IMCLONE SYSTEMS INC/DE
DEF 14A, 2000-04-25
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1

                            SCHEDULE 14A INFORMATION

          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                    EXCHANGE ACT OF 1934 (AMENDMENT NO.   )

Filed by the Registrant [X]

Filed by a Party other than the Registrant [ ]

Check the appropriate box:

<TABLE>
<S>                                            <C>
[ ]  Preliminary Proxy Statement
[ ]  Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
[X]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[ ]  Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
</TABLE>

                          ImClone Systems Incorporated
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X]  No fee Required.

[ ]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

     (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 (Set forth the amount on which the
          filing fee is calculated and state how it was determined):

        ------------------------------------------------------------------------

     (4)  Proposed maximum aggregate value of transaction:

        ------------------------------------------------------------------------

     (5)  Total fee paid:

        ------------------------------------------------------------------------

[ ]  Fee paid previously with preliminary materials.

[ ]  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>   2

                                 [IMCLONE LOGO]


                          IMCLONE SYSTEMS INCORPORATED

                               180 VARICK STREET
                               NEW YORK, NY 10014
                                 (212) 645-1405

                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

                         DATE:  MAY 31, 2000
                         TIME:  10:00 A.M. (LOCAL TIME)
                         PLACE: LE PARKER MERIDIEN HOTEL NEW YORK
                               118 WEST 57TH STREET
                               NEW YORK, NEW YORK 10019

ITEMS OF BUSINESS:

     1. Election of ten directors.

     2. Approval of amendments to the Company's 1996 Incentive Stock Option
        Plan, as amended (the "1996 ISO Plan") and the Company's 1996
        Non-Qualified Stock Option Plan, as amended (the "1996 Non-Qualified
        Plan") to increase the number of shares of common stock which are
        authorized to be issued in the aggregate under the 1996 ISO Plan and
        1996 Non-Qualified Plan.

     3. Approval of an amendment to the Company's certificate of incorporation
        to increase the number of shares of common stock the Company is
        authorized to issue.

     4. Approval of amendments to options held by the President and Chief
        Executive Officer and Executive Vice President and Chief Operating
        Officer.

     5. Ratification of the appointment of KPMG LLP as the Company's independent
        certified public accountants for the fiscal year ending December 31,
        2000.

     6. Any other matters properly brought before the shareholders at the
        meeting.

RECORD DATE:

     Only holders of the common stock of record at the close of business on
April 7, 2000 are entitled to notice of and to vote at the meeting.

ANNUAL REPORT:

     Our 1999 Annual Report, which is not a part of the proxy soliciting
material, is enclosed.

PROXY VOTING:

     It is important that your shares be represented and voted at the meeting.
To vote, please complete, sign and date the enclosed proxy and promptly return
it in the envelope provided. Sending in your proxy will not prevent you from
voting in person at the meeting.

                                          By Order of the Board of Directors

                                          /s/ John B. Landes

                                          JOHN B. LANDES
                                          Secretary

New York, New York

April 25, 2000

<PAGE>   3

                               TABLE OF CONTENTS


<TABLE>
<S>                                                           <C>
ABOUT THE MEETING...........................................    1
What is the purpose of the meeting?.........................    1
Who is entitled to vote?....................................    1
Who can attend the meeting?.................................    1
What constitutes a quorum?..................................    1
How do I vote?..............................................    2
Can I change my vote after I return my proxy card?..........    2
What are the Board's recommendations?.......................    2
What vote is required to approve each item?.................    2
How are votes counted?......................................    2
Who pays for this proxy solicitation?.......................    2
STOCK OWNERSHIP.............................................    3
Who are the largest owners of the Company's stock?..........    3
How much stock do the Company's directors and certain
  officers own?.............................................    3
ITEM 1 -- ELECTION OF BOARD OF DIRECTORS....................    5
Nominees for Director.......................................    5
Business Experience of Nominees for Director................    6
Directors' Compensation.....................................    8
Information Concerning Board and Committee Meetings.........    9
Information Concerning Officers.............................   10
Certain Transactions........................................   11
Executive Compensation......................................   12
Report of the Compensation Committee on Executive
  Compensation..............................................   12
Compensation Committee Interlocks and Insider
  Participation.............................................   13
Summary Compensation Table..................................   14
Option Grants in Fiscal 1999................................   16
Option and Warrant Exercises and Values for Fiscal 1999.....   17
Stock Price Performance.....................................   18
ITEM 2 -- Approval of amendments to the 1996 Incentive Stock
  Option Plan and 1996
Non-Qualified Stock Option Plan.............................   19
ITEM 3 -- Approval of amendment to the Certificate of
  Incorporation.............................................   23
ITEM 4 -- Approval of amendments to options held by the
  President and Chief Executive Officer And Executive Vice
  President and Chief Operating Officer.....................   25
ITEM 5 -- Ratification of the appointment of KPMG LLP for
  fiscal 2000...............................................   27
Stockholder Proposals for fiscal 2000.......................   27
</TABLE>


                                        i
<PAGE>   4


                          IMCLONE SYSTEMS INCORPORATED

                               180 VARICK STREET
                            NEW YORK, NEW YORK 10014
                            ------------------------


                                PROXY STATEMENT


                            ------------------------


     This proxy statement is furnished in connection with the solicitation of
proxies for use at the Annual Meeting of Stockholders of ImClone Systems
Incorporated (the "Company") to be held at 10:00 a.m., local time, on Wednesday,
May 31, 2000, at Le Parker Meridien Hotel, 118 West 57th Street, New York, New
York, New York 10019, and at any adjournments thereof. The Notice of Annual
Meeting, this proxy statement and the accompanying proxy card are first being
mailed to stockholders on or about April 28, 2000.


ABOUT THE MEETING

  What is the purpose of the meeting?

     At the meeting, stockholders will act upon the matters outlined in the
accompanying notice of meeting, including the election of Directors, approval of
amendments to the Company's 1996 Incentive Stock Option Plan, as amended (the
"1996 ISO Plan") and 1996 Non-Qualified Stock Option Plan, as amended (the "1996
Non-Qualified Plan" and, collectively with the 1996 ISO Plan, sometimes referred
to in this proxy statement as the "1996 Plans"), approval of an amendment to the
Company's certificate of incorporation, approval of amendments to options held
by the Company's President and Chief Executive Officer and Executive Vice
President and Chief Operating Officer and ratification of the Company's
independent auditors. In addition, the Company's management will report on the
performance of the Company during fiscal 1999 and respond to questions from
stockholders.

  Who is entitled to vote?

     Only stockholders of record at the close of business on the record date,
April 7, 2000, are entitled to receive notice of the meeting and to vote the
shares of common stock that they held on that date at the meeting, or any
postponement or adjournment of the meeting. Each outstanding share entitles its
holder to cast one vote on each matter to be voted upon.

  Who can attend the meeting?

     Although we encourage you to complete and return the proxy card to ensure
that your vote is counted, you can attend the annual meeting and vote your
shares in person. All stockholders as of the record date, or their duly
appointed proxies, may attend the meeting. Please note that if you hold your
shares in "street name" (that is, through a broker or other nominee), you will
need to bring a copy of a brokerage statement reflecting your stock ownership as
of the record date and check in at the registration desk at the meeting.

  What constitutes a quorum?

     The presence at the meeting, in person or by proxy, of the holders of a
majority of the shares of common stock outstanding on the record date will
constitute a quorum, permitting the meeting to conduct its business. As of the
record date, 31,228,232 shares of common stock of the Company were outstanding.
Proxies received but marked as abstentions and broker non-votes will be included
in the calculation of the number of shares considered to be present at the
meeting.

                                        1
<PAGE>   5

  How do I vote?

     If you complete and properly sign the accompanying proxy card and return it
to the Company, it will be voted as you direct. If you are a registered
stockholder and attend the meeting, you may deliver your completed proxy card in
person. "Street name" stockholders who wish to vote at the meeting will need to
obtain a proxy form from the institution that holds their shares.

  Can I change my vote after I return my proxy card?

     Yes. Even after you have submitted your proxy, you may change your vote at
any time before the proxy is exercised by filing with the Secretary of the
Company either a notice of revocation or a duly executed proxy bearing a later
date. The powers of the proxy holders will be suspended if you attend the
meeting in person and so request, although attendance at the meeting will not by
itself revoke a previously granted proxy.

  What are the Board's recommendations?

     The persons named as proxy holders on the proxy card will vote in
accordance with the recommendations of the Board of Directors (the "Board"). The
Board's recommendation is "for" each of the items set forth in this proxy
statement. With respect to any other matter that properly comes before the
meeting, the proxy holders will vote as recommended by the Board or, if no
recommendation is given, in their own discretion.

  What vote is required to approve each item?

     Election of Directors.  The affirmative vote of a plurality of the votes
cast at the meeting is required for the election of directors.

     Amendment of Certificate of Incorporation.  The affirmative vote of the
holders of a majority of the shares outstanding on the record date will be
required for approval. A properly executed proxy marked "ABSTAIN" with respect
to any such item will not be voted.

     Other Items.  For each other item, the affirmative vote of the holders of a
majority of the shares present in person or represented by proxy and entitled to
vote on the item will be required for approval. A properly executed proxy marked
"ABSTAIN" with respect to any such item will not be voted although it will be
counted for purposes of determining the number of votes cast on the item.
Accordingly, an abstention will have the effect of a negative vote. An
abstention will, however, be counted for purposes of determining whether there
is a quorum.

  How are votes counted?

     If you hold your shares in "street name" through a broker or other nominee,
your broker or nominee will be able to vote your shares without instruction from
you on matters that the New York Stock Exchange determines to be routine and
will not be permitted to vote your shares on matters that the New York Stock
Exchange does not determine to be routine. Thus, if you do not give your broker
or nominee specific instructions on non-routine matters, your shares may not be
voted on those matters and will not be counted in determining the number of
shares necessary for approval on those matters. Shares represented by such
"broker non-votes" will, however, be counted in determining whether there is a
quorum and in determining the number of votes cast on a routine item.

  Who pays for this proxy solicitation?

     We do. In addition to sending you these materials, some of our employees
may contact you by telephone, by mail, or in person. None of these employees
will receive any extra compensation for doing this. In addition, we have
retained Corporate Investor Communications, Inc. to assist us in soliciting your
proxy for a fee of $5,000 plus reasonable out-of-pocket expenses.

                                        2
<PAGE>   6

                                STOCK OWNERSHIP

WHO ARE THE LARGEST OWNERS OF THE COMPANY'S STOCK?

     The Company knows of no single person or group of related persons that is
the beneficial owner of more than 5% of the Company's common stock. This is
based solely on Schedule 13G and Schedule 13D reports filed with the Securities
and Exchange Commission ("SEC") as of March 28, 2000.

HOW MUCH STOCK DO THE COMPANY'S DIRECTORS AND CERTAIN OFFICERS OWN?

     The following table shows the amount of common stock of the Company
beneficially owned (unless otherwise indicated) by the Company's directors, the
Named Officers in the Summary Compensation Table below and the directors and
executive officers of the Company as a group. Except as otherwise indicated, all
information is as of March 28, 2000. "Beneficial Ownership" is a technical term
defined by the SEC to mean more than ownership in the usual sense. For example,
you "beneficially own" our common stock if you own it directly or indirectly
(e.g., through a relationship, a position as a director or trustee or through an
agreement).


<TABLE>
<CAPTION>
                                                                                    BENEFICIALLY
BENEFICIAL OWNER                                              BENEFICIALLY OWNED    OWNED(1)(2)
- ----------------                                              ------------------    ------------
<S>                                                           <C>                   <C>
Samuel D. Waksal, Ph.D. ....................................      1,592,583(3)           4.9%
Harlan W. Waksal, M.D. .....................................      1,240,780(4)           3.9%
Robert F. Goldhammer........................................        887,890(5)           2.8%
John Mendelsohn, M.D. ......................................        207,226(6)             *
Carl S. Goldfischer, M.D. ..................................        251,900(7)             *
David M. Kies...............................................        176,450(8)             *
Paul B. Kopperl.............................................         80,510(9)             *
Vincent T. DeVita, Jr., M.D. ...............................         86,592(10)            *
William R. Miller...........................................         53,647                *
Richard Barth...............................................         52,750(11)            *
Arnold J. Levine............................................         13,500(12)            *
Ronald A. Martell...........................................         15,731(13)            *
S. Joseph Tarnowski, Ph.D. .................................         15,054(14)            *
All directors and executive officers as a group (11
  persons)(15)..............................................      4,643,828             13.7%
</TABLE>


- ---------------
  *  Less than 1%.

 (1) Unless otherwise noted, each person's address is in care of ImClone Systems
     Incorporated, 180 Varick Street, Sixth Floor, New York, New York 10014.

 (2) The percentage of voting stock owned by each stockholder is calculated by
     dividing (1) the number of shares deemed to be beneficially held by such
     stockholder as of March 28, 2000, as determined in accordance with Rule
     13d-3 of the Securities Exchange Act of 1934, as amended (the "Exchange
     Act"), by (2) the sum of (A) 31,187,627, which is the number of shares of
     common stock outstanding as of March 28, 2000 plus (B) the number of shares
     of common stock issuable upon exercise of currently exercisable options and
     warrants held by such stockholder. For purposes of this security ownership
     table "currently exercisable options" and "currently exercisable warrants"
     consist of options and warrants exercisable as of March 28, 2000 or within
     60 days after March 28, 2000. Shares of our series A preferred stock are
     not included in the denominator because they do not have voting rights.

 (3) Includes 320,000 shares issuable upon the exercise of currently exercisable
     warrants and 655,000 shares issuable upon the exercise of currently
     exercisable options.

 (4) Includes 445,000 shares issuable upon the exercise of currently exercisable
     options; 278,220 shares issuable upon the exercise of currently exercisable
     warrants; and 2,600 shares owned by Dr. Waksal's sons.

                                        3
<PAGE>   7

 (5) Includes 146,042 shares issuable upon the exercise of currently exercisable
     options; 376,300 shares issuable upon the exercise of currently exercisable
     warrants; and 13,314 shares held in trust as to which Mr. Goldhammer
     disclaims beneficial ownership.

 (6) Consists of 207,226 shares issuable upon the exercise of currently
     exercisable options.

 (7) Includes 75,000 shares issuable upon exercise of currently exercisable
     options.

 (8) Includes 36,250 shares issuable upon the exercise of currently exercisable
     options and 8,200 shares held by Mr. Kies as custodian for his minor son.

 (9) Includes 60,000 shares issuable upon the exercise of currently exercisable
     options and 50 shares held by Mr. Kopperl's spouse as to which Mr. Kopperl
     disclaims beneficial ownership.

(10) Includes 86,292 shares issuable upon the exercise of currently exercisable
     options.

(11) Includes 51,250 shares issuable upon exercise of currently exercisable
     options.

(12) Consists of 13,500 shares issuable upon exercise of currently exercisable
     options.

(13) Includes 15,000 shares issuable upon exercise of currently exercisable
     options.

(14) Includes 15,000 shares issuable upon exercise of currently exercisable
     options.

(15) Includes an aggregate of (1) 2,750,080 shares issuable upon the exercise of
     currently exercisable options and warrants and (2) 13,364 shares as to
     which beneficial ownership is disclaimed. Notwithstanding that Mr. Martell
     and Dr. Tarnowski are included in the Summary Compensation Table included
     in this proxy statement, shares held by Mr. Martell and Dr. Tarnowski have
     not been included as they are not considered to be executive officers of
     ImClone.

                                        4
<PAGE>   8

                                 PROPOSAL NO. 1

                         ELECTION OF BOARD OF DIRECTORS


     An entire Board of Directors, consisting of ten members, will be elected at
the meeting. The directors elected will hold office until their successors are
elected, which should occur at the next annual meeting.


     Nominations.  At the meeting, the Board of Directors will nominate the
persons named in this proxy statement as directors. Although we don't know of
any reason why any of these nominees might not be able to serve, the Board of
Directors will propose a substitute nominee if any nominee is not available for
election.

     General Information About the Nominees.  All of the nominees are currently
directors of the Company. Each of the nominees has agreed to be named in the
proxy statement and to serve as a director if elected.

NOMINEES FOR DIRECTOR

<TABLE>
<CAPTION>
                                                                                          DIRECTOR OF
NAME                                              CURRENT POSITION WITH COMPANY          COMPANY SINCE
- ----                                              -----------------------------          -------------
<S>                                         <C>                                          <C>
Richard Barth(1)(2).......................  Director                                         1996
Vincent T. DeVita, Jr., M.D.(1)(5)........  Director                                         1992
Robert F. Goldhammer(2)(3)(4).............  Chairman of the Board                            1984
David M. Kies(2)(4).......................  Director                                         1996
Paul B. Kopperl(1)(2)(4)..................  Director                                         1993
Arnold J. Levine..........................  Director                                         2000
John Mendelsohn, M.D.(4)(5)...............  Director                                         1998
William R. Miller(1)(4)...................  Director                                         1996
Harlan W. Waksal, M.D.(3)(4)(5)...........  Executive Vice President, Chief Operating        1984
                                              Officer and Director
Samuel D. Waksal, Ph.D.(3)(5).............  President, Chief Executive Officer and           1985
                                            Director
</TABLE>

- ---------------
(1) Member of Audit Committee

(2) Member of Compensation and Stock Option Committee

(3) Member of Executive Committee

(4) Member of Nominating and Corporate Governance Committee

(5) Member of Research Oversight Committee

                                        5
<PAGE>   9

                  BUSINESS EXPERIENCE OF NOMINEES FOR DIRECTOR

     RICHARD BARTH, 68, has been a Director of the Company since October 1996.
Mr. Barth served as Chairman of the Board of Ciba-Geigy Corporation, United
States ("Ciba-Geigy") from 1990 until December 1996, and was President and Chief
Executive Officer of Ciba-Geigy from 1986 until April 1996. Mr. Barth is a
member of the Board of Directors of numerous organizations, including Novartis
Corporation, United States, The Bank of New York, Bowater, Inc. and New York
Medical College.

     VINCENT T. DEVITA, JR., M.D., 65, has been a Director of the Company since
February 1992. Since 1995, Dr. DeVita has served as Director of the Yale Cancer
Center as well as Professor of Medicine and Professor of Epidemiology and Public
Health at Yale University School of Medicine, New Haven, Connecticut. From
September 1988 through June 1995, Dr. DeVita served as Attending Physician at
Memorial Sloan Kettering Cancer Center ("Sloan Kettering"), New York, and
through June 1991 as Physician-in-Chief. From 1980 to 1988, he served under
Presidential appointment as Director of the National Cancer Institute ("NCI"),
where he had held various positions since 1966. During his years with the NCI,
Dr. DeVita was instrumental in developing the first successful combination
cancer chemotherapy program. This work ultimately led to effective regimens of
curative chemotherapy for a variety of cancers. Dr. DeVita's numerous awards
include the 1990 Armand Hammer Cancer Prize and the 1982 Albert and Mary Lasker
Medical Research Award for his contribution to the cure of Hodgkin's disease.
Dr. DeVita received his M.D. from the George Washington University School of
Medicine, Washington, DC, in 1961.

     ROBERT F. GOLDHAMMER, 69, has served as the Company's Chairman of the Board
since February 1991 and has been a Director of the Company since October 1984.
Mr. Goldhammer has been a partner of Concord International Investment Group,
L.P. since 1991. He was a partner of Rohammer Corporation, a private investment
company, from 1989 to 1991. He was a managing director of Kidder, Peabody Group
Inc., an investment banking firm, from May 1988 to January 1989. He is a
director of Esterline Technologies Corporation.

     DAVID M. KIES, 56, has been a Director of the Company since June 1996. Mr.
Kies is a Partner of the New York based law firm Sullivan & Cromwell,
specializing in mergers and acquisitions, securities and general corporate
matters.

     PAUL B. KOPPERL, 66, has served as a Director of the Company since December
1993. He is President of Pegasus Investments, Inc., Boston, a private investment
management firm established in 1994. He has served as President of Delano &
Kopperl, Inc., a private business strategy and venture investing firm in Boston
and its predecessor firms from 1976 to the present. From 1967 through 1975, he
was Vice President and a principal of Kidder, Peabody & Co. Incorporated, New
York, an investment banking firm. From 1959 to 1967 he was an associate with
Goldman, Sachs & Co., New York. Mr. Kopperl is a Trustee and Governor of the
Dana-Farber Cancer Institute, Boston and a member of its Executive and
Investment Committees. Over the years he has served as a trustee or director of
numerous businesses and not-for-profit educational, performing arts and social
welfare organizations.


     ARNOLD J. LEVINE, PH.D., 60, has served as a member of the Board since
April 2000. Dr. Levine is a cancer biologist and is President of Rockefeller
University. Previously, Dr. Levine was the Harry C. Wiess Professor of Life
Sciences at Princeton University, where he founded Princeton's molecular biology
department during a 12-year tenure that saw the department grow to include two
research laboratories and 35 faculty members. Prior to his work at Princeton,
Dr. Levine was Chairman at SUNY Stony Brook School of Medicine. Dr. Levine is
also a Director of PE Corporation, Baxter International, Inc., Genomica Corp.
and Advanced Medicine.


     JOHN MENDELSOHN, M.D., 63, has been a Director of the Company since
February 1998. He has served as the President of M.D. Anderson Cancer Center,
University of Texas, where he has also been Professor of Medicine since 1996.
From 1985 to 1996 he was Chairman of the Department of Medicine at Sloan
Kettering, New York, as well as holder of the Winthrop Rockefeller Chair in
Medical Oncology at Sloan Kettering. He was also Professor and Vice-Chairman of
Medicine at Cornell University Medical College and an attending physician at
both Memorial and New York Hospitals. Dr. Mendelsohn served on the faculty of
the University

                                        6
<PAGE>   10

of California, San Diego and was instrumental in the creation of the
University's Cancer Center, where he served as Director from 1976 to 1985. Dr.
Mendelsohn's work has focused on growth factors and their role in regulating the
proliferation of cancer cells through cell surface receptors. Dr. Mendelsohn was
responsible for developing specific monoclonal antibodies that block receptors,
including epidermal growth factor receptors, which mediate growth factor
activation of cell and growth and division. Dr. Mendelsohn is currently a board
member of Enron Corp., the Richard Lounsbery Foundation and the Greater Houston
Partnership, and a fellow of the New York Academy of Medicine. In 1997, Dr.
Mendelsohn was elected to the Institute of Medicine of the National Academy of
Sciences.

     WILLIAM R. MILLER, 71, has been a Director of the Company since June 1996.
Mr. Miller served as Vice Chairman of the Board of Directors of the
Bristol-Myers Squibb Company from 1985 until 1991, at which time he retired. Mr.
Miller is a director of Isis Pharmaceuticals, Inc., Transkaryotic Therapies,
Inc. and Westvaco Corporation. He is Chairman of the Board of Vion
Pharmaceuticals, Inc. He is Chairman of the Board of Trustees of the Cold Spring
Harbor Laboratory and is a past Chairman of the Board of the Pharmaceutical
Manufacturers Association. Mr. Miller is a Trustee of the Manhattan School of
Music, Metropolitan Opera Association and Opera Orchestra of New York. He is a
member of Oxford University Chancellor's Court of Benefactors, Honorary Fellow
of St. Edmund Hall and Chairman of the English-Speaking Union of the United
States.

     HARLAN W. WAKSAL, M.D., 47, is a founder of the Company and has been a
Director since April 1984. He has directed the Company's research and
development since April 1985, and has served as the Company's Executive Vice
President and Chief Operating Officer since March 1987. From 1985 to March 1987,
Dr. Waksal served as the Company's President. Dr. Waksal received his training
in Internal Medicine from Tufts-New England Medical Center Hospital and in
Pathology from Kings County Hospital in Brooklyn, New York from 1982 to 1987.
From 1984 to 1985, Dr. Waksal was Chief Resident in Pathology at Kings County
Hospital. He received his Medical Degree from Tufts University School of
Medicine in 1979. He is currently Adjunct Assistant Professor in the Department
of Pathology at Downstate Medical Center, New York. Dr. Harlan Waksal and Dr.
Samuel Waksal are brothers.

     SAMUEL D. WAKSAL, PH.D., 52, President of the Company, is a founder of the
Company and has been its Chief Executive Officer and a Director since August
1985 and President since March 1987. From 1982 to 1985, Dr. Waksal was a member
of the faculty of Mt. Sinai School of Medicine as Associate Professor of
Pathology and Director of the Division of Immunotherapy within the Department of
Pathology. He has served as visiting Investigator of the National Cancer
Institute, Immunology Branch, Research Associate of the Department of Genetics,
Stanford University Medical School, Assistant Professor of Pathology at Tufts
University School of Medicine and Senior Scientist for the Tufts Cancer Research
Center. Dr. Waksal was a scholar of the Leukemia Society of America from 1979 to
1984. Dr. Waksal currently serves on the Executive Committee of the New York
Biotechnology Association and is Chairman of the New York Council for the
Humanities. Dr. Samuel Waksal and Dr. Harlan Waksal are brothers.

     THE BOARD RECOMMENDS A VOTE "FOR" EACH OF THE NOMINEES NAMED ABOVE
(PROPOSAL NO. 1 ON YOUR PROXY CARD).

                                        7
<PAGE>   11

                            DIRECTORS' COMPENSATION

CASH COMPENSATION

     Each Director of the Company, exclusive of the Chairman, who is not a
full-time employee of the Company or who does not otherwise provide consulting
services to the Company receives compensation of $10,000 per year, or a pro rata
portion thereof for persons not serving the full fiscal year, for such person's
services as a Director as well as reimbursement of the Director's reasonable
out-of-pocket expenses incurred in connection with his Board and Board committee
activities. The Chairman, who is not a full-time employee of the Company,
receives $150,000 per year for his services as Chairman as well as reimbursement
of his reasonable out of pocket expenses incurred in connection with his Board
and Board committee activities. In addition, subject to the first sentence of
this paragraph, the Chairman of each of the Audit Committee, Compensation and
Stock Option Committee and Nominating and Corporate Governance Committee
receives $5,000 per year as compensation for the services of each as Chairman.

DIRECTORS' STOCK OPTIONS

     Pursuant to the Company's 1996 Non-Qualified Plan, Directors who are not
full-time employees of the Company automatically receive on each February 15th
an option to purchase a specified number of shares of common stock, or a pro
rata portion thereof for persons not having served the full fiscal year. On
February 15, 1999, this specified number was 2,500 shares; however, the amount
was increased to 15,000 shares at the annual meeting of shareholders for the
1998 fiscal year held in May 1999, except that for the Chairman who is not a
full time employee of the Company for whom this number was increased to 30,000
shares. Such options vest after one full year of service on the Board from the
date of grant and have an exercise price equal to the fair market value of the
common stock on the date of grant. Directors newly joining the Board who are not
full-time employees of the Company are made a one-time option grant under the
1996 Non-Qualified Plan to purchase 25,000 shares of common stock. Such options
vest as to 25% of the shares of common stock over the four-year period
commencing with the date of grant, subject to such individual's continued
service on the Board on the scheduled date of vesting, and have an exercise
price equal to the fair market value of the common stock on the date of grant.
From time to time, including during 1999, directors who are not full-time
employees of the Company are granted additional options in consideration for
providing services on the Board.

     The table below sets forth option grants to Directors who are not full-time
employees of the Company during the year ended December 31, 1999 in
consideration for such Directors serving on the Board:


<TABLE>
<CAPTION>
                                                            NUMBER OF
NAME                                                         OPTIONS
- ----                                                        ---------
<S>                                                         <C>
Richard Barth.............................................   2,500(1)
                                                            15,000(2)

Jean Carvais(3)...........................................   2,500(1)
                                                            15,000(2)

Vincent T. DeVita, Jr.....................................   2,500(1)
                                                            15,000(2)

Robert F. Goldhammer......................................   2,500(1)
                                                            30,000(4)

David M. Kies.............................................   2,500(1)
                                                            15,000(2)

Paul B. Kopperl...........................................   2,500(1)
                                                            15,000(2)

Arnold J. Levine..........................................       (5)
</TABLE>


                                        8
<PAGE>   12

<TABLE>
<CAPTION>
                                                            NUMBER OF
NAME                                                         OPTIONS
- ----                                                        ---------
<S>                                                         <C>
John Mendelsohn...........................................   2,500(1)
                                                            15,000(2)

William R. Miller.........................................   2,500(1)
                                                            15,000(2)
</TABLE>

- ---------------
(1) These options were granted automatically pursuant to the terms of the 1996
    Non-Qualified Plan on February 15, 1999 at a per share exercise price of
    $9.563 which is equal to the fair market value of the common stock on the
    date of grant. They vested and became exercisable in their entirety on
    February 15, 2000 and terminate February 14, 2009.

(2) These options were granted as additional options in consideration for
    serving on the Board pursuant to the terms of the 1996 Non-Qualified Plan on
    March 12, 1999 at a per share exercise price of $13.25 which is equal to the
    fair market value of the common stock on the date of grant. They vested and
    became exercisable in their entirety on March 12, 2000 and terminate March
    11, 2009.

(3) Dr. Carvais resigned from the Board effective March 13, 2000.

(4) Options to purchase an aggregate of 30,000 shares of common stock were
    granted as additional options in consideration for Mr. Goldhammer serving as
    Chairman of the Board pursuant to the terms of the 1996 Plans on March 12,
    1999 at a per share exercise price of $13.25 which is equal to the fair
    market value of the common stock on the date of grant. The options vested
    and became exercisable in their entirety on March 12, 2000 and terminate on
    March 11, 2009.

(5) Dr. Levine joined the Board in April 2000.

                   INFORMATION CONCERNING BOARD AND COMMITTEE
                      MEETINGS AND COMMITTEES OF THE BOARD

     The Board of Directors oversees the business and affairs of the Company and
monitors the performance of management. In accordance with corporate governance
principles, the Board does not involve itself in day-to-day operations. During
the year ended December 31, 1999, there were eight meetings of the Company's
Board. No incumbent director attended fewer than 75% of the total number of
meetings of the Board and of the Committees of the Board on which he served.

     The Company has an Executive Committee of the Board composed of Dr. Samuel
D. Waksal (Chairman), Robert F. Goldhammer and Dr. Harlan W. Waksal. The
Executive Committee acts for the Board when formal Board action is required
between Board meetings. The Executive Committee has all the power of the full
Board in the management of the business and affairs of the Company, except those
powers that by law cannot be delegated by the Board. The Executive Committee met
two times during the year ended December 31, 1999 and also took certain action
by unanimous written consent.

     The Company has an Audit Committee of the Board composed of Paul B. Kopperl
(Chairman), Vincent T. DeVita, Jr., Richard Barth and William R. Miller. The
Audit Committee considers matters relating to the adequacy and integrity of the
Company's internal financial controls and the objectivity of the Company's
financial reporting, reviews the Company's annual financial statements and the
performance of the Company's auditors and makes recommendations to the Board
with respect to these matters. The Audit Committee also provided leadership to
the Company's "Year 2000" compliance program. The Audit Committee's Chairman
reviews and comments upon the Company's quarterly financial statements. The
Audit Committee met three times during the year ended December 31, 1999.

     The Company has a Compensation and Stock Option Committee (the
"Compensation Committee") of the Board composed of Robert F. Goldhammer
(Chairman), Paul B. Kopperl, David M. Kies and Richard Barth. The Compensation
Committee is responsible for developing executive compensation policies. The
Compensation Committee (i) determines on an annual basis the base salary to be
paid to the Chief Executive Officer and determines bonuses and incentive awards
to be paid from time to time to the Chief Executive

                                        9
<PAGE>   13

Officer; and (ii) approves on an annual basis a salary plan for other senior
officers on the recommendation of the Chief Executive Officer in conjunction
with other senior personnel and approves bonuses and incentive awards to be paid
from time to time to such senior officers on the recommendation of the Chief
Executive Officer in conjunction with other senior personnel. The Compensation
Committee also administers the Company's various stock option and purchase
plans, including the granting of options under the option plans. The
Compensation Committee met two times during the year ended December 31, 1999 and
also took certain action by unanimous written consent.

     The Company has a Nominating and Corporate Governance Committee composed of
David M. Kies (Chairman), Paul B. Kopperl, John Mendelsohn, William R. Miller,
Robert F. Goldhammer and Harlan W. Waksal. The Nominating and Corporate
Governance Committee considers and makes recommendations to the Board regarding
Board and committee nominees and membership, director performance and officer
candidates. The Nominating and Corporate Governance Committee also considers and
makes recommendations to the Board with respect to corporate organizational and
governance matters. The Nominating and Corporate Governance Committee did not
meet during the year ended December 31, 1999. The Nominating and Corporate
Governance Committee considers nominations for director made by stockholders of
the Company in accordance with the procedures for submission of proposals at
annual or special meetings of stockholders set forth in the Company's Amended
and Restated By-laws.

     The Company has a Research Oversight Committee composed of Samuel D. Waksal
(Chairman), Vincent T. DeVita, Jr., John Mendelsohn and Harlan W. Waksal. The
Research Oversight Committee is responsible for participating on behalf of the
Board in the monitoring of the research focus of the Company. The Research
Oversight Committee did not meet during the year ended December 31, 1999.

                        INFORMATION CONCERNING OFFICERS

     Certain information concerning each officer of the Company is provided
below.

     SAMUEL D. WAKSAL, PH.D., is the President and Chief Executive Officer of
the Company. Certain information concerning Dr. Waksal appears on page 7.

     HARLAN W. WAKSAL, M.D., is the Executive Vice President and Chief Operating
Officer of the Company. Certain information concerning Dr. Waksal appears on
page 7.

     PETER BOHLEN, PH.D., 57, has been Vice President, Research of the Company
since September 1996. From November 1995 to July 1996 he was Senior Director of
Ixsys, a privately-held biotechnology company. From October 1987 to June 1996 he
was department head of the Molecular Biology Section of American Cyanamid's
Medical Research Division and director of the company's angiogenesis program. He
also has held academic positions at the Salk Institute, San Diego and the
University of Zurich, Switzerland. Dr. Bohlen received his Ph.D. in chemistry
from the University of Berne in Switzerland. In 1983, he received the Cloetta
Award in Switzerland for his contributions in the field of protein analysis.

     CARL S. GOLDFISCHER, M.D., 41, has served as Vice President, Finance and
Chief Financial Officer since May 1996. From June 1994 until joining the
Company, Dr. Goldfischer served as a healthcare analyst with Reliance Insurance
Company. From June 1991 until June 1994, Dr. Goldfischer was Director of
Research for D. Blech & Co., an investment banking firm. Dr. Goldfischer
received a doctorate of medicine from Albert Einstein College of Medicine in
1988 and served as a resident in radiation oncology at Montefiore Hospital of
the Albert Einstein College of Medicine until 1991. Dr. Goldfischer is a
Director of Immulogic Pharmaceutical Corporation and NeoRx Corporation.

     JOHN B. LANDES, 52, has served as Vice President, Legal and General Counsel
since 1992 and also as Vice President, Business Development from 1992 through
1999. Prior thereto, he was Vice President, Administration and Legal since
December 1984. He also has been Secretary of the Company since April 1985 and
served as its Treasurer from April 1984 through September 1991, except for an
interim period from December 1988 to February 1991. From 1978 to 1984, Mr.
Landes was an associate attorney with the Boston law firm of Mahoney, Hawkes and
Goldings.

                                       10
<PAGE>   14

     RONALD A. MARTELL, 38, has served as the Company's Vice President,
Marketing since November 1998. Prior to joining the Company he worked at
Genentech, Inc. for ten years where he held various positions. Most recently,
from 1996 until joining the Company, he served as Genentech's Group Manager of
Oncology Products where he directed the launch of Herceptin, Genentech's
monoclonal antibody product approved to treat breast cancer. From 1995 to 1996
he served as Senior Product Manager where he launched Pulmozyme for cystic
fibrosis in Europe. From 1994 through 1995 he served as Manager of Genentech's
Piedmont Sales Division. Prior to that, he served from 1993 as Associate Product
Manager for Genentech's Pulmozyme.

     S. JOSEPH TARNOWSKI, PH.D., 46, has served as the Company's Vice President,
Product and Process Development since January 1999. Prior to joining the
Company, he held various positions with CellPro Inc., the principal business of
which was the development, manufacture and marketing of automated systems that
utilize monoclonal antibodies to purify large quantities of specific cells for
therapeutic and diagnostic applications. He joined CellPro in June 1992 as Vice
President of Operations and was appointed to the position of Vice President of
Research and Development in June 1995 and became Senior Vice President and Chief
Technical Officer in December 1996. From November 1986 to May 1992, Dr.
Tarnowski was Director, Process and Product Development of Scios Nova Inc.
(formerly California Biotechnology Inc.), a company that develops recombinant
human proteins for therapeutic uses. Dr. Tarnowski received a Ph.D. in
Biochemistry from the University of Tennessee in 1979 and was a Postdoctoral
Fellow at the Roche Institute of Molecular Biology from 1979 through 1981.

     MICHAEL A. TRAPANI, 44, has served as ImClone's Vice President, Regulatory
Affairs & Quality Assurance since June 1999. He has more than 20 years'
experience in the pharmaceutical industry, with the majority of his experience
in the drug approval area. From January 1996 through May 1999, he held various
positions at Cytogen Corp., Princeton, New Jersey, most recently as its Vice
President, Regulatory Affairs & Quality Assurance. Prior to that, he served from
September 1993 until January 1996 as Senior Director, Regulatory Affairs for
Pharmacia Adria, Columbus, Ohio. From 1981 through 1993 he served in various
positions at Kabi Pharmacia, Piscataway, New Jersey, ending as its Executive
Director, Regulatory Affairs. Mr. Trapani began his career in 1977 with the Food
and Drug Administration.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Ownership of and transactions in the Company's securities by executive
officers and directors of the Company and owners of 10% or more of the Company's
outstanding common stock are required to be reported to the SEC pursuant to
Section 16(a) of the Exchange Act. During the year ended December 31, 1999,
based on information received by the Company, one form was untimely filed for
each of Mr. Kopperl, Dr. Goldfischer and Dr. Harlan Waksal.

                              CERTAIN TRANSACTIONS

     During the year ended December 31, 1999, the Company paid Dr. Vincent T.
DeVita, Jr., a Director of the Company, a total of $100,000 for scientific
consulting services provided to the Company by Dr. DeVita.

     In January 1998, the Company accepted a promissory note totaling
approximately $131,000 from its President and CEO in connection with the
exercise of a warrant to purchase 87,305 shares of the Company's common stock.
The note was due no later than two years from issuance and was full recourse.
Interest was payable on the first anniversary date of the promissory note and on
the stated maturity or any accelerated maturity at the annual rate of 8.5%. The
note, including all interest, has been paid in full.

     In October 1998, the Company accepted an unsecured promissory note totaling
$100,000 from its Executive Vice President and COO. The note was payable on
demand including interest at the annual rate of 8.25% for the period that the
loan was outstanding. The note, including all interest, has been paid in full.

     In January 1999, the Company accepted an unsecured promissory note totaling
$60,000 from its Vice President, Product and Process Development. The note was
payable upon the earlier of on demand or July 28, 1999 and bore interest at an
annual rate equal to the prime rate at Citibank, N.A. plus 1% for the period
that the loan was outstanding. The loan was made as a bridge in connection with
the officer's relocation in
                                       11
<PAGE>   15

connection with accepting employment with the Company. The note, including all
interest, has been paid in full.

     The Company uses Concord Capital Management International, a New York-based
money management firm, to manage the investment of a portion of the Company's
debt security portfolio. The Company's Chairman of the Board is a limited
partner of Concord Capital Management International. The Company paid investment
fees to Concord Capital Management International of approximately $60,000 in the
year ended December 31, 1999.

                             EXECUTIVE COMPENSATION

REPORT OF COMPENSATION COMMITTEE

  Overall Philosophy

     The Company's executive compensation philosophy is based on the premise
that compensation should be set at levels that support the Company's business
strategies and long-term objectives. The elements of the executive compensation
package are base salary and participation in annual incentives, including stock
options.

     In establishing base salaries, annual incentive awards and awards of stock
options, the Compensation Committee considers the executive's annual review and
periodic compensation surveys, including those provided by third parties
covering the biopharmaceutical industry.

     The Compensation Committee uses no set formulas and may accord different
weight to different factors for each executive. The Committee looks toward the
progress of the Company's research and development programs, its ability to gain
support for such programs, either internally or externally, its ability to
attract, motivate and retain talented employees and its ability to secure
capital sufficient for its product development to achieve rapid and effective
commercialization as may be practicable.

  Deductibility of Compensation

     The Compensation Committee has reviewed the impact of Section 162(m) of the
Internal Revenue Code of 1986, as amended (the "Code"), which, beginning in
1994, limits the deductibility of certain otherwise deductible compensation in
excess of $1 million paid to the Chief Executive Officer and the other Named
Officers (as hereinafter defined). It is the policy of the Company to attempt to
have its executive compensation plans treated as tax deductible compensation
whenever, in the judgment of the Compensation Committee, to do so would be
consistent with the objectives of that compensation plan.

  Chief Executive Officer Compensation

     In evaluating Dr. Samuel D. Waksal's 1999 performance, the following
Company achievements were noted:

     - At the end of 1998, the Company had financial assets of roughly
       $48,000,000 which increased to over $300,000,000 as of the date of this
       proxy statement, giving the Company financial resources to pursue its
       established strategic goals.

     - At the end of 1998, the Company had underway one Phase III clinical trial
       for its cancer vaccine, BEC2. At the end of 1999, the Company had
       initiated two additional Phase III clinical trials for IMC-C225, its lead
       interventional therapeutic, as a treatment for head and neck cancer.

     - During 1999, the Company initiated a pivotal Phase II clinical trial in
       colorectal cancer and another pivotal Phase II trial in head and neck
       cancer, each with IMC-C225.

     - During the year, the Company concluded pre-clinical work on IMC-1C11, its
       lead candidate for angiogenesis inhibition for which an IND was filed in
       December 1999 for the initiation of clinical trials.

                                       12
<PAGE>   16

     - The Company gave presentations at both the American Association of Cancer
       Researchers ("AACR") and American Society of Clinical Oncologists
       ("ASCO") meetings, which helped immeasurably its ability to achieve
       resulting financings, allowing the Company flexibility to assure its
       commitment to expanding ongoing clinic trials and product development.

     The market price of the Company's common stock has reflected the Company's
strategic and operational strengths under the leadership of both Dr. Samuel D.
Waksal and Dr. Harlan W. Waksal.

                                               Compensation and Stock Option
                                               Committee
                                               Robert F. Goldhammer, Chairman
                                               Richard Barth
                                               David M. Kies
                                               Paul B. Kopperl

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     As of December 31, 1999, the members of the Compensation Committee were
Richard Barth, Robert F. Goldhammer (Chairman), David M. Kies and Paul B.
Kopperl, none of whom is a full-time employee of the Company or any of its
subsidiaries or has ever been an officer of the Company or any subsidiaries.

                                       13
<PAGE>   17

                           SUMMARY COMPENSATION TABLE

     The Summary Compensation Table sets forth the cash and non-cash
compensation awarded to, earned by, or paid to the Company's Chief Executive
Officer and the four most highly compensated officers (other than the Chief
Executive Officer) for the years ended December 31, 1999, 1998 and 1997 who were
serving as officers at December 31, 1999 and whose total salary and bonus
exceeded $100,000 for the year ended December 31, 1999 (the "Named Officers").


<TABLE>
<CAPTION>
                                                                                              LONG TERM
                                                      ANNUAL COMPENSATION                COMPENSATION AWARDS
                                          -------------------------------------------   ---------------------
                                                                         OTHER ANNUAL   SECURITIES UNDERLYING    ALL OTHER
                                                  SALARY       BONUS     COMPENSATION   OPTIONS AND WARRANTS    COMPENSATION
                                          YEAR    ($)(1)       ($)(2)       ($)(3)             (#)(4)               ($)
                                          ----   --------     --------   ------------   ---------------------   ------------
<S>                                       <C>    <C>          <C>        <C>            <C>                     <C>
Samuel D. Waksal........................  1999   $300,000     $600,000          --            1,000,000           $10,435(6)
  President and Chief                     1998    300,000      400,000          --              300,000            10,435(6)
  Executive Officer                       1997    225,000      280,000          --              250,000(5)         10,435(6)
Harlan W. Waksal........................  1999    250,000      500,000          --              650,000                --
  Executive Vice President                1998    250,000      300,000          --              250,000                --
  and Chief Operating Officer             1997    195,000      250,000          --              497,000(5)(7)          --
Carl S. Goldfischer(8)..................  1999    175,000      250,000          --                  (9)                --
  Vice President, Finance                 1998    175,000       75,000          --              125,000(9)             --
  and Chief Financial Officer             1997    175,000       90,000          --               25,000(5)             --
Ronald A. Martell(10)...................  1999    175,000      100,000          --               75,000
  Vice President,                         1998     15,417(10)   25,000(11)   161,216(12)          60,000
  Marketing and Sales                     1997         --           --          --                   --
S. Joseph Tarnowski(13).................  1999    195,000       60,000          --               75,000                --
  Vice President, Product                 1998         --           --          --                   --                --
  and Process Development                 1997         --           --          --                   --                --
</TABLE>


- ---------------
 (1) Amounts shown include compensation deferred pursuant to Section 401(k) of
     the Code.

 (2) Although the Company has no formal bonus plan, the Compensation Committee,
     in its discretion, may award bonuses to officers of the Company. The
     Company has paid bonuses based on individual and Company performance.
     Amounts shown include awards paid relative to services rendered in each of
     the last three fiscal years. All bonus awards for each of the last three
     fiscal years were paid in cash. Bonuses are recorded for the period in
     which they were earned.

 (3) Excludes perquisites and other personal benefits for each Named Officer
     which did not equal or exceed the lesser of $50,000 or 10% of such
     individual's base salary and bonus for the years ended December 31, 1999,
     1998 and 1997, respectively.

 (4) Options or warrants to purchase the number of shares of common stock shown
     are recorded for the period in which they were granted, except as discussed
     in footnote 5.

 (5) Options to purchase 250,000, 100,000 and 25,000 shares of common stock,
     respectively, held by Drs. Samuel D. Waksal, Harlan W. Waksal and Carl S.
     Goldfischer, respectively, were granted in January 1998 and relate to 1997
     performance.

 (6) Consists of premium payments on a term life insurance policy for Dr. Samuel
     D. Waksal under which his daughters are the beneficiaries.

 (7) In March 1997, the Board extended the term of a warrant to purchase 397,000
     shares of common stock held by Dr. Harlan W. Waksal which was due to
     expire. The term was extended for a period of two years on the same terms
     and conditions as the original grant. For purposes of this table, this
     extension is treated as a new warrant grant. In April 1997, Dr. Harlan W.
     Waksal exercised this warrant.

 (8) Dr. Goldfischer commenced employment with the Company on May 20, 1996.

 (9) In May 1998, Dr. Goldfischer was granted an option to purchase 125,000
     shares of common stock. Pursuant to its original terms, it vested as to 40%
     on May 27, 1999 and was scheduled to vest as to 30% on May 27, 2000 and the
     remaining 30% on May 27, 2001. In March 2000, the vesting of this option
     was

                                       14
<PAGE>   18


accelerated so that it became immediately vested and exercisable in its
entirety. This benefit is deemed to relate to 1999 performance.


(10) Mr. Martell commenced employment with the Company in November 1998.

(11) This was a sign-on bonus paid to Mr. Martell upon his joining the Company.

(12) Consists of relocation expenses associated with Mr. Martell's joining the
     Company, including closing costs for sale of home, temporary housing and
     taxes associated with such benefits.

(13) Dr. Tarnowski commenced employment with the Company in January 1999.

                                       15
<PAGE>   19

                          OPTION GRANTS IN FISCAL 1999

     The following table sets forth certain information relating to stock option
grants to the Named Officers during the year ended December 31, 1999.


<TABLE>
<CAPTION>
                                          % OF TOTAL
                             NUMBER OF     OPTIONS/                                   POTENTIAL REALIZABLE VALUE AT
                             SECURITIES    WARRANTS                                      ASSUMED ANNUAL RATES OF
                             UNDERLYING   GRANTED TO                                  STOCK PRICE APPRECIATION FOR
                              OPTIONS/    EMPLOYEES      EXERCISE                        OPTION/WARRANT TERM(3)
                              WARRANTS    IN FISCAL       PRICE       EXPIRATION   -----------------------------------
           NAME               GRANTED      YEAR(1)     ($/SHARE)(2)      DATE       0%($)       5%($)        10%($)
           ----              ----------   ----------   ------------   ----------   -------   -----------   -----------
<S>                          <C>          <C>          <C>            <C>          <C>       <C>           <C>
Samuel D. Waksal...........  1,000,000(4)     31%        $ 18.25        5/23/09         --   $11,477,327   $29,085,800
Harlan W. Waksal...........    650,000(4)     20%          18.25        5/23/09         --     7,460,263    18,905,770
Carl S. Goldfischer........        (5)        --              --             --         --            --            --
Ronald A. Martell..........     75,000(6)      2%          28.00        11/1/09         --     1,320,679     3,346,859
S. Joseph Tarnowski........     60,000(7)      2%           8.44         1/3/09    $59,880       416,010       962,384
                                15,000(6)    0.5%         36.125       12/15/09                  340,782       863,609
</TABLE>


- ---------------
(1) The Company granted options to purchase a total of 3,275,260 shares of
    common stock to employees during 1999.

(2) Except as discussed in footnote 7, all options were granted to purchase
    common stock at an exercise price that equaled or exceeded the fair market
    value of the common stock on the date of grant.

(3) The amounts set forth in the three columns represent hypothetical gains that
    might be achieved by the holders if the respective options are exercised at
    the end of their terms. These gains are based on assumed rates of stock
    price appreciation of 0%, 5% and 10% compounded annually from the dates the
    respective options were granted.

(4) These options vest and become exercisable in their entirety on May 24, 2006;
    subject to earlier vesting based on stock price targets being achieved over
    a specified period of time. As of the date of this proxy statement, all
    stock price targets have been achieved and the stockholders are being asked
    to approve an amendment to these options that would make them fully
    exercisable upon approval by the shareholders at the Annual Meeting. See
    Proposal No. 4.


(5) In May 1998, Dr. Goldfischer was granted an option to purchase 125,000
    shares of common stock. Pursuant to its original terms, it vested as to 40%
    on May 27, 1999 and was scheduled to vest as to 30% on May 27, 2000 and the
    remaining 30% on May 27, 2001. In March 2000, the vesting of this option was
    accelerated so that it became immediately vested and exercisable in its
    entirety. This benefit is deemed to relate to 1999 performance.


(6) These options are exercisable as to 25% of the shares on each of the first,
    second, third and fourth anniversaries of the date of grant.

(7) This option was granted to Dr. Tarnowski in connection with his commencement
    of employment with the Company in January 1999. It was granted at an
    exercise price equal to the fair market value of the common stock on the
    date he accepted his offer of employment. It is exercisable as to 25% of the
    shares on each of the first, second, third and fourth year anniversaries of
    his commencement of employment.

                                       16
<PAGE>   20

            OPTION AND WARRANT EXERCISES AND VALUES FOR FISCAL 1999

     The following table sets forth option and warrant exercises during the year
ended December 31, 1999 by the Named Officers and the value of the options and
warrants held by such persons on December 31, 1999, whether or not exercisable
on such date.

<TABLE>
<CAPTION>
                                                                   NUMBER OF SHARES            VALUE OF UNEXERCISED
                                                                UNDERLYING UNEXERCISED             IN-THE-MONEY
                                                                  OPTIONS/WARRANTS AT            OPTIONS/WARRANTS
                                 SHARES                          DECEMBER 31, 1999(#)       AT DECEMBER 31, 1999($)(2)
                               ACQUIRED ON       VALUE        ---------------------------   ---------------------------
NAME                           EXERCISE(#)   REALIZED($)(1)   EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
- ----                           -----------   --------------   -----------   -------------   -----------   -------------
<S>                            <C>           <C>              <C>           <C>             <C>           <C>
Samuel D. Waksal.............         --       $       --       765,000       1,180,000(3)  $25,018,000    $26,460,000(3)
Harlan W. Waksal.............         --               --       520,680         800,000(3)   18,034,278     18,131,250(3)
Carl S. Goldfischer..........    300,000        3,507,492        75,000              --       2,118,750             --
Ronald A. Martell............         --               --        15,000         120,000         442,500      2,199,375
S. Joseph Tarnowski..........         --               --            --          75,000              --      1,923,600
</TABLE>

- ---------------
(1) The values realized were calculated by multiplying the closing market price
    of the common stock on the date of exercise by the respective number of
    shares exercised and subtracting the aggregate exercise price. Accordingly,
    such values realized assume a sale of such common stock on the date of
    exercise, which may not necessarily have occurred.

(2) The values were calculated by multiplying the closing market price of the
    common stock on December 31, 1999 ($39.625 per share as reported by the
    Nasdaq National Market on that date) by the respective number of shares and
    subtracting the aggregate exercise price, without making any adjustments for
    vesting, termination contingencies or other variables. If the exercise price
    of an option or warrant is equal to or greater than $39.625 the option or
    warrant is deemed to have no value.

(3) This does not give effect to an approval of Proposal No. 4.

OTHER BENEFIT PLANS

     The Company has no defined benefit or defined contribution retirement plans
other than the ImClone Systems Incorporated 401(k) Employee Savings Plan (the
"Plan") established under Section 401(k) of the Code. Contributions to the Plan
are voluntary, and substantially all full-time employees are eligible to
participate. For 2000, the Company has elected to make voluntary matching
contributions equal to 25% of the first 4% of an employee's eligible
compensation contributed by the employee, limited to $2,500 per employee. The
Company made such a matching contribution for 1999 which totaled $70,000. The
Company anticipates evaluating the level of its matching contribution, if any,
on an annual basis.

                                       17
<PAGE>   21

                            STOCK PRICE PERFORMANCE


     The graph below provides a comparison of the cumulative total return
(assuming reinvestment of dividends) for the Company (which paid no dividends),
The Nasdaq Stock Market (U.S. Companies) Total Return Index, the Nasdaq
Pharmaceutical Stocks Total Return Index and The American Stock Exchange
Biotechnology Total Return Index for the period from December 31, 1994 through
December 31, 1999. The graph assumes $100 was invested in ImClone common stock
and each of the indexes at the beginning of such period. The Nasdaq Stock Market
(U.S. Companies) Total Return Index comprises all domestic common shares traded
on the Nasdaq National Market and the Nasdaq SmallCap Market. The Nasdaq
Pharmaceutical Stocks Total Return Index represents all companies, including
biotechnology companies, trading on Nasdaq classified under the Standard
Industrial Classification Code for pharmaceuticals. The American Stock Exchange
Biotechnology Total Return Index represents a cross section of companies in the
biotechnology industry trading on the American Stock Exchange. The Company has
included the American Stock Exchange Biotechnology Total Return Index because
the Company believes it is a more relevant comparison due to its being comprised
solely of biotechnology companies.



        COMPARISON OF FIVE YEAR TOTAL RETURN AMONG IMCLONE, NASDAQ STOCK


 MARKET (U.S. COMPANIES) TOTAL RETURN INDEX, NASDAQ PHARMACEUTICAL STOCKS TOTAL
             RETURN INDEX AND AMEX BIOTECHNOLOGY TOTAL RETURN INDEX

LINE GRAPH

<TABLE>
<CAPTION>
                                                                                             NASDAQ
                                          IMCLONE SYSTEMS       NASDAQ U.S. STOCKS       PHARMACEUTICAL       AMEX BIOTECHNOLOGY
                                          ---------------       ------------------       --------------       ------------------
<S>                                     <C>                    <C>                    <C>                    <C>
12/31/94                                       100.00                 100.00                 100.00                 100.00
12/31/95                                       814.00                 141.00                 183.00                 163.00
12/31/96                                      1041.00                 174.00                 184.00                 176.00
12/31/97                                       867.00                 213.00                 190.00                 198.00
12/31/98                                       967.00                 300.00                 242.00                 226.00
12/31/99                                      4229.00                 546.00                 450.00                 477.00
</TABLE>

                                       18
<PAGE>   22

                                 PROPOSAL NO. 2

  APPROVAL OF AMENDMENTS TO THE COMPANY'S 1996 INCENTIVE STOCK OPTION PLAN AND
  1996 NON-QUALIFIED STOCK OPTION PLAN TO INCREASE THE SHARES OF COMMON STOCK
                    AUTHORIZED TO BE ISSUED UNDER THE PLANS


     The shareholders are being asked to increase the number of shares of common
stock authorized to be issued in the aggregate under the 1996 Plans from
4,000,000 shares to 5,500,000 shares.


     Each of the 1996 Plans has been approved by the Board and the stockholders
of the Company for the benefit of certain executives and employees of the
Company, in the case of the 1996 ISO Plan, and consultants, advisors, directors
and employees of the Company, in the case of the 1996 Non-Qualified Plan. The
Board believes that a key ingredient in attracting, retaining and motivating
executives and other employees, advisors, consultants and directors is to offer
significant potential rewards based upon the Company's success through the
issuance of stock options. The amendments to the 1996 Plans increasing the
shares of common stock authorized for issuance presented herein to the
stockholders for their approval are designed to assist the Company in
accomplishing this goal. Of the 4,000,000 shares of common stock currently
authorized in the aggregate under the 1996 Plans, at March 28, 2000 an aggregate
of 649,059 shares remained available for future grants.


     The following summary description of the 1996 Plans is qualified in its
entirety by the full text of each of the 1996 Plans which may be obtained by the
Company's stockholders upon request to the Secretary of the Company.



     The last sale price of a share of the Company's common stock as reported by
the Nasdaq National Market on April 20, 2000 was $75 1/2.



     Purpose of the 1996 Plans.  The purpose of the 1996 Plans is to promote the
interests of the Company by affording executives and employees of the Company,
in the case of the 1996 ISO Plan, and consultants, advisors, directors and
employees of the Company, in the case of the 1996 Non-Qualified Plan, an
opportunity to acquire a proprietary interest in the Company pursuant to stock
options issued by the Company, and thus to create in such persons increased
personal interest in its continued success.


     Administration of the 1996 Plans.  The 1996 Plans are administered by the
Board or the Compensation Committee comprised of not less than two persons who
shall be appointed by the Board from among the members of the Board.

     The members of the Compensation Committee serve at the pleasure of the
Board, which has the power at all times to remove members from the Compensation
Committee or to add members thereto. Vacancies in the Compensation Committee,
however caused, are filled by action of the Board. All decisions or
determinations of the Compensation Committee are made by the majority vote or
decision of all of its members.

     The interpretation and construction by the Compensation Committee of the
provisions of the 1996 Plans or of the options granted thereunder are final
unless otherwise determined by the Board.

     Eligibility to Participate in the 1996 Plans.  Executives and employees of
the Company are eligible for the grant of options under the 1996 ISO Plan
("Incentive Stock Options"), and advisors, consultants, directors and employees
of the Company are eligible for the grant of options under the 1996
Non-Qualified Plan ("Non-Qualified Stock Options").

     Common Stock Subject to the 1996 Plans.  The number of shares of common
stock to be issued or sold pursuant to options granted under the 1996 Plans may
not exceed 4,000,000 shares. On April 14, 2000, the Board amended the 1996
Plans, subject to shareholder approval, to increase the number of shares of
common stock which may be issued in the aggregate under the 1996 Plans from
4,000,000 to 5,500,000. The shareholders are being asked to approve this
amendment at the Annual Meeting.

     If any change is made in the shares of common stock subject to the 1996
Plans or subject to any option granted under the 1996 Plans (through merger,
consolidation, reorganization, recapitalization, stock dividend, split-up,
combination of shares, exchange of shares, issuance of rights to subscribe, or
change in capital structure), appropriate adjustments shall be made by the
Compensation Committee as to the maximum number of shares subject to the 1996
Plans and the number of shares and price per share subject to

                                       19
<PAGE>   23

outstanding options as shall be equitable to prevent dilution or enlargement of
option rights. Any such determination made by the Compensation Committee shall
be final, binding and conclusive upon each participant.

     Amendments or Discontinuation of the 1996 Plans.  The Board may make such
amendments, changes and additions to either of the 1996 Plans, or may
discontinue and terminate either of the 1996 Plans, as it may deem advisable
from time to time; provided, however, that no action may affect or impair any
options theretofore granted under such plans, and provided, further, however,
that the affirmative vote of the owners of a majority of the outstanding shares
of common stock present at a meeting in person or by proxy and entitled to vote
at the meeting shall be necessary to effect any amendment to either of the 1996
Plans which would increase the number of shares of common stock subject to
options granted under such plan or, in the case of the 1996 ISO Plan only, which
would authorize Incentive Stock Options at a price below the fair market value
(or 110% thereof, if the employee receiving such grant owns more than 10% of the
voting securities of the Company at the time of the grant) of the shares of
common stock subject to the option.

     ERISA.  Neither of the 1996 Plans is subject to any provision of the
Employee Retirement Income Security Act of 1974, as amended ("ERISA").

DESCRIPTIONS OF OPTIONS

     Nontransferability.  Options granted pursuant to the 1996 Plans are not
transferable by the holder thereof, other than by will, the laws of descent and
distribution, or (if authorized in the applicable Stock Option Agreement),
pursuant to a qualified domestic relations order, as defined in the Code, or
Title I of ERISA or the rules thereunder or with respect to options granted
under the 1996 Non-Qualified Plan, to a member of the immediate family member of
the holder of the options, within the meaning of Rule 16a-1(e) of the Securities
and Exchange Act of 1934, as amended, a trust for such family members, a
partnership whose only partners are such family members or of a charitable
institution within the meaning of Section 501(c)(3) of the Code.

     Granting of Options.  The Board or the Compensation Committee shall
determine the executives, employees, consultants, advisors and directors to be
granted options under the respective plan, the number of shares of common stock
subject to such options, the exercise prices of options, the terms thereof and
any other provisions not inconsistent with the 1996 Plans. To the extent the
aggregate fair market value of common stock with respect to which Incentive
Stock Options are exercisable for the first time by any holder during any
calendar year (under all plans of the Company and its parent and subsidiary
corporations) exceeds the limitations of Section 422 of the Code (currently at
$100,000) (based upon the fair market value of such common stock on the date of
the grant of such options), those options exercisable with respect to those
shares valued in excess of $100,000 will be treated as Non-Qualified Stock
Options. All stock options granted pursuant to the 1996 Plans shall be evidenced
by stock option agreements or notices (the "Stock Option Agreements"), which
need not be identical, between the Company and the participant in such form as
the Compensation Committee shall from time to time approve, subject to the terms
of the 1996 Plans which may, but need not, be executed or acknowledged. Each
Stock Option Agreement shall state the total number of shares of common stock
with respect to which the option is granted, the terms and conditions of the
option and the exercise price or prices thereof.

     The 1996 Non-Qualified Plan provides that annually, on February 15 of each
of the Company's fiscal years, any Director of the Company who at the time is
not a full-time employee of the Company (a "Participating Director") will be
automatically granted an option for 15,000 shares of common stock (a
"Participating Director Option") and the Chairman of the Board who is not a
full-time employee of the Company (the "Participating Chairman") will be
automatically granted an option for 30,000 shares of common stock (a
"Participating Chairman Option"). Each person who becomes a Participating
Director or Participating Chairman after the first day of the Company's fiscal
year and within nine months of that date will be granted, on the date that
person becomes a Participating Director or Participating Chairman, a
Participating Director Option or Participating Chairman Option for a number of
shares of common stock determined by pro rating the normal grant amount based on
the period of time remaining in the fiscal year in

                                       20
<PAGE>   24

which such person becomes a Participating Director. No person who owns 10% or
more of the outstanding common stock of the Company (including shares of common
stock issuable upon exercise of outstanding options and warrants) will be
granted a Participating Director Option or Participating Chairman Option.

     Duration of the 1996 Plans.  Options may be granted under the 1996 ISO Plan
until February 25, 2006 and options may be granted under the 1996 Non-Qualified
Plan until June 3, 2006.

     Exercise Price.  The price at which the shares of common stock subject to
each option (other than Participating Director Options and Participating
Chairman Options) granted under the 1996 Plans may be purchased (the "option
price" or "exercise price") shall be determined by the Board or the Compensation
Committee, which shall have the authority at the time the option is granted to
prescribe in any Stock Option Agreement that the price per share, with the
passage of pre-determined periods of time, shall increase from the original
price to higher prices. Participating Director Options and Participating
Chairman Options have an exercise price equal to the fair market value of the
common stock on the date of the grant. Notwithstanding the foregoing, in no
event may the exercise price of an option granted under the 1996 ISO Plan be
less than 100% (110% in the case of 10% stockholders) of the fair market value
of the common stock on the date of the grant. The exercise price of all options
granted under each of the 1996 Plans is payable in full upon the exercise of
such option, which payment shall be in cash, by check or in stock (that has been
owned by the participant for at least six months) or notes of the Company, or,
as agreed to by the Board, other consideration. In the case of payment made in
stock of the Company, the stock shall be valued at its fair market value.

     Terms and Conditions of Exercise; Exercise Period.  The terms and
conditions of any option granted under the 1996 Plans and the exercise period
are governed by the Stock Option Agreement issued to the holder of the option.
Subject to the limitations set forth in the 1996 Plans, the terms of such Stock
Option Agreements, including the exercise period, are determined by the Board or
Compensation Committee and need not be uniform among recipients of similar
options. Except as set forth below, options (other than Participating Director
Options and Participating Chairman Options) granted pursuant to the 1996 Plans
may be exercised only if the participant was, at all times during the period
beginning on the date the option was granted and ending on the date of such
exercise, an advisor or consultant to or director or employee of the Company, in
case of options granted under the 1996 Non-Qualified Plan, or an employee of the
Company, in case of options granted under the 1996 ISO Plan. If a participant's
employment or service with the Company is terminated other than by reason of
death or disability (a) the right to exercise any unvested option or unvested
portion of any option granted under either of the 1996 Plans or any unexercised
option or portion of an option (whether or not vested) granted under the 1996
IS0 Plan prior to December 16, 1999 shall terminate on the date of termination
of the relationship between the participant and the Company and (b) the right to
exercise any option or portion of any option granted under the 1996
Non-Qualified Plan or granted on or after December 16, 1999 under the ISO Plan
which is vested as of the date of termination of employment or service shall
terminate upon the earlier of (i) the thirtieth day following such termination
of employment or service or (ii) the date of such option or portion of an option
would have expired had it not been for the termination of employment or service.
The option may not be exercised after its expiration in accordance with the
foregoing, and the shares of common stock subject to the unexercised portion of
such option may again be subject to new options under the 1996 Plans. In the
event a participant dies or is disabled while he is an advisor or consultant to
or a director or employee of the Company, any options (other than Participating
Director Options and Participating Chairman Options) theretofore granted to him
shall be exercisable only within the next 12 months immediately succeeding such
death or disability and then only (a) in the case of death, by the person or
persons to whom the participant's rights under such option shall pass by will or
the laws of descent and distribution, and in the case of disability, by such
participant or his legal representatives and (b) if and to the extent that he
was entitled to exercise such option at the date of his death or disability
except as otherwise provided in connection with a particular option or a
particular individual's death or disability. Participating Director Options and
Participating Chairman Options remain exercisable for ten years after the date
of grant and the option holder (or his legal representative or that of his
estate) may continue to exercise an option notwithstanding that the holder
ceases to be a Participating Director or Participating Chairman. The maximum
option term under the 1996 Plans is ten years after the date of grant (or in the
case of an Incentive

                                       21
<PAGE>   25

Stock Option granted to a 10% stockholder, five years after the date of grant).

FEDERAL INCOME TAX CONSEQUENCES OF PARTICIPATION IN THE 1996 PLANS


     The following discussion is intended only as a general summary of the
federal income tax consequences to holders of options with respect to their
participation in the 1996 Plans and does not discuss all of the tax consequences
that may be relevant to a holder of options in light of such holder's particular
tax circumstances. The discussion is based on the current provisions of the Code
and regulations, administrative rulings and judicial decisions now in effect
(or, in the case of certain Treasury regulations, proposed), all of which are
subject to change at any time (possibly with retroactive effect) or different
interpretations. The discussion does not address tax consequences under the laws
of any state, locality or foreign jurisdiction and the tax treatment of each
holder will depend in part upon such holder's particular tax situation.


     None of the 1996 Plans is qualified under Section 401 (a) of the Code.

INCENTIVE STOCK OPTIONS

     Holders of Incentive Stock Options will not recognize any income upon the
grant of their options. A holder of an Incentive Stock Option will also not
generally recognize any income upon the exercise of such option and, except as
provided below, such holder's basis in the shares of common stock received upon
exercise of an Incentive Stock Option ("ISO stock") will be equal to the
exercise price paid for such shares. In general, upon the sale or disposition of
ISO stock, a holder will recognize capital gain or loss equal to the difference
between the amount realized from such sale or disposition and such holder's
adjusted basis in the ISO stock.


     If, however, a holder disposes of ISO stock (i) within two years from the
date of the granting of the option or (ii) within one year after the date the
option was exercised (each a "disqualifying disposition"), the holder will
recognize ordinary income equal to the excess, if any, of the fair market value
of the ISO stock on the exercise date over the exercise price. The amount of
such income will be added to the holder's adjusted basis in the ISO stock for
purposes of determining the amount of the holder's gain on the disposition of
such stock. In the event that the selling price received by a holder in a
disqualifying disposition is less than the fair market value of the ISO stock on
the date the option was exercised, the amount of ordinary income recognized by
the holder will be limited to an amount equal to the excess of the amount
received by the holder in the disqualifying disposition over the adjusted basis
of the ISO stock (i.e., the exercise price of the Incentive Stock Option). The
holder's capital gain or loss on the sale or disposition of ISO stock will be
long-term gain or loss if the shares have been held for more than one year.
Consideration received by a holder of an option upon surrender to, or
cancellation by the Company will be recognized by the holder as ordinary income
(subject to wage withholding if applicable) and generally will be allowed as an
income tax deduction to the Company.


     In general, upon the exercise of any Incentive Stock Option, an amount
equal to the excess of the fair market value of the ISO stock on the exercise
date and the exercise price will be treated as an item of adjustment for
purposes of the federal alternative minimum tax. If, however, a disqualifying
disposition occurs in the same taxable year in which the exercise occurs, the
maximum amount that will be treated as an item of adjustment will be an amount
equal to the excess of the amount received in the disqualifying disposition over
the exercise price of the Incentive Stock Option.

NON-QUALIFIED STOCK OPTIONS

     Holders of Non-Qualified Stock Options will also not recognize any income
upon the grant of their options. However, a holder of a Non-Qualified Stock
Option will recognize ordinary income (subject to wage withholding, if
applicable) upon exercise of such option in an amount equal to the excess, if
any, of the fair market value of the shares of common stock received upon
exercise (the "Non-ISO stock") over the exercise price. Such holder's basis in
the Non-ISO stock will equal the stock's fair market value at such time, and the
holding period will begin on the date the stock is transferred to the holder. In
general, upon the subsequent sale or disposition of Non-ISO stock, depending on
the period held, the holder will recognize short-term or
                                       22
<PAGE>   26

long-term capital gain or loss equal to the difference between the amount
realized from such sale or disposition and such holder's adjusted basis in the
stock.


     A holder's capital gain or loss on the sale or disposition of Non-ISO stock
will be long-term gain or loss if the shares have been held for more than one
year. Consideration received by a holder of an option upon surrender to, or
cancellation by, the Company will be recognized by the holder as ordinary income
(subject to wage withholding, if applicable) and generally will be allowed as an
income tax deduction to the Company.


     In general, to the extent the aggregate fair market value of common stock
with respect to which Incentive Stock Options are exercisable for the first time
by any holder during any calendar year (under all plans of the Company and its
parent and subsidiary corporations) exceeds $100,000 (based upon the fair market
value of such common stock on the date of the grant of such options), those
options exercisable with respect to those shares valued in excess of $100,000
will be treated as Non-Qualified Stock Options. For purposes of applying this
rule (i) options will be taken into account in the order in which they were
granted, and (ii) the fair market value of any common stock will be determined
as of the time the option with respect to such common stock is granted.

     The foregoing does not purport to be a complete summary of the federal
income tax considerations that may be relevant to holders of options or to the
Company. It does not reflect provisions of the income tax laws of any
municipality, state or foreign country in which an optionee may reside, nor does
it reflect the tax consequences of an optionee's death.

NEW PLAN BENEFITS


     Other than option grants of Participating Director Options, the benefits or
amounts that will be received or allocated in the future under the 1996 Plans
are not determinable.


     THE BOARD RECOMMENDS A VOTE "FOR" APPROVAL OF THE AMENDMENTS TO THE 1996
PLANS TO INCREASE THE TOTAL NUMBER OF SHARES OF COMMON STOCK WHICH MAY BE ISSUED
PURSUANT TO OPTIONS WHICH MAY BE GRANTED UNDER THE 1996 PLANS FROM 4,000,000 TO
5,500,000 (PROPOSAL NO. 2 ON YOUR PROXY CARD).

                                 PROPOSAL NO. 3

          APPROVAL TO AMEND THE COMPANY'S CERTIFICATE OF INCORPORATION
          TO INCREASE THE NUMBER OF AUTHORIZED SHARES OF COMMON STOCK

     At present, the Company is authorized to issue two classes of capital stock
consisting of common stock with a par value of $.001 per share and preferred
stock with a par value of $1.00 per share. 60,000,000 shares of common stock and
4,000,000 shares of preferred stock are currently authorized. As of March 28,
2000, 400,000 shares of preferred stock had been issued and designated as series
A convertible preferred stock (the "series A preferred stock") of which 300,000
shares of series A preferred stock were outstanding. As of March 28, 2000 there
were approximately:

     - 31,238,444 shares of common stock issued and outstanding.


     - 6,510,047 shares of common stock reserved for issuance for options issued
       and outstanding, including under the Company's various option plans.


     - 1,177,520 shares of common stock reserved for issuance pursuant to
       outstanding warrants.

     - 1,956,157 shares of common stock reserved for issuance under the
       Company's various option plans and 1998 Employee Stock Purchase Plan.

     - 499,610 shares of common stock reserved for issuance pursuant to 300,000
       shares of outstanding series A preferred stock. 100,000 of the series A
       preferred stock are currently convertible into 249,610 shares of common
       stock. An additional 100,000 will be able to be converted into shares of
       common stock on or after each of January 1, 2001 and January 1, 2002. Any
       series A preferred stock converted into common stock before January 1,
       2001 will be converted at a conversion price of $40.063 per share of

                                       23
<PAGE>   27

       common stock. After that, the number of shares of common stock into which
       shares of series A preferred stock are convertible is not fixed. Instead,
       the conversion price is determined under a formula based upon the market
       price of our common stock at specified measurement dates, which are
       generally one year apart. Because, except for the current tranche, the
       exact number of shares needed to be reserved cannot be determined due to
       the fluctuating market price, the Company has currently reserved a number
       of shares for the current tranche equal to 249,610 and a number of shares
       for all subsequent tranches based on recent market prices. A different
       number of shares could be required based on fluctuations in the price of
       the common stock.

     - 340,909 shares of common stock reserved for issuance as shares of common
       stock that may be issued in the event the Company achieves certain
       milestones in the development of IMC-C225, our lead therapeutic product
       pursuant to the terms of a Development and License Agreement entered into
       with Merck KGaA in December 1998. Under this agreement, Merck KGaA is
       paying to the Company, among other things, $30 million assuming the
       Company achieves certain milestones for which Merck KGaA will receive
       equity (the "Milestone Shares") in ImClone which will be priced at
       varying premiums to the then market price of the common stock depending
       upon the timing of the achievement of the respective milestones. Because
       the exact number of shares needed to be reserved cannot be determined due
       to the fluctuating market price and the undetermined premium, the Company
       has currently reserved a number of shares based upon recent market prices
       and an assumed premium of 10%. A different number of shares could be
       required based on fluctuations in the price of the common stock.

     - 2,178,254 shares of common stock reserved for issuance upon conversion of
       our 5.5% convertible subordinated notes due 2005. In February 2000, we
       completed the private placement of $240 million in convertible
       subordinated notes due March 1, 2005. We received net proceeds from this
       offering of approximately $232.2 million, after deducting expenses
       associated with the offering. The notes bear interest at an annual rate
       of 5.5% interest payable semi-annually on September 1 and March 1 of each
       year, beginning September 1, 2000. A holder may convert all or a portion
       of a note into common stock at any time on or before March 1, 2005 at a
       conversion price of $110.18 per share, subject to adjustment if certain
       events affecting our common stock occur.


     Accordingly, giving effect to such issuances and reserves, approximately
16,099,059 shares of common stock of the 60,000,000 currently authorized would
remain available for issuance. If Proposal No 2 described in this proxy
statement is approved by shareholders at the meeting, approximately 14,599,059
shares of common stock would remain available for issuance.


     The Board of Directors believes that it is in the best interests of the
Company to increase the authorized number of shares of common stock from
60,000,000 to 120,000,000, and on April 14, 2000 the Board voted unanimously to
submit to a vote of stockholders an amendment to the Company's certificate of
incorporation so increasing the authorized common stock. The Company has no
present agreement, commitment, plan or intent to issue any of the additional
shares of common stock provided for in this Proposal other than as discussed
herein. If this Proposal is approved, the additional authorized common stock, as
well as the currently authorized but unissued common stock (but for those shares
which are reserved), would be immediately available in the future for such
corporate purposes as the Board deems advisable from time to time without
further action by the stockholders, unless such action is required by applicable
law or any stock exchange or securities market upon which the Company's shares
may be listed.

     The additional authorized common stock resulting from the approval of this
Proposal will have the same terms and rights as the existing common stock.
Holders of the common stock of the Company do not presently have preemptive
rights nor will they as a result of the approval of this Proposal.

     The Board anticipates that the authorized common stock in excess of those
shares issued and reserved for issuance (including, if authorized, the
additional common stock provided for in this Proposal) will be utilized for
general corporate purposes, including grants of stock options. These shares may
also be publicly sold or privately placed as part of financing transactions and
may be utilized by the Company in connection with acquisitions, commercial
agreements and stock splits. Such increase in shares also could be used to make
                                       24
<PAGE>   28


more difficult a change in control of the Company. Though the Company has no
current plan or intention to issue such shares as a takeover defense, the
additional authorized shares could be used to discourage persons from attempting
to gain control of the Company or make more difficult the removal of management.
Management is not currently aware of any specific effort to obtain control of
the Company by means of a merger, tender offer, solicitation in opposition to
management, or otherwise. Management may itself from time to time consider a
number of strategic alternatives designed to increase shareholder value,
including joint ventures, acquisitions and other forms of alliances as well as
the sale of all or part of the Company, and may determine to issue shares in
connection with such a transaction.


     It should be noted that, subject to the limitations discussed above, all of
the types of Board action described in the preceding paragraphs can currently be
taken and the power of the Board to take such actions would not be enhanced by
the passage of this Proposal, although this Proposal would increase the number
of shares of common stock that are subject to such action.

     If this Proposal is approved and the amendment to the certificate of
incorporation becomes effective, the first paragraph of Article Fourth of the
certificate of incorporation, which sets forth the Company's presently
authorized capital stock, will be amended to read as set forth below.

         "FOURTH: The total number of shares of capital stock which the
         Corporation shall have the authority to issue is one hundred
         twenty million (120,000,000) shares of common stock with a par
         value of one tenth of one cent ($.001) per share and four
         million (4,000,000) shares of preferred stock with a par value
         of one dollar ($1.00) per share."

     THE BOARD RECOMMENDS A VOTE "FOR" APPROVAL OF THE AMENDMENT TO THE
COMPANY'S CERTIFICATE OF INCORPORATION TO INCREASE THE TOTAL NUMBER OF
AUTHORIZED SHARES OF COMMON STOCK FROM 60,000,000 TO 120,000,000 (PROPOSAL NO. 3
ON YOUR PROXY CARD).

                                 PROPOSAL NO. 4
          APPROVAL OF AMENDMENTS BY THE COMPENSATION AND STOCK OPTION
     COMMITTEE TO OPTIONS HELD BY THE PRESIDENT AND CHIEF EXECUTIVE OFFICER
          AND THE EXECUTIVE VICE PRESIDENT AND CHIEF OPERATING OFFICER


     The shareholders are being asked to amend an option to purchase 1,000,000
shares of common stock held by Dr. Samuel D. Waksal and an option to purchase
650,000 shares held by Dr. Harlan W. Waksal. These options were granted with
shareholder approval in May 1999. On December 16, 1999, the Compensation
Committee, subject to shareholder approval, approved amendments to the options.
This proposal is being submitted to the shareholders for their consideration of,
and vote on, such amendments. The last reported sale price of the common stock
as reported by the Nasdaq National Market on April 20, 2000 was $75 1/2.


PROPOSED AMENDMENTS TO OPTIONS


     The Compensation Committee has approved, subject to shareholder approval,
amendments to the vesting terms of an option to purchase 1,000,000 shares of
common stock held by Dr. Samuel D. Waksal and an option to purchase 650,000
shares of common stock held by Dr. Harlan W. Waksal. The amendments provide that
each tranche vests immediately upon achievement of the relevant stock target
price associated with such tranche without regard to the passage of time which
was a requirement in the original options. As of the date of this proxy
statement, all stock target prices have been achieved and if the amendments are
approved by the Company's shareholders at the Annual Meeting, Dr. Samuel D.
Waksal's option to purchase 1,000,000 shares of common stock and Dr. Harlan W.
Waksal's option to purchase 650,000 shares of common stock will become fully
vested and exercisable upon such shareholder approval. The options are included
in the table "Option and Warrant Exercise Values for Fiscal 1999" as
unexercisable options. The Company does not expect to recognize accounting
charges as a result of the amendments. Except for the foregoing, the terms of
the options will remain unchanged.


                                       25
<PAGE>   29

     The Compensation Committee believes that the amendments to the vesting
provisions of the options would coincide with the original understanding of Dr.
Samuel D. Waksal and Dr. Harlan W. Waksal concerning the vesting of the various
tranches. In light of each of Dr. Samuel D. Waksal's and Dr. Harlan W. Waksal's
continued contributions to the Company and the continued success of the Company,
the Board believes it is appropriate that the options vest immediately upon
stock target price achievement without regard to the passage of time.

ORIGINAL TERMS OF OPTIONS


     That which follows is a description of the original options, which are
proposed to be amended as set forth above. The original options were granted
with shareholder approval on May 24, 1999 at a per share purchase price of
$18.25, the fair market value of a share of the Company's common stock on the
date of grant. By their terms, the original options vest in their entirety on
May 24, 2006, but may vest as to 20% of the shares annually on the anniversary
of the date of grant if certain targets in the Company's common stock prices are
achieved during the preceding year. In order for each respective tranche to vest
under the original terms of the options, the target price must be maintained for
ten consecutive trading days. The target prices set under the original options
are $24 between May 1999 and May 2000; $34 between May 2000 and May 2001; $47
between May 2001 and May 2002; $62 between May 2002 and May 2003; and $75
between May 2003 and May 2004.



     Additionally, the options vest on any given vesting date for which the
applicable target price was achieved as to any shares as to which the options
did not vest on any prior vesting date as a result of the target price not
having been achieved. The options also will vest in the event of an acquisition
of the Company where Dr. Samuel D. Waksal's or Dr. Harlan Waksal's position,
respectively, with the Company is terminated. The options otherwise contain
terms substantially the same as those contained in the Company's 1996 Non-
Qualified Plan discussed under Proposal No. 2.



     Once vested as to any shares, the options may be exercised in whole or in
part as to such shares from time to time until May 24, 2009 so long as the
holder remains employed by the Company. Payment of the exercise price of the
options must be made in full in cash at the time of exercise. The options also
provide for certain adjustments in the event of certain mergers, consolidations,
reorganizations, recapitalizations, stock dividends, split-ups continuations or
similar events involving the Company or common stock.



     It is the intent of the Board that there be no additional option grants to
either until 2003 at the earliest.


     All decisions regarding administration of the options are made by the Board
or a duly authorized committee of the Board.

     The options are not subject to any provision of ERISA.

     The common stock which may be purchased by exercise of the options has not
been registered under the Securities Act of 1933, as amended (the "Securities
Act") and once registered will permit the sale of the stock freely after
exercise, except that the seller is limited to the volume restrictions contained
in Rule 144 under the Securities Act.

     The form of options as proposed to be amended are available from the
Secretary of the Company.

U.S. FEDERAL INCOME TAX CONSEQUENCES


     The following is a summary of the U.S. Federal income tax consequences
under current tax law (without regard to any proposed changes, which may be
retroactive in effect) with respect to the options. For this purpose, it is
assumed that the shares acquired pursuant to the exercise of the options are
held as a capital asset. The amendments to the vesting schedule will not result
in a taxable event.


     The options are not qualified under Section 401(a) of the Code. No taxable
income was recognized by the holders upon the grant of the options. Upon the
exercise of the options, the excess of the fair market value of the shares at
the time of such exercise over the exercise price will be treated as
compensation. Any amounts treated as compensation (i) will be taxable as
ordinary income to the holder and (ii) generally will be allowed as an income
tax deduction to the Company. The holders' tax basis for shares acquired upon
exercise of the

                                       26
<PAGE>   30

options will be increased by any amounts so treated as compensation. Any gain or
loss realized on the subsequent sale of shares acquired upon the exercise of the
options will be short-term or long-term capital gain depending on the period the
shares were held. Consideration received upon the surrender to, or cancellation
by, the Company of the options will be taxable as ordinary income to the holder
and generally allowed as an income tax deduction to the Company.

     THE BOARD RECOMMENDS A VOTE "FOR" APPROVAL OF AMENDMENTS TO OPTIONS HELD BY
EACH OF THE COMPANY'S PRESIDENT AND CHIEF EXECUTIVE OFFICER AND THE COMPANY'S
EXECUTIVE VICE PRESIDENT AND CHIEF OPERATING OFFICER (PROPOSAL NO. 4 ON YOUR
PROXY CARD).

                                 PROPOSAL NO. 5

            RATIFICATION OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

     The Board has selected KPMG LLP as independent certified public accountants
for the Company for the year ending December 31, 2000. KPMG LLP has served as
the Company's auditor since 1988. The ratification of the selection of
independent certified public accountants is to be voted upon at the meeting, and
it is intended that the persons named in the accompanying proxy will vote for
KPMG LLP. Representatives of KPMG LLP are expected to attend the meeting, to
have an opportunity to make a statement if they desire to do so and to be
available to respond to appropriate questions.

     THE BOARD RECOMMENDS A VOTE "FOR" THE RATIFICATION OF THE SELECTION OF KPMG
LLP TO ACT AS THE COMPANY'S CERTIFIED PUBLIC ACCOUNTANTS FOR THE YEAR ENDING
DECEMBER 31, 2000 (PROPOSAL NO. 5 ON YOUR PROXY CARD).

                            STOCKHOLDERS' PROPOSALS

     A stockholder proposal intended to be presented at the Company's Annual
Meeting of Stockholders to be held in 2001 must be received by the Company on or
before January 1, 2001 in order to be included in the Company's proxy statement
and form of proxy relating to that meeting.

     Please complete, sign and date the enclosed proxy card, which is revocable
as described herein, and mail it promptly in the enclosed postage-paid envelope.

                                          By Order of the Board of Directors

                                          /s/ John B. Landes

                                          John B. Landes
                                          Secretary

New York, New York

April 25, 2000


     IT IS IMPORTANT THAT PROXIES BE RETURNED PROMPTLY.  WE URGE YOU TO FILL IN,
SIGN AND RETURN THE ACCOMPANYING PROXY CARD, NO MATTER HOW LARGE OR SMALL YOUR
HOLDINGS MAY BE.

                                       27
<PAGE>   31

                                                                      APPENDIX A

                          IMCLONE SYSTEMS INCORPORATED

Dear Stockholder:

     Please take note of the important information enclosed with this Proxy
Ballot. There are a number of issues related to the management and operation of
your Company that require your immediate attention and approval. These are
discussed in detail in the enclosed proxy materials.

     Your vote counts, and you are strongly encouraged to exercise your right to
vote your shares.

     Please mark the boxes on this proxy card to indicate how your shares shall
be voted, then sign the card, detach it and return your proxy vote in the
enclosed postage paid envelope.

     Your vote must be received prior to the Annual Meeting of Shareholders, May
31, 2000.

     Thank you in advance for your prompt consideration of these matters.

                                          Sincerely,

                                          ImClone Systems Incorporated

                                       A-1
<PAGE>   32

                          IMCLONE SYSTEMS INCORPORATED

              PROXY FOR THE MEETING OF STOCKHOLDERS, MAY 31, 2000
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoints Robert F. Goldhammer, John B. Landes and Samuel
D. Waksal as Proxies each with power of substitution and hereby authorizes each
of them to represent and to vote, as designated below, all the shares of Common
Stock of ImClone Systems Incorporated held of record by the undersigned on April
7, 2000 at the Annual Meeting of Stockholders to be held at 10:00 a.m. on May
31, 2000 or any adjournment thereof.

PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY TO EQUISERVE. THE COMPANY'S
TRANSFER AGENT, TO BE RECEIVED NO LATER THAN MAY 30, 2000.

This Proxy when properly executed will be voted in the manner directed herein by
the undersigned stockholder. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED
FOR PROPOSALS 1,2,3,4 AND 5.

PLEASE VOTE, DATE AND SIGN ON REVERSE AND RETURN PROMPTLY IN THE ENCLOSED
ENVELOPE

NOTE:  PLEASE SIGN EXACTLY AS YOUR NAME(S) APPEAR(S) ON THIS CARD. ALL JOINT
OWNERS SHOULD SIGN. WHEN SIGNING AS EXECUTOR, ADMINISTRATOR, ATTORNEY, TRUSTEE
OR GUARDIAN OR AS CUSTODIAN FOR A MINOR, PLEASE GIVE FULL TITLE AS SUCH. IF A
CORPORATION, PLEASE SIGN IN FULL CORPORATE NAME AND INDICATE THE SIGNER'S
OFFICE. IF A PARTNER, SIGN THE PARTNERSHIP NAME.

HAS YOUR ADDRESS CHANGED?DO YOU HAVE ANY COMMENTS?

- ------------------------------------------------------------
- ------------------------------------------------------------

- ------------------------------------------------------------
- ------------------------------------------------------------

- ------------------------------------------------------------
- ------------------------------------------------------------
<PAGE>   33


[X] PLEASE MARK VOTES AS IN THIS EXAMPLE        Mark box at right if you plan to
attend the meeting [ ]


ImClone Systems Incorporated   Mark box at right if an address change or comment
has been noted on the reverse side of this card. [ ]

RECORD DATE SHARES:

1) ELECTION OF DIRECTORS. For: [ ]   Withhold: [ ]   For All Except: [ ]
<TABLE>
<S>                     <C>                     <C>                     <C>                     <C>
Nominees:               RICHARD BARTH           ROBERT F. GOLDHAMMER    PAUL B. KOPPERL         JOHN MENDELSOHN
                        VINCENT T. DEVITA, JR.  DAVID M. KIES           ARNOLD LEVINE           WILLIAM R. MILLER

<S>                     <C>
Nominees:               HARLAN W. WAKSAL
                        SAMUEL D. WAKSAL
</TABLE>

NOTE: IF YOU DO NOT WISH YOUR SHARES VOTED "FOR" A PARTICULAR NOMINEE, MARK THE
"FOR ALL EXCEPT" BOX AND STRIKE A LINE THROUGH THE NAME(S) OF THE NOMINEE(S).
YOUR SHARES SHALL BE VOTED FOR THE REMAINING NOMINEE(S).

2) To approve amendments to the Company's 1996 Incentive Stock Option Plan, as
   amended (the "1996 ISO Plan") and the Company's 1996 Non-Qualified Stock
   Option Plan, as amended (the "1996 Non-Qualified Plan") to increase the
   number of shares of the Company's common stock which are authorized to be
   issued in the aggregate under the 1996 ISO Plan and the 1996 Non-Qualified
   Plan from 4,000,000 to 5,500,000.
     For: [ ]  Against: [ ]  Abstain: [ ]

3) To approve an amendment to the Company's certificate of incorporation to
   increase the number of shares of common stock the Company is authorized to
   issue from 60,000,000 to 120,000,000.
     For: [ ]  Against: [ ]  Abstain: [ ]


4) To approve amendments to the options held by the President and Chief
   Executive Officer and the Executive Vice President and Chief Operating
   Officer of the Company.

     For: [ ]  Against: [ ]  Abstain: [ ]

5) To ratify the appointment of KPMG LLP to serve as the Company's independent
   certified public accountants for the fiscal year ending December 31, 2000.
     For: [ ]  Against: [ ]  Abstain: [ ]

6) To consider and act upon any other business as may come before the meeting or
   any adjournment thereof.

                                          [ ] PLEASE CHECK THIS BOX IF YOU
                                          EXPECT TO ATTEND THE MEETING

                                          Please be sure to sign and date this
                                          Proxy.             Date:

                                          --------------------------------------
                                          Stockholder sign
                                          here                        Co-owner
                                          sign here


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