BIOGEN INC
10-K/A, 1997-03-28
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1

                                  FORM 10-K/A

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
      (Mark One)

          [X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                SECURITIES EXCHANGE ACT OF 1934 [FEE REQUIRED]
                 For the fiscal year ended December 31, 1996

                                       OR

          [ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                 SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

                        Commission file number: 0-12042


                                  BIOGEN, INC.
             (Exact name of Registrant as specified in its charter)


          Massachusetts                            04-3002117
     (State or other jurisdiction               (I.R.S. Employer
   of incorporation or organization)           Identification No.)


              14 Cambridge Center, Cambridge, Massachusetts 02142
               (Address of principal executive offices)(zip code)

       Registrant's telephone number, including area code: (617) 679-2000


        Securities registered pursuant to Section 12(b) of the Act: None


      Securities registered pursuant to Section 12(g) of the Act:   

                         Common Stock, $.01 par value
                               (Title of class)
                                      

     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 by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to
the best of Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [ ]

     Aggregate market value of Common Stock held by nonaffiliates of the
Registrant at February 13, 1997: $3,526,097,099 (excludes shares held by
directors).  Exclusion of shares held by any person should not be construed to
indicate that such person possesses the power, direct or indirect, to direct or
cause the direction of management or policies of the Registrant, or that such
person is controlled by or under common control with the Registrant.  Common
Stock outstanding at February 13, 1997: 73,060,328 shares.

                      DOCUMENTS INCORPORATED BY REFERENCE

     Portions of the Registrant's definitive Proxy Statement for its 1997
Annual Meeting of Stockholders are incorporated by reference into Part III of
this Report, and portions of the Registrant's 1996 Annual Report to
Shareholders are incorporated by reference into Parts II and IV of this Report.
<PAGE>   2
(3) Exhibits

EXHIBIT NO.      DESCRIPTION
- -----------      -----------
(3.1)            Articles of Organization, as amended

(3.2)            By-Laws, as amended (k)

(4.1)            Form of Common Stock Share Certificate (m)

(4.2)            Certificate of Designation of Series A Junior Participating
                 Preferred Stock (f)

(4.3)            Rights Agreement dated as of May 8, 1989 between Registrant
                 and The First National Bank of Boston, as Rights Agent (f)

(10.1)           Independent Consulting and Project Agreement dated as of June
                 29, 1979 between Registrant and Kenneth Murray (a)**

(10.2)           Letter Agreement dated September 23, 1995 with Sir Kenneth
                 Murray relating to renewal of Independent Consulting
                 Agreement (r)**

(10.3)           Minute of Agreement dated February 5, 1981 among Registrant,
                 The University Court of the University of Edinburgh and
                 Kenneth Murray (a)**

(10.4)           Independent Consulting Agreement dated as of June 29, 1979
                 between Registrant and Phillip A. Sharp (a)**

(10.5)           Letter Agreement dated December 15, 1995 with Phillip Sharp
                 relating to chairmanship of Scientific Board and renewal of
                 Independent Consulting Agreement (r)**

(10.6)           Project Agreement dated as of December 14, 1979 between
                 Registrant and Phillip A. Sharp (a)**

(10.7)           Share Restriction and Repurchase Agreement dated as of
                 December 15, 1979 between Registrant and Phillip A.
                 Sharp (a)**

(10.8)           Consulting Agreement dated as of April 1, 1991, as amended,
                 between Registrant and Alexander G. Bearn (i)**

(10.9)           Letter Agreement dated April 14, 1995 with Dr. Alexander
                 Bearn relating to renewal of Independent Consulting
                 Agreement (r)**

(10.10)          Form of Amendment dated July 1, 1988 to Independent
                 Consulting Agreement between Registrant and Scientific Board
                 Members (e)**

(10.11)          Form of Share Purchase Agreement between Registrant and
                 Scientific Board Members (a)**

(10.12)          Form of Stock Option Agreement between Registrant and
                 certain outside directors (c)**
<PAGE>   3

(10.13)          Letter regarding employment of James L. Vincent dated
                 September 23, 1985 (b)**

(10.14)          Form of Stock Option Agreement with James L. Vincent
                 under 1985 Non-Qualified Stock Option Plan (k)**

(10.15)          Form of Stock Option Agreement with James L. Vincent
                 under 1985 Non-Qualified Stock Option Plan (1995) (r)**

(10.16)          Letter dated December 13, 1989 regarding employment of
                 Dr. Irving H. Fox (h)**

(10.17)          Letter dated April 7, 1993 regarding employment of Dr.
                 Joseph M. Davie (l)**

(10.18)          Letter dated January 12, 1994 regarding employment of James
                 R. Tobin (n)**

(10.19)          Form of Indemnification Agreement between Registrant and
                 each Director and Executive Officer (e)**

(10.20)          Second Amended and Restated Agreement and Certificate of
                 Limited Partnership dated as of May 15, 1984 among Biogen
                 Medical Products, Inc. as General Partner and certain
                 limited partners (g)

(10.21)          First Amendment dated December 22, 1986 to Agreement and
                 Certificate of Limited Partnership (c)

(10.22)          Technology License Agreement dated May 15, 1984 between
                 Biogen B.V. and Biogen Medical Products Limited Partnership
                 (g)

(10.23)          Development Contract dated May 15, 1984 between Biogen
                 B.V. and Biogen Medical Products Limited Partnership (g)

(10.24)          Amendment dated December 22, 1986 to Development Contract (c)

(10.25)          Amendment dated January 1, 1987 to Development Contract (d)

(10.26)          Joint Venture Option Agreement dated May 15, 1984 between
                 Biogen, Inc. and Biogen Medical Products Limited Partnership
                 (g)

(10.27)          Purchase Option Agreement dated May 15, 1984 between
                 Biogen B.V. and the limited partners of Biogen Medical
                 Products Limited Partnership (g)

(10.28)          Guaranty dated May 15, 1984 to Biogen Medical Products
                 Limited Partnership by Registrant guaranteeing certain
                 obligations of Biogen Medical Products, Inc., Biogen B.V.
                 and Biogen, Inc. to the Partnership (g)

(10.29)          Demand Loan Agreement dated October 1, 1989 between Biogen
                 Medical Products Limited Partnership and Biogen Medical
                 Products, Inc. (g)

(10.30)          Certificate of Cancellation of Certificate of Limited
                 Partnership of Biogen Medical Products Limited Partnership
                 dated December 24, 1996
<PAGE>   4

(10.31)          Standard Form Commercial Lease dated January 29, 1981
                 between Ira C. Foss and Ira C. Foss, Jr., as Trustees of
                 Eastern Realty Trust, and B. Leasing, Inc. (g)

(10.32)          Letter of May 24, 1989 exercising option under Standard
                 Form Commercial Lease dated January 29, 1981 (g)

(10.33)          Lease Extension Agreement dated February 20, 1990 between
                 Eastern Realty Trust and Registrant (g)

(10.34)          Standard Form Commercial Lease dated June 1, 1989 between
                 Eastern Realty Trust and Registrant (g)

(10.35)          Cambridge Center Lease dated October 4, 1982 between
                 Mortimer Zuckerman, Edward H. Linde and David Barrett, as
                 Trustees of Fourteen Cambridge Center Trust, and B. Leasing,
                 Inc. (a)

(10.36)          First Amendment to Lease dated January 19, 1989 amending
                 Cambridge Center Lease dated October 4, 1982 (k)

(10.37)          Second Amendment to Lease dated March 8, 1990 amending
                 Cambridge Center Lease dated October 4, 1982 (k)

(10.38)          Third Amendment to Lease dated September 25, 1991 amending
                 Cambridge Center Lease dated October 4, 1982 (k)

(10.39)          Lease dated October 6, 1993 between North Parcel Limited
                 Partnership and Biogen Realty Limited Partnership (n)

(10.40)          1983 Employee Stock Purchase Plan, as amended and restated
                 through September 22, 1995 (r)**

(10.41)          1982 Incentive Stock Option Plan as amended through April 25,
                 1995 and restated with form of Option Agreement (q)**

(10.42)          1985 Non-Qualified Stock Option Plan as amended through
                 April 25, 1995 and restated with form of Option Agreement
                 (q) **

(10.43)          1987 Scientific Board Stock Option Plan as amended through
                 April 3, 1992 and restated with form of Option Agreement (j)**

(10.44)          Voluntary Executive Supplemental Savings Plan (p)**

(10.45)          Supplemental Executive Retirement Plan (p)**

(10.46)          Voluntary Board of Directors Savings Plan (p)**

(10.47)          Exclusive License and Development Agreement dated December
                 8, 1979 between Registrant and Schering Corporation (a)

(10.48)          Amendatory Agreement dated May 14, 1985 to Exclusive
                 License and Development
<PAGE>   5
                 Agreement dated December 8, 1979 (b)

(10.49)          Amendment and Settlement Agreement dated September 29,
                 1988 to Exclusive License and Development Agreement dated
                 December 8, 1979 (k)

(10.50)          Amendment dated March 20, 1989 to Exclusive License and
                 Development Agreement dated December 8, 1979 (k)

(10.51)          License Agreement (United States) dated March 28, 1988
                 between Registrant and SmithKline Beecham Biologicals, s.a.
                 (as successor to Smith Kline-R.I.T, s.a.) (k)

(10.52)          License Agreement (International) dated March 28, 1988
                 between Registrant and SmithKline Beecham Biologicals, s.a.
                 (as successor to Smith Kline-R.I.T., s.a.) (k)

(10.53)          Sublicense Agreement dated as of February 15, 1990 among
                 Registrant, SmithKline Beecham Biologicals, s.a (as successor
                 to SmithKline Biologicals, s.a.) and Merck and Co., Inc. (k)

(10.54)          Supplemental Amendment and Agreement dated as of March 1,
                 1994 between the Registrant and Schering Corporation (o)

(10.55)          Letter agreement amending employment arrangement between
                 the Registrant and James L. Vincent dated as of November 21,
                 1996 *  **

(11)             Computation of Earnings per Share

(12)             None

(13)             Incorporated portions from Biogen, Inc. 1996 Annual Report
                 to Shareholders

(21)             Subsidiaries of the Registrant

(24.1)           Consent of Price Waterhouse LLP (Included in Part IV hereof)

(29)             None

            (a)  Previously filed with the Commission as an exhibit to
                 Registration Statement on Form S-1, File No. 2-81689 and
                 incorporated herein by reference.

            (b)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1985, as amended, File No. 0-12042 and
                 incorporated herein by reference.

            (c)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1986, as amended, File No. 0-12042 and
                 incorporated herein by reference.

            (d)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1987, File No. 0-12042 and incorporated herein
                 by reference.
<PAGE>   6

            (e)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1988, File No. 0-12042 and incorporated herein
                 by reference.

            (f)  Previously filed with the Commission as an exhibit to
                 Registration Statement on Form 8-A, File No. 0-12042, filed
                 May 26, 1989 and incorporated herein by reference.

            (g)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1989, File No. 0-12042, and incorporated herein
                 by reference.

            (h)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1990, File No. 0-12042, and incorporated herein
                 by reference.

            (i)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1991, File No. 0-12042, and incorporated herein
                 by reference.

            (j)  Previously filed with the Commission as an exhibit to
                 Registrant's Quarterly Report on Form 10-Q for the quarter
                 ended June 30, 1992, File No. 0-12042, and incorporated
                 herein by reference.

            (k)  Previously filed with the Commission as an exhibit to the
                 Registrant's Annual Report on Form 10-K for the fiscal year
                 ended December 31, 1993, File No. 0-12042, and incorporated
                 herein by reference.

            (l)  Previously filed with the Commission as an exhibit to the
                 Registrant's Quarterly Report on Form 10-Q for the quarter
                 ended June 30, 1993, File No. 0-12042, and incorporated
                 herein by reference.

            (m)  Previously filed with the Commission as an exhibit to
                 Registration Statement on Form S-3, File No. 33-51639, and
                 incorporated herein by reference.

            (n)  Previously filed with the Commission as an exhibit to
                 Registrant's Annual Report on Form 10-K for the year ended
                 December 31, 1994, File No. 0-12042, and incorporated herein
                 by reference.

            (o)  Previously filed with the Commission as an exhibit to the
                 Registrant's Quarterly Report on Form 10-Q for the quarter
                 ended March 31, 1994, File No. 0-12042, and incorporated
                 herein by reference.

            (p)  Previously filed with the Commission as an exhibit to the
                 Registrant's Annual Report on Form 10-K for the fiscal year
                 ended December 31, 1994, File No. 0-12042, and incorporated
                 herein by reference.

            (q)  Previously filed with the Commission as an exhibit to the
                 Registrant's Quarterly Report on Form 10-Q for the quarter
                 ended June 30, 1995, File No. 0-12042, and incorporated
                 herein by reference.

            (r)  Previously filed with the Commission as an exhibit to the
                 Registrant's Annual Report on
<PAGE>   7

                 Form 10-K for the fiscal year ended December 31, 1995, File 
                 No. 0-12042, and in incorporated herein by reference.

     * Filed herewith
    ** Management contract or compensatory plan or arrangement
<PAGE>   8

    Pursuant to the requirements of Section 13 or 15(d) 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.

BIOGEN, INC.

By: /s/ James R. Tobin
    -------------------------------------
    President and Chief Executive Officer

Dated  March 27, 1997
<PAGE>   9

                                 EXHIBIT INDEX
                                 -------------


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

(10.55)          Letter agreement amending employment arrangement between
                 the Registrant and James L. Vincent dated as of 
                 November 21, 1996

<PAGE>   1

                                                          Exhibit 10.55
                                                          -------------

                                                          November 21, 1996



Mr. James L. Vincent
7 Audubon Road
Weston, MA  02193

Dear Jim:

     You and Biogen, Inc., as successor by merger to Biogen Research Corp.,
("Biogen" or the "Company") are parties to an Employment Agreement dated
September 23, 1985 (the "Employment Agreement"), pursuant to which you serve as
Chairman of the Board of Directors ("Chairman"), Chief Executive Officer and a
member of the Board of Directors of the Company (the "Board").  This letter
agreement is being entered into in contemplation of the election on some future
date by the Company's Board, acting on your recommendation, of a new Chief
Executive Officer of the Company, after which the Company wishes to be assured
of your continued service to Biogen in the capacities referred to below.
Accordingly, this letter agreement will amend and supplement the terms of your
employment as set forth in the Employment Agreement.

     Except as amended and supplemented by this letter agreement, the
Employment Agreement is confirmed and shall remain in full force and effect.
All references in the Employment Agreement to the "Company" and "Biogen" shall
refer to Biogen, Inc. and to the "Agreement" shall refer to the Employment
Agreement, as amended and supplemented by this letter agreement.  The date on
which you cease to be the Chief Executive Officer of Biogen, but continue as
Chairman, is referred to as the "Change Date."  Capitalized terms used in this
letter agreement and not defined herein shall have the meaning provided in the
Employment Agreement and capitalized terms used in the Employment Agreement and
not defined therein shall have the meaning provided in this letter agreement.

     1.     DUTIES AS CHAIRMAN.  It is expected that as Chairman, after the
Change Date, your key roles will include Board Leadership, including taking the
initiative in shaping Board corporate governance strategy, retaining the
principal responsibility for formulating and implementing the Board membership
philosophy, and representing the Board in matters involving management and
others when Board involvement exceeds normal Board meeting participation;
Management Support and Continuity, including providing support and mentoring
for senior management, assisting with organizational strategy and staffing and
acting as a continuing senior management resource for the Company; and General
Roles, including  contributing to the corporate long-term strategy and acting
as a senior Company representative.  In addition, the Board may assign to you
other appropriate duties consistent with the foregoing.
<PAGE>   2

Mr. James L. Vincent
November 21, 1996
Page 2


   2.     EMPLOYMENT.  The following paragraph replaces paragraph 1 of the
Employment Agreement:

     1.   EMPLOYMENT.  You are currently serving as Chairman, Chief Executive
     Officer, a Director, a member of the Compensation and Management
     Development Committee of the Board and a member of the Nominating
     Committee of the Board.  Until the Change Date, you will continue to serve
     in those capacities and will also serve as Chairman of the Executive
     Committee of the Board, if and when such Executive Committee is created,
     and as a senior executive officer of such Affiliates of Biogen as the
     Board may request from time to time.  Following the Change Date, you will
     continue to serve as Chairman, a Director of the Company, a member of the
     Compensation and Management Development Committee of the Board and a
     member of the Nominating Committee of the Board and will also serve as
     Chairman of the Executive Committee of the Board, if and when such
     Executive Committee is created.  You agree until the Change Date to devote
     substantially full business time and energies to the affairs of the
     Company.  Following the Change Date, you agree to devote such time to the
     affairs of the Company as is necessary for the performance of your duties.
     At all times prior to the Change Date, you agree to work exclusively
     hereunder during the term of your employment hereunder and at all times
     after the Change Date, you agree to work principally hereunder during the
     term of your employment hereunder.  Notwithstanding the foregoing and
     subject to your other obligations in this Agreement, you may serve as a
     Director of one or more entities the business of which does not directly
     compete with the business of the Company.

     3.   TERM.  The term of your service hereunder shall continue after the
Change Date for a period of four years (the "Initial Chairmanship Term"),
subject to the Company's right, by written notice to you prior to the end of
the Initial Chairmanship Term, to extend the term for three additional years,
and subject to any earlier termination in accordance with this letter
agreement.

     4.   SALARY AND BONUSES.  The following provisions, rather than those in
paragraphs 4 and 5 of the Employment Agreement, will apply during your
employment after the Change Date.  Your initial annual salary for your
employment as Chairman following the Change Date will be determined by the
Board, but will be not less than the average of your annual salary for the
three years preceding the Change Date.  Thereafter, the Board will determine
annually any salary increases and bonus payments.  It is expected that after
the Change Date, there will increasingly be less need for you to devote time to
the business and affairs of the Company and, accordingly, it will be possible
for you, consistent with the performance of your duties, to decrease such time.
It is anticipated that any such decreases will be taken into account by the
Board when considering possible future bonuses.  In the event that you continue
to serve as a Director of the Company

<PAGE>   3

Mr. James L. Vincent
November 21, 1996
Page 3


following the compensation as generally provided by the Company to non-employee
Directors.

     5.   BENEFITS.  (a)  During your employment hereunder, both prior to and
after the Change Date, you will continue to be entitled to the benefits set
forth in subparagraphs 6(a) through (e) of the Employment Agreement.  The
benefits provided pursuant to subparagraph 6(a) of the Employment Agreement
will be consistent with current practice.  The limitation in subparagraph 6(b)
of the Employment Agreement to a nine year period for the payment of the
premiums for $2,100,000 of life insurance for you shall not apply and the
Company will continue to furnish you with such coverage during your employment
hereunder.  Exhibit A to the Employment Agreement is hereby amended by deleting
it in its entirety and substituting Exhibit A attached hereto.



     (b)  In the event of a termination by the Company of your employment
hereunder, before or after the Change Date, other than for cause or permanent
total disability, or in the event of a termination by you of your employment
hereunder, before or after the Change Date, under circumstances constituting
Constructive Termination, in either event before you reach age 65, then you
will continue to be entitled to the benefits set forth in subparagraphs 6(a),
as modified by the foregoing subparagraph 5(a) of this letter agreement,
through (d) of the Employment Agreement (other than vacation pay) if and to the
extent permitted under the Company's benefit plans, until age 65.  In the event
of a termination by the Company of your employment as a result of your
permanent total disability (as defined in subparagraph 13(d) below) in
accordance with subparagraph 11(c) below, before you reach age 65, then you
will continue to be entitled to the group medical and dental benefits as
provided from time to time by the Company for its senior management and to the
life insurance as provided in subparagraph 6(b) of the Employment Agreement, as
amended hereby, until age 65.  Notwithstanding the foregoing provisions of this
subparagraph (b), if any particular benefit plan does not permit your continued
coverage by such plan, then the Company will pay to you an amount equal to the
premium necessary for you to obtain substantially equivalent coverage as
provided to you through the Company immediately prior to such termination and
your retirement benefits shall be determined as provided in paragraph 6 below.
The benefits under subparagraph 6(e) of the Employment Agreement shall be
determined as provided in subparagraph (c) below.

     (c)  In addition, after a termination, before or after the Change Date,
(i) by the Company of your employment hereunder, other than for cause or
permanent total disability, (ii) by you of your employment hereunder, under
circumstances constituting Constructive Termination, or (iii) by you of your
employment after you have reached age 61, then as long as 
<PAGE>   4

Mr. James L. Vincent
November 21, 1996
Page 4


you continue to located within the principal executive offices of the Company,
(2) secretarial support, (3) other support in connection with your activities
that you undertake on behalf of and at the request of the Company, and (4) the
benefits provided for in subparagraph 6(e) of the Employment Agreement.

     6.   RETIREMENT.  The Company will provide, through an amendment to the
Biogen, Inc. Supplemental Executive Retirement Plan (the "SERP") or otherwise,
that:

     (a)   during the period following the Change Date while you continue to
serve as Chairman (including during any period while you have a condition or
other disability for which you are entitled to payment of disability benefits
for a "covered disability," as defined in the Biogen Retirement Plan) you will
continue to accrue additional retirement benefits calculated under the SERP's
supplemental pension formula, treating your service as Chairman as if it were
full-time service as an eligible employee and treating the salary and bonus
paid to you for service as Chairman (which during any period of "covered
disability" shall be deemed to be the salary and bonus for the year immediately
preceding such period) as your "applicable compensation" for purposes of the
SERP's supplemental pension formula;
<PAGE>   5

Mr. James L. Vincent
November 21, 1996
Page 5


     (b)  in the event of a termination of your employment, before or after
permanent total disability, (ii) by you hereunder, under circumstances
constituting Constructive Termination, or (iii) by you after you have reached
age 61, in each case before you reach age 65, you will receive additional
retirement benefits calculated under the SERP's supplemental pension formula
as if you had continued to serve as Chairman until age 65 and had continued
to receive the same compensation as the annual rate of compensation in effect
for you immediately prior to such termination of employment; and

     (c)  in the event of a termination of your employment as Chairman
before age 65, under circumstances entitling you to benefit payments under
subparagraph (a) or (b) above or from the SERP, you may thereafter elect to
commence receiving such benefit payments under either clause (i) or (ii) below:

     (i)  in the event your employment is terminated under circumstances
          entitling you to a payment under paragraph 11(c)(v) of this letter
          agreement, starting on the earlier of:

          (A)     your normal retirement date, or

          (B)     the date which follows the date of termination of your
                  employment by a number of months equal to the Severance
                  Multiple (as defined in paragraph 11(c)(v) of this letter
                  agreement) multiplied by 12, 

     (ii) in the event your employment is terminated under circumstances
          not entitling you to a payment under paragraph 11(c)(v) of this
          letter agreement, starting on the date of such termination,

     and benefit payments starting on any such date will not be reduced for
     payments received before your normal retirement date.

     For example, if the Change Date occurs on your 57th birthday, and your
     employment is terminated by the Company on your 58th birthday under
     circumstances entitling you to a payment under paragraph 11(c)(v) of this
     letter agreement, then your Severance Multiple would be 5.5 which,
     multiplied by 12, results in a period of 66 months.  Therefore, in this
     example, pursuant to subparagraph (c)(i)(B), you could elect to commence
     receiving benefit payments at the time you reach age 632 (which is 66
     months after the assumed date of termination of your employment at age 58)
     without reduction for payments received before your normal retirement
     date.
<PAGE>   6

Mr. James L. Vincent
November 21, 1996
Page 6


The rules governing the presumed form of payment for calculations of benefit
amounts under the foregoing provisions of this paragraph, and the rules
governing the conversion of actual benefits into any other form of payment
elected by you, will be the same rules used for such purposes under the Biogen
Retirement Plan and the SERP.
<PAGE>   7

Mr. James L. Vincent
November 21, 1996
Page 7


If the foregoing benefits are not provided through an amendment to the SERP,
provisions of this letter agreement and the actual amount payable to you
hereunder will be such amount reduced by the amounts you actually receive from
the SERP and the Biogen Retirement Plan.

     7.   OPTIONS.     (a)  In connection with your initial employment by
Biogen, you were granted an option for 600,000 shares of the common stock of
Biogen N.V., which option has been fully exercised.  The options that have been
granted to you from time to time, including the initial option, are as set
forth on the attached Exhibit B.  On September 22, 1995, you were granted a
stock option for 300,000 shares of the common stock of the Company pursuant to
a Stock Option Agreement (the "1995 Option Agreement"), which option has not
been exercised.

     (b)  You will be eligible, during your employment before and after the
Change Date, for grants of stock options from time to time, in the discretion
of the Stock Option Committee of the Board.  In the event of any such grant
after the date hereof, to the extent permitted under the applicable plan, law
and regulations, each such option shall have the following terms:

     (i)  The exercise period of the option shall be equal to the option's
          full term, which is currently expected to be ten years, unless your
          employment is terminated by the Company for cause; and

     (ii) such other terms (other than exercise price) at least as favorable
          to you as are contained in the 1995 Option Agreement.

     (c)  The provisions in subparagraph 8(a) of the Employment Agreement
pertaining to the filing of a registration statement on Form S-3 or Form
S-8/S-3 or other "short-form" registration statement shall apply to any options
granted during your employment.

     8.   DEFINITION OF CAUSE.  The definition of "cause" set forth in
subparagraph 8(e) of the Employment Agreement is modified by replacing the
reference to "Supervisory Board" in clause (i) thereof with the "Board".

     9.   DEFINITION OF CONSTRUCTIVE TERMINATION.  The definition of
"Constructive Termination" set forth in subparagraph 8(f) of the Employment
Agreement is modified by deleting subparagraph (f) thereof in its entirety and
replacing it with the following:

     (f)  "CONSTRUCTIVE TERMINATION."  As used herein, Constructive
Termination shall mean your written notice of resignation as an employee and
officer of the Company within ninety (90) days following the occurrence of any
one or more of 
<PAGE>   8

Mr. James L. Vincent
November 21, 1996
Page 8
      
          the following events ("Termination Events"):

    (i)   a Change of Control (as defined below);

    (ii)  whether before or after a Change of Control, failure of the
          shareholders of the Company to reelect you to the Board or failure
          of the Board to reelect you as Chairman, as a member of the
          Compensation and Management Development Committee of the Board, as
          a member of the Nominating Committee of the Board, or as Chairman
          of the Executive Committee of the Board, if and when such Executive
          Committee is created, or, prior to the Change Date, failure of the
          Board to reelect you as Chief Executive Officer, or your removal from
          any such office or position; or

    (iii) whether before or after a Change of Control, (A) a material change
          by the Company in your functions, duties or responsibilities other
          than those enumerated in clause (ii) above, including, but not
          limited to, material changes in the control and structure of the
          Company, any of which cause your position with the Company to become
          of less dignity, responsibility, importance or scope from the
          positions provided for in paragraph 1 above or (B) management conduct
          or policies which interfere with the performance of your duties
          hereunder; provided, however, that in order for any circumstances
          described in this clause (iii) to constitute a Termination Event,
          you shall give written notice to the Board, within sixty (60) days
          after such circumstances arise, that you consider such circumstances
          to be a Termination Event and such circumstances shall continue
          without affirmative action by the Company to remedy the same for a
          period of fifteen (15) days after receipt of such notice.

     If you decide to resign in such circumstances, your resignation shall be
     accompanied by a letter containing an explanation of the reasons for the
     resignation.

     Notwithstanding any other provisions of this paragraph 8(f), in no event
     shall (x) a voluntary reduction in the time you devote to the affairs of
     the Company after the Change Date, as permitted by paragraph 1 above, (y)
     the election of another person as Chief Executive Officer upon your
     recommendation, or (z) a termination by the Company of your employment
     for cause or a termination of your employment as a result of death or
     permanent total disability constitute a Termination Event.

     10.  DEFINITION OF CHANGE OF CONTROL.  As used in this letter
agreement, "Change of Control" shall mean any of the following shall have
occurred:
<PAGE>   9

Mr. James L. Vincent
November 21, 1996
Page 9


     (a)  individuals who, as of the date hereof, constitute the entire
Board of Directors of the Company (the "Incumbent Directors") cease for any
reason to constitute at least 50% of the Board, provided that any individual
becoming a Director subsequent to the date hereof whose election, or nomination
for election by the Company's shareholders, was approved by a vote of at least
a majority of the then Incumbent Directors shall be, for purposes of this
letter agreement, considered as though such individual were an Incumbent
Director; or

     (b)  any "person", as such term is used in Section 13(d) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act") (or any
successor provision) (other than the Company, any employee benefit plan of the
Company or any entity organized, appointed or established by the Company for or
pursuant to the terms of such plan), together with all "affiliates" and
"associates" (as such terms are defined in Rule 12b-2 under the Exchange Act or
any successor provisions) of such person, shall become the "beneficial owner"
or "beneficial owners" (as defined in Rules 13d-3 and 13d-5 under the Exchange
Act or any successor provisions), directly or indirectly, of securities of the
Company representing in the aggregate 30% or more of either (a) the then
outstanding shares of common stock of the Company or (b) the combined voting
power of all then outstanding securities of the Company having the right under
ordinary circumstances to vote in an election of the Board ("Voting
Securities") (in either such case, other than as a result of acquisitions of
such securities directly from the Company) (hereafter referred to as a "30%
Acquisition"); provided, that, notwithstanding the foregoing, a 30% Acquisition
shall not be deemed to have occurred for purposes of this subparagraph (b) (i)
solely as the result of an acquisition of securities by the Company which, by
reducing the number of shares of common stock or other Voting Securities
outstanding, increases (A) the proportionate number of shares of common stock
beneficially owned by any person to 30% or more of the common stock then
outstanding or (B) the proportionate voting power represented by the Voting
Securities beneficially owned by any person to 30% or more of the combined
voting power of all then outstanding Voting Securities or (ii) solely as the
result of an acquisition of securities from the Company; except that if any
person referred to in clause (i)(A) or (i)(B) of this sentence or to which
clause (ii) of this sentence is applicable shall thereafter become the
beneficial owner of any additional shares of Common Stock or other Voting
Securities (other than pursuant to a stock split, stock dividend or similar
transaction or a transaction to which clause (ii) applies), then a 30%
Acquisition shall be deemed to have occurred for purposes of this subparagraph
(b); and

     (c)  in the event of (i) the effectiveness of any consolidation or
merger of the Company (A) where the shareholders of the Company, immediately
prior to the consolidation or merger, would not, immediately after the
consolidation or merger, beneficially own, directly or indirectly, shares
representing in the aggregate more than 50% of the combined voting power of all
the outstanding securities of the corporation issuing cash or securities in the
consolidation or merger (or of its ultimate parent corporation, if any) or (B)
where the members of the Board,
<PAGE>   10

Mr. James L. Vincent
November 21, 1996
Page 10


immediately prior to the consolidation constitute more than 50% of the board of
directors of the corporation issuing cash or securities in the consolidation or
merger (or of its ultimate parent corporation, if any), (ii) any sale, lease,
exchange or other transfer (in one transaction or a series of transactions
contemplated or arranged by any party as a single plan) of all or substantially
all of the assets of the Company or (iii) the adoption by the Board or the
shareholders of the Company of any plan or proposal for the liquidation or
dissolution of the Company.

     11.  TERMINATION AND POST-TERMINATION COMPENSATION.

     (a)  Paragraph 9 of the Employment Agreement is hereby amended as follows:

          (i)     by inserting before the first sentence the following: "The
                  provisions of this paragraph 9 shall apply so long as you
                  are the Chief Executive Officer of the Company."

          (ii)    by deleting subparagraph (b) thereof and inserting the
                  following:

                      (b)     any options that have been granted to you prior
                  to the termination date shall be exercisable in accordance
                  with their terms.

     (b)  Notwithstanding the provisions of paragraph 9 of the Employment
Agreement, as amended hereby, in the event of a termination of your employment
before the Change Date, the provisions of paragraphs 5 and 6 of this letter
agreement will apply with respect to benefits to be provided to you and amounts
payable to you thereunder.  In any event, termination of your employment for
permanent total disability, before or after the Change Date, shall not be
deemed to be a termination of your employment by you.

     (c)  After the Change Date, your employment will terminate immediately
upon written notice from either you or the Company.  For purposes of this
letter agreement, a failure of the Company to give you notice prior to the
expiration of the Initial Chairmanship Term of an extension of the term of your
employment for a period of at least three years shall constitute a termination
of your employment by the Company without cause.  After the Change Date, in the
event of your permanent total disability, the Company may terminate your
employment for such reason, upon written notice expressly stating the reason
therefor.  Upon any termination of your employment on or after the Change Date,
all of your rights under this letter agreement and the Employment Agreement,
including your right to any form of compensation hereunder or thereunder, will
immediately cease except as follows:
<PAGE>   11

Mr. James L. Vincent
November 21, 1996
Page 11


    (i)   you will be entitled to reimbursement, to the extent provided in
          paragraph 7 of the Employment Agreement, for reasonable expenses
          incurred by you in connection with your employment through the date
          of termination of employment;

   (ii)   the provisions of paragraph 5 above will apply with respect to
          benefits;

  (iii)   any options that have been granted to you prior to the termination
          date shall be exercisable in accordance with their terms;

   (iv)   the provisions of paragraph 6 above will apply with respect to
          amounts payable to you thereunder; and

    (v)   if, and only if, on or after the Change Date, (A) the Company
          terminates your employment, other than for cause or permanent total
          disability, or (B) you terminate your employment under circumstances
          constituting Constructive Termination, you will be entitled to
          payment of an amount equal to the Severance Multiple (determined as
          provided below) times the average of the sum of your annual salary
          and annual bonus compensation for each of the three preceding years
          completed prior to such termination, payable in a lump sum within
          thirty (30) days of such termination, subject to withholding and
          other employment-related deductions.  The Severance Multiple shall
          be 48 minus the number of full calendar months elapsed since the
          Change Date (but not less than zero) plus 30, and divided by 12,
          but in no event shall the Severance Multiple be less than 2.5.

     12.  SECRECY; HIRING PROHIBITION; NONCOMPETITION COVENANT.

     (a)  Paragraph 10(d) of the Employment Agreement is hereby amended by
deleting the two references to "one year" and substituting in their places "two
years".

     (b)  In consideration of the provisions of this letter agreement,
including paragraph 11, and other good and valuable consideration, the
sufficiency of which is hereby acknowledged, paragraph 10 of the Employment
Agreement is further amended by adding the following subparagraphs:

                  (e)  You covenant and agree that at all times you are either
          employed by Biogen or a Director of Biogen and for a period of three
          (3) years after such date as you cease to be either an employee nor
          a Director of Biogen (the "Non-Competition Period"), you will not,
          without the express written consent of the Company, engage or
          participate, directly or indirectly, as principal, agent, 
<PAGE>   12

Mr. James L. Vincent
November 21, 1996
Page 12


          employee, employer, consultant, advisor, sole proprietor, any other
          individual or representative capacity whatever, in the conduct or
          management of, or own any stock or other proprietary interest in, or
          debt of, any business organization, person, firm, partnership,
          association, corporation, enterprise or other entity that (i) shall
          be engaged in the sale of a product which is directly competitive
          with a product Biogen or any Affiliate is selling or (ii) is seeking,
          or which has publicly announced its intention to seek, control,
          directly or indirectly, of Biogen or any Affiliate, except that you
          shall be free to make investments in any company whose stock is
          listed on a national securities exchange or traded in the
          over-the-counter market so long as you do not own, directly or
          indirectly, more than one percent (1%) of the equity securities of
          such company.
        
        
                  (f)  You acknowledge that your skills and experience are such
          that you can anticipate finding employment at a senior level in your
          profession and represent and agree that the restrictions imposed by
          this paragraph 10 on engaging in competitive business activities are
          necessary for the protection of the legitimate interests and
          competitive position of the Company and do not impose undue hardships
          on you.

                  (g)  You acknowledge and agree that the remedy at law of the
          Company for any breach of any of your obligations under this
          paragraph 10 and the Employee's Proprietary Information and
          Inventions Agreement dated May 30, 1991 (the "Confidentiality
          Agreement") would be inadequate, and that in the event of such breach
          the Company shall have, in addition to any and all remedies at law,
          the right to temporary and permanent injunctions, specific
          performance and other equitable relief to prevent the violation of
          your obligations hereunder and thereunder, without the necessity of
          proof of any actual damage.

     13.  MISCELLANEOUS.  (a)  Subparagraph 12(d) of the Employment
Agreement is hereby amended by substituting the following address for the
addresses set forth after the clauses "if sent to you" and "with a copy to":

          If sent to you:     Mr. James L. Vincent
                              7 Audubon Road
                              Weston, MA  02193

     (b)  Subparagraph 12(e) of the Employment Agreement is hereby amended by
          deleting

<PAGE>   13

Mr. James L. Vincent
November 21, 1996
Page 13


in its entirety. It is agreed that the Employment Agreement and the Exhibits
thereto, each as amended and supplemented by this letter agreement, this letter
agreement, Exhibits A and B hereto, the Confidentiality Agreement, the stock
option agreements pertaining to any options listed on Exhibit A to this letter
agreement, the SERP and the Biogen Retirement Plan constitute the entire
agreement and understanding between the parties hereto in relation to the
subject matter hereof and there are no promises, representations, conditions,
provisions or terms related thereto other than those set forth in this letter
agreement, the Employment Agreement and the Exhibits thereto, each as amended
and supplemented by this letter agreement, Exhibits A and B hereto, the
Confidentiality Agreement, such stock option agreements, the SERP and the
Biogen Retirement Plan.  This letter agreement supersedes all other previous
understandings, agreements and representations between the Company and you
regarding your employment by the Company, written or oral.

     (c)  Subparagraph 12(h) of the Employment Agreement is hereby amended
by deleting it in its entirety and substituting the following:

          (h)     As used herein, the term "Affiliate" shall be deemed to
     include Biogen Securities Corp., Biogen Realty Corp., Biogen GmbH,
     Biogen Limited, Biogen France, S.A., Biogen International Ltd., and
     Biogen Netherlands B.V., or any predecessor or successor to any of such
     entities, or any corporation, joint venture or other business enterprise,
     whether incorporated or unincorporated, in which Biogen Securities Corp.,
     Biogen Realty Corp., Biogen GmbH, Biogen Limited, Biogen France, S.A.,
     Biogen International Ltd., and Biogen Netherlands B.V., or any predecessor
     or successor to any of such entities, has a beneficial or voting interest
     of nineteen percent or more.

     (d)  As used in this letter agreement, the term "permanent total
disability" shall mean a physical or mental condition resulting in your
inability for a period of twelve (12) consecutive months substantially to
perform your duties, at the end of which period the Board believes there to be
little likelihood of your complete recovery.

     (e)  Subparagraph 12(n) of the Employment Agreement is hereby deleted.

     (f)  Except as amended hereby, the provisions of paragraph 12 of the
Employment Agreement shall apply to this letter agreement.

     (g)  Neither this letter agreement nor the Employment Agreement may be
amended, except in writing, in a document duly signed on behalf of the Company
and by you.

     If you agree with the terms of this letter agreement, please execute the
duplicate copies
<PAGE>   14

Mr. James L. Vincent
November 21, 1996
Page 14

hereof in the space provided below.  It is intended that this letter agreement 
take effect as an instrument under seal.


                               Very truly yours,

                               Biogen, Inc.


Date:___________________       By: ______________________________
                                   Roger H. Morley
                                   Chairman, Compensation and
                                   Management Resources Committee
                                   

Date:___________________       By: _______________________________
                                   Harold W. Buirkle
                                   Member, Compensation and
                                   Management Resources Committee
                                   

Date:___________________       By: _______________________________
                                   Phillip A. Sharp
                                   Member, Compensation and
                                   Management Resources Committee



Acknowledged and Agreed:


________________________
James L. Vincent


Date:___________________


<PAGE>   15


                                   EXHIBIT A

                          Disability Insurance Program
                          ----------------------------


1.     Inclusion in the Company's Group Program.

2.     Coverage under a policy provided by the John Hancock Insurance Company
       and/or other carriers, providing for additional benefits until age 65,
       which together with the benefits under the Company's Group Program,
       aggregate 70% of your base salary.






<PAGE>   16

<TABLE>
                                                      EXHIBIT B

                                                 STOCK OPTION SUMMARY



GRANT         GRANT     PLAN/
NUMBER        DATE      TYPE      GRANTED      PRICE    EXERCISED     VESTED     CANCELLED    UNVESTED    OUTSTANDING    
- ------        -----     -----     -------      -----    ---------     ------     ---------    --------    -----------   
EXERCISABLE
- -----------
<S>          <C>        <C>     <C>          <C>         <C>        <C>          <C>          <C>             <C>            
0T2254       09/23/85   EX/NQ     600,000      $8.620    600,000      600,000            0           0              0    
0T0254       11/19/87   EX/NQ     150,000      $4.250    150,000      150,000            0           0              0    
000242       12/02/88   EX/NQ     150,000      $7.375    100,000      150,000            0           0         50,000    
000480       12/01/89   EX/NQ      75,000     $17.500          0       75,000            0           0         75,000    
000572       12/07/90   EX/NQ      45,000     $25.563          0       45,000            0           0         45,000    
000851       12/06/91   85/NQ      50,000     $41.500          0       50,000            0           0         50,000    
001274       12/10/92   85/NQ     200,000     $44.125          0      200,000            0           0        200,000    
002123       09/22/95   85/NQ     300,000     $53.958          0      300,000            0           0        300,000    
             --------           ---------    --------    -------    ---------            -           -        -------     
               Totals           1,570,000    [$23.223]   850,000    1,570,000            0           0        720,000
              720,000
</TABLE>




T3/616440.1


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