Lots" means the first three full scale production
            runs of Biotech rPA made by Repligen according to the New Process.

      p.    "rPA Products" means either or both of Repligen rPA and Biotech rPA.

      q.    "Repligen IPA" means those forms of immobilized Repligen rPA,
            manufactured and sold by Repligen as of the date of this Agreement.
            Specific forms of Repligen IPA referenced herein may be designated
            by their respective trade names, e.g. IPA-300, IPA-400, IPA-500,
            etc.

      r.    "Repligen rPA" means those forms of unimmobilized recombinant
            protein A which are manufactured and sold by Repligen. Specific
            forms of Repligen rPA referenced herein may be designated by their
            respective trade names, e.g. rPA-50, rPA-100, and srPA-50.

      s.    "Process Equipment" means any equipment which is offered for sale or
            lease by Biotech and which is determined by the Parties to be
            required for the manufacture of Biotech rPA by Repligen in
            accordance with the New Process.

      t.    "Process Validation" means any work requested by Biotech and carried
            out by Repligen to define the operating limits of any step of the
            New Process during or after the manufacturing of the Qualification
            Lots but prior to the Process Change.

      u.    "Supply Agreement" means that agreement between Biotech and
            Repligen, made effective as of the date of Process Change, pursuant
            to which Repligen is made the preferred manufacturer to Biotech of
            Biotech rPA.

2. PROCESS TRANSFER

      a.    Biotech shall arrange for the timely, complete, and successful
            transfer to Repligen of all Process Technology such that Repligen's
            readiness to commence the manufacture of Biotech rPA pursuant to
            this Agreement and/or the Supply Agreement is not delayed or
            impaired.


                                       14
<PAGE>

      b.    Biotech will provide to Repligen the Old Process Documentation in
            English within ten (10) days of the signing of this Agreement and
            will cooperate fully with Repligen to adapt the Old Process
            Documentation to Repligen's existing manufacturing, quality control,
            and document management systems. Any modification which is required
            for implementation of the New Process will be mutually agreed upon
            by the Parties. Repligen will create the New Process Documentation
            and will supply Biotech with a draft copy of the New Process
            Documentation within thirty (30) days of receipt of Old Process
            Documentation from Biotech. Biotech will have the final right of
            approval of all New Process Documentation. New Process Documentation
            will be finalized and agreed to by the Parties prior to January 21,
            1999 or at such later time as the Parties may establish by mutual
            consent.

      c.    Any and all subcontractors engaged by Repligen to carry out any
            aspect of the New Process will be bound by a confidential disclosure
            agreement ("CDA") with terms and conditions substantially similar to
            the Confidentiality Agreement. Biotech will have the right to
            consent to all subcontractors involved in manufacture of Biotech rPA
            which consent shall not be unreasonably withheld. Following consent
            by Biotech and execution by the subcontractor of a CDA, Repligen may
            share Process Technology with such party. Biotech may not contact
            Repligen's sub-contractors with specific reference to the
            manufacture of Biotech rPA without the prior consent of Repligen.
            Repligen may utilize alternative facilities under its control in the
            manufacture of Biotech rPA. Repligen will give Biotech nine (9)
            months prior written notice of any change in facility or
            sub-contractor for approval by Biotech, such approval not to be
            unreasonably withheld by Biotech.

      d.    Biotech will pay Repligen [*] to cover the costs of transferring the
            Process Technology within ten (10) days of execution of this
            Agreement.

      e.    Between January 1 and March 31, 1999, Repligen will manufacture [*]
            Qualification Lots for Biotech. Each Qualification Lot will be
            produced, tested, and released by Repligen according to the New
            Process Documentation and the Biotech Specifications. Finished
            Biotech rPA from the Qualification Lots will be shipped to Biotech
            on or before March 31, 1999. Biotech shall pay Repligen for Biotech
            rPA produced from the Qualification Lots and which meets Biotech
            Specifications in accordance with Section 4. Equivalency Testing of
            the Biotech rPA from the Qualification Lots may be carried out by
            either or both of the Parties at the discretion of Biotech.

      f.    Biotech will insure that Equivalency Testing and any required
            customer notification is completed in a timely fashion.

      g.    Biotech shall implement the Process Change as soon as practical and
            thereafter will not undertake to manufacture any products using
            Biotech rPA that was produced by the Old Process, except as may be
            specifically requested by preexisting customers of Biotech for such
            products. Such specific customer requests will be considered custom
            orders and products manufactured thereunder will be so labeled.

3. MANUFACTURING

      a.    During the 1999 calendar year, Biotech shall purchase Biotech rPA to
            serve as Launch Stock from Repligen according to the following
            schedule: [*]

      b.    Following the Process Change and thereafter during each year of the
            Supply Agreement, Biotech intends to continue to use Repligen as its
            preferred manufacturer for Biotech rPA. Consequently, Biotech
            intends to purchase from Repligen and Repligen agrees in such case
            to manufacture for Biotech [*] of the total annual requirements of
            Biotech for Biotech rPA. As long as Repligen retains its status as
            Biotech's preferred manufacturer, i.e. so that Repligen's share of
            the manufacturing of

[*] indicates material which has been omitted and for which confidential
treatment has been requested. All such material has been filed with the
Commission pursuant to rule 24b-2 promulgated under the Securities Exchange Act
of 1934, as amended.


                                       15
<PAGE>

            Biotech rPA for Biotech remains at or [*] of Biotech's annual
            requirements, Biotech's obligation to pay royalties to Repligen
            under the First Agreement shall be waived and no royalties shall be
            due. If during any calendar year Repligen loses its status as
            Biotech's preferred manufacturer, i.e., so that Repligen's share of
            Biotech rPA falls below [*] , royalties under the First Agreement
            will again be due and payable on all product sales occurring during
            that year according to the First Agreement.

      c.    The Parties acknowledge that, prior to Process Change, Biotech, at
            its sole discretion, may continue to manufacture or have
            manufactured Old Process Biotech rPA and/or Biotech IPA made with
            Old Process Biotech rPA and that some inventory of such products may
            exist at the time of Process Change. Following the date of Process
            Change, Biotech will solely promote Biotech IPA manufactured with
            New Process Biotech rPA and will sell Biotech IPA made with Old
            Process Biotech rPA only in respect of a repeat order which is
            specific for such product.

      d.    Following the date of Process Change, Biotech shall not manufacture
            or have manufactured Old Process Biotech rPA except in the event
            that both of the following occur: i) inventories of Old Process
            Biotech rPA and/or Biotech IPA made with Old Process Biotech rPA
            have been depleted and ii) a repeat order that is specific for such
            Biotech IPA made with Old Process Biotech rPA has been received.

            Old Process Biotech rPA manufactured under this Section 3d will not
            be included as part of the volumes of Biotech's annual requirements
            referenced in Section 3b.

      e.    Notwithstanding anything to the contrary, Repligen shall maintain
            the exclusive and unrestricted right to manufacture Repligen rPA.

      f.    Notwithstanding anything to the contrary, Biotech shall maintain the
            exclusive and unrestricted right to manufacture Biotech IPA.

4. PRODUCT PRICING

      a.    Biotech will purchase from Repligen at a price of [*] all Biotech
            rPA which is shipped to Biotech from the Qualification Lots and
            which meets Biotech Specifications.

      b.    Biotech represents and warrants that the Old Process yields at least
            [*] grams finished Biotech rPA per [*] of fermentation and this
            production yield has been used by the Parties to establish a pricing
            schedule for the Supply Agreement. The price paid by Biotech to
            Repligen for all Qualification Lots, Launch Stock and for all
            Biotech rPA manufactured under the Supply Agreement will be
            according to this schedule as set forth below:

              Kilograms ordered per annum              Price (USD) per gram
                         [*]                                    [*]

      c.    The price for Biotech rPA produced by Repligen in each subsequent
            year of the Supply Agreement after the first year will be based upon
            the above schedule and adjusted according to the average yield
            obtained in the previous year according to the following formula:
                  [*]

            wherein average yield is the average yield obtained over all runs in
            the immediately preceding year of production. The adjustment will be
            made on the anniversary of the date of Process Change in each year
            during the term of the Supply Agreement with the average yield
            determined by Repligen and subject to confirmation by Biotech.

      d.    In addition to annual adjustments made in the price to reflect
            actual production yields as set forth

[*] indicates material which has been omitted and for which confidential
treatment has been requested. All such material has been filed with the
Commission pursuant to rule 24b-2 promulgated under the Securities Exchange Act
of 1934, as amended.


                                       16
<PAGE>

            above, the price will also be adjusted on the anniversary of the
            date of Process Change in each year during the term of the Supply
            Agreement on the basis of the change in the United States Consumer
            Price Index or some other Index mutually agreed upon by both
            parties. The Parties may also elect from time to time and by mutual
            agreement to adjust the pricing in consideration of other factors,
            such as documented changes in Repligen's cost of manufacture,
            altered market conditions, process modifications, etc.

      e.    All pricing is FOB, Needham, MA.

5. PROCESS EQUIPMENT AND MATERIALS

      a.    All Process Equipment not presently owned by or in the possession of
            Repligen will be provided to Repligen by Biotech under a
            lease-purchase arrangement. Under such lease-purchase arrangement:
            1) Biotech will lease Process Equipment to Repligen for the combined
            terms of this Agreement and the Supply Agreement, 2) Repligen will
            make an annual lease payment at the end of each year of the Supply
            Agreement of [*] of Biotech's actual list price for Process
            Equipment in effect on the original date of this Agreement, 3) if
            this Agreement terminates without execution of the Supply Agreement
            or the Supply Agreement is terminated voluntarily by or as a
            consequence of breach by Repligen, the lease will also terminate and
            Process Equipment shall be promptly returned to Biotech, 4) if the
            Supply Agreement is executed but is subsequently terminated
            voluntarily by or as a consequence of breach by Biotech, Repligen
            shall have the option of returning Process Equipment or continuing
            lease payments under the same terms, 5) upon completion of all ten
            lease payments, [*].

      b.    Process Equipment provided by Biotech under this Section 5 will be
            delivered to Repligen upon request and in a timely fashion such that
            Repligen's readiness to commence the manufacture of Biotech rPA
            pursuant to this Agreement and/or the Supply Agreement is not
            delayed or impaired.

      c.    Any equipment or hardware which the Parties mutually agree is
            specifically required for the New Process and which is neither
            presently owned by or in the possession of Repligen nor manufactured
            and offered for sale by Biotech will be provided by Biotech at no
            cost to Repligen for the use of Repligen during the combined terms
            of this Agreement and the Supply Agreement. Such equipment will
            include: [*].

      d.    Any equipment provided under this Section 5 which becomes unable to
            perform according to the New Process Documentation during the term
            of the Agreement for any reason other than misuse or neglect will be
            replaced by Biotech at no cost to Repligen. Any equipment provided
            under this Section 5 which becomes unable to perform during the term
            of the Agreement due to misuse, neglect, or operator error will be
            replaced by Repligen at no cost to Biotech.

      e.    During the term of the Agreement, Biotech will supply Repligen with
            any and all requested quantities of chromatography media which are
            marketed and sold by Biotech and required by Repligen in the
            manufacture of Biotech rPA at a [*] discount to the then current
            list price.

      f.    During the term of the Agreement, Biotech will supply Repligen with
            any requested quantities of Sepharose 4FF and Sepharose 6FF at a [*]
            discount to the then current list price or to the last listed price.

      g.    [*]

[*] indicates material which has been omitted and for which confidential
treatment has been requested. All such material has been filed with the
Commission pursuant to rule 24b-2 promulgated under the Securities Exchange Act
of 1934, as amended.


                                       17
<PAGE>

6. TERM

      a.    This Agreement will remain in effect from the date of signing until
            the effective date of the Supply Agreement, or December 31, 1999,
            whichever is earlier.

7. TERMINATION

      a.    Either Party may terminate this Agreement upon the material breach
            of the other Party's performance hereunder, upon 30 days written
            notice. The failure to cure such breach to the other Party's
            satisfaction within 30 days will result in the immediate termination
            of this Agreement.

8. ASSIGNMENT

      a.    This Agreement is not assignable by either Party absent the other
            Party's written consent. If Repligen is purchased by a third party
            which is a competitor of Biotech, Biotech has the right to approve
            the transfer of the Agreement. For purposes hereof, the term
            "purchase" shall mean i) a sale of all or substantially all of the
            assets of Repligen or ii) the merger and consolidation of Repligen
            with or into another corporation such that the stockholders of
            Repligen immediately following such transaction hold, directly or
            indirectly, less than 50% of the voting securities of the
            corporation surviving such transaction.

9. CONFIDENTIALITY

      a.    Any and all information disclosed by one Party to the other under
            this Agreement shall be handled in accordance with the terms and
            conditions of the Confidentiality Agreement and consequently be
            treated as confidential - as agreed therein - for the entire
            duration of this Agreement, the duration of the Supply Agreement and
            for a period of five (5) years thereafter.

10. REPORTING

      a.    Within 20 days following the completion of each quarter during the
            term of this Agreement or the Supply Agreement, Biotech will inform
            Repligen as to the status of the inventory of Biotech rPA and
            Biotech IPA on hand as well as the aggregate quantity of Biotech rPA
            that has been sold during the preceding quarter. Repligen will have
            the right to audit all relevant records of Biotech with respect to
            this information.

11. DISCLOSURE

      a.    Upon the execution of this Agreement, either Party will be entitled
            to publicly announce this transaction and its general terms,
            including the nature and scope of the Supply Agreement, provided
            that the wording of such announcement shall be subject to the other
            Party's prior review and reasonable satisfaction. Either Party shall
            be permitted under this Agreement to make any disclosure which may
            be required by law.

12. GENERAL

      a.    Biotech acknowledges that Repligen markets and sells several forms
            of Repligen rPA which include but are not restricted to rPA-50,
            rPA-100, and srPA-50. Repligen will retain the exclusive and
            unrestricted right to make, have made, market, and sell all forms of
            Repligen rPA in all markets and to any party. Repligen will not sell
            or transfer Biotech rPA to any party other than Biotech, except with
            Biotech's consent.

      b.    This Agreement is subject to and shall be construed and enforced in
            accordance with the laws of the State of New York. Any disputes
            arising hereunder shall be resolved with reference to the English
            language version of this Agreement regardless of any translations
            made for the convenience of the Parties. All disputes between the
            Parties shall be resolved by binding arbitration in accordance with


                                       18
<PAGE>

            the rules and regulations of the American Arbitration Association in
            the city of New York, NY. Notwithstanding anything herein to the
            contrary, the Parties acknowledge and agree that each shall have the
            right to obtain equitable relief against the other provided that
            each Party hereby agrees to submit to the jurisdiction of the courts
            of the State of New York or the federal courts of the United States
            located in New York and that the venue for all such proceedings
            shall lie in the State of New York.

IN WITNESS WHEREOF, the Parties hereto have hereunto set their hands and seals
and duly executed this Agreement the day and year first written above.


FOR REPLIGEN CORPORATION                          FOR AMERSHAM PHARMACIA
                                                  BIOTECH AB


/s/ DANIEL P. WITT                                /s/ ARNE FORSELL
- -------------------------                         --------------------------
    12/17/98                                        

                                                  /s/ PER-ERIK SANDLUND
                                                  --------------------------
                                                      12/18/98


                                       19

<TABLE> <S> <C>


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<S>                                                <C>
<PERIOD-TYPE>                                      9-MOS
<FISCAL-YEAR-END>                                  MAR-31-1999
<PERIOD-END>                                       DEC-31-1998
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                                        0
                                                  0
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</TABLE>


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