IMMUNEX CORP /DE/
DEF 14A, 1996-03-27
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                            ------------------------
 
                            SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
                      the Securities Exchange Act of 1934
 
    Filed by the Registrant /X/
    Filed by a Party other than the Registrant / /
 
    Check the appropriate box:
    / /  Preliminary Proxy Statement
    /X/  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12
 
                                      IMMUNEX CORPORATION
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  $125 per Exchange Act Rule 0-11(c)(1)(ii), 14a-6(i)(1), or 14a-6(i)(2)
/ /  $500  per  each party  to  the controversy  pursuant  to Exchange  Act Rule
     14a-6(i)(3)
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11
Calculation of Filing Fee:
     1) Title of each class of securities to which transaction applies:
        ------------------------------------------------------------------------
     2) Aggregate number of securities to which transaction applies:
        ------------------------------------------------------------------------
     3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11:
        ------------------------------------------------------------------------
     4) Proposed maximum aggregate value of transaction:
        ------------------------------------------------------------------------
/ /  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the  filing for which the  offsetting fee was  paid
     previously.  Identify the previous filing by registration statement number,
     or the form or schedule and the date of its filing.
     1) Amount previously paid:
        ------------------------------------------------------------------------
     2) Form, schedule or registration statement no.:
        ------------------------------------------------------------------------
     3) Filing party:
        ------------------------------------------------------------------------
     4) Date filed:
        ------------------------------------------------------------------------
<PAGE>
                              IMMUNEX CORPORATION
 
                                ----------------
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
 
                      TO BE HELD THURSDAY, APRIL 25, 1996
 
                            ------------------------
 
To the Shareholders of Immunex Corporation:
 
    NOTICE  IS HEREBY GIVEN  that the Annual Meeting  of Shareholders of IMMUNEX
CORPORATION, a  Washington corporation  (the  "Company"), will  be held  at  the
Immunex  Manufacturing  and  Development  Center,  21511  23rd  Drive Southeast,
Bothell, Washington,  on  Thursday,  April 25,  1996  at  9:00 a.m.  or  at  any
adjournment  or postponement  thereof (the  "Annual Meeting")  for the following
purposes:
 
    1. To elect nine directors to serve until the Annual Meeting of Shareholders
       next ensuing after their election  and until their respective  successors
       are elected and shall qualify; and
 
    2. To  consider and transact such other business as may properly come before
       the Annual Meeting or any adjournment or postponement thereof.
 
The foregoing items of business are more fully described in the Proxy  Statement
accompanying this Notice.
 
    The  Company's Board of Directors  has fixed the close  of business on March
13, 1996 as the  record date for the  determination of shareholders entitled  to
notice of, and to vote at, the Annual Meeting.
 
    To  ensure representation at  the Annual Meeting,  shareholders are urged to
mark, sign, date and return the enclosed Proxy as promptly as possible, even  if
they  plan to attend  the Annual Meeting.  A return envelope,  which requires no
postage if  mailed in  the United  States,  is enclosed  for this  purpose.  Any
shareholder  attending  the  Annual Meeting  may  vote  in person  even  if such
shareholder has returned a Proxy if the Proxy is revoked in the manner set forth
in the accompanying Proxy Statement.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS
 
                                          Scott G. Hallquist
                                          SECRETARY
 
Seattle, Washington
March 26, 1996
 
  PLEASE NOTE  THAT  ATTENDANCE  AT  THE  ANNUAL  MEETING  WILL  BE  LIMITED  TO
SHAREHOLDERS  OF  THE  COMPANY  AS  OF  THE  RECORD  DATE  (OR  THEIR AUTHORIZED
REPRESENTATIVES) AND GUESTS OF THE COMPANY.  TO OBTAIN AN ADMITTANCE TICKET  AND
DIRECTIONS  TO  THE  MANUFACTURING  AND  DEVELOPMENT  CENTER,  PLEASE  MARK  THE
APPROPRIATE BOX ON THE ENCLOSED PROXY AND AN ADMITTANCE TICKET AND A MAP WILL BE
SENT TO YOU. IF  YOUR SHARES ARE  HELD BY A  BANK OR BROKER,  YOU MAY OBTAIN  AN
ADMITTANCE  TICKET AND A  MAP BY RETURNING  THE REQUEST CARD  PROVIDED TO YOU BY
YOUR BANK OR BROKER.
<PAGE>
                              IMMUNEX CORPORATION
                               ------------------
 
                                PROXY STATEMENT
 
                            ------------------------
 
                 INFORMATION CONCERNING SOLICITATION AND VOTING
 
GENERAL
 
    The  enclosed  Proxy  is solicited  by  the  Board of  Directors  of Immunex
Corporation ("Immunex"  or the  "Company")  for use  at  the Annual  Meeting  of
Shareholders  to be  held on  Thursday, April 25,  1996 at  9:00 a.m.  or at any
adjournment or postponement thereof (the "Annual Meeting") for the purposes  set
forth  herein and in the accompanying  Notice of Annual Meeting of Shareholders.
The Annual Meeting  will be held  at the Immunex  Manufacturing and  Development
Center, 21511 23rd Drive Southeast, Bothell, Washington. The principal executive
offices  of the Company are located at 51 University Street, Seattle, Washington
98101.
 
    The Company intends to first give or mail to shareholders definitive  copies
of this Proxy Statement and accompanying Proxy on or about March 26, 1996.
 
RECORD DATE AND OUTSTANDING SHARES
 
    Only  holders of record at the close of business on March 13, 1996 of shares
of common stock of the Company (the  "Common Stock") will be entitled to  notice
of,  and to  vote at, the  Annual Meeting. At  that date, there  were issued and
outstanding 39,601,899 shares of Common Stock.
 
REVOCABILITY OF PROXIES
 
    Any shareholder giving a Proxy has the power to revoke it at any time before
it is exercised. A Proxy may be revoked either by (i) filing with the  Secretary
of  the Company prior to the Annual Meeting, at the Company's executive offices,
either a written revocation  or a duly  executed Proxy bearing  a later date  or
(ii)  attending the Annual Meeting and voting in person, regardless of whether a
Proxy has previously been given. Presence at the Annual Meeting will not  revoke
the shareholder's Proxy unless such shareholder votes in person.
 
QUORUM
 
    A  quorum for the Annual Meeting shall  consist of the holders of a majority
of the  outstanding  shares of  Common  Stock entitled  to  vote at  the  Annual
Meeting, present in person or by proxy.
 
SOLICITATION OF PROXIES
 
    The  Company has  retained MacKenzie Partners,  Inc., 156  Fifth Avenue, New
York, New York, to aid in the solicitation of Proxies. It is estimated that  the
cost  of these services will be approximately $5,000, plus expenses. The cost of
soliciting Proxies will be  borne by the Company.  Proxies will be solicited  by
personal  interview, mail and telephone. In  addition, the Company may reimburse
brokerage firms and other  persons representing beneficial  owners of shares  of
Common  Stock for  their expenses in  forwarding solicitation  materials to such
beneficial owners. Proxies  may also be  solicited by certain  of the  Company's
directors,  officers  and  regular employees,  without  additional compensation,
personally or by telephone or telefax.
 
VOTING
 
    Each shareholder will be entitled to one vote for each share of Common Stock
held. Directors will be  elected by a  plurality of the  shares of Common  Stock
present by proxy or in person at the Annual Meeting. Holders of Common Stock are
not  entitled to  cumulate votes in  the election of  directors. Abstention from
voting and broker nonvotes on the election  of directors will have no impact  on
the outcome of this proposal.
 
                                       1
<PAGE>
    The  Company is not aware, as of the date hereof, of any matters to be voted
upon at the Annual Meeting  other than as stated  in the accompanying Notice  of
Annual Meeting of Shareholders. The enclosed Proxy gives discretionary authority
to  the persons named therein  to vote the shares in  their best judgment if any
other matters are properly brought before the Annual Meeting.
 
                     PRINCIPAL HOLDERS OF VOTING SECURITIES
 
    The following table sets forth as  of December 31, 1995 certain  information
regarding  all shareholders known by the Company  to be the beneficial owners of
more than  5% of  the outstanding  voting securities  of the  Company, based  on
publicly  available  information.  To the  Company's  knowledge,  the beneficial
owners listed below have  sole voting and investment  power with respect to  the
shares shown as beneficially owned.
 
<TABLE>
<CAPTION>
                                                                                        AMOUNT AND
                                                                                        NATURE OF
NAME AND ADDRESS OF                                                                     BENEFICIAL      PERCENT OF
BENEFICIAL OWNER                                                  TITLE OF CLASS        OWNERSHIP          CLASS
- --------------------------------------------------------------  ------------------  ------------------  -----------
<S>                                                             <C>                 <C>                 <C>
American Cyanamid Company (1).................................        Common Stock        21,513,752         54.3%
One Cyanamid Plaza
Wayne, New Jersey 07470
Wellington Management Company.................................        Common Stock         2,930,660          7.4%
75 State Street
Boston, Massachusetts 02109
</TABLE>
 
- ------------------------
(1) American  Cyanamid  Company ("Cyanamid")  is  a wholly  owned  subsidiary of
    American Home Products Corporation ("American Home Products" or "AHP").
 
SECURITY OWNERSHIP OF MANAGEMENT
 
    The following  table  sets  forth  as  of March  13,  1996,  the  number  of
outstanding  voting securities  of the  Company beneficially  owned by  (i) each
director and  each  nominee,  (ii)  each of  the  executive  officers  for  whom
compensation is reported in this Proxy Statement and (iii) all current directors
and executive officers as a group:
 
<TABLE>
<CAPTION>
                                                                AMOUNT AND
                                                           NATURE OF BENEFICIAL   PERCENT OF
NAME OF BENEFICIAL OWNER                  TITLE OF CLASS        OWNERSHIP           CLASS
- ----------------------------------------  --------------   --------------------   ----------
<S>                                       <C>              <C>                    <C>
Steven Gillis...........................    Common Stock        460,262(1)          1.2%
Scott G. Hallquist......................    Common Stock         49,928(2)          *
Michael L. Kranda.......................    Common Stock         47,837(2)          *
Edward V. Fritzky.......................    Common Stock         42,700(3)          *
Douglas G. Southern.....................    Common Stock         22,034(4)          *
Douglas E. Williams.....................    Common Stock          8,463(5)          *
Kirby L. Cramer.........................    Common Stock          5,000(6)          *
Edith W. Martin.........................    Common Stock          5,000(6)          *
John E. Lyons...........................    Common Stock          4,000(6)          *
Richard L. Jackson......................    Common Stock          1,000             *
Joseph J. Carr..........................    Common Stock            --              --
Robert A. Essner........................    Common Stock            --              --
All current directors and executive
 officers as a group (16 persons).......    Common Stock        646,224            1.6
</TABLE>
 
- ------------------------
*   Less than 1% of the outstanding shares of Common Stock.
 
(1) Excludes  39,000 shares of Common Stock  held by three trusts established by
    Dr. Gillis for the benefit of his  family. Dr. Gillis is not the trustee  of
    such trusts and disclaims beneficial ownership of such shares.
 
                                       2
<PAGE>
(2) Includes 28,166 shares that are issuable upon exercise of stock options that
    are currently exercisable or are exercisable within 60 days.
 
(3) Includes 40,500 shares that are issuable upon exercise of stock options that
    are currently exercisable or are exercisable within 60 days.
 
(4) Includes 17,500 shares that are issuable upon exercise of stock options that
    are currently exercisable or are exercisable within 60 days.
 
(5) Includes  7,400 shares that are issuable upon exercise of stock options that
    are currently exercisable or are exercisable within 60 days.
 
(6) Includes 4,000 shares that are issuable upon exercise of stock options  that
    are currently exercisable or are exercisable within 60 days.
 
                             ELECTION OF DIRECTORS
 
    A  Board of Directors  consisting of nine  directors will be  elected at the
Annual Meeting to hold office for a  term of one year or until their  successors
are elected and shall qualify.
 
    Pursuant  to  the  Amended and  Restated  Governance Agreement  dated  as of
December 15, 1992  (the "Governance  Agreement"), AHP is  entitled to  designate
three  Investor Directors  (as defined below)  and one  Independent Director (as
defined below)  for  election  to  the  Board of  Directors.  AHP  has  not  yet
designated  a candidate  to serve  as an  Independent Director.  However, AHP is
expected to
designate a director nominee for election by the Board of Directors, and may  do
so  at any time.  See "Relationship With American  Home Products Corporation and
American Cyanamid Company -- Governance  Agreement -- Designation of  Candidates
for  Board  of Directors."  Proxies may  not be  voted for  a greater  number of
persons than the number of nominees named.
 
    The Board  of Directors  has approved  the nominees  named below,  who  were
designated  in  accordance  with  the  Governance  Agreement.  Unless  otherwise
instructed, it is the intention of  the persons named in the accompanying  Proxy
to  vote  shares represented  by properly  executed  Proxies for  such nominees.
Although the  Board of  Directors  anticipates that  all  the nominees  will  be
available  to serve as directors of the Company,  should any one or more of them
not accept the nomination, or otherwise be  unwilling or unable to serve, it  is
intended  that the  Proxies will  be voted for  the election  of such substitute
nominees as may be designated in accordance with the Governance Agreement.
 
    The following table sets forth the name and age of each nominee for election
as a director, the positions  and offices held by  the nominee with the  Company
and the period during which the nominee has served as a director of the Company:
 
<TABLE>
<CAPTION>
                                                                                                  DIRECTOR
          NAME                AGE               POSITIONS AND OFFICES WITH THE COMPANY              SINCE
- ------------------------      ---      --------------------------------------------------------  -----------
<S>                       <C>          <C>                                                       <C>
Edward V. Fritzky             45       Chief Executive Officer; Chairman of the Board               1994
Michael L. Kranda             42       President; Chief Operating Officer; Director                 1991
Joseph J. Carr                53       Director                                                     1995
Kirby L. Cramer               59       Director                                                     1987
Robert A. Essner              48       Director                                                     1995
Richard L. Jackson            56       Director                                                     1995
John E. Lyons                 70       Director                                                     1993
Edith W. Martin               50       Director                                                     1993
Douglas E. Williams           37       Nominee                                                       --
</TABLE>
 
    Mr.  Fritzky was named the Company's Chief Executive Officer and Chairman of
the  Board  in  January  1994.  Mr.  Fritzky  served  as  President  of  Lederle
Laboratories  ("Lederle"), a division of Cyanamid, from 1992 to 1994 and as Vice
President   of    Lederle    from   1989    to    1992.   Prior    to    joining
 
                                       3
<PAGE>
Lederle,   Mr.  Fritzky  was  an   executive  of  Searle  Pharmaceuticals,  Inc.
("Searle"), a subsidiary of Monsanto Company.  During his tenure at Searle,  Mr.
Fritzky  was Vice President, Marketing, and  later President and General Manager
of Searle Canada, Inc. and Lorex Pharmaceuticals, a joint venture company.
 
    Mr. Kranda  has been  a director  of the  Company since  1991. He  has  been
employed  by  the  Company since  July  1985, initially  as  Director, Corporate
Development. From January  1986 to July  1988, he served  as General Manager  of
Immunology  Ventures, the Company's  partnership with Eastman  Kodak Company. In
July 1988, Mr. Kranda was elected  Executive Vice President and Chief  Operating
Officer of the Company. In October 1990, he was elected President, retaining the
office  of Chief Operating Officer. Mr. Kranda previously served as President of
Immunex Manufacturing  Corporation,  the Company's  wholly  owned  manufacturing
subsidiary. Mr. Kranda also serves as a director of the Woodland Park Zoological
Society and the Washington Research Foundation, both private nonprofit entities.
 
    Mr. Carr was elected as a director of the Company in January 1995. He joined
American  Home Products,  a leading manufacturer  of pharmaceutical, healthcare,
animal health, agricultural and  food products, in 1982,  and served in  various
executive capacities prior to being named Vice President in 1989. In April 1991,
Mr.  Carr  was appointed  Group  Vice President  of AHP,  and  in May  1993, was
appointed Senior Vice President.
 
    Mr. Cramer has  been a director  of the  Company since 1987.  Mr. Cramer  is
Chairman Emeritus of Hazleton Laboratories Corporation. He is a Trustee Emeritus
and  former President  of the University  of Virginia's  Colgate Darden Graduate
School of  Business Administration.  Mr.  Cramer is  currently Chairman  of  the
Advisory  Board of  the School of  Business Administration of  the University of
Washington. He also  serves on  the board  of directors  of Advanced  Technology
Laboratories,  Inc., Applied Bioscience  International, Commerce Bancorporation,
International Technology Corp., Landec  Corporation, Unilab, Inc., The  Commerce
Bank  of  Washington,  Northwestern  Trust  Company  and  other  privately  held
companies. Mr. Cramer is the Chair  of the Compensation Committee and the  Stock
Option Plan Administration Committee.
 
    Mr.  Essner was  elected as a  director of  the Company in  January 1995. He
joined American  Home Products  in  1989 as  Senior  Vice President,  Sales  and
Marketing,  of its Wyeth-Ayerst Laboratories division ("Wyeth-Ayerst"). In 1991,
he was appointed Executive Vice President,  and in March 1993, he was  appointed
President,  of Wyeth-Ayerst.  Prior to joining  AHP, Mr. Essner  was employed by
Sandoz  Pharmaceuticals  Corporation  for  13  years,  most  recently  as  Chief
Operating Officer.
 
    Dr. Jackson was elected as a director of the Company in July 1995. He joined
American  Home Products  in 1993  as Vice  President, Discovery  Research of its
Wyeth-Ayerst division. Prior  to joining AHP,  Dr. Jackson was  employed by  the
Marion  Merrell Dow  Research Institute for  eight years, most  recently as Vice
President, Research Sciences.
 
    Mr. Lyons has been a director of  the Company since 1993. Mr. Lyons  retired
as  Vice Chairman of the  Board of Merck & Company  ("Merck") in 1991. He joined
Merck in 1950 as a  Research Chemist and held a  number of senior marketing  and
sales  positions in the Merck,  Sharp & Dohme division  of Merck, serving as its
President from 1975 to 1985. He was appointed Corporate Senior Vice President of
Merck in 1982, Executive Vice President in 1985, and Vice Chairman of the  Board
in  1988.  Mr.  Lyons  also  serves  on  the  board  of  directors  of  Synaptic
Pharmaceutical Company and Matrix Pharmaceutical Company.
 
    Dr. Martin has been a director of the Company since 1993. Dr. Martin is  the
Information  Services and Chief  Technology Officer of  Eastman Kodak Company, a
position she has held since February  1996. Between September 1994 and  February
1996,  Dr. Martin was the Executive  Vice President and Chief Technology Officer
of the  Student Loan  Marketing  Association ("Sallie  Mae"). Prior  to  joining
Sallie  Mae, Dr. Martin had been Vice President and Chief Information Officer of
the International Telecommunications  Satellite Organization ("INTELSAT")  since
1992. Prior to joining INTELSAT,
 
                                       4
<PAGE>
Dr.  Martin was Vice President, High  Technology Center, The Boeing Company. Dr.
Martin  also  serves  on  the  board   of  directors  of  Medtronic,  Inc.   and
International Resources, Inc. Dr. Martin is the Chair of the Audit Committee.
 
    Dr.  Williams joined  the Company  in 1988. He  served as  Vice President of
Research and Development from 1992 until  September 1994, when he was  appointed
to  his  current  position of  Senior  Vice President,  Discovery  Research. Dr.
Williams was elected an  executive officer of the  Company in February 1995.  He
received a Ph.D. in physiology from the State University of New York at Buffalo,
Roswell Park Memorial Institute Division.
 
INFORMATION ON COMMITTEES OF THE BOARD OF DIRECTORS AND MEETINGS
 
    During the last fiscal year there were eight meetings of the Company's Board
of  Directors.  All  incumbent directors  attended  at  least 75%  of  the Board
meetings held and at least 75% of the Committee meetings held of which they were
a member.
 
    In  accordance  with  the  Governance  Agreement,  the  Board  of  Directors
maintains  an Audit Committee, a  Compensation Committee, a Nominating Committee
and a Stock Option Plan Administration Committee.
 
    The Audit Committee, currently composed of Messrs. Cramer and Lyons and  Dr.
Martin,  is responsible, among  other things, for  recommending the selection of
certified public accountants to the Board of Directors, reviewing the scope  and
results  of the audits,  approving nonaudit services  performed by the certified
public  accountants  and  reviewing   the  Company's  accounting  policies   and
procedures  and system  of internal controls.  During the past  year, there were
three Audit Committee meetings.
 
    The Compensation Committee, currently composed  of Messrs. Carr, Cramer  and
Lyons  and Dr. Martin,  is responsible, among other  things, for recommending to
the Board of Directors the adoption and amendment of all employee benefit  plans
and  arrangements and the engagement of,  terms of any employment agreements and
arrangements with, and terminations of,  all corporate officers of the  Company.
During the past year, there were two Compensation Committee meetings.
 
    The  Nominating Committee, currently composed of Messrs. Carr and Kranda, is
responsible for the nomination of directors and the solicitation of  shareholder
proxies. Under the Governance Agreement, designation of directors for nomination
is  to be made exclusively  by Immunex and AHP. During  the past year, there was
one Nominating Committee meeting.
 
    The Stock  Option  Plan  Administration  Committee,  currently  composed  of
Messrs.  Carr,  Cramer,  Essner  and  Lyons  and  Drs.  Jackson  and  Martin, is
responsible, among other things, for recommending to the Board of Directors  the
adoption  and  amendment  of all  stock  option  plans of  the  Company  and for
administering such plans. During  the past year, there  were three Stock  Option
Plan Administration Committee meetings.
 
COMPENSATION OF DIRECTORS
 
    Each  Independent Director  is entitled  to receive  $6,000 per  quarter and
$1,000 per quarter for serving  as the Chair of  a Committee. In addition,  each
Independent  Director is entitled to receive  $1,000 for each Board of Directors
and each Committee  meeting attended in  person and $500  for each such  meeting
attended  telephonically.  In November  1995, the  Board  of Directors  formed a
Special Committee,  composed of  the Independent  Directors and  the  Management
Directors (as defined below) to consider AHP's offer to purchase all outstanding
shares  of Common Stock  not already held by  AHP. In the  course of the Special
Committee's deliberations, nine  Special Committee meetings  were held, and  the
Independent  Directors participated in numerous  other telephone conferences and
reviewed extensive  business and  legal information.  In connection  with  their
service  on  the  Special Committee,  Dr.  Martin  and Mr.  Lyons  each received
aggregate compensation of $45,000 and Mr. Cramer received
 
                                       5
<PAGE>
$46,500. See "Relationship with American Home Products Corporation and  American
Cyanamid  Company --  Background." Management  Directors and  Investor Directors
receive no additional compensation for attending Board or Committee meetings.
 
    Under the  Company's  Stock  Option Plan  for  Nonemployee  Directors,  each
Independent  Director receives a one-time grant  of an option to purchase 10,000
shares of  Common  Stock  on the  day  such  director is  initially  elected  or
appointed to the Board of Directors. Such options vest at a rate of 20% per year
over a five-year period.
 
                                       6
<PAGE>
            RELATIONSHIP WITH AMERICAN HOME PRODUCTS CORPORATION AND
                           AMERICAN CYANAMID COMPANY
 
BACKGROUND
 
    On  June  1, 1993,  the  Company's predecessor  ("Predecessor  Immunex") was
merged  (the  "Merger")   into  Lederle  Oncology   Corporation,  a   previously
nondistinct  operating unit  of Cyanamid,  pursuant to  an Amended  and Restated
Agreement and Plan  of Merger dated  as of December  15, 1992 among  Predecessor
Immunex,  Cyanamid and certain  other parties thereto  (the "Merger Agreement").
Each share of Common Stock of Predecessor Immunex outstanding immediately  prior
to  the  effective  time of  the  Merger  (the "Effective  Time")  was converted
pursuant to the Merger into  the right to receive $21  in cash and one share  of
Common  Stock of the newly formed entity, the Company. Cyanamid contributed $350
million in cash and certain assets  and contractual obligations of its  oncology
business  in the United  States and Canada (the  "Lederle Oncology Business") to
Lederle Oncology Corporation just prior to the Effective Time. Cyanamid received
53.5% of  the  Company's  Common Stock  outstanding  immediately  following  the
Effective Time, on a fully diluted basis.
 
    Simultaneously  with entering into the Merger Agreement, Predecessor Immunex
and Cyanamid  entered into  the Governance  Agreement, which  sets forth,  among
other  things, certain agreements  of the parties relating  to (i) the corporate
governance of the Company, including the composition of its Board of  Directors,
(ii)  rights of Cyanamid  to purchase additional shares  of the Company's Common
Stock from  the Company  upon the  occurrence of  certain events,  (iii)  future
acquisitions  and  dispositions of  the Company's  securities by  Cyanamid, (iv)
rights of members of the Company's Board of Directors designated by Cyanamid  to
approve  certain corporate actions, (v) the  requirement that a supermajority of
the members  of  the Company's  Board  of Directors  approve  certain  corporate
actions,  and (vi) payments to  be made by Cyanamid to  the Company in the event
that the  products  of the  Lederle  Oncology  Business and  certain  other  new
products  of  Immunex do  not achieve  specified  revenue targets.  In addition,
pursuant to  the  Merger  Agreement,  Immunex, Cyanamid  and  certain  of  their
respective  subsidiaries entered into  certain agreements at  the closing of the
Merger  relating  to  cooperation  in  research  and  development,  supply   and
manufacture of certain products, and other matters.
 
    In  November 1994,  all the outstanding  shares of common  stock of Cyanamid
were acquired by AHP.  Cyanamid is currently a  wholly owned subsidiary of  AHP.
Pursuant  to an agreement dated September 20,  1994 between the Company and AHP,
AHP agreed not  to take  any action  to cause  Cyanamid or  its subsidiaries  to
violate  any of  their obligations to  the Company.  AHP also agreed  that if it
causes the  separate existence  of Cyanamid  or any  of Cyanamid's  subsidiaries
having  obligations to the Company  to cease, or causes  such entity to transfer
all or substantially all of its  assets, AHP will make appropriate provision  so
that  any  successor to  such entity  or transferee  of such  assets that  is an
affiliate of AHP will be bound by and required to perform its obligations to the
Company. In addition, AHP agreed it will  not take any action to cause  Cyanamid
or  its subsidiaries to  violate their obligations to  Immunex. AHP also agreed,
among other things, to be bound  by the Standstill Provisions of the  Governance
Agreement  to the extent  such provisions apply to  Cyanamid. See "-- Governance
Agreement --  Standstill  Provisions."  All  references to  AHP  in  this  Proxy
Statement  include AHP and  its subsidiaries, divisions  or affiliates that have
assumed the obligations of Cyanamid.
 
    On November 1,  1995, AHP  presented Immunex with  an offer  to acquire  the
remaining  shares of  Immunex stock not  held by  AHP for $14.50  per share. The
Company's Board of Directors formed a  Special Committee to consider the  offer,
comprising  all  directors  other  than  the  Investor  Directors.  The  Special
Committee retained Alex.  Brown &  Sons Incorporated as  its financial  advisor.
After  considering the offer and the  recommendations of its financial and legal
advisors, the Special Committee  informed AHP on November  13, 1995 that it  had
decided to reject AHP's offer as being inadequate.
 
                                       7
<PAGE>
GOVERNANCE AGREEMENT
 
    DESIGNATION OF CANDIDATES FOR BOARD OF DIRECTORS
 
    The  Company's  Board  of Directors  following  the 1996  Annual  Meeting of
Shareholders  will  consist  of  nine  directors.  Pursuant  to  the  Governance
Agreement,  three  directors are  designated for  election  by the  Company (the
"Management Directors"), three are designated for election by AHP (the "Investor
Directors"),  three  independent  directors  are  designated  for  election   by
agreement  of the Company and  AHP, and AHP has the  right to designate a fourth
independent director for election (the "Independent Directors").
 
    At all times  during the  term of the  Governance Agreement,  the number  of
directors  that AHP and  the management of  Immunex have the  right to designate
will be determined by the percentage  interest of Immunex beneficially owned  by
AHP.  If AHP's interest is:  (i) below 20%, AHP will  have no right to designate
any directors, and the  management of Immunex will  have the right to  designate
six Management Directors; (ii) 20% or above but less than 35%, AHP will have the
right  to designate  one Investor Director,  and the management  of Immunex will
have the right to  designate five Management Directors;  (iii) 35% or above  but
less  than 45%, AHP will have the right to designate two Investor Directors, and
the management  of Immunex  will have  the right  to designate  four  Management
Directors;  (iv) 45%  or above  but less than  65%, AHP  will have  the right to
designate three Investor Directors, and the management of Immunex will have  the
right  to designate three Management  Directors; and (v) 65%  or above, AHP will
have the right  to designate four  Investor Directors, by  adding an  additional
Investor  Director to the Board of Directors, and the management of Immunex will
have the right to designate three Management Directors.
 
    In the  event that  AHP's interest  is  such that  there are  more  Investor
Directors  or Management  Directors on  the Board of  Directors than  AHP or the
management of Immunex, as the  case may be, has the  right to designate, AHP  or
the  management of Immunex, as  the case may be,  will promptly cause to resign,
and take all other action reasonably  necessary to cause the prompt removal  of,
that  number of Investor Directors or Management  Directors, as the case may be,
as required to  make the remaining  number of Investor  Directors or  Management
Directors conform with the formula described in the preceding paragraph.
 
    With  certain exceptions,  AHP and  the Management  Directors will  have the
right to  designate  replacements  for  directors  designated  pursuant  to  the
Governance  Agreement by AHP  or the Management  Directors, respectively, at the
termination of  such director's  term or  upon death,  resignation,  retirement,
disqualification,  removal from  office or other  cause. The  Board of Directors
will  elect  each  person  so  designated  upon  nomination  by  the  Nominating
Committee,  which consists of an equal number of directors designated by each of
Immunex and AHP. No individual who is an officer, director, partner or principal
shareholder of any competitor of Immunex or any of its subsidiaries (other  than
AHP and its affiliates) may be designated to serve as a director of Immunex.
 
    In  any election of directors or any  meeting of the shareholders of Immunex
called expressly for the removal of directors, AHP and its affiliates will  vote
their shares of Common Stock for all nominees in proportion to the votes cast by
the  other shareholders of Immunex, except that  AHP and its affiliates may cast
any or all of their votes, in their sole discretion, (i) in favor of any nominee
designated by AHP pursuant  to the Governance Agreement  and (ii) in  connection
with any election contest to which Rule 14a-11 under the Securities Exchange Act
of  1934,  as  amended  (the  "Exchange  Act")  applies.  With  certain  limited
exceptions, in all other matters submitted to a vote of shareholders of Immunex,
AHP may vote any or all of its shares in its sole discretion.
 
    CERTAIN APPROVAL RIGHTS
 
    So long as AHP has the right to designate at least two Investor Directors to
the Board of Directors, the approval of  at least one of the Investor  Directors
will  be required for  the Board of  Directors to approve  and authorize certain
corporate actions. Such actions include, without limitation, the following:  (i)
the entry by Immunex or any of its subsidiaries into any merger or consolidation
 
                                       8
<PAGE>
or  the acquisition  by Immunex or  any of  its subsidiaries of  any business or
assets that would constitute more than 10% of the fair market value of the total
assets of Immunex and its subsidiaries; (ii) the sale, lease, pledge, grant of a
security interest in, license, transfer or  other disposal by Immunex or any  of
its  subsidiaries of more than 10% of the  fair market value of the total assets
of Immunex and its subsidiaries; (iii) with certain exceptions, the issuance  of
any  debt or equity securities  or other capital stock of  Immunex or any of its
subsidiaries; (iv) a reclassification, split, redemption or other acquisition of
any of the  debt or  equity securities  of Immunex  or any  of its  subsidiaries
(subject   to  certain  exceptions);  (v)  any  amendment  to  the  Articles  of
Incorporation or Bylaws of Immunex or any  change in the size or composition  of
the  Board  of Directors  or committee  thereof, except  in accordance  with the
Governance Agreement; (vi) the  establishment of any committee  of the Board  of
Directors  not  specifically described  in the  Governance Agreement;  (vii) any
change  in  accounting  policies  or  procedures  of  Immunex  or  any  of   its
subsidiaries;  (viii)  the  payment  or discharge  of  any  claim,  liability or
obligation other than  in the  ordinary course  of business,  except where  such
claim,  liability or obligation does not  exceed $350,000; (ix) the commencement
or termination of  any suit,  litigation or  proceeding with  respect to  patent
rights,  and any  other suit,  litigation or  proceeding that  involves a claim,
liability or obligation in excess of  $350,000 or that is material to  Immunex's
business  or assets; (x)  any (a) incurrence of  indebtedness for borrowed money
other than as  provided for  in Immunex's  annual operating  plans (the  "Annual
Operating  Plans") provided to  AHP or its  affiliates from time  to time or (b)
capital expenditure by Immunex or any  of its subsidiaries that is greater  than
both (1) $350,000 and (2) the amount provided for such expenditure in the Annual
Operating  Plans; (xi) the institution by Immunex  or any of its subsidiaries of
any shareholder rights plan or similar plan or device; (xii) the acquisition  by
Immunex  or any of its subsidiaries of  technology or products under any license
or similar arrangement  if the  payments under all  such licenses  that are  not
contingent  upon sales of licensed technology  or products would exceed $500,000
during  any  year;  or  (xiii)  the  dissolution  of  Immunex  or  any  of   its
subsidiaries,  the adoption of a  plan of liquidation for  Immunex or any of its
subsidiaries or any action by Immunex or any of its subsidiaries to commence any
bankruptcy or similar proceeding.
 
    The approval of seven directors (or,  if the Board of Directors consists  of
more  than nine persons, that number of  directors representing 70% of the total
number of directors, rounded up to the nearest whole number), including, in  the
case  of clause (iv) below, two Independent  Directors, will be required for the
Board of Directors to approve  any of the following:  (i) the employment of  the
chief  executive officer,  chief operating  officer, chief  financial officer or
chief scientific  officer of  Immunex (each,  a "Senior  Officer"); (ii)  Annual
Operating  Plans  for  Immunex and  its  subsidiaries, which  shall  include all
material capital  expenditures and  borrowing plans  applicable to  the year  in
question;  (iii) Immunex's five-year product development and facility plans; and
(iv) amendment of the Governance  Agreement or provisions of Immunex's  Articles
of  Incorporation  or  Bylaws  implementing  the  provisions  of  the Governance
Agreement.
 
    The approval of six directors, which six directors must include each of  the
Independent Directors, will be required to approve and authorize the termination
of any Senior Officer.
 
    SUBSCRIPTION RIGHTS OF AMERICAN HOME PRODUCTS
 
    So  long as AHP has  the right to designate  at least one Investor Director,
prior to any issuance of securities by Immunex, AHP must be offered the right to
purchase a pro rata share of such  new securities. The foregoing right does  not
apply,  however, to  securities issued upon  exercise of  outstanding options or
warrants and to certain other issuances specified in the Governance Agreement.
 
    So long as AHP has  the right to designate  at least one Investor  Director,
AHP  has the  option to  purchase from Immunex  on a  quarterly basis additional
shares of Common Stock or other voting stock of Immunex to the extent  necessary
to  permit AHP  to maintain the  percentage of  shares of Common  Stock or other
voting stock of Immunex, as the case may be, owned by AHP and its affiliates  as
of the
 
                                       9
<PAGE>
immediately  preceding quarter. The  per share purchase price  of such shares of
Common Stock or other voting stock of Immunex, as the case may be, will be equal
to the fair market value of such shares on the date of AHP's purchase.
 
    STANDSTILL PROVISIONS
 
    AHP has agreed,  until June 1,  1998 (the "Standstill  Period"), subject  to
certain exceptions, not to directly or indirectly purchase or otherwise acquire,
or  propose or offer to purchase or  otherwise acquire, any equity securities of
Immunex, whether by tender offer, market purchase, private negotiated  purchase,
Business  Combination  (as defined  in  the Governance  Agreement  and described
below) or otherwise if,  immediately after such  purchase or acquisition,  AHP's
beneficial interest in Immunex would exceed 53.5% on a fully diluted basis.
 
    The prohibitions on AHP's acquisition of equity securities of Immunex do not
apply during any period in which AHP or any of its affiliates beneficially owns,
in  the aggregate, less than  5% of the then-outstanding  shares of Common Stock
(assuming exercise or conversion of any rights, options or warrants to  purchase
Common  Stock held by AHP and its  affiliates, but assuming no other exercise or
conversion of outstanding rights, options or warrants to purchase Common Stock).
In addition,  such  prohibitions  do  not  apply with  respect  to  any  of  the
following:  (i)  any  Permitted  Acquisition  Transaction  (as  defined  in  the
Governance Agreement and  described below)  that is  disclosed to  the Board  of
Directors promptly after the decision has been made to propose such transaction;
(ii)  any issuance of securities pursuant to AHP's subscription rights set forth
in the Governance Agreement; (iii) open-market  purchases made by AHP from  time
to time of equity securities of Immunex if (a) immediately after any such market
purchases,  AHP's beneficial  interest in Immunex  would not exceed  70% and (b)
AHP's intention  to make  such market  purchases is  disclosed to  the Board  of
Directors  and shareholders of  Immunex at least  two trading days  prior to any
such purchases and such purchases are  completed within 30 days of such  notice;
and  (iv) any cash tender  offer by AHP or any  affiliate of AHP if, immediately
after such tender offer, AHP's beneficial  interest in Immunex would not  exceed
70%.
 
    AHP has agreed that, during the Standstill Period, it will not, and will not
permit  its subsidiaries  to: (i) after  submitting a definitive  proposal for a
Permitted Acquisition Transaction  to the  Board of Directors,  make any  public
announcement  with respect to such transaction without the prior approval of the
Board of Directors, except as required by  law; (ii) make or participate in  any
"solicitation"  of "proxies" (as such  terms are used in  the proxy rules of the
Securities and  Exchange  Commission (the  "Commission"))  to vote  or  seek  to
advise,  encourage or influence any person or  entity with respect to the voting
of any shares of capital stock of Immunex; or (iii) deposit any shares of Common
Stock into  a  voting  trust or  subject  any  shares of  Common  Stock  to  any
arrangement  or agreement with respect to the voting of such securities or form,
join or in any  way participate in  any "group" (within  the meaning of  Section
13(d)(3) of the Exchange Act) with respect to any shares of Common Stock.
 
    A   "Permitted  Acquisition  Transaction,"  as  defined  in  the  Governance
Agreement, means either (i) a cash tender offer for all outstanding Common Stock
that is conditioned upon approval by at least a majority of the shareholders  of
Immunex  other than AHP and its  affiliates (the "Unaffiliated Shareholders") or
(ii) a Business  Combination that  is conditioned upon  approval by  at least  a
majority  of the Unaffiliated Shareholders, and that satisfies all the following
conditions: (a) the  Board of Directors  receives an opinion  from a  nationally
recognized  independent  investment  banking  firm  selected  by  the  Board  of
Directors (excluding the Investor Directors) that the price and other  financial
terms  of  the  transaction are  fair  from a  financial  point of  view  to the
Unaffiliated Shareholders; (b) the  Board of Directors,  in accordance with  the
Governance   Agreement,  concludes  that  the  price  and  other  terms  of  the
transaction  are  fair  to  and  in  the  best  interests  of  the  Unaffiliated
Shareholders and recommends that the Unaffiliated Shareholders accept the tender
offer  or otherwise  approve the  transaction; and  (c) neither  such investment
banking firm's opinion nor such recommendation of the
 
                                       10
<PAGE>
Board of Directors is withdrawn prior to the consummation of the transaction. In
addition, a merger  following the consummation  of a tender  offer described  in
clause  (i) of this paragraph that offers  the same consideration as such tender
offer is deemed to be a Permitted Acquisition Transaction.
 
    The term "Business  Combination," as  defined in  the Governance  Agreement,
means  any one of the following transactions: (i) any merger or consolidation of
Immunex or any subsidiary of Immunex with (a) AHP or (b) any corporation  (other
than  Immunex) which  is, or  after such  merger or  consolidation would  be, an
affiliate or associate of AHP; (ii) any  tender or exchange offer by AHP or  any
affiliate or associate of AHP for any equity securities of Immunex or any of its
subsidiaries;  (iii) any  sale, lease,  exchange, mortgage,  pledge, transfer or
other disposition by Immunex (in one transaction or a series of transactions) to
or with AHP or any  affiliate or associate of AHP  (other than Immunex) of  more
than  10%  of the  fair market  value of  the  total assets  of Immunex  and its
subsidiaries; (iv) the issuance,  exchange or transfer,  other than pursuant  to
AHP's  subscription rights under the Governance  Agreement, by Immunex or any of
its subsidiaries  (in  one transaction  or  a  series of  transactions)  of  any
securities  of Immunex  or any  subsidiary thereof  to AHP  or any  affiliate or
associate of AHP (other than Immunex) in exchange for cash, securities or  other
consideration  (or a combination thereof) having  an aggregate fair market value
equal to or in  excess of 10% of  the fair market value  of the total assets  of
Immunex  and its subsidiaries; (v) the adoption  of any plan or proposal for the
liquidation or dissolution of  Immunex proposed by  or on behalf  of AHP or  any
affiliate or associate of AHP (other than Immunex); or (vi) any reclassification
of  securities (including any reverse stock split), recapitalization of Immunex,
any merger or consolidation of Immunex with any subsidiary thereof, or any other
transaction to  which  Immunex is  a  party (whether  or  not with  or  into  or
otherwise  involving AHP  or any  affiliate or  associate of  AHP) that  has the
effect, directly or  indirectly, of  increasing the proportionate  share of  the
outstanding  shares of any class of  equity or convertible securities of Immunex
or any subsidiary thereof which  is directly or indirectly  owned by AHP or  any
affiliate or associate of AHP (other than Immunex).
 
    MATERIAL TRANSACTIONS WITH AMERICAN HOME PRODUCTS
 
    Immunex  may not enter into any  contract, agreement or transaction with AHP
or any of  its affiliates that  is material  to Immunex's business,  taken as  a
whole, unless two-thirds of the members of the Board of Directors, excluding the
Investor  Directors and  including at  least two  Independent Directors, approve
such contract, agreement or transaction.
 
    TRANSFER OF IMMUNEX COMMON STOCK BY AMERICAN HOME PRODUCTS
 
    AHP has agreed that, during the Standstill Period, it will not, and will not
permit any  entity  that is  directly  or indirectly  wholly  owned by  AHP  to,
transfer  any  shares  of Common  Stock,  except  (i) pursuant  to  a registered
underwritten  public  offering  in  accordance  with  the  registration   rights
provisions  of the Governance Agreement, (ii)  in accordance with the volume and
manner of sale limitations of Rule  144 promulgated under the Securities Act  of
1933, as amended (the "Securities Act"), or (iii) to any wholly owned subsidiary
of  AHP. During the Standstill Period, AHP  may not transfer any interest in any
Common Stock to any purchaser or  group (within the meaning of Section  13(d)(3)
of  the Exchange Act) of  purchasers if, after giving  effect to such sale, such
purchaser or group  of purchasers would,  to AHP's knowledge,  own, or have  the
right  to acquire, 5%  or more of  the then-outstanding shares  of Common Stock.
Other than  through a  block trade  in an  underwritten offering,  AHP may  not,
directly  or through any of its subsidiaries, transfer any interest in shares of
Common Stock in excess of  1% per day of  the then-outstanding shares of  Common
Stock.
 
    Notwithstanding  the foregoing  paragraph, after June  1, 1996,  AHP and its
wholly owned subsidiaries may transfer (an "Acquisition Sale") all (but not less
than all) the shares  of Common Stock  beneficially owned by  them to any  other
person  other than  an affiliate  of AHP,  provided that  such other  person has
offered to acquire all outstanding shares of Common Stock on the same terms  and
conditions as such Acquisition Sale. In addition, if AHP intends to engage in an
Acquisition  Sale it is required to notify Immunex of such intent and, for three
months subsequent to such notice, Immunex  will have the opportunity to  present
to   AHP  a  potential  buyer  willing  to  purchase  all  (but  not  less  than
 
                                       11
<PAGE>
all)  the shares of Common Stock beneficially  owned by AHP and its wholly owned
subsidiaries. In the  event that  a potential buyer  is presented,  AHP may  not
consummate  an  Acquisition  Sale on  terms  less  favorable to  AHP  than those
proposed by such potential buyer.
 
    During the  Standstill  Period, AHP  may  not sell,  transfer  or  otherwise
dispose  of any of the capital stock of  any wholly owned subsidiary of AHP that
owns Common Stock, except to another wholly owned subsidiary of AHP.
 
    REGISTRATION RIGHTS
 
    The holders of at least 25% of the Registrable Securities (as defined in the
Governance Agreement) (the "Initiating Holders") may request that Immunex file a
registration statement under the Securities Act covering the registration of any
or all Registrable Securities held by such Initiating Holders. Immunex will  not
be  obligated  to  effect  more  than  two  such  registrations.  The Governance
Agreement, however, does not limit the number of registrations on Form S-3  that
may  be requested and obtained if Immunex  is eligible to use Form S-3, provided
that the estimated aggregate  offering price to the  public exceeds $25  million
and the other provisions of the Governance Agreement are satisfied.
 
    Subject  to certain conditions,  if Immunex proposes  to file a registration
statement under the Securities Act on any  form (other than on Form S-4 or  S-8)
that  also would  permit the  registration of  Registrable Securities,  and such
filing is to be on  behalf of Immunex or selling  holders of its securities  for
the  general registration of shares of Common  Stock for cash, Immunex must give
notice thereof to the holders of the registration rights and permit such holders
to include Registrable Securities in the registration.
 
    AHP's registration rights are subject to certain conditions set forth in the
Governance Agreement. In addition, the Governance Agreement sets forth  specific
procedures  relating to such registration rights and detailed obligations of the
parties with  respect  thereto. All  expenses  incident to  the  performance  by
Immunex  of its obligations with respect to  the registration of AHP's shares of
Common Stock will be borne by  Immunex, except that the Initiating Holders  will
pay  all expenses incident to the  second registration. In addition, the holders
of Registrable Securities  will bear  and pay the  underwriting commissions  and
discounts  applicable to securities offered for their account in connection with
any registrations, filings  and qualifications made  pursuant to the  Governance
Agreement,  as  well  as  related  counsel  fees.  Immunex  and  the  holders of
Registrable Securities  each have  agreed  to indemnify  the other,  in  certain
instances,  with  respect  to  liabilities  incurred  in  connection  with  such
registrations.
 
    GUARANTY PAYMENTS BY AMERICAN HOME PRODUCTS
 
    Until December 31, 1997, AHP has agreed to make certain payments to  Immunex
if  revenues from  products of the  Lederle Oncology Business  and certain other
products of Immunex do not achieve certain annual targets. The targets for  1995
through 1997 are listed below as "Target Revenue." Payments are required for any
calendar  year in which  Target Revenue exceeds the  "Actual Revenue," i.e., the
sum of Immunex's net sales of Cyanamid Oncology Products, New Oncology  Products
and  Additional  Products  plus  certain other  revenues  related  to Additional
Products (as such terms are described below).
 
    The payment for any year in which Target Revenue is not realized equals  (i)
the amount by which Target Revenue for the calendar year exceeded Actual Revenue
for such year (a "Revenue Shortfall") reduced by (ii) the total of the following
costs  for  such  year  ("Avoided  Costs"):  (a)  variable  manufacturing  costs
(including packaging and  similar costs); (b)  variable distribution costs;  (c)
commissions;  (d) royalties and similar fees paid  to third parties; and (e) all
costs for  advertising, promotion,  marketing, distribution  or selling  of  any
Product (as described below) that were contemplated in the Annual Operating Plan
for  such year and that were not incurred because any approval required for such
Product or  any new  label indication  therefor  was not  received by  the  date
contemplated  by  such  Annual Operating  Plan  ("Avoided  Introductory Costs").
Notwithstanding the foregoing, the Revenue
 
                                       12
<PAGE>
Shortfall may not exceed the difference between the Target Revenue and the  Base
Revenue  set forth below and AHP's payment obligation may not exceed the amounts
set forth below  as "AHP's  Maximum Obligation." Immunex  recorded a  receivable
from AHP of $45,288,000 for the Revenue Shortfall for 1995. AHP paid this amount
on March 7 1996.
 
<TABLE>
<CAPTION>
                                                           1996    1997
                                                          ------  ------
                                                          (IN MILLIONS)
        <S>                                               <C>     <C>
        Target Revenue..................................  $190.5  $216.5
        Base Revenue....................................   103.0   122.7
        Maximum Revenue Shortfall.......................    87.5    93.8
        AHP's Maximum Obligation........................    56.0    60.0
</TABLE>
 
    For purposes of calculating AHP's payment obligations, Avoided Costs may not
exceed  15% of any Revenue Shortfall in 1995 and 20% of any Revenue Shortfall in
each of 1996 and 1997; provided, however, that in the event total Avoided  Costs
exceed  such ceilings,  AHP may reduce  its Revenue Shortfall  obligation by the
amount of  such excess  that  constitutes Avoided  Introductory Costs.  AHP  may
reduce  its Revenue Shortfall obligation for 1997  by any amount by which Actual
Revenue exceeded Target Revenue in any prior calendar year.
 
    Subject to  certain  conditions, AHP  may  discharge its  Revenue  Shortfall
obligation  otherwise than  by payment of  the applicable cash  amount under the
Governance Agreement  if such  alternative consideration  provides Immunex  with
equivalent value.
 
    The term "Cyanamid Oncology Products" is defined in the Governance Agreement
to  mean NOVANTRONE  mitoxantrone, methotrexate  injectable, leucovorin calcium,
thiotepa, AMICAR aminocaproic acid,  LEVOPROME methotrimeprazine and  Cyanamid's
generic  anticancer products that are the  subject of filings seeking regulatory
approval. The term "New  Oncology Products" means  all oncology products  useful
(to   the  extent  useful)  in  the  diagnosis  or  treatment  of  cancerous  or
precancerous, transitional  or  neoplastic  diseases  or  conditions  in  humans
resulting  from  research conducted  by AHP,  the  Company, or  research jointly
sponsored by AHP and the Company, or any such product with respect to which  AHP
or  the Company (except for any such product that is acquired solely through the
Company's own efforts)  is the licensee  or distributor (to  the extent of  such
license  or distribution rights) or is otherwise subsequently acquired by AHP or
the  Company,   including,  without   limitation:  (i)   cytotoxics   (including
photosensitizers)  and  cytokine modulators;  (ii) small  molecule hematopoietic
stimulators; (iii) cytokines and cytokine  receptors; (iv) MDR reversal  agents;
(v) anti-tumor monoclonal antibody conjugates; (vi) RAS pathway antagonists; and
(vii)  receptors  other  than  TNFR. New  Oncology  Products  will  exclude such
products to the extent that  the Company or AHP  cannot grant license rights  to
the other due to preexisting agreements entered into prior to December 15, 1992.
Should  either party,  however, have those  rights returned to  it, such product
will immediately  become a  New Oncology  Product. For  purposes of  determining
Actual  Revenues only, New Oncology Products will exclude any product of Immunex
that was  marketed,  clinically tested  or  in  preclinical testing  as  of  the
Effective  Time. The  term "Additional  Products" is  defined in  the Governance
Agreement to mean such  additional products designated (on  an annual basis)  by
AHP,  with the  concurrence of  the Board  of Directors,  that are  not Cyanamid
Oncology Products, New Oncology Products or Copromoted Products from which sales
or corporation  revenues are  to be  included in  Immunex's consolidated  income
statements  by reason  of the  fact that  the Annual  Operating Plan  of Immunex
forecasts a  Revenue Shortfall  in respect  of Cyanamid  Oncology Products,  New
Oncology Products and Copromoted Products. The term "Products" is defined in the
Governance  Agreement to mean, in the aggregate, Cyanamid Oncology Products, New
Oncology Products and Additional Products.
 
    TERMINATION
 
    The Governance Agreement will terminate at  the earlier of (i) such time  as
AHP  and its affiliates beneficially own 95% of all classes and series of Common
Stock and  (ii) such  time as  AHP and  its affiliates  no longer  own any  such
shares.
 
                                       13
<PAGE>
RESEARCH AND DEVELOPMENT AGREEMENT
 
    In  connection with the Merger, Cyanamid and Immunex entered into a Research
and Development  Agreement  (the  "Research and  Development  Agreement")  under
which,  among  other  things,  the  parties  collaborate  in  the  research  and
development and commercialization of New Oncology Products. Cyanamid and Immunex
formed a Collaboration Committee, which is responsible for planning, supervising
and coordinating  the collaborative  development  and commercialization  of  New
Oncology  Products.  During  the  years 1993  through  1997,  Immunex  agreed to
contribute certain  amounts  in  support of  Cyanamid's  oncology  research  and
development  programs, within  certain limits. During  1995, Immunex contributed
$15,800,000. Pursuant  to the  Research and  Development Agreement,  Immunex  is
forecasted  to pay  the amounts shown  below as Immunex  Contribution during the
years 1996 through 1997.  To the extent that  actual Cyanamid oncology  research
and  development expenses  for any year  exceed the Total  Oncology Research and
Development Budget Amount  forecasted to be  paid as shown  below, Immunex  will
also  pay 50% of such  excess, provided that any such  excess greater than 3% of
the Total  Oncology  Research  and  Development Budget  Amount  shown  below  is
approved by the Board of Directors.
 
<TABLE>
<CAPTION>
                                                            1996           1997
                                                            -----          -----
                                                               (IN MILLIONS)
        <S>                                                 <C>            <C>
        Total Oncology Research and Development Budget
         Amount...........................................  $69.6          $76.6
        Immunex Contribution..............................   26.1           38.3
</TABLE>
 
    The Research and Development Agreement provides that Immunex will contribute
50%  of the funding budgeted for  Cyanamid's oncology discovery research program
after 1997. Immunex and  AHP each will bear  development costs relating to  each
New  Oncology Product to the  extent such costs relate  to approval to sell such
product in the United States, its territories and possessions and Canada, in the
case of Immunex  (the "Immunex  Territory"), or in  all other  countries of  the
world, in the case of Cyanamid (the "Cyanamid Territory").
 
    Cyanamid  granted  to Immunex  a  royalty-free exclusive  license  under all
patents and technology owned or controlled by Cyanamid relating to New  Oncology
Products  to make,  have made,  use and  sell all  New Oncology  Products in the
Immunex Territory, subject to Cyanamid's retained  right to make, have made  and
use  New Oncology Products  in the Immunex Territory.  In addition, Cyanamid and
Immunex each granted  to the  other a  royalty-free exclusive  license to  their
respective  portions of any jointly owned technology to make, have made, use and
sell such technology in the Cyanamid Territory or the Immunex Territory, as  the
case  may be.  Immunex and  Cyanamid agreed  to cooperate  in preparing, filing,
maintaining  and  defending  all  such  patents  and  in  protecting  all   such
technology,  in each case  relating to the  New Oncology Products.  In the event
that a New Oncology Product is to be manufactured by Cyanamid for Immunex or  by
Immunex  for  Cyanamid,  the  manufacturing  party  will  supply  the reasonable
clinical and commercial requirements of the other party for such product under a
supply agreement to  be entered into  by Immunex and  AHP, at a  cost that  will
reimburse  the  manufacturing party  for its  manufacturing and  (within certain
limits) process  development  costs (including  an  allocation for  general  and
administrative   costs)  allocable  to  such  product,  plus,  with  respect  to
commercial requirements, a  reasonable profit.  To the  extent Immunex  develops
products  or technology other  than New Oncology Products  and determines not to
market such products or technology itself,  Immunex will offer to AHP  exclusive
marketing  rights  to  any  such  products  or  technology  before  offering any
marketing rights to third parties.
 
    If AHP were to  own less than 50%  of the Common Stock,  AHP would have  the
right to terminate the Research and Development Agreement on 60 days' notice.
 
ONCOLOGY PRODUCT LICENSE AGREEMENT
 
    In connection with the Merger, Cyanamid and Immunex entered into an Oncology
Product License Agreement under which Immunex granted to Cyanamid and certain of
its subsidiaries an exclusive license under the patents and know-how acquired by
Immunex  to  make, have  made and  use Contributed  Lederle Products  other than
Distributed Products (the "Assigned Products"), thereby
 
                                       14
<PAGE>
permitting  Cyanamid  to  manufacture  the  Assigned  Products  in  the  Immunex
Territory  for  supply to  Immunex and  for  ultimate sale  by Cyanamid  and its
sublicensees in the Cyanamid Territory. AHP  pays to Immunex a royalty equal  to
5%  of the net sales by AHP of the Assigned Products manufactured in the Immunex
Territory and sold  in the Cyanamid  Territory. Immunex and  AHP have agreed  to
cooperate  in preparing, filing,  maintaining and defending  all patents, and in
protecting all  technology, relating  to Assigned  Products. Immunex  recognized
revenue under this agreement of $2,546,000 during 1995.
 
IMMUNEX NEW ONCOLOGY PRODUCT LICENSE AGREEMENT
 
    Cyanamid  and Immunex entered  into an Immunex  New Oncology Product License
Agreement under  which Immunex  granted to  Cyanamid a  co-exclusive license  to
make,  have made, use and  sell in the Cyanamid  Territory New Oncology Products
resulting from the  research and  development efforts of  Immunex ("Immunex  New
Oncology  Products"). AHP pays to Immunex a royalty equal to 5% of the net sales
of Immunex New Oncology Products in  the Cyanamid Territory by AHP. Immunex  and
AHP  cooperate in preparing, filing, maintaining  and defending all patents, and
in protecting all technology, in each case relating to the Immunex New  Oncology
Products  covered by the Immunex New  Oncology Product License Agreement. In the
event that an Immunex New Oncology Product is to be manufactured by Immunex  for
AHP  or by  AHP for Immunex,  the manufacturing  party has agreed  to supply the
reasonable clinical  and commercial  requirements of  the other  party for  such
product  under a supply  agreement to be entered  into by Immunex  and AHP, at a
price that  will reimburse  the manufacturing  party for  its manufacturing  and
process   development   costs   (including  an   allocation   for   general  and
administrative  costs)  allocable  to  such  product,  plus,  with  respect   to
commercial  requirements, a reasonable profit.  Immunex recognized revenue under
this agreement of $651,000 during 1995.
 
TRADEMARK LICENSE AGREEMENT
 
    Cyanamid  and  Immunex  entered  into  a  United  States  Trademark  License
Agreement  under which Cyanamid  granted to Immunex an  exclusive license in the
United States  to  use certain  trademarks  in connection  with  the  marketing,
distribution  and  sale  of  the  Cyanamid  Oncology  Products  in  the  Immunex
Territory. In consideration for the grant of such license, Immunex agreed to pay
AHP a royalty equal to 2% of the net sales by Immunex of products in the Immunex
Territory that are sold using the trademarks. The royalties incurred by  Immunex
during 1995 totaled $267,000.
 
SUPPLY AGREEMENT, TOLL MANUFACTURING AGREEMENT AND METHOTREXATE DISTRIBUTORSHIP
AGREEMENT
 
    In  connection with the  Merger, Cyanamid and Immunex  entered into a Supply
Agreement, under  which  Cyanamid agreed  to  supply the  reasonable  commercial
requirements  of  Immunex, subject  to specific  maximum quantities,  for AMICAR
aminocaproic acid, oral formulations  of leucovorin calcium (currently  marketed
forms  only) and thiotepa  (currently marketed forms  only) at a  price equal to
125% of Cyanamid's  manufacturing costs (including  reasonable overhead  charges
and  certain other costs)  for such products.  In addition, Lederle Parenterals,
Inc.  ("LPI"),  a  subsidiary  of   Cyanamid  that  operates  a   pharmaceutical
manufacturing   facility  in   Carolina,  Puerto  Rico,   and  Immunex  Carolina
Corporation ("ICC"), a subsidiary  of Immunex that manufactured  pharmaceuticals
in  Puerto Rico in 1994, entered into a Toll Manufacturing Agreement under which
LPI toll converts raw materials provided by ICC into injectable formulations  of
NOVANTRONE  mitoxantrone,  leucovorin  calcium,  AMICAR  aminocaproic  acid  and
LEVOPROME methotrimeprazine at a price equal to 125% of LPI's costs relating  to
such  toll conversion. ICC was  dissolved in December 1994  and its rights under
the Supply Agreement were assigned to Immunex. LPI and Immunex also entered into
a Methotrexate Distributorship  Agreement whereby LPI  supplies methotrexate  to
Immunex  at  prices  that  are  adjusted  annually.  Immunex  and  ICC purchased
inventory at a cost of $9,536,000 from AHP and LPI under these agreements during
1995.
 
                                       15
<PAGE>
SERVICES AGREEMENT
 
    Cyanamid and Immunex entered  into a United  States Services Agreement  (the
"Services  Agreement") under which Cyanamid may provide certain medical support,
government sales, sales, education, pricing and contract administration,  market
research,  industry  affairs,  advertising  and  sales  promotion,  warehousing,
distribution, credit and  collections, legal and  merger transition services  to
Immunex.  As  Immunex progressively  assumes  responsibility for  such services,
Immunex will have  the right  to terminate  its obligations  under the  Services
Agreement, on a function-by-function basis, on 12 months' notice to AHP. Immunex
incurred  costs  totaling $968,000  under the  terms  of the  Services Agreement
during 1995.
 
DISTRIBUTORSHIP AGREEMENT FOR CANADA
 
    Cyanamid Canada,  Inc.  ("Cyanamid  Canada")  and  Immunex  entered  into  a
distributorship  agreement under which Immunex  appointed Cyanamid Canada as its
distributor in  Canada  for  certain  products. Immunex  agreed  to  supply  the
products  to Cyanamid  Canada at established  prices that are  subject to annual
adjustment. Immunex sold $1,631,000 of inventory to Cyanamid Canada during 1995.
 
LOAN AGREEMENT
 
    Immunex and Cyanamid Agricultural de Puerto Rico, Inc. ("CAPRI"), a Cyanamid
subsidiary, entered into  a Loan Agreement  in September 1993  (as amended,  the
"Loan  Agreement"). Pursuant to the Loan Agreement, CAPRI agreed to lend Immunex
up to the lesser  of $50 million  and 110% of the  amount receivable by  Immunex
from  AHP under the revenue guaranty for working capital purposes on a revolving
credit basis. Interest accrues on outstanding  balances at LIBOR plus 1% and  is
payable  on  maturity  of  individual  borrowings.  Unless  extended  by  mutual
agreement, the Loan  Agreement expires  on March 31,  1996. As  of December  31,
1994, Immunex had borrowed $34 million under the Loan Agreement. This amount was
repaid in March 1995, and no additional borrowings have been made.
 
TAXANE AGREEMENT
 
    In  1994, Cyanamid and Immunex entered  into a Taxane Agreement, pursuant to
which Immunex agreed to purchase bulk paclitaxel from Cyanamid that is  supplied
to  Cyanamid by Hauser Chemical  Research, Inc. The bulk  is being purchased for
use in developing  paclitaxel products for  marketing in the  United States  and
Canada.  Immunex also agreed to share with Cyanamid certain costs of formulation
development, clinical  studies,  and  research and  development  of  new  taxane
derivatives. In 1995, Immunex paid AHP $2,434,000 under the Taxane Agreement.
 
TACE AGREEMENT
 
    In  December 1995, Immunex  and AHP entered  into a License  Agreement and a
Research Collaboration,  Development and  License  Agreement relating  to  tumor
necrosis  factor  converting enzyme  ("TACE Agreements").  Pursuant to  the TACE
Agreements, Immunex  granted AHP  a worldwide  exclusive license  under  Immunex
intellectual  property relating to  TACE, and agreed to  collaborate with AHP in
developing TACE  inhibitors,  in consideration  of  certain fixed  payments  for
research  services,  and contingent  additional payments  that are  payable upon
achievement of  specified  research  and clinical  milestone  events.  In  1995,
Immunex recognized $2,000,000 in revenue under the TACE Agreements.
 
                                       16
<PAGE>
                               EXECUTIVE OFFICERS
 
    The  following individuals  are executive officers  of the  Company who will
serve in the capacities noted  until April 25, 1996,  or until the election  and
qualification  of their successors.  Each officer named below  is expected to be
reelected at the Company's Board  of Directors meeting to  be held on April  25,
1996.
 
<TABLE>
<CAPTION>
                                                                                   OFFICER
         NAME           AGE         POSITIONS AND OFFICES WITH THE COMPANY          SINCE
- ----------------------  ---   ---------------------------------------------------  -------
<S>                     <C>   <C>                                                  <C>
Edward V. Fritzky       45    Chief Executive Officer                               1994
Michael L. Kranda       42    President; Chief Operating Officer                    1988
Scott G. Hallquist      42    Senior Vice President; General Counsel; Secretary     1987
Peggy V. Phillips       42    Senior Vice President, Pharmaceutical Development     1995
Douglas G. Southern     53    Senior Vice President; Chief Financial Officer;       1991
                               Treasurer
Leonard R. Stevens      46    Senior Vice President, Strategic and New Product      1993
                               Planning
Douglas E. Williams     37    Senior Vice President, Discovery Research             1995
</TABLE>
 
    For  the  biographical  summaries  of Messrs.  Fritzky  and  Kranda  and Dr.
Williams, see "Election of Directors."
 
    Mr. Hallquist has been employed by the Company since June 1986, initially as
Director, Legal Affairs. He was elected to serve as Secretary in May 1987 and as
Vice President and General  Counsel in January 1989.  Mr. Hallquist was  elected
Senior  Vice President in October 1990, retaining the offices of General Counsel
and Secretary. Prior to joining the Company, he was employed by E.I. du Pont  de
Nemours  and Company as patent counsel. Mr.  Hallquist is a director of Qual-Med
Washington Health Plan, Inc., a  health maintenance organization and  subsidiary
of  Health Systems  International, Inc. Mr.  Hallquist received an  M.B.A. and a
J.D. from the University of North Carolina in 1981.
 
    Ms. Phillips joined the  Company in 1986, was  named Senior Vice  President,
Pharmaceutical  Development  in September  1994,  and was  elected  an executive
officer of the  Company in  February 1995. From  1991 until  its dissolution  in
January  1995,  Ms.  Phillips had  served  as  Senior Vice  President  and Chief
Operating Officer of IRDCO, the Company's wholly owned research and  development
corporation.  Ms. Phillips received an M.S.  in microbiology from the University
of Idaho.
 
    Mr. Southern has  been Senior  Vice President, Chief  Financial Officer  and
Treasurer  of the Company since January 1991.  Prior to joining the Company, Mr.
Southern was  employed  as  Senior  Vice  President,  Chief  Financial  Officer,
Treasurer and Secretary of Pay 'N Pak Stores, Inc. ("Pay 'N Pak"), a retail firm
headquartered  in Seattle, Washington. Mr. Southern  resigned from Pay 'N Pak in
June 1990. Pay  'N Pak  filed for  protection under  Chapter 11  of the  Federal
Bankruptcy Code on September 21, 1991.
 
    Mr.  Stevens  joined the  Company  in July  1993  as Senior  Vice President,
Strategic and New  Product Planning,  and was  elected an  executive officer  in
1994. Mr. Stevens had been employed by Lederle Laboratories since December 1989,
where  he served in several capacities,  including Director of Medical Education
and Programs,  Director  of  Professional Education  and  Director  of  Oncology
Marketing,  prior to  being appointed as  Vice President and  General Manager of
Oncology in June  1992. Mr. Stevens  received an M.B.A.  from the University  of
Pittsburgh in 1977.
 
                                       17
<PAGE>
                             EXECUTIVE COMPENSATION
 
COMPENSATION SUMMARY
 
    The  following table sets forth certain  information as to (i) the Company's
Chief  Executive  Officer  and  (ii)  the  Company's  four  other  most   highly
compensated  executive officers for services rendered  in all capacities for the
Company during the  fiscal years  ended December 31,  1993, 1994  and 1995  (the
"named executive officers").
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                             LONG-TERM
                                                                                            COMPENSATION
                                                                                               AWARDS
                                                           ANNUAL COMPENSATION              ------------
                                                -----------------------------------------      SHARES
                                                                           OTHER ANNUAL      UNDERLYING       ALL OTHER
NAME AND PRINCIPAL POSITION               YEAR  SALARY ($)   BONUS ($)   COMPENSATION ($)   OPTIONS (#)    COMPENSATION (1)
- ----------------------------------------  ----  ----------   ---------   ----------------   ------------   ----------------
<S>                                       <C>   <C>          <C>         <C>                <C>            <C>
Edward V. Fritzky.......................  1995    $375,000    $175,782        --                2,500          $ 19,245
  Chief Executive Officer                 1994    $306,674    $ 79,219       $154,882         125,000          $368,601
Michael L. Kranda.......................  1995    $301,752    $141,443        --               22,500          $ 19,843
  President; Chief Operating              1994    $288,768    $ 75,797        --                    0          $ 19,325
  Officer                                 1993    $275,016    $ 88,000        --               40,000          $ 13,866
Scott G. Hallquist......................  1995    $248,063    $116,280        --               22,500          $ 16,644
  Senior Vice President;                  1994    $236,250    $ 67,922        --                    0          $ 17,258
  General Counsel; Secretary              1993    $225,000    $101,250        --               40,000          $ 11,609
Douglas G. Southern.....................  1995    $190,095    $ 94,219        --               17,500          $ 10,222
  Senior Vice President; Chief            1994    $155,820    $ 44,798        --                    0          $  9,638
  Financial Officer; Treasurer            1993    $148,400    $ 43,778        --               30,000          $  3,550
Douglas E. Williams.....................  1995    $186,404    $ 93,750        --                6,000          $  7,646
  Senior Vice President,                  1994    $131,250    $ 34,500        --               10,000          $  5,729
  Discovery Research                      1993    $107,000    $ 26,216        --                9,000          $  4,606
</TABLE>
 
- ------------------------
(1) Consists  of matching  contributions to  a 401(k)  savings plan  of $18,169,
    $18,877, $15,799,  $9,563  and  $6,994, payment  of  excess  life  insurance
    premiums  of  $563, $453,  $374,  $301 and  $300,  and payment  of long-term
    disability premiums of $513, $513, $471, $358 and $352 for Messrs.  Fritzky,
    Kranda, Hallquist and Southern and Dr. Williams, respectively, in 1995.
 
                                       18
<PAGE>
    OPTION GRANTS
 
    The following table sets forth certain information regarding options granted
during  the fiscal year ended December 31, 1995 to the Company's Chief Executive
Officer and the other named executive officers.
 
                       OPTION GRANTS IN 1995 FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                                          POTENTIAL
                                                              INDIVIDUAL GRANTS                        REALIZABLE VALUE
                                          ---------------------------------------------------------   AT ASSUMED ANNUAL
                                           NUMBER OF     PERCENT OF                                     RATES OF STOCK
                                            SHARES      TOTAL OPTIONS                                 PRICE APPRECIATION
                                          UNDERLYING     GRANTED TO                                   FOR OPTION TERM(3)
                                            OPTIONS     EMPLOYEES IN    EXERCISE PRICE   EXPIRATION   ------------------
NAME                                      GRANTED (#)    FISCAL YEAR    ($/SHARE) (1)     DATE (2)       5%       10%
- ----------------------------------------  -----------   -------------   --------------   ----------   --------  --------
<S>                                       <C>           <C>             <C>              <C>          <C>       <C>
Edward V. Fritzky.......................     2,500            1%            $15.00        2/02/05     $ 23,584  $ 59,765
Michael L. Kranda.......................     2,500            5%            $15.00        2/02/05     $ 23,584  $ 59,765
                                            20,000                          $15.00        2/02/05     $188,668  $478,123
Scott G. Hallquist......................     2,500            5%            $15.00        2/02/05     $ 23,584  $ 59,765
                                            20,000                          $15.00        2/02/05     $188,668  $478,123
Douglas G. Southern.....................     2,500            4%            $15.00        2/02/05     $ 23,584  $ 59,765
                                            15,000                          $15.00        2/02/05     $141,501  $358,592
Douglas E. Williams.....................     1,500            1%            $15.00        2/02/05     $ 14,150  $ 35,859
                                             4,500                          $15.00        2/02/05     $ 42,450  $107,578
</TABLE>
 
- ------------------------
(1) The exercise price of the options is  equal to the fair market value of  the
    underlying Common Stock on the date of grant.
 
(2) Each of Messrs. Kranda, Hallquist and Southern and Dr. Williams received two
    grants  of employee stock options  on February 2, 1995.  The first grant was
    made pursuant to  the Company's  long-term incentive  compensation plan  and
    represents  the  smaller of  the two  grants indicated  in the  table. These
    options vest on a five-year schedule, becoming fully exercisable on February
    2, 2000, provided the holder remains employed by the Company. The second and
    larger grant indicated in the table for each of the foregoing named officers
    represents Retention Options, which vest on a three-year schedule,  becoming
    fully  exercisable on February 2, 1998, provided the holder remains employed
    by the Company.
 
(3) Future value of current year grants assuming appreciation of 5% and 10%  per
    year  over  the 10-year  option  period. The  actual  value realized  may be
    greater or less than the potential realizable values set forth in the table.
 
    OPTION EXERCISES AND YEAR-END VALUES
 
    The following table sets forth certain  information as of December 31,  1995
regarding  options held by  the Company's Chief Executive  Officer and the other
named executive officers. None of such officers exercised any options during the
fiscal year ended December 31, 1995.
 
                         FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                             NUMBER OF SECURITIES
                                            UNDERLYING UNEXERCISED         VALUE OF UNEXERCISED
                                               OPTIONS AT FISCAL         IN-THE- MONEY OPTIONS AT
                                                 YEAR-END (#)              FISCAL YEAR-END ($)
                                          ---------------------------   --------------------------
NAME                                      EXERCISABLE   UNEXERCISABLE   EXERCISABLE  UNEXERCISABLE
- ----------------------------------------  -----------   -------------   ----------   -------------
<S>                                       <C>           <C>             <C>          <C>
Edward V. Fritzky.......................    25,000         102,500       $27,500       $113,750
Michael L. Kranda.......................    16,000          46,500             0       $ 33,750
Scott G. Hallquist......................    16,000          46,500             0       $ 33,750
Douglas G. Southern.....................    12,000          35,500             0       $ 26,250
Douglas E. Williams.....................     5,600          19,400       $ 5,500       $ 31,000
</TABLE>
 
                                       19
<PAGE>
    EMPLOYMENT AGREEMENTS
 
    In November 1995, Immunex entered  into new Employment Agreements with  each
of  Messrs. Fritzky, Kranda,  Hallquist, Southern and  Stevens, Ms. Phillips and
Dr. Williams. These agreements,  which were approved by  the Board of  Directors
following  the November 2, 1995 offer by AHP to acquire all of the shares of the
Company not  owned by  it, are  intended to  motivate and  retain the  Company's
officers  during and after any transaction involving  a change of control of the
Company. The Employment Agreements with  Messrs. Fritzky, Hallquist and  Kranda,
which replaced existing agreements, are effective for a term of three years. The
agreements  with the other  officers become effective only  if an acquisition of
Immunex by AHP or a  third party is completed prior  to December 31, 1996.  Each
Employment  Agreement provides that the  executive's position, authority, duties
and responsibilities will be maintained at levels at least commensurate with the
levels enjoyed  by  the  employee  as  of  its  effective  date,  and  that  the
executive's salary, bonus and benefits will be continued through the term of the
agreement.  If  the employment  of the  executive is  terminated by  the Company
without Cause  or by  the executive  for Good  Reason (each  as defined  in  the
Employment Agreement), the executive will be entitled to receive his or her base
salary,  annual  incentive  bonus,  continued  participation  in  the  Company's
medical, dental and  insurance programs,  and certain other  benefits until  the
second  anniversary of the  date the executive's employment  with the Company is
terminated.
 
       REPORT ON EXECUTIVE COMPENSATION BY THE COMPENSATION COMMITTEE AND
                 THE STOCK OPTION PLAN ADMINISTRATION COMMITTEE
 
    The Company's compensation policy as  established by its Board of  Directors
is  intended  to  provide  competitive  compensation  to  all  employees, giving
consideration to the relative contribution  and performance of each employee  on
an  individual basis.  It is  the Company's  policy to  compensate its executive
officers at levels consistent with industry norms, primarily in the form of base
salary, together with incentive bonuses. In addition, it is the Company's policy
of granting stock options to each of its executive officers based on  individual
and  Company performance and in amounts consistent with industry norms, so as to
align their  interests with  shareholder value.  The biotechnology  industry  is
extremely  competitive with  respect to  recruitment and  retention of qualified
personnel; accordingly, the Company's management employs independently published
surveys of  biotechnology  industry  compensation  levels  to  ensure  that  the
Company's   compensation  practices   are  comparable   to  other  biotechnology
companies. This enables Immunex to attract and retain key employees.
 
    Determining the compensation levels of  the Company's executive officers  is
the   responsibility  of  the  Board  of  Directors,  through  its  Compensation
Committee, which  has  overall  responsibility for  the  Company's  compensation
policies  for  senior  management,  and  its  Stock  Option  Plan Administration
Committee, which is  responsible for  administering the  Company's stock  option
plans.  The  Compensation  Committee  makes  recommendations  to  the  Board  of
Directors as to the salaries of, and incentive bonuses awarded to, the Company's
Chief Executive  Officer and  other executive  officers. The  Stock Option  Plan
Administration  Committee determines the number and  terms of options granted to
the Company's Chief Executive  Officer, other executive  officers and all  other
employees.
 
    Executive  compensation  consists of  three  major components:  base salary,
annual incentive bonus and stock options.  Base salaries of the Chief  Executive
Officer  and  other executive  officers  are subjectively  determined,  based on
annual surveys of similar positions at other biotechnology companies  (described
below  as  the  Comparison  Group),  together  with  assessments  of  individual
performance and the Company's achievement of predetermined operating goals  that
are  established annually  by the  Board of  Directors (the  goals for  1995 are
described below). The Compensation Committee does not assign relative weights to
the factors  on  which  base  salaries  are  based.  Assessments  of  individual
performance include subjective evaluations of the value of individual executives
to the Company. The surveys employed include some, but not all, of the companies
included in the Nasdaq Pharmaceutical Index, which is one of the indices used in
the Company's performance graph that appears elsewhere in this Proxy Statement.
 
                                       20
<PAGE>
    The  Company's  Compensation Committee  meets in  December  of each  year to
determine the annual salary  component of executive compensation  to be paid  in
the following calendar year, and the amount of cash incentive bonus compensation
to  be awarded executives for performance in the current year. The salaries paid
to executives in 1995 were determined  by reference to 1994 compensation  survey
data,  adjusted  upwards for  inflation during  the term  between July  1994 and
December 1994.  The survey  data  considered by  the Compensation  Committee  in
determining  executive  salaries  included  salary  information  provided  by 47
biotechnology companies having more than 300 employees (the "Comparison Group"),
as well as a subgroup of the 18 largest biotechnology companies (the "Comparison
Subgroup"). The Compensation Committee believes each of the Comparison Group and
the Comparison Subgroup were representative of industry norms in late 1994,  and
each  are  weighted approximately  equally  by the  Compensation  Committee. The
Comparison Subgroup consisted  of Amgen,  Inc., Biogen,  Inc., Genentech,  Inc.,
Chiron  Corporation, Centocor, Inc., Genetics Institute, Genzyme Corporation and
Synergen Corporation,  and biotechnology  affiliates or  subsidiaries of  Baxter
Healthcare,  Bayer  AG, Berlex  Biosciences, Boehringer  Mannheim, Bristol-Myers
Squibb Company,  Hoffman-La  Roche,  Inc., American  Home  Products  Corporation
(Lederle  Praxis), Novo Nordisk, Scios Nova  and Syntex Corporation. In the case
of Mr. Fritzky, the Compensation Committee established a base salary for 1995 of
$375,000, which represented approximately 76% of average compensation for  chief
executive   officers  in  the  Comparison  Subgroup  and  101%  of  the  average
compensation  for  chief  executive  officers  in  the  Comparison  Group.   The
Compensation  Committee established 1995  base salaries for  the Company's other
executive officers ranging  from 81%  to 119%  of the  average compensation  for
executives  performing similar functions in companies included in the Comparison
Subgroup and 100% to 135% of the average compensation for executives  performing
similar functions in companies included in the Comparison Group.
 
    Under  the  Company's  compensation  plans,  annual  incentive  bonuses  are
calculated as a percentage of base salary  and are based in part on  achievement
of  corporate operating  goals and  in part  on individual  contributions toward
achieving such goals. The  Chief Executive Officer and  each of the other  named
executive  officers are eligible for  a team bonus of up  to 25% of base salary,
based on  the  achievement  of  corporate operating  goals,  and  an  additional
individual bonus of up to 12.5% of base salary based on individual contributions
toward  achievement of  corporate operating  goals and  subjective evaluation of
individual performance. Individual  bonuses in  excess of 12.5%  of base  salary
have  been awarded under circumstances  determined by the Compensation Committee
to merit special recognition. Corporate  operating goals are established at  the
beginning  of each year and  approved by the Board  of Directors. Achievement of
corporate operating goals provides the  Compensation Committee and the Board  of
Directors with a basis for the award of incentive bonuses.
 
    For  1995, the Board of Directors elected to award Mr. Fritzky and the other
named executive officers  a team  bonus of  125% of  the amount  for which  each
officer was eligible (i.e., 125% of 25% of base salary). The Board of Directors'
decision  took into account  that the Company had  met or substantially exceeded
all but  one of  its corporate  operating  goals. These  goals (which  were  not
assigned  relative weights and  are not listed in  order of relative importance)
were: (i) reduction of operating losses by 50%; (ii) generation of $1.5  million
in  revenue  through  contract  development  and  manufacturing  services; (iii)
approval of THIOPLEX-REGISTERED TRADEMARK- by  the Food and Drug  Administration
(the "FDA"); (iv) approval of a new indication in acute myelogenous leukemia for
LEUKINE-REGISTERED  TRADEMARK-; (v) approval of LEUKINE for use in patients with
chemotherapy-induced neutropenia ("CIN");  (vi) approval of  an abbreviated  new
drug application for etoposide by the FDA; (vii) completion of a PIXY321 pivotal
trial  accrual  goal;  (viii)  focus of  discovery  and  development  efforts in
scientifically  and  commercially  relevant   areas;  (ix)  development  of   an
integrated licensing strategy and implementation process; and (x) development of
a  systematic approach  to individual  and management  development. Although the
goal related to approval of LEUKINE  for CIN was not achieved, the  Compensation
Committee  took  into  account  that  the  delay  in  the  LEUKINE  approval was
attributable to a change in approval standards by the FDA's Biological  Response
Modifiers  Advisory Committee  that contravened a  prior FDA  agreement with the
Company. The  Compensation  Committee's  determination of  the  team  bonus  and
individual bonuses took into account that the Company exceeded by $5 million its
goal to reduce
 
                                       21
<PAGE>
operating  losses and exceeded by  $4.5 million its goal  to generate revenue by
contract  development  and  manufacturing  services.  It  also  considered   the
discovery  and licensing of products and technologies valued at over $50 million
in future revenues,  the Company's development  of promising Phase  II data  for
TNFR-Fc  and  the  Company's progress  with  respect  to three  products  in the
pre-development stage.
 
    The Board of Directors also elected to award Mr. Fritzky and the other named
executive officers individual  bonuses of up  to 125% of  12.5% of base  salary.
Thus,  each  of Mr.  Fritzky  and the  other  named executive  officers received
individual bonuses equal to  15.6% of their 1995  base salaries, in addition  to
the team bonuses discussed above.
 
    To  qualify compensation for deductibility  for federal income tax purposes,
it is the Company's policy to meet the requirements for exclusion from the limit
on deductions imposed by Section 162(m) of the Internal Revenue Code of 1986, as
amended (the "Code"), by paying performance-based compensation if possible. With
respect to  cases in  which it  is not  possible to  meet the  requirements  for
exclusion  from Section 162(m) of the Code,  the Company intends to minimize any
award of compensation in excess of the limit.
 
    Options to  purchase shares  of  Immunex stock  were  granted to  the  named
executive  officers, as  well as to  other employees, under  two programs during
1995. The first option grant was undertaken pursuant to the Company's  long-term
incentive  performance  award program,  initially  implemented in  1993, wherein
employees are  eligible to  receive  a grant  of  stock options  dependent  upon
individual  performance and position held. Under this program and in recognition
of his contribution  to the Company  in 1994,  Mr. Fritzky received  a grant  to
purchase  2,500 shares  of stock;  the other  named executive  officers received
grants of between 1,500 and 2,500 shares. No stock options with respect to  1995
have  been granted to officers or  other employees under the long-term incentive
performance award program.
 
    The second grant of stock options made  in 1995 was a special retention  and
incentive  grant  intended to  replace certain  stock  options granted  in 1993.
Following the  1993 merger  of  Lederle Oncology  Corporation and  the  Company,
Immunex  employees received grants  of stock options at  the then current market
price of the Company's Common Stock. Following these grants, the market price of
Immunex Common Stock declined substantially. As a result, the stock options held
by Immunex employees were exercisable  only at prices significantly higher  than
the   current  market  price  of  the  Company's  Common  Stock.  The  Company's
compensation consultant, Towers  Perrin, conducted  a comparative  study of  the
Company's compensation practices that indicated the 1993 options did not provide
adequate  incentives to retain valuable and experienced employees. In performing
this study,  Towers  Perrin  relied  on data  from  31  biotechnology  companies
participating  in their 1994 Biotechnology Long  Term Incentive Plan Survey. The
participating companies represented those companies in similar areas of research
and development which compete with Immunex  for the same type of personnel.  The
Company  has  experienced  increased  employee  turnover  in  1994  and  1995 as
experienced employees  have  been recruited  by  existing competitors  or  newly
formed biotechnology companies.
 
    Accordingly,  the Board of  Directors approved grants  of nonqualified stock
options ("Retention Options") to holders of options granted in 1993 at  exercise
prices  of $31.50 and $27.25 per share. The Retention Options were granted under
the Amended  1993  Stock Option  Plan  (the "1993  Plan")  and provide  for  the
purchase  at an exercise price  of $15.00 per share of  that number of shares of
Common Stock of  the Company equal  to 50% of  the options held  at an  exercise
price  of $31.50 and $27.25 per share.  Each Retention Option is governed by all
the terms and  conditions of  the 1993 Plan  except that  the Retention  Options
fully vest over a three-year period, rather than five years.
 
                                       22
<PAGE>
       COMPENSATION COMMITTEE
 
       Joseph J. Carr
       Kirby L. Cramer
       John E. Lyons
       Edith W. Martin
 
       STOCK OPTION PLAN ADMINISTRATION COMMITTEE
 
       Joseph J. Carr
       Kirby L. Cramer
       Robert A. Essner
       Richard L. Jackson
       John E. Lyons
       Edith W. Martin
 
                               PERFORMANCE GRAPH
                  COMPARISON OF FIVE-YEAR CUMULATIVE RETURN(1)
   AMONG THE COMPANY, NASDAQ COMPOSITE INDEX AND NASDAQ PHARMACEUTICAL INDEX
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
             IMMUNEX     NASDAQ COMPOSITE     NASDAQ PHARMACEUTICAL
<S>        <C>          <C>                  <C>
1990           100.00           100.00                 100.00
1991           165.73           160.56                 265.74
1992           143.36           186.87                 221.14
1993            81.71           214.51                 197.11
1994            74.80           209.69                 148.38
1995            82.97           296.30                 271.03
</TABLE>
 
- ------------------------
(1) Assumes  $100 invested at the  close of trading on  December 31, 1990 in the
    Common Stock, in the Nasdaq Composite Index and in the Nasdaq Pharmaceutical
    Index.
 
NOTE: Stock price performance shown above for the Common Stock is historical and
      not necessarily indicative of future price performance.
 
                                       23
<PAGE>
SECTION 16 REPORTING
 
    Section 16(a) of the Exchange Act requires the Company's officers, directors
and persons who own more than 10% of a registered class of the Company's  equity
securities  to  file reports  of  ownership and  changes  in ownership  with the
Commission. Officers, directors and greater  than 10% shareholders are  required
by Commission regulation to furnish the Company with copies of all Section 16(a)
forms they file.
 
    Based  solely on its review  of the copies of such  forms received by it, or
written representations  from  certain  reporting persons  that  no  forms  were
required  for those  persons, the Company  believes that during  1995 all filing
requirements  applicable  to  its  officers,  directors  and  greater  than  10%
beneficial owners were complied with by such persons.
 
                RELATIONSHIP WITH INDEPENDENT PUBLIC ACCOUNTANTS
 
    The  Board of  Directors has  selected Ernst  & Young  LLP, certified public
accountants, to act as  independent auditor of the  Company for the fiscal  year
ending  December 31,  1996. Ernst &  Young LLP  has been auditor  of the Company
since the Company's inception.
 
    A representative of  Ernst &  Young LLP  is expected  to be  present at  the
Annual  Meeting, with the opportunity to make a statement, if the representative
so desires, and is expected to be available to respond to appropriate  questions
from shareholders.
 
               DEADLINE FOR RECEIPT OF SHAREHOLDER PROPOSALS FOR
                              1997 ANNUAL MEETING
 
    Under  the Commission's proxy rules, shareholder proposals that meet certain
conditions may be  included in  the Company's Proxy  Statement and  Proxy for  a
particular  annual meeting.  Proposals of shareholders  that are  intended to be
presented by such  shareholders at  the Company's  1997 Annual  Meeting must  be
received  by the Company  no later than  November 23, 1996  to be considered for
inclusion in the  Proxy Statement and  form of Proxy  relating to that  meeting.
Receipt  by the Company of  any such proposal from  a qualified shareholder in a
timely manner will not guarantee its  inclusion in the Company's proxy  material
because there are other requirements in the proxy rules for such inclusion.
 
                                 OTHER MATTERS
 
    As  of the  date of this  Proxy Statement,  the Board of  Directors does not
intend to present, and has  not been informed that  any other person intends  to
present,  any matters for  action at the  Annual Meeting other  than the matters
specifically referred to in this Proxy Statement. If other matters properly come
before the Annual Meeting, it is intended  that the holders of the Proxies  will
act with respect thereto in accordance with their best judgment.
 
    Copies  of  the  1995 Annual  Report  of  the Company  are  being  mailed to
shareholders, together with this  Proxy Statement, form of  Proxy and Notice  of
Annual  Meeting  of Shareholders.  Additional copies  may  be obtained  from the
Secretary of the Company, 51 University Street, Seattle, Washington 98101.
 
    THE COMPANY'S ANNUAL REPORT ON FORM 10-K FOR THE FISCAL YEAR ENDED  DECEMBER
31,  1995, AS FILED WITH THE SECURITIES  AND EXCHANGE COMMISSION, IS INCLUDED IN
THE COMPANY'S 1995 ANNUAL REPORT TO SHAREHOLDERS.
 
                                          BY ORDER OF THE BOARD OF DIRECTORS
 
                                          Scott G. Hallquist
                                          SECRETARY
 
Seattle, Washington
March 26, 1996
 
                                       24
<PAGE>

                              IMMUNEX CORPORATION
           THIS PROXY IS SOLICITED BY THE BOARD OF DIRECTORS FOR THE
                ANNUAL MEETING OF SHAREHOLDERS--APRIL 25, 1996


    The undersigned hereby appoint(s) Edward V. Fritzky and Michael L. Kranda 
    and each of them as proxies, with full power of substitution, to 
P   represent and vote as designated all shares of Common Stock of Immunex 
R   Corporation held of record by the undersigned on March 13, 1996 at the 
O   Annual Meeting of Shareholders of the Company to be held at the Immunex 
X   Manufacturing and Development Center, 21511 23rd Drive Southeast, 
Y   Bothell, Washington, at 9:00 a.m. on Thursday, April 25, 1996, with 
    authority to vote upon the following matters and with discretionary 
    authority as to any other matters that may properly come before the 
    meeting or any adjournment or postponement thereof.


              IMPORTANT--PLEASE DATE AND SIGN ON THE OTHER SIDE.


                                                                See Reverse
                                                                   Side

<PAGE>

SHARES REPRESENTED BY THIS PROXY WILL BE VOTED AS DIRECTED BY THE SHAREHOLDER IN
THE SPACES PROVIDED. IF NO DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED "FOR ALL
                              NOMINEES" IN ITEM 1.

                            Please mark your votes as indicated in this example

                                                                          /X/

The Board of Directors recommends a vote "FOR all nominees"  in Item 1.

                                         FOR all          WITHHOLD AUTHORITY
                                         nominees      to vote for all nominees

1. Election of the nine nominees to        / /                  / /
   serve as directors for the ensuing
   year and until their successors are
   elected and qualify: Joseph J.
   Carr, Kirby L. Cramer, Robert A.
   Essner, Edward V. Fritzky, Richard
   L. Jackson, Michael L. Kranda,
   John E. Lyons, Edith W. Martin
   and Douglas E. Williams.

WITHHOLD for the following only* (Write the name of the nominee(s) in the space
below.)


____________________________________________________________________________

Unless otherwise directed, all votes will be apportioned equally among these 
persons for whom authority is given to vote.

Please send me an admittance ticket to the Annual Meeting.   / /

Please sign exactly as your name appears hereon. Attorneys, trustees, executors 
and other fiduciaries acting in a representative capacity should sign their 
names and give their titles. An authorized person should sign on behalf of 
corporations, partnerships, associations, etc. and give his or her title. If 
your shares are held by two or more persons, each person must sign. Receipt of 
the notice of meeting and proxy statement is hereby acknowledged.

Signature(s) ____________________________________   Date  ____________________

NOTE: Please sign as name appears hereon. Joint owners should each sign. When 
signing as attorney, trustee, executor or other fiduciary acting in a 
representative capacity, please give full title as such. 



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