REGENERON PHARMACEUTICALS INC
DEF 14A, 2000-05-01
PHARMACEUTICAL PREPARATIONS
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<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            Schedule 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(X) Filed by the Registrant
( ) Filed by a party other than the Registrant

Check the appropriate box:

( ) Preliminary Proxy Statement
(X) Definitive Proxy Statement
( ) Definitive Additional Materials
( ) Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12

                         Regeneron Pharmaceuticals, Inc.
 ------------------------------------------------------------------------------
                (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 Rule 14a-6(i)(l) 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. Indentify the provious 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>

              Regeneron Pharmaceuticals, Inc.

                                                                          Proxy
                                                                      Statement

NOTICE OF ANNUAL MEETING OF
SHAREHOLDERS

TO BE HELD ON JUNE 9, 2000

Regeneron Pharmaceuticals, Inc.
777 Old Saw Mill River Road
Tarrytown, New York  10591-6707
(914) 345-7400

Dear Shareholder:

The Annual Meeting of Shareholders of Regeneron Pharmaceuticals, Inc. will be
held at the Westchester Marriott Hotel, 670 White Plains Road, Tarrytown, New
York 10591 at 10:30 a.m., Eastern Daylight Savings Time, on Friday, June 9,
2000.

The purposes of the meeting are:

o To elect three Directors for a term of three years;

o To approve the adoption of the Regeneron Pharmaceuticals, Inc. 2000 Long-Term
Incentive Plan;

o To approve the selection of PricewaterhouseCoopers LLP as independent
accountants for the fiscal year ending December 31, 2000; and

o To act upon such other matters as may properly come before the meeting and any
adjournment or postponement thereof.

These items are more fully described in the following pages, which are hereby
made a part of this Notice. The Board of Directors has fixed the close of
business on April 14, 2000 as the record date for the determination of
shareholders entitled to notice of and to vote at the meeting and at any
adjournment or postponement thereof.

Whether or not you plan to attend the Annual Meeting, please complete, sign, and
date the accompanying proxy and return it promptly in the enclosed prepaid
envelope. If you attend the Annual Meeting, you may vote in person if you wish,
even if you have previously returned your proxy.

By Order of the Board of Directors,

Murray A. Goldberg
Assistant Secretary
Tarrytown, New York
May 8, 2000


<PAGE>

Regeneron Pharmaceuticals, Inc.
777 Old Saw Mill River Road
Tarrytown, New York 10591
(914) 345-7400

                                                                     May 8, 2000

Dear Shareholder:

      You are cordially invited to attend the Annual Meeting of Shareholders of
Regeneron Pharmaceuticals, Inc. to be held on Friday, June 9, 2000 at 10:30 a.m.
at the Westchester Marriott Hotel, 670 White Plains Road, Tarrytown, New York
10591.

      Whether or not you plan to attend the Annual Meeting, please mark, sign,
and date the accompanying proxy and return it promptly in the enclosed prepaid
envelope. If you attend the Annual Meeting, you may vote in person if you wish,
even if you have previously returned your proxy.

                                            Sincerely,

                                            P. Roy Vagelos, M.D.
                                            Chairman of the Board of Directors


<PAGE>

Proxy Statement
2000 Annual Meeting of
Shareholders of
Regeneron Pharmaceuticals, Inc.
- -------------------------------------------------------------------------------

Proxy Solicitation

This Proxy Statement is furnished to the shareholders of Regeneron
Pharmaceuticals, Inc., a New York corporation (the "Company"), in connection
with the solicitation by its Board of Directors from holders of the Company's
Common Stock (the "Common Stock") and Class A Common Stock (the "Class A Stock")
of proxies to be voted at the Annual Meeting of Shareholders of the Company to
be held on Friday, June 9, 2000 at 10:30 a.m., at the Westchester Marriott
Hotel, 670 White Plains Road, Tarrytown, New York 10591, and at any adjournment
or postponement thereof (the "Annual Meeting"), for the purposes set forth in
the accompanying Notice of Annual Meeting of Shareholders. The Company's
executive offices are located at 777 Old Saw Mill River Road, Tarrytown, New
York 10591.

This Proxy Statement and form of proxy are first being mailed to shareholders of
the Company on or about May 8, 2000. All proxies duly executed and received
prior to or at the Annual Meeting, and not revoked, will be voted on all matters
presented at the meeting in accordance with the instructions indicated on such
proxies. In the absence of instructions, proxies so received will be voted (1)
FOR the named nominees to the Company's Board of Directors, (2) FOR the approval
of the Regeneron Pharmaceuticals, Inc. 2000 Long-Term Incentive Plan, and (3)
FOR the approval of PricewaterhouseCoopers LLP as independent accountants for
the Company's fiscal year ending December 31, 2000. If any other matters are
properly presented at the Annual Meeting for consideration, the persons named in
the enclosed form of proxy will have discretion to vote on such matters in
accordance with their best judgment.

Any proxy given pursuant to this solicitation may be revoked by (i) filing with
an Assistant Secretary of the Company or a designee thereof, at or before the
taking of the vote at the Annual Meeting, a written notice of revocation bearing
a later date than the proxy, (ii) duly executing a later dated proxy relating to
the same shares and delivering it to an Assistant Secretary of the Company or a
designee thereof before the taking of the vote at the Annual Meeting, or (iii)
attending the Annual Meeting and voting in person (although attendance at the
Annual Meeting will not in and of itself constitute the revocation of a proxy).
Any written notice of revocation or subsequent proxy should be sent so as to be
delivered to Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road,
Tarrytown, New York 10591, Attention: Assistant Secretary, or hand delivered to
an Assistant Secretary of the Company or a designee thereof at or before the
taking of the vote at the Annual Meeting. The persons named as proxies in the
enclosed form of proxy, Leonard S. Schleifer, M.D., Ph.D. and P. Roy Vagelos,
M.D., were selected by the Board of Directors of the Company.

Record Date & Voting at the Annual Meeting

The Board of Directors of the Company has fixed the close of business on April
14, 2000 as the record date for the determination of the shareholders entitled
to notice of, and to vote at, the Annual Meeting. Accordingly, only holders of
record of Common Stock and Class A Stock on the record date will be entitled to
notice of, and to vote at, the Annual Meeting. As of April 14, 2000, 32,277,200
shares of Common Stock and 2,773,950 shares of Class A Stock were outstanding.
The Common Stock and the Class A Stock vote together on all matters as a single
class, with the Common Stock being entitled to one vote per share and the Class
A Stock being entitled to ten votes per share. No other voting securities of the
Company were outstanding on the record date. The holders of a majority of the
shares issued and outstanding attending personally or by proxy will constitute a
quorum for the transaction of business at the Annual Meeting.

Election of directors will be determined by a plurality of the votes cast in
person or by proxy at the Annual Meeting. All other matters presented to
shareholders will be determined by the affirmative vote of a majority of the
votes cast in person or by proxy at the Annual Meeting. Under applicable New
York law, in determining whether any proposal has received the requisite number
of affirmative votes and tabulating the votes for directors, abstentions and
broker nonvotes will be disregarded and will have no effect on the outcome of
the vote.

Annual Report

The Company's Annual Report to Shareholders for the year ended December 31, 1999
is being furnished herewith on or about May 8, 2000 to shareholders of record.
The Annual Report to Shareholders does not constitute a part of the proxy
soliciting material. The Company has also filed with the Securities and Exchange
Commission a report on Form 10-K for the year ended December 31, 1999, a copy of
which will be furnished (except for exhibits) without charge to any shareholder
upon written request addressed to the Investor Relations Department of the
Company at the address shown above.


                                       1
<PAGE>

Security Ownership of Management

The following table sets forth, as of April 14, 2000, the number of shares of
the Company's Common Stock and Class A Stock beneficially owned by each of its
directors or nominees for directors, each of the named executive officers, and
all directors and executive officers as a group, and the percentage that such
shares represent of the total combined number of shares of outstanding Common
Stock and Class A Stock, based upon information obtained from such persons.

Management and Directors Stock Ownership Table as of April 14, 2000

<TABLE>
<CAPTION>
                                                                                                       Percentage
                                                                                                        of Common
                                                 Number of Shares                                        Stock
                                                 of Class A Stock          Number of Shares of      & Class A Stock
                                                   Beneficially                Common Stock            Beneficially
Name of Beneficial Owner                               Owned                Beneficially Owned             Owned
                                                        (1)                        (1)                      (2)

- ----------------------------------------------------------------------------------------------------------------------
<S>                                               <C>                         <C>                         <C>
Leonard S. Schleifer, M.D., Ph.D.                 1,769,340 (3)                 389,000 (7)                6.1%
P. Roy Vagelos, M.D.                                      0                   1,299,272 (8)                3.7%
Charles A. Baker                                     62,384 (4)                  60,591 (9)                   *
Michael S. Brown, M.D.                               60,749                     135,001 (10)                  *
Alfred G. Gilman, M.D., Ph.D.                       124,912                     135,001 (10)                  *
Joseph L. Goldstein, M.D.                            52,000                     116,668 (10)                  *
Fred A. Middleton c/o Sanderling Ventures            69,767 (5)                  78,019 (9)                   *
Eric M. Shooter, Ph.D.                               92,911                     135,001 (10)                  *
George L. Sing                                            0                     112,221 (9)                   *
Murray A. Goldberg                                        0                     105,400 (11)                  *
Hans-Peter Guler, M.D.                                    0                      24,000 (10)                  *
Randall R. Rupp, Ph.D.                                    0                     109,500 (10)                  *
George D. Yancopoulos, M.D., Ph.D.                   42,750 (6)                 470,250 (12)               1.4%

All Directors and Executive Officers              2,326,387                   3,421,370                   15.5%
   as a Group (22 persons)
- ---------------------------------------------------------
</TABLE>

*  Represents less than 1%

(1) The inclusion herein of any Class A Stock or Common Stock, as the case may
be, deemed beneficially owned does not constitute an admission of beneficial
ownership of those shares. Unless otherwise indicated, each person listed has
sole voting and investment power with respect to the shares listed.

(2) To calculate percentage, number of shares outstanding includes 35,051,150
shares outstanding as of April 14, 2000 plus any shares subject to options held
by the person or entity in question that are currently exercisable or
exercisable within sixty days after April 14, 2000.

(3) Includes 64,550 shares of Class A Stock held in trust for the benefit of Dr.
Schleifer's two sons, of which Dr. Schleifer disclaims beneficial ownership.
Excludes 32,000 shares of Class A Stock held by the Schleifer Family Foundation,
a charitable foundation, of which Dr. Schleifer disclaims beneficial ownership.

(4) Excludes shares owned by Sanderling Ventures, of which Mr. Baker is a
special limited partner.

(5) Fred A. Middleton, a Director of the Company, is a General Partner of
Sanderling Ventures, and the beneficial owner of the shares. Sanderling Ventures
consists of several entities: Sanderling Venture Partners II, L.P., Sanderling
Ventures Limited, L.P., and Sanderling Biomedical, L.P. Common stock also
includes 16,018 shares of Common Stock held directly by Mr. Middleton and 2,000
shares of Common Stock held in trust for the benefit of Mr. Middleton's
children, of which Mr. Middleton disclaims beneficial ownership.

(6) Includes 19,383 shares of Class A Stock held in trust for the benefit of Dr.
Yancopoulos's children and excludes 205 shares held by Dr. Yancopoulos's wife.
Dr. Yancopoulos disclaims beneficial ownership of all such shares.

(7) Includes 324,000 shares of Common Stock purchasable upon the exercise of
options granted pursuant to the 1990 Long-Term Incentive Plan which are
exercisable or become so within sixty days from April 14, 2000.


                                       2
<PAGE>

(8) Includes 6,666 shares of Common Stock purchasable upon the exercise of
options granted pursuant to the 1990 Long-Term Incentive Plan which are
exercisable or become so within sixty days from April 14, 2000.

(9) Includes 60,001 shares of Common Stock purchasable upon the exercise of
options granted pursuant to the 1990 Long-Term Incentive Plan which are
exercisable or become so within sixty days from April 14,2000.

(10) All shares of Common Stock beneficially owned represents shares of Common
Stock purchasable upon the exercise of options granted pursuant to the 1990
Long-Term Incentive Plan which are exercisable or become so within sixty days
from April 14, 2000.

(11) Includes 91,800 shares of Common Stock purchasable upon the exercise of
options pursuant to the 1990 Long-Term Incentive Plan which are exercisable or
become so within sixty days from April 14, 2000, and excludes 100 shares held
jointly as custodian for Mr. Goldberg's son, of which Mr. Goldberg disclaims
beneficial ownership.

(12) Includes 455,250 shares of Common Stock purchasable upon the exercise of
options pursuant to the 1990 Long-Term Incentive Plan which are exercisable or
become so within sixty days from April 14, 2000.

Security Ownership of Certain Beneficial Owners as of April 14, 2000

Set forth below is the name, address, and stock ownership of each person or
group of persons known by the Company to own beneficially more than 5% of the
outstanding shares of Common Stock and Class A Stock.

<TABLE>
<CAPTION>
                                                                                                 Percentage of
                                                                        Number of Shares       Shares of Common
                                                Number of Shares        of Common Stock        Stock and Class A
                                                of Class A Stock       Beneficially           Stock Beneficially
  Name and Address of Beneficial Owner         Beneficially Owned         Owned                     Owned
- ----------------------------------------------------------------------------------------------------------------
  <S>                                             <C>                     <C>                    <C>
  Leonard S. Schleifer, M.D., Ph.D.               1,769,340 (1)             389,000                6.1% (2)
    777 Old Saw Mill River Road
    Tarrytown, New York  10591

  Amgen Inc.                                              0               4,916,808               14.0% (3)
    One Amgen Center Drive
    Thousand Oaks, California 91320

  Procter & Gamble Pharmaceuticals, Inc.                  0               5,150,000               14.7% (4)
    One Procter & Gamble Plaza
    Cincinnati, Ohio  45242
</TABLE>
- ---------------------------------------------

(1) Includes 64,550 shares of Class A Stock held in trust for the benefit of Dr.
Schleifer's two sons, of which Dr. Schleifer disclaims beneficial ownership.
Excludes 32,000 shares of Class A Stock held by the Schleifer Family Foundation,
a charitable foundation, of which Dr. Schleifer disclaims beneficial ownership.

(2) Number of shares deemed outstanding includes 35,051,150 shares outstanding
as of April 14, 2000 plus 324,000 shares subject to options held by Dr.
Schleifer that are currently exercisable or exercisable within sixty days after
April 14, 2000.

(3) Number of shares deemed outstanding includes 35,051,150 shares outstanding
as of April 14, 2000.

(4) Number of shares deemed outstanding includes 35,051,150 shares outstanding
as of April 14, 2000, and does not include a warrant held by Procter & Gamble to
purchase 1,450,000 shares of Common Stock.


                                       3
<PAGE>

- -------------------------------------------------------------------------------
PROPOSAL NO. 1: ELECTION OF DIRECTORS

The Board of Directors Proposes the Election of Charles A. Baker, Michael S.
Brown, M.D., and George L. Sing for a Term of Three Years.

General

The Board of Directors is divided into three classes, denominated Class I, Class
II, and Class III, with members of each class holding office for staggered
three-year terms. There are currently three Class I Directors, whose terms
expire at the 2001 Annual Meeting, three Class II Directors, whose terms expire
at the 2002 Annual Meeting, and three Class III Directors, whose terms expire at
the 2000 Annual Meeting (in all cases subject to the election and qualification
of their successors and to their earlier death, resignation, or removal).

At each annual meeting of shareholders, the successors to directors whose terms
expire shall be elected to serve from the time of election and qualification
until the third annual meeting following their election and until a successor
has been duly elected and qualified. All of the nominees for Class III Directors
are currently Class III Directors of the Company. All of these nominees have
indicated a willingness to serve if elected, but if any should be unable or
unwilling to serve, proxies may be voted for substitute nominees designated by
the Board of Directors.

The following table contains information, as of April 14, 2000, with respect to
the persons who serve on the Board, including the persons who have been
nominated to serve an additional three-year term as directors.

<TABLE>
<CAPTION>
                                                                                                Served as a
                                                                                                Director             Class
   Name                                    Age         Position with the Company                Since                of Dir.
   ----                                    ---         -------------------------                -----                -------
   <S>                                     <C>         <C>                                      <C>                  <C>
   P. Roy Vagelos, M.D.  (1)               70          Chairman of the Board                    1995                 II
   Leonard S. Schleifer, M.D., Ph.D.       47          Director, Chief Executive Officer,       1988                 I
                                                       and President
   Eric M. Shooter, Ph.D. (1)              76          Director and Member of Scientific        1988                 I
                                                       Advisory Board
   Fred A. Middleton (2)                   50          Director                                 1990                 I
   Joseph L. Goldstein, M.D. (1)           60          Director and Member of Scientific        1991                 II
                                                       Advisory Board
   Alfred G. Gilman, M.D., Ph.D. (1)       58          Director and Member of Scientific        1990                 II
                                                       Advisory Board
   George L. Sing (2)(3)                   51          Director                                 1988                 III
   Charles A. Baker (2)(3)                 67          Director                                 1989                 III
   Michael S. Brown, M.D. (1)              59          Director and Member of Scientific        1991                 III
                                                       Advisory Board
</TABLE>
- ----------------------------------------------------------

      (1)      Member of the Technology Committee.
      (2)      Member of the Audit Committee.
      (3)      Member of the Compensation Committee.

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

Background of Nominees for Class III Directors

CHARLES A. BAKER, 67, has been a Director of the Company since February 1989.
Since December 1989, he has been the Chairman, President, and Chief Executive
Officer of The Liposome Company, Inc., a publicly held company. During his
career, Mr. Baker served in senior management capacities in various
pharmaceutical companies, including the positions of Group Vice President,
Squibb Corporation (now Bristol-Myers Squibb) and President, Squibb
International. He also held various senior executive positions at Abbott
Laboratories and Pfizer, Inc. Mr. Baker is a special limited partner in
Sanderling Ventures, which is a shareholder of Regeneron. See "Security
Ownership of Management."

MICHAEL S. BROWN, M.D., 59, has been a Director of the Company since June 1991
and a member of the Scientific Advisory Board since January 1988. Dr. Brown is
Professor of Medicine and Genetics and the Director of the Center for Genetic
Diseases at The University of Texas Southwestern Medical Center at Dallas. He is
a member of the National Academy of Sciences. He is a Director of Pfizer, Inc.
His scientific contributions in cholesterol and lipid metabolism were made in
collaboration with Dr. Joseph L. Goldstein. Drs. Brown and Goldstein jointly
received the Nobel Prize for Physiology or Medicine in 1985.


                                       4
<PAGE>

GEORGE L. SING, 51, has been a Director of the Company since January 1988. Since
1998, he has been a Managing Director of Caduceus Capital Partners, a venture
capital investment firm in the health care field. From 1993 to 1998, Mr. Sing
was a general partner of Zitan Capital Partners, an investment and advisory
firm. From February 1990 until February 14, 1991, he served as a consultant to
Merrill Lynch Venture Capital Inc. From 1982 to February 1990, Mr. Sing was a
Vice President and member of the Board of Directors of Merrill Lynch Venture
Capital, Inc., a venture capital firm.

- -------------------------------------------------------------------------------
Background of Directors Whose Terms are Continuing

- -------------------------------------------------------------------------------
Directors Whose Terms Expire at the 2001 Annual Meeting (Class I)

LEONARD S. SCHLEIFER, M.D., Ph.D., 47, founded the Company in 1988 and has been
its President and Chief Executive Officer since its inception and served as
Chairman of the Board from 1990 through 1994. In 1992, Dr. Schleifer was
appointed Clinical Professor of Neurology at the Cornell University Medical
School, and from 1984 to 1988 he was Assistant Professor at the Cornell
University Medical School in the Departments of Neurology and Neurobiology. Dr.
Schleifer received his M.D. and Ph.D. in Pharmacology from the University of
Virginia. Dr. Schleifer is a licensed physician and is certified in Neurology by
the American Board of Psychiatry and Neurology.  Dr. Schleifer is a member of
the Board of Directors of the Biotechnology Industry Organization.

ERIC M. SHOOTER, Ph.D., 76, a co-founder of the Company, has been a Director of
the Company and a member of the Scientific Advisory Board since 1988. Dr.
Shooter has been a Professor at Stanford University School of Medicine since
1968. He was the founding Chairman of the Department of Neurobiology at Stanford
University School of Medicine in 1975 and served as its Chairman until 1987. He
is a Fellow of the Royal Society of England, a Fellow of the American Academy of
Arts and Sciences, and a Foreign Associate of the Institute of Medicine of the
National Academy of Sciences.

FRED A. MIDDLETON, 50, has been a Director of the Company since July 1990. Mr.
Middleton is a General Partner of Sanderling Ventures, a venture capital firm he
co-founded with Dr. Robert McNeil in December 1987 specializing in early stage
biomedical companies. Sanderling Ventures is a shareholder of the Company. See
"Security Ownership of Management." Between 1984 and 1987, he was Managing
General Partner of Morgan Stanley Ventures and, from 1978 through 1984, was Vice
President and Chief Financial Officer of Genentech, Inc., and President,
Genentech Development Corporation.

- -------------------------------------------------------------------------------
Directors Whose Terms Expire at the 2002 Annual Meeting (Class II)

ALFRED G. GILMAN, M.D., Ph.D., 58, a co-founder of the Company, has been a
Director of the Company since July 1990 and a member of the Scientific Advisory
Board since 1988. Dr. Gilman has been the Raymond and Ellen Willie Professor of
Molecular Neuropharmacology and Chairman of the Department of Pharmacology at
The University of Texas Southwestern Medical Center at Dallas since 1981 and was
named a Regental Professor in 1995. Dr. Gilman is a member of the National
Academy of Sciences. He is the Consulting Editor of "Goodman and Gilman's The
Pharmacological Basis of Therapeutics," the leading medical pharmacology
textbook. Dr. Gilman received the Nobel Prize for Physiology or Medicine in
1994. Dr. Gilman is a member of the Board of Directors of Eli Lilly & Company.

JOSEPH L. GOLDSTEIN, M.D., 60, has been a Director of the Company since June
1991 and a member of the Scientific Advisory Board since January 1988. Dr.
Goldstein has been the Professor of Medicine and Genetics and Chairman of the
Department of Molecular Genetics at The University of Texas Southwestern Medical
Center at Dallas for more than five years. Dr. Goldstein is a member of the
National Academy of Sciences. Drs. Goldstein and Brown jointly received the
Nobel Prize for Physiology or Medicine in 1985.

P. ROY VAGELOS, M.D., 70, has been Chairman of the Board of the Company, and a
member of the Scientific Advisory Board since January 1995. He became a
part-time employee of Regeneron in January 1999. Prior to joining Regeneron, Dr.
Vagelos was Chairman of the Board and Chief Executive Officer of Merck & Co.,
Inc. He joined Merck in 1975, became a director in 1984, President and Chief
Executive Officer in 1985, and Chairman in 1986. Dr. Vagelos retired from all
positions with Merck in 1994. Dr. Vagelos is President and Chief Executive
Officer and a Trustee of the American School of Classical Studies at Athens. He
is also currently a member of the Board of Directors of PepsiCo, Inc., The
Prudential Insurance Company of America, and Estee Lauder Companies.

- -------------------------------------------------------------------------------
Board Committees

The Company's Board of Directors has an Audit Committee of which Messrs. Baker,
Middleton, and Sing are members. The Audit Committee is responsible for
reviewing the Company's financial results, the scope and results of audits, and
the evaluation of the Company's system of internal controls. It also recommends
the appointment of independent accountants. The Audit Committee is comprised of
directors who are not officers or employees of Regeneron.

The Board of Directors has a Compensation Committee of which Messrs. Baker and
Sing are members. The Compensation Committee has responsibility for
administering and approving cash compensation of all corporate officers and of
other employees of the Company, and for the administration of the Company's
Executive Stock Purchase Plan, 1990 Long-Term Incentive Plan, and 2000 Long-Term
Incentive Plan. Members of this committee are directors who are not officers or
employees of Regeneron.

The Board of Directors also has a Technology Committee of which Drs. Brown,
Gilman, Goldstein, Shooter, and Vagelos are members. The Technology Committee
has the responsibility for reviewing the Company's scientific and medical
programs and policies. The Technology Committee members are also members of the
Regeneron Scientific Advisory Board.



                                       5
<PAGE>

During the last fiscal year, the Board of Directors held five meetings, the
Audit Committee held two meetings, the Compensation Committee held three
meetings, and the Technology Committee held four meetings. No director attended
fewer than 75 percent of the number of Board of Directors meetings and meetings
of committees on which he served.

- -------------------------------------------------------------------------------
Compensation of Directors

Nonemployee directors receive an annual retainer of $5,000 and a payment of
$2,000 for each Board meeting attended in person. No additional retainer is paid
for committee service. Directors who are not employees are reimbursed for their
actual expenses relating to their attendance at Board of Directors meetings. In
1999 the Company paid Dr. Shooter $15,000, and Drs. Brown, Gilman and Goldstein
$22,500 each as members of the Scientific Advisory Board.

Pursuant to the Company's 1990 Long-Term Incentive Plan, which expires in
2000, each member of the Board of Directors who was not at the time of grant
an employee of the Company or any subsidiary of the Company (an "Outside
Director") received an automatic grant of an option to purchase 10,000 shares of
Common Stock with an exercise price per share equal to the fair market value of
a share of Common Stock on the date of grant. The grant occurred on March 1 of
each year prior to the termination of the 1990 Long-Term Incentive Plan.
Pursuant to the 2000 Long-Term Incentive Plan (see "Description of Principle
Features of the 2000 Long-Term Incentive Plan"), each Outside Director will
receive an automatic grant of an option to purchase 15,000 shares of Common
Stock on January 1 of each year beginning January 1, 2001. Options so granted
under both the 1990 and 2000 Long-Term Incentive Plans are exercisable as to
one-third of the shares on the anniversary of the date of grant on each of the
three subsequent calendar years, and will expire ten years following the date of
grant. If prior to the option's expiration or exercise the grantee ceases to be
a voting member of the Board of Directors, then the portion of the option that
at that time is not exercisable will expire and the portion of the option, if
any, that is exercisable may be exercised during the three months after the
director ceases to be a voting member of the Board of Directors.

In accordance with an agreement dated as of January 8, 1995 between Dr. Vagelos
and the Company, Dr. Vagelos purchased 600,000 shares of Common Stock for
$300,000. He also received an option to purchase up to 285,000 shares of the
Company's Common Stock at the fair market value of the Common Stock as of the
date of grant, or $3.50 per share. On December 31, 1998, Dr. Vagelos entered
into a five-year employment agreement with Regeneron, pursuant to which,
effective January 1, 1999, he became a part-time employee. Dr. Vagelos did not
become an officer of Regeneron or change his title. His annual compensation as
an employee in 1999 was $100,000. In accordance with the employment agreement,
the Company in 1999 issued Dr. Vagelos an option, pursuant to the 1990 Long-Term
Incentive Plan, to purchase up to 162,500 shares of Regeneron Common Stock at an
exercise price of $7.41 per share; the option will vest over five years. In
addition, the Company agreed to recommend to the Compensation Committee that Dr.
Vagelos be granted additional stock option grants on or about January 1, 2000
through 2004 in the amount of the greater of (a) 125,000 shares or (b) 125% of
the highest annual option grant made to an officer of the Company at the time of
each respective year's annual grant to officers. On December 20, 1999, the
Company issued Dr. Vagelos an option, pursuant to the 1990 Long-Term Incentive
Plan, to purchase up to 187,500 shares of Regeneron Common Stock at an exercise
price of $8.77 per share; the option will vest over five years. If Dr. Vagelos
dies or is disabled while he is employed by Regeneron, all options granted by
Regeneron to him will immediately become exercisable at the time of death or
disability.


                                       6
<PAGE>

- -------------------------------------------------------------------------------
Executive Compensation

Set forth below is information concerning the annual and long-term compensation
for services performed during each of the last three fiscal years for
Regeneron's Chief Executive Officer and its five other highest-compensated
executive officers (the "Named Officers").

Summary Compensation Table

<TABLE>
<CAPTION>
                                              --------------------------------------------------------------------------------
                                                                                                     Long Term
                                                               Annual Compensation                 Compensation
                                                                                                      Awards
                                             ----------------------------------------------------------------------------------

                                                                                      Other        Securities
 Name and                                                                             Annual        Underlying       All Other
Principal Position                           Year        Salary       Bonus       Compensation       Options        Compensation (1)
- ------------------                           ----        ------       -----       ------------       -------        ------------
<S>                                          <C>        <C>           <C>           <C>           <C>                  <C>
Leonard S. Schleifer, M.D., Ph.D.            1999       $430,000      $120,000      $1,640        (4) 250,000          $4,800
  President and Chief                        1998        410,000       100,000       1,640            160,000           4,800
  Executive Officer                          1997        415,077       100,000       1,670             80,000               0

George D. Yancopoulos, M.D., Ph.D.           1999       $320,000             0           0        (4) 200,000          $4,800
  Senior Vice President, Research            1998        299,000             0           0                  0           4,800
  and Chief Scientific Officer               1997        269,448             0           0            130,000               0


Murray A. Goldberg                           1999       $223,000             0           0         (4) 80,000          $4,800
  Vice President, Finance &                  1998        210,000             0           0             30,000           4,800
  Administration, Treasurer, Assistant       1997        192,231             0           0             25,000               0
   Secretary and Chief Financial Officer

Paul Lubetkin (2)                            1999       $212,000             0           0        (4)  50,000               0
  Vice President, General                    1998        200,000             0           0             20,000          $4,800
  Counsel, and Secretary                     1997        196,823             0           0             20,000               0

Randall R. Rupp, Ph. D.                      1999       $209,000             0           0        (4)  70,000          $4,800
  Vice President, Manufacturing and          1998        195,000             0           0             30,000           4,650
  Process Science                            1997        185,885             0           0             20,000               0

Hans-Peter Guler, M.D.  (3)                  1999       $209,000             0           0        (4)  50,000          $4,800
   Vice President,                           1998        165,461             0           0             50,000               0
   Clinical Sciences

- ------------------
</TABLE>
(1)   Represents a matching Company contribution under the Regeneron
      Pharmaceuticals, Inc. 401(k) Savings Plan.

(2)   Mr. Lubetkin resigned from his position with the Company in January 2000.

(3)   Dr. Guler joined the Company in April 1998.

(4)   In 1999, eligible employees and officers received a stock option grant in
      January 1999 for performance in 1998 and a stock option grant in December
      1999 for performance in 1999. The Company plans to make future
      performance-based stock option grants in December of each year.


                                       7
<PAGE>

Options

All options to purchase Regeneron Common Stock granted to the Named Officers for
1999 and prior years have been granted under the Company's 1990 Long-Term
Incentive Plan. Set forth below is information about grants of options during
1999 to the Named Officers. No Restricted Share Rights, Stock Appreciation
Rights, Incentive Stock Rights, or Incentive Unit Rights have been granted by
the Company.

Options Granted in Last Fiscal Year
<TABLE>
<CAPTION>
                                                ----------------------------------------------------------------------------------
                                                                                                         Potential Realizable Value
                                                                                                           at Assumed Annual Rates
                                               Number of                                                       of Stock Price
                                              Securities         Percent of                                    Appreciation for
                                             Underlying    Total Options Granted   Exercise                       Option Term
                                                Options        to Employees         Price     Expiration
Name                                        Granted (#)(1)     In Fiscal Year     ($/Share)      Date         5% ($)      10%($)
- ----                                        -------------- --------------------   ---------   ----------    --------      -------
<S>                                               <C>                 <C>          <C>           <C>         <C>        <C>
Leonard S. Schleifer, M.D., Ph.D.                 26,990              1.3%          $7.410       1/04/09      35,283      102,126
                                                  73,010              3.6%          $7.410       1/04/09     340,235      862,221
                                                 150,000              7.3%          $8.770      12/20/09     827,311    2,096,568


George D. Yancopoulos, M.D., Ph.D.                26,991              1.3%          $7.410       1/04/09     125,781      318,754
                                                  73,009              3.6%          $7.410       1/04/09     340,230      862,209
                                                 100,000              4.9%          $8.770      12/20/09     551,541    1,397,712


Murray A. Goldberg                                14,612              0.7%          $7.410       1/04/09      68,094      172,562
                                                  25,388              1.2%          $7.410       1/04/09     118,311      299,823
                                                   4,811              0.2%          $8.770      12/20/09      26,534       67,244
                                                  35,189              1.7%          $8.770      12/20/09     194,081      491,840


Paul Lubetkin                                     18,551              0.9%          $7.410       1/04/09      86,450      219,080
                                                   6,449              0.3%          $7.410       1/04/09      30,053       76,160
                                                   8,244              0.4%          $8.770      12/20/09      45,469      115,227
                                                  16,756              0.8%          $8.770      12/20/09      92,416      234,201


Randall R. Rupp, Ph.D.                            16,149              0.8%          $7.410       1/04/09      75,256      190,714
                                                  13,851              0.7%          $7.410       1/04/09      64,547      163,575
                                                  40,000              2.0%          $8.770      12/20/09     220,616      559,085


Hans-Peter Guler, M.D.                            17,832              0.9%          $7.410       1/04/09      83,099      210,589
                                                   2,168              0.1%          $7.410       1/04/09      10,103       25,603
                                                  30,000              1.5%          $8.770      12/20/09     165,462      419,314

                                         ----------------------------------------------------------------------------------------
</TABLE>
      ---------------------

(1)   All options granted expire ten years from the date of grant and become
exercisable ratably over five years beginning one year from the date of
grant. In 1999, eligible employees and officers received a stock option grant in
January, 1999 for performance in 1998 and a stock option grant in December, 1999
for performance in 1999.  The Company plans to make future performance-based
stock option grants in December of each year.


                                       8
<PAGE>

Aggregated Option Exercises in Last Fiscal Year and Fiscal Year-End Option
Values

The following table shows information with respect to the Named Officers
concerning options exercised during 1999 and the value of stock options held as
of the end of 1999.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------------
                                                                        Number of Securities           Value of Unexercised
                                         Shares                        Underlying Unexercised              In-the-Money
                                      Acquired on      Value                 Options at                      Options at
Name                                   Exercise (#)  Realized ($)       Fiscal Year-End (#)            Fiscal Year-End ($) (1)
- --------------------------------------------------------------------------------------------------------------------------------
                                                                    Exercisable   Unexercisable      Exercisable  Unexercisable
                                                                    -----------   -------------      -----------  -------------
<S>                                     <C>           <C>           <C>           <C>                <C>          <C>
Leonard S. Schleifer, M.D., Ph.D.           0              0            240,000         490,000          101,541      1,837,488

George D. Yancopoulos, M.D., Ph.D.          0              0            404,250         288,000        2,963,252      1,085,580

Murray A. Goldberg                      4,000         15,240             64,000         143,000          265,020        589,020

Paul Lubetkin                               0              0             98,000          86,000          664,070        327,860

Randall R. Rupp, Ph.D.                      0              0            103,500         106,000          807,920        443,620

Hans-Peter Guler, M.D.                      0              0             10,000          90,000           51,820        426,980
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>
- ---------------
 (1) Based on the average of the high and low sales price of the Company's
Common Stock on December 31, 1999, as reported on the Nasdaq Stock Market, of
$12.62, less the exercise price.

- --------------------------------------------------------------------------------
Employment Agreements

On February 12, 1998, the Company entered into an employment agreement with
Leonard S. Schleifer, M.D., Ph.D., providing for his employment with the Company
through December 31, 2002. During the term of his employment, the Company will
pay Dr. Schleifer a base salary of $410,000 (retroactive to January 1, 1998),
with such increases as may be determined by the Compensation Committee and
approved by the Board of Directors. Under his employment agreement, Dr.
Schleifer may participate in all Company benefit and incentive programs. During
his employment term, the Company will maintain life insurance on Dr. Schleifer's
life in the amount of $1,000,000 payable to beneficiaries designated by Dr.
Schleifer. Also under the employment agreement, the Company has agreed that in
the event that Dr. Schleifer's employment is terminated other than for cause (as
defined in the agreement) or is terminated by Dr. Schleifer for good reason (as
defined in the agreement to include specified acts of constructive termination,
as well as the first year following a change in control of the Company)
(collectively, an "Involuntary Termination"), the Company will pay Dr. Schleifer
his base salary for 15 months, continue to provide Dr. Schleifer and his
dependents medical, dental, and life insurance for 18 months, and accelerate
certain otherwise unexercisable stock options granted to Dr. Schleifer. Upon an
Involuntary Termination within three years after a change in control of the
Company or within three months prior thereto, the Company will pay Dr. Schleifer
an amount equal to two times his base salary in effect, continue to provide Dr.
Schleifer and his dependents medical, dental, and life insurance for 24 months,
and accelerate certain otherwise unexercisable stock options granted to Dr.
Schleifer. Notwithstanding the foregoing, if payments resulting from the change
in ownership as defined in Section 280G(b)(2) of the Internal Revenue Code
exceed certain thresholds, the amounts and benefits provided under the
employment agreement will be automatically reduced to an amount that would not
subject Dr. Schleifer to the excise tax under Section 4999 of the Internal
Revenue Code or the Company to a loss of deductibility under Section 280G.

On March 6, 2000, the Company entered into an employment agreement with George
D. Yancopoulos, M.D., Ph.D.,  providing for his employment with the Company
through March 5, 2005. During the term of employment, the Company will pay Dr.
Yancopoulos an annual base salary of $370,000 with such increases as may be
determined by the Compensation Committee and approved by the Board of Directors.
Dr. Yancopoulos is also entitled to participate in all Company benefit plans and
incentive plans provided to similarly situated executives of the Company. The
employment agreement provides that in the event that Dr. Yancopoulos' employment
is terminated (i) by the Company without cause, as defined in the employment
agreement, (ii) by reason of the executive's death, or (iii) by reason of the
executive's disability, as determined in good faith by the Board, Dr.
Yancopoulos, or his estate as the case may be, will continue to be paid his base
salary and benefits payable under the agreement for the lesser of one year or
the remainder of the term of the agreement. Under the employment agreement, Dr.
Yancopoulos has agreed that he will not engage in activities which are in
competition with the Company for a period of one year following the termination
of his active employment with the Company.


                                       9
<PAGE>
For a description of the company's Employment agreement with P. Roy Vagelos,
M.D. see "Compensation of Directors".
- --------------------------------------------------------------------------------
Compensation Committee
Report on Executive Compensation

The Company's executive compensation program is administered by the Compensation
Committee, which is comprised of two directors. Subject to approval by the Board
of Directors, the Compensation Committee is responsible for (among other things)
determining the compensation package of each executive officer. The Compensation
Committee considers the views and recommendations of other directors, including
those of Dr. Schleifer, in making decisions regarding the compensation of the
Company's executive officers.

The Company's executive compensation program is designed to promote the
achievement of the Company's business objectives and, thereby, to maximize
long-term corporate performance and shareholder value. The compensation of the
executive officers consists of a combination of base salary, bonuses, and
long-term stock-based incentives through the Company's Long-Term Incentive Plan.
The Compensation Committee believes it is important for stock incentives to
constitute a significant portion of the compensation package in order to help
align executive and shareholder interests.

In determining the total amount and mixture of the compensation package for each
executive officer, including Dr. Schleifer and the other Named Officers, the
Compensation Committee and the Board consider numerous factors, the most
important of which are (i) the Company's needs and objectives, including
attracting, motivating, and retaining key management personnel, (ii) individual
performance, including the expected contribution to the Company's objectives of
each executive officer, (iii) compensation of persons holding comparable
positions, including data obtained from outside studies and proxy materials on
the payment of executive officers at comparable companies, as well as the
Company's most direct competitors, and (iv) the overall value to each executive
of his or her compensation package. No specific numerical weight is given to any
of these factors.

The 1999 base salaries of the Named Officers as a group (other than Dr.
Schleifer) increased by an average of 6.25 percent over 1998. These increases
were made in January 1999 and reflected the Committee's review in late 1998 of
individual performance and internal and outside compensation studies of
competitive and regional factors.

Dr. Schleifer's 1999 compensation package was based on the same factors as
described above for all executive officers pursuant to the Company's executive
compensation objectives. In 1999, Dr. Schleifer's base salary increased 4.88
percent over 1998. In addition, the Compensation Committee directed that Dr.
Schleifer be paid a bonus of $120,000 in 1999 based on his achievements in 1998.
The Compensation Committee considered, among other things, the clinical progress
of brain- derived neurotrophic factor and neurotrophin-3 during 1998, the
Company's progress in its preclinical programs, including its program aimed at
obesity and complications of obesity such a Type II diabetes, and other
significant accomplishments that occurred during 1998, including the progress of
several important collaborations with corporate partners. These achievements
were guided and managed by Dr. Schleifer and the Named Officers.

Section 162(m) of the Internal Revenue Code limits the deductibility of
compensation over $1 million to the Chief Executive Officer and the other Named
Officers unless certain conditions are met. The Company's Chief Executive
Officer and the other Named Officers have not received compensation over $1
million.

Charles A. Baker, Chairman
George L. Sing

- --------------------------------------------------------------------------------
Certain Relationships and Related Transactions

There is no information required to be disclosed by Item 404 of Regulation S-K
under the Securities Act of 1933. This Item requires disclosure of certain
transactions between Regeneron or a subsidiary of Regeneron and a director,
officer, or holder of five percent of any class of Regeneron voting securities
(or any member of the immediate family of the foregoing persons).


                                       10
<PAGE>

- -------------------------------------------------------------------------------
Performance Graph

Set forth below is a line graph comparing the cumulative total stockholder
return on the Company's Common Stock with the cumulative total return of (i) The
Nasdaq Pharmaceutical Stocks Index and (ii) The Nasdaq Stock Market (U.S.) Index
for the period from December 31, 1994 through December 31, 1999.

                                [OBJECT OMITTED]

<TABLE>
<CAPTION>
                           12/31/94      12/31/95       12/31/96      12/31/97    12/31/98    12/31/99
                          -----------  ------------  -------------  -----------  ----------  ----------
   <S>                       <C>           <C>           <C>          <C>         <C>         <C>
   Regeneron                 $100          $425          $ 521        $288        $234        $425
   Nasdaq Pharm               100           183            184         190         242         452
   Nasdaq-US                  100           141            174         213         300         542
</TABLE>

The above graph assumes $100 investments on December 31, 1994 in the Company's
Common Stock, The Nasdaq Pharmaceutical Stocks Index, and The Nasdaq Stock
Market (U.S.) Index, with all dividends reinvested.

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

Officers of the Registrant

All officers of the Company are appointed annually and serve at the pleasure of
the Board of Directors. The names, positions, ages, and background of the
Company's senior managers, are set forth below:

LEONARD S. SCHLEIFER, M.D., Ph.D., 47, founded the Company in 1988 and has been
its President and Chief Executive Officer since its inception and served as
Chairman of the Board from 1990 through 1994. In 1992, Dr. Schleifer was
appointed Clinical Professor of Neurology at the Cornell University Medical
School, and from 1984 to 1988 he was Assistant Professor at the Cornell
University Medical School in the Departments of Neurology and Neurobiology. Dr.
Schleifer received his M.D. and Ph.D. in Pharmacology from the University of
Virginia. Dr. Schleifer is a licensed physician and is certified in Neurology by
the American Board of Psychiatry and Neurology. Dr. Schleifer is a member of the
Board of Directors of the Biotechnology Industry Organization.

GEORGE D. YANCOPOULOS, M.D., Ph.D., 40, has been Senior Vice President, Research
since June 1997 and Chief Scientific Officer since January 1998. Dr. Yancopoulos
was Vice President, Discovery from January 1992 until June 1997, Head of
Discovery from January 1991 to January 1992 and Senior Staff Scientist from
March 1989 to January 1991. He received his Ph.D. in Biochemistry and Molecular
Biophysics and his M.D. from Columbia University.


                                       11
<PAGE>

JESSE M. CEDARBAUM, M.D., 48, has been Vice President, Clinical Affairs since
January 1993, and was Program Director of Clinical Affairs of the Company from
July 1990 until December 1992. He was Associate Professor of Neurology and
Neuroscience at Cornell University Medical College and director of the Parkinson
and Movement Disorders Clinics, New York Hospital and The Burke Rehabilitation
Center from 1983 to 1990 and is currently Clinical Associate Professor of
Neurology at Mt. Sinai Medical School in New York. Dr. Cedarbaum is a board
certified neurologist. Dr. Cedarbaum received his M.D. from the Yale University
School of Medicine.

MURRAY A. GOLDBERG, 55, has been Vice President, Finance & Administration,
Treasurer, and Chief Financial Officer since March 1995, and Assistant Secretary
since January 2000. Prior to joining the Company, Mr. Goldberg was Vice
President, Finance, Treasurer, and Chief Financial Officer of PharmaGenics, Inc.
from February 1991 and a Director of that company from May 1991. From 1987 to
1990, Mr. Goldberg was Managing Director, Structured Finance Group at the Chase
Manhattan Bank, N.A. and from 1973 to 1987 he served in various managerial
positions in finance and corporate development at American Cyanamid Company.

HANS-PETER GULER, M.D., 51, has been Vice President, Clinical Sciences since
April 1998. From 1994 until joining the Company, Dr. Guler was employed by
Chiron Corporation, most recently as Senior Director of Clinical Development.
From 1989 to 1994, he was Associate Director of Drug Development in the
Pharmaceuticals Divisions of CIBA-GEIGY Corporation. Dr. Guler received his M.D.
from the University of Zurich.

STEPHEN L. HOLST, 58, has been Vice President, Quality Assurance and Regulatory
Affairs since October 1997. From 1993 until October 1997, Mr. Holst was employed
by Novo Nordisk A/S, most recently as Senior Regulatory Officer and Responsible
Head of its worldwide Health Care group. From 1990 to 1993, he was Director of
Regeneron's Regulatory Affairs and Quality Assurance groups.

RICHARD X. HORNE, 49, has been Staff Vice President, Human Resources since
August 1998. Immediately prior to joining Regeneron, he was Vice President,
Human Resources at Braintree Hospital in Braintree, MA, serving in that capacity
since 1990. Mr. Horne also was a member of the Board of Directors of The
Rehabilitation Hospital of Rhode Island in North Smithfield, RI from October
1997 until April 1998.

WILLIAM G. ROBERTS, M.D., 42, has been Vice President, Regulatory Development
since May 1999. From 1993 until joining the Company, Dr. Roberts was employed by
Merck & Co., Inc., as Associate Director, Gastroenterology Clinical Research
and, subsequently, Director, Regulatory Affairs. He received his M.D. from the
Columbia University College of Physicians & Surgeons.

RANDALL G. RUPP, Ph.D., 53, has been Vice President, Manufacturing and Process
Science since January 1992, and was Director of Manufacturing from July 1991
until December 1992. He received his Ph.D. in Biomedical Sciences from the
University of Texas, M.D. Anderson Hospital and Tumor Institution, Houston.

JOSEPH M. SORRENTINO, Ph.D., 48, has been Vice President, Intellectual Property
since September 1999. Immediately before joining the Company, he was Vice
President and Counsel (Biotechnology Patents) at Bristol-Meyers Squibb Co.,
which he joined in 1990. Dr. Sorrentino received his Ph.D. in Biochemistry from
the University of Texas and his J.D. from the University of Arizona.

NEIL STAHL, Ph.D., 43 , has been Vice President, Preclinical Development and
Biomolecular Science since January 2000. He joined us in 1991. Before becoming
Vice President, Biomolecular Science in July 1997, Dr. Stahl was Director,
Cytokines and Signal Transduction. Dr. Stahl received his Ph.D. in Biochemistry
from Brandeis University.

DAVID VALENZUELA, Ph.D., 49, has been Vice President, Genomics and
Bioinformatics since January 1998. Dr. Valenzuela joined us in 1990. He received
his Ph.D. in Molecular Biology from the Albert Einstein College of Medicine,
Yeshiva University.

DOUGLAS S. McCORKLE, 43, has been Controller since May 1998 and Assistant
Treasurer since June 1998. Before joining the Company, Mr. McCorkle was the
Controller at Intergen Company from January 1997. He was a Manager from 1995 to
1996, Senior Associate from 1992 to 1995, and Associate from 1990 to 1991, with
PricewaterhouseCoopers LLP.

BEVERLY C. DUBS, 45, has been Administrative Controller since May 1998 and
Assistant Treasurer since August 1990. Ms. Dubs has served in various finance
and administration capacities at Regeneron since 1989.

- -------------------------------------------------------------------------------
PROPOSAL NO. 2: APPROVAL OF THE REGENERON PHARMACEUTICALS, INC. 2000 LONG-TERM
INCENTIVE PLAN

The Board of Directors Unanimously Recommends a Vote FOR the Approval of the
Adoption of the Regeneron Pharmaceuticals, Inc. 2000 Long-Term Incentive Plan.

On April 25, 2000, the Board of Directors adopted a new long-term incentive
plan, the Regeneron Pharmaceuticals, Inc. 2000 Long-Term Incentive Plan (the
"2000 Plan"), subject to shareholder approval. The 2000 Plan is intended to
replace the Regeneron Pharmaceuticals, Inc. 1990 Long-Term Incentive Plan, which
will expire during the year 2000 by its terms. The 2000 Plan is also intended to
qualify for the performance-based exclusion from the deduction limitation of
Section 162(m) of the Internal Revenue Code


                                       12
<PAGE>

(see "Compensation Committee Report on Executive Compensation" for a description
of Section 162(m)). One requirement of such exclusion is that an option plan
contain, and shareholders approve, a maximum number of shares that may be
awarded to any eligible employee. As indicated below under "Description of
Principal Features of the 2000 Long-Term Incentive Plan," no more than 1,000,000
shares may be subject to any award made to an eligible employee under the 2000
Plan (1,500,000 shares in an employee's initial year of employment).

The Board believes that shareholder approval of the 2000 Plan is necessary in
order for the Company to (i) continue to meet its objective of securing,
motivating and retaining qualified officers and employees, and of compensating
Nonemployee directors, and (ii) permit the qualification of the 2000 Plan for
the performance-based exclusion under Section 162(m). The principal features of
the 2000 Plan are described below. The full text of the 2000 Plan is attached to
this Proxy Statement as Exhibit A.

Description of Principal Features of the 2000 Plan

The 2000 Plan is administered by the Compensation Committee of the Board of
Directors (the "Committee"). Each member of the Committee is a "nonemployee
director" (within the meaning of Rule 16b-3 promulgated under Section 16 of the
Securities Exchange Act of 1934, as amended) and an "outside director" (within
the meaning of Section 162(m) of the Internal Revenue Code).

The 2000 Plan may be amended by the Board of Directors, subject to shareholder
approval where necessary to satisfy certain regulatory requirements. The 2000
Plan will terminate not later than the close of business on April 24, 2010.
However, awards granted before the termination of the 2000 Plan may extend
beyond that date in accordance with their terms.

There are generally four types of awards that may be granted under the 2000
Plan: Stock Options (including both incentive stock options ("ISOs") within the
meaning of Section 422 of the Internal Revenue Code and nonqualified stock
options ("NQSOs"), which are options that do not qualify as ISOs), Restricted
Stock, Phantom Stock, and Stock Bonus awards. In addition, the Committee in its
discretion may make other awards valued in whole or in part by reference to, or
otherwise based on, Common Stock.

There are reserved for issuance under the 2000 Plan a total of 6,000,000 shares
of Common Stock, generally subject to equitable adjustment upon the occurrence
of any stock dividend or other distribution, recapitalization, stock split,
subdivision reorganization, merger, consolidation, combination, repurchase, or
share exchange, or other similar corporate transaction or event. The maximum
number of shares of Common Stock that may be the subject of awards to a
participant in any year is 1,000,000, except that such number is 1,500,000 with
respect to an employee's initial year of employment with the Company.

Officers of the Company, including the Named Officers, employees, consultants
and Nonemployee directors of the Company are eligible to receive awards under
the 2000 Plan in the discretion of the Committee. To date, subject to
shareholder approval, one award in respect of 333,000 shares has been granted
under the 2000 Plan.

Awards will become exercisable or otherwise vest at the times and upon the
conditions that the Committee may determine, as reflected in the applicable
award agreement. The Committee has the authority to accelerate the vesting
and/or exercisability of any outstanding award at such times and under such
circumstances as it, in its sole discretion, deems appropriate (for instance,
upon a "Change in Control" of the Company, as defined in the 2000 Plan). Because
awards under the 2000 Plan are discretionary (other than annual grants to
Nonemployee directors described under "Nonemployee Director Awards" below), it
is not possible to determine the size of future awards.

Grants of stock options that were made to the Named Officers during the last
fiscal year (under the 1990 Long-Term Incentive Plan) are set forth above.
During the last fiscal year, stock options were granted as follows: to all
executive officers as a group, 1,352,000 and to all employees other than
executive officers, 690,345.

As of December 31, 1999, stock options in respect of 5,821,796 shares were held
by 470 employees and nonemployee service providers under the 1990 Long-Term
Incentive Plan at option prices averaging $8.29 per share and expiring during
the period from January 2001 to December 2009. No restricted stock grants,
phantom stock grants, or stock bonus awards are outstanding under the 2000 Plan,
which is subject to shareholder approval. The market price per share of Common
Stock on April 14, 2000 was approximately $18.22.

Stock Options. Options entitle the holder to purchase shares of Common Stock
during a specified period at a purchase price specified by the Committee (but in
the case of an ISO, at a price not less than 100% of the fair market value of
the Common Stock on the day the ISO is granted). Each Option granted under the
Plan will be exercisable for a period of 10 years from the date of grant, or
such lesser period as the Committee shall determine. Options may be exercised in
whole or in part, by the payment of cash of the full option price of the shares
purchased, by tendering shares of Common Stock with a fair market value equal to
the option price of the shares purchased, or by other methods in the discretion
of the Committee. The 2000 Plan provides that, unless otherwise determined by
the Committee, an Option shall vest with respect to 20% of the Option on the
first anniversary of the date of grant and with respect to an additional 20% on
each of the next four anniversaries thereof. Options that are exercisable as of
the date of a participant's termination of service with the Company may be
exercised after such date for the period set forth in the Option agreement or as
otherwise determined by the Committee. In the event of the death of a
participant, any unexercisable Options held by such participant shall become
fully exercisable by the participant's


                                       13
<PAGE>

heirs or personal representatives. Options held by a participant upon
termination from the Company's service for "Cause" (as defined in the 2000 Plan)
shall immediately expire (whether or not then exercisable). The Committee may
provide that a participant who delivers shares of Common Stock to exercise an
Option will automatically be granted new Options for the number of shares
delivered to exercise the Option ("Reload Options"). Reload Options will be
subject to the same terms and conditions as the related Option (except that the
exercise price generally will be the fair market value of the Common Stock on
the date the Reload Option is granted).

Restricted Stock. Restricted Stock awards consist of a grant of shares of
restricted Common Stock. The Committee may determine the price, if any, to be
paid by a participant for each share of Restricted Stock subject to an award. A
holder of Restricted Stock may vote and, if the participant remains in the
service of the Company throughout the "Restricted Period" as defined in the 2000
Plan (the "Restricted Period"), he or she may generally receive all dividends on
all such shares. However, such holder may not transfer such shares during the
Restricted Period. If for any reason during the Restricted Period a holder of
Restricted Stock ceases to be in the service of the Company, the holder may (and
if the termination is on account of "Cause" as defined in the 2000 Plan, shall)
be required to transfer to the Company such Restricted Stock together with any
dividends paid thereon. Consistent with Section 162(m) of the Internal Revenue
Code, the 2000 Plan provides that (i) restrictions on Restricted Stock may, in
the sole discretion of the Committee, lapse upon the achievement of certain
preestablished performance goals based upon the criteria described below, and
(ii) the maximum number of such performance based Restricted Stock awards that
may be granted to an employee in any year is 200,000.

The 2000 Plan provides that performance goals will be based on one or more of
the following criteria: (1) return on total shareholder equity; (2) earnings per
share of Common Stock; (3) net income (before or after taxes); (4) earnings
before interest, taxes, depreciation and amortization; (5) revenues; (6) return
on assets; (7) market share; (8) cost reduction goals; (9) any combination of,
or a specified increase in, any of the foregoing; (10) the achievement of
certain target levels of discovery and/or development of products, including,
without limitation, the regulatory approval of new products; (11) the
achievement of certain target levels of sales of new products or licensing in or
out of new drugs; (12) the formation of joint ventures, research or development
collaborations, or the completion of other corporate transactions; and (13) such
other criteria as the shareholders of the Company may approve. In addition, such
performance goals may be based upon the attainment of specified levels of
Company performance under one or more of the measures described above relative
to the performance of other corporations. To the extent permitted under Section
162(m) of the Internal Revenue Code (including, without limitation, compliance
with any requirements for shareholder approval), the Committee may designate
additional business criteria on which the performance goals may be based or
adjust, modify, or amend the aforementioned business criteria.

Phantom Stock. A Phantom Stock award is an award of the right to receive cash or
Common Stock at a future date, subject to such restrictions, if any, as the
Committee may impose at the date of grant or thereafter, which restrictions may
lapse separately or in combination at such times, under such circumstances
(including without limitation a specified period of employment or the
satisfaction of the performance goals described above), in such installments, or
otherwise, as the Committee may determine. The grant of a Phantom Stock award
shall not reduce the number of shares of Common Stock with respect to which
awards may be granted under the 2000 Plan.

Stock Bonus. If the Committee grants a Stock Bonus award, a certificate for the
shares of Common Stock constituting such Stock Bonus shall be issued in the name
of the participant to whom such grant was made and delivered to the participant
as soon as practicable after the date on which such Stock Bonus is payable.

Nonemployee Director Awards. On January 1 of each calendar year, each then
serving nonemployee director of the Company will be granted a NQSO to purchase
15,000 shares of Common Stock at the fair market value of such shares at the
time of grant; such NQSOs shall become exercisable as to 33-1/3% of the shares
covered thereby on each of the first, second, and third anniversaries of the
date of grant, and shall expire (if not earlier terminated) on the tenth
anniversary of the date of grant. An additional automatic grant in respect of
5,000 shares of Common Stock will be made to each then serving nonemployee
director on the date that the 2000 Plan is approved by shareholders.

Certain Federal Income Tax Consequences

Set forth below is a discussion of certain federal income tax consequences with
respect to Options that may be granted pursuant to the 2000 Plan. The following
discussion is a brief summary only, and reference is made to the Internal
Revenue Code and the regulations and interpretations issued thereunder for a
complete statement of all relevant federal tax consequences. This summary is not
intended to be exhaustive and does not describe state, local, or foreign tax
consequences of participation in the 2000 Plan.

Incentive Stock Options. In general, no taxable income is realized by a
participant upon the grant of an incentive stock option, within the meaning of
Section 422 of the Code. If shares of Common Stock are issued to a participant
("Option Shares") pursuant to the exercise of an ISO granted under the Plan and
the participant does not dispose of the Option Shares within the two-year period
after the date of grant or within one year after the receipt of such Option
Shares by the participant (a "disqualifying disposition"), then, generally (i)
the participant will not realize ordinary income upon exercise and (ii) upon
sale of such Option Shares, any amount realized in excess of the exercise price
paid for the Option Shares will be taxed to such


                                       14
<PAGE>

participant as capital gain (or loss). Long-term capital gain of a participant
is generally subject to a maximum tax rate of 20% in respect of property held
for more than one year. The amount by which the fair market value of the Common
Stock on the exercise date of an ISO exceeds the purchase price generally will
constitute an item which increases the participant's "alternative minimum
taxable income."

If Option Shares acquired upon the exercise of an ISO are disposed of in a
disqualifying disposition, the participant generally would include in ordinary
income in the year of disposition an amount equal to the excess of the fair
market value of the Option Shares at the time of exercise (or, if less, the
amount realized on the disposition of the Option Shares), over the exercise
price paid for the Option Shares.

Subject to certain exceptions, an ISO generally will not be treated as an ISO if
it is exercised more than three months following termination of employment. If
an ISO is exercised at a time when it no longer qualifies as an ISO, such option
will be treated as an NQSO as discussed below.

Nonqualified Stock Options. In general, no taxable income is realized by a
participant upon the grant of an NQSO. Upon exercise of an NQSO, the participant
generally would include in ordinary income at the time of exercise an amount
equal to the excess, if any, of the fair market value of the Option Shares at
the time of exercise over the exercise price paid for the Option Shares.

In the event of a subsequent sale of Option Shares received upon the exercise of
an NQSO, any appreciation or depreciation after the date on which taxable income
is realized by the participant in respect of the option exercise should be taxed
as capital gain in an amount equal to the excess of the sales proceeds for the
Option Shares over the participant's basis in such Option Shares. The
participant's basis in the Option Shares will generally equal the amount paid
for the Option Shares plus the amount included in ordinary income by the
participant upon exercise of the nonqualified option described in the
immediately preceding paragraph.

- -------------------------------------------------------------------------------
PROPOSAL NO. 3: RATIFICATION OF APPOINTMENT OF INDEPENDENT ACCOUNTANTS

The Board of Directors Unanimously Recommends a Vote FOR the Approval of
PricewaterhouseCoopers LLP.

The Board of Directors, at the recommendation of the Audit Committee, has
selected PricewaterhouseCoopers LLP as the Company's independent accountants for
the fiscal year ending December 31, 2000. This appointment is subject to the
approval of the Company's shareholders. Accordingly, the following resolution
will be offered at the Annual Meeting:

"RESOLVED, that the appointment, by the Board of Directors of Regeneron
Pharmaceuticals, Inc., of PricewaterhouseCoopers LLP as the independent
accountants of the Company for the year ending December 31, 2000 is hereby
approved."

PricewaterhouseCoopers LLP has been the Company's independent accountants for
the past eleven years and has advised the Company that it will have in
attendance at the Annual Meeting a representative who will be afforded an
opportunity to make a statement, if such representative desires to do so, and
will respond to appropriate questions presented at the Annual Meeting.

Proxies solicited by management will be voted "FOR" ratification of the
selection of PricewaterhouseCoopers LLP as independent accountants unless
shareholders indicate in their proxies their desire to have their shares voted
"AGAINST" such ratification.

- -------------------------------------------------------------------------------
Other Matters

The Board of Directors of the Company does not intend to present any other items
of business and knows of no other items of business that are likely to be
brought before the Annual Meeting, except those set forth in the accompanying
Notice of the Annual Meeting of Shareholders. However, if any other matters
should properly come before the Annual Meeting, the persons named in the
enclosed proxy will have discretionary authority to vote such proxy on such
matters in accordance with their best judgment.

- -------------------------------------------------------------------------------
Shareholder Proposals for 2001
Annual Meeting of Shareholders

A shareholder wishing to present a proposal at the 2001 Annual Meeting of
Shareholders must submit the proposal in writing and be received by the Company
at its principal executive offices (777 Old Saw Mill River Road, Tarrytown, New
York 10591) by January 5, 2001 in order for such proposal to be considered for
inclusion in the Company's proxy statement and form of proxy relating to that
meeting.

- -------------------------------------------------------------------------------
Cost of Solicitation

This solicitation is made on behalf of the Board of Directors of the Company.
The cost of solicitation of proxies in the accompanying form will be paid by the
Company. The Company will also, pursuant to regulations of the Securities and
Exchange Commission, make arrangements with brokerage houses and other
custodians, nominees, and fiduciaries to send proxies and proxy materials to
their principals and will reimburse them for their reasonable expenses in so
doing. In addition to solicitation by use of the mails, certain directors,
officers, and employees of the Company may solicit the return of proxies by
telephone, telegram, or personal interviews.

By Order of the Board of Directors,

Murray A. Goldberg
Assistant Secretary
Tarrytown, New York
May 8, 2000


                                       15
<PAGE>
                                                                      Exhibit A

                         REGENERON PHARMACEUTICALS, INC.
                          2000 LONG-TERM INCENTIVE PLAN

1.    Purpose; Establishment

      The Regeneron Pharmaceuticals, Inc. 2000 Long-Term Incentive Plan (the
"Plan") is intended to promote the interests of the Company (as defined below)
and its shareholders by providing officers and other employees of the Company
(including directors who are also employees of the Company) with appropriate
incentives and rewards to encourage them to enter into and continue in the
employ of the Company and to acquire a proprietary interest in the long-term
success of the Company; to compensate the Company's Nonemployee directors and
provide incentives to such Nonemployee directors that are directly linked to
increases in stock value; and to reward the performance of individual officers,
other employees, consultants and Nonemployee directors in fulfilling their
personal responsibilities for long-range achievements.

      The Plan was adopted and approved by the Board of Directors (defined
below) on April 25, 2000 and shall become effective as of such date, subject to
the approval of the shareholders of the Company.

2.    Definitions

      As used in the Plan, the following definitions apply to the terms
indicated below:

      (a)   "Affiliate" means any entity if, at the time of granting of an Award
            (A) the Company, directly or indirectly, owns at least 50% of the
            combined voting power of all classes of stock of such entity or at
            least 50% of the ownership interests in such entity or (B) such
            entity, directly or indirectly, owns at least 50% of the combined
            voting power of all classes of stock of the Company.

      (b)   "Agreement" shall mean the written agreement between the Company and
            a Participant evidencing an Award.

      (c)   "Award" shall mean any Option, Restricted Stock, Phantom Stock,
            Stock Bonus or Other Award granted pursuant to the terms of the
            Plan.

      (d)   "Board of Directors" shall mean the Board of Directors of Regeneron
            Pharmaceuticals, Inc.

      (e)   A "Change in Control" shall be deemed to have occurred if the event
            set forth in any one of the following paragraphs shall have
            occurred:

            (1)   any Person is or becomes the "Beneficial Owner" (as defined in
                  Rule 13d-3 under the Exchange Act), directly or indirectly, of
                  securities of the Company (not including in the securities
                  Beneficially Owned by such Person any securities acquired
                  directly from the Company) representing 20% or more of the
                  Company's then outstanding securities, excluding any Person
                  who is an officer or director of the Company or who becomes
                  such a Beneficial Owner in connection with a transaction
                  described in clause (A) of paragraph (3) below; or

            (2)   the following individuals cease for any reason to constitute a
                  majority of the number of directors then serving: individuals
                  who, on the Effective Date, constitute the Board of Directors
                  and any new director (other than a director whose initial
                  assumption of office is in connection with an actual or
                  threatened election contest, including but not limited to a
                  consent solicitation, relating to the election of directors of
                  the Company) whose appointment or election by the Board of
                  Directors or nomination for election by the Company's
                  shareholders was approved or recommended by a vote of at least
                  two-thirds (2/3) of the directors then still in office who
                  either were directors on the Effective Date or whose
                  appointment, election or nomination for election was
                  previously so approved or recommended; or


                                      A-1
<PAGE>

            (3)   there is consummated a merger or consolidation of the Company
                  with any other corporation other than (A) a merger or
                  consolidation which would result in the voting securities of
                  the Company outstanding immediately prior to such merger or
                  consolidation continuing to represent (either by remaining
                  outstanding or by being converted into voting securities of
                  the surviving entity or any parent thereof) at least 60% of
                  the combined voting power of the voting securities of the
                  Company or such surviving entity or any parent thereof
                  outstanding immediately after such merger or consolidation, or
                  (B) a merger or consolidation effected to implement a
                  recapitalization of the Company (or similar transaction) in
                  which no Person is or becomes the Beneficial Owner, directly
                  or indirectly, of securities of the Company (not including in
                  the securities Beneficially Owned by such Person any
                  securities acquired directly from the Company) representing
                  20% or more of the combined voting power of the Company's then
                  outstanding securities; or

            (4)   the shareholders of the Company approve a plan of complete
                  liquidation or dissolution of the Company or there is
                  consummated an agreement for the sale or disposition by the
                  Company of all or substantially all of the Company's assets,
                  other than a sale or disposition by the Company of all or
                  substantially all of the Company's assets to an entity at
                  least 75% of the combined voting power of the voting
                  securities of which are owned by Persons in substantially the
                  same proportions as their ownership of the Company immediately
                  prior to such sale.

      (f)   "Code" shall mean the Internal Revenue Code of 1986, as amended from
            time to time, and any regulations promulgated thereunder.

      (g)   "Committee" shall mean, at the discretion of the Board of Directors,
            the full Board of Directors or a committee of the Board of
            Directors, which shall consist of two or more persons, each of whom,
            unless otherwise determined by the Board of Directors, is an
            "outside director" within the meaning of Section 162(m) of the Code
            and a "Nonemployee director" within the meaning of Rule 16b-3.

      (h)   "Company" shall mean Regeneron Pharmaceuticals, Inc., a New York
            corporation, and, where appropriate, each of its Affiliates.

      (i)   "Company Stock" shall mean the common stock of the Company, par
            value $.001 per share.

      (j)   "Covered Employee" shall have the meaning set forth in Section
            162(m) of the Code.

      (k)   "Effective Date" shall mean April 25, 2000.

      (l)   "Exchange Act" shall mean the Securities Exchange Act of 1934, as
            amended from time to time.

      (m)   The "Fair Market Value" of a share of Company Stock, as of a date of
            determination, shall mean (1) the average of the high and low sales
            price per share of Company Stock on the national securities exchange
            or national market system on which such stock is principally traded
            on such date or, if such date is not a trading day, on the last
            preceding date on which there was a sale of such stock on such
            exchange, or (2) if the shares of Company Stock are not then listed
            on a national securities exchange or national market system, or the
            value of such shares is not otherwise determinable, such value as
            determined by the Committee in good faith.

      (n)   "Incentive Stock Option" shall mean an Option that is an "incentive
            stock option" within the meaning of Section 422 of the Code, or any
            successor provision, and that is designated by the Committee as an
            Incentive Stock Option.

      (o)   "Nonemployee Director" shall mean a member of the Board of Directors
            who is not an employee of the Company.

      (p)   "Nonqualified Stock Option" shall mean an Option other than an
            Incentive Stock Option.


                                      A-2
<PAGE>

      (q)   "Option" shall mean an option to purchase shares of Company Stock
            granted pursuant to Section 7 (or, with respect to a Nonemployee
            Director, pursuant to Section 12 hereof).

      (r)   "Other Award" shall mean an award granted pursuant to Section 11
            hereof.

      (s)   "Participant" shall mean an employee or consultant of the Company to
            whom an Award is granted pursuant to the Plan, or upon the death of
            the employee or consultant, his or her successors, heirs, executors
            and administrators, as the case may be.

      (t)   "Person" shall have the meaning set forth in Section 3(a)(9) of the
            Exchange Act, as modified and used in Sections 13(d) and 14(d)
            thereof, except that such term shall not include (1) the Company,
            (2) a trustee or other fiduciary holding securities under an
            employee benefit plan of the Company, (3) an underwriter temporarily
            holding securities pursuant to an offering of such securities, or
            (4) a corporation owned, directly or indirectly, by the shareholders
            of the Company in substantially the same proportions as their
            ownership of stock of the Company.

      (u)   "Phantom Stock" shall mean the right, granted pursuant to Section 9,
            to receive in cash or shares the Fair Market Value of a share of
            Company Stock.

      (v)   "Reload Option" shall mean a Nonqualified Stock Option granted
            pursuant to Section 7(c)(5).

      (w)   "Restricted Stock" shall mean a share of Company Stock which is
            granted pursuant to the terms of Section 8 hereof and which is
            subject to the restrictions set forth in Section 8(d).

      (x)   "Rule 16b-3" shall mean the Rule 16b-3 promulgated under the
            Exchange Act, as amended from time to time.

      (y)   "Securities Act" shall mean the Securities Act of 1933, as amended
            from time to time.

      (z)   "Stock Bonus" shall mean a bonus payable in shares of Company Stock
            granted pursuant to Section 10.

      (aa)  "Subsidiary" shall mean a "subsidiary corporation" within the
            meaning of Section 424(f) of the Code.

      (bb)  "Vesting Date" shall mean the date established by the Committee on
            which a share of Restricted Stock or Phantom Stock may vest.

3.    Stock Subject to the Plan

      (a)   Shares Available for Awards

            The maximum number of shares of Company Stock reserved for issuance
            under the Plan shall be 6,000,000 shares (subject to adjustment as
            provided herein). Such shares may be authorized but unissued Company
            Stock or authorized and issued Company Stock held in the Company's
            treasury. The Committee may direct that any stock certificate
            evidencing shares issued pursuant to the Plan shall bear a legend
            setting forth such restrictions on transferability as may apply to
            such shares pursuant to the Plan. The grant of Phantom Stock shall
            not reduce the number of shares of Company Stock with respect to
            which Awards may be granted pursuant to the Plan.

      (b)   Individual Limitation

            To the extent required by Section 162(m) of the Code, the total
            number of shares of Company Stock subject to Awards (including
            Awards which may be payable in cash but denominated as shares of
            Company Stock, i.e., Phantom Stock), awarded to any employee shall
            not exceed 1,500,000 shares during any tax year of the Company in
            which the employee first becomes employed by the Company or a
            Subsidiary, or 1,000,000 shares in any other tax year of the Company
            (in each case subject to adjustment as provided herein). In
            addition, for any tax year of the Company, the maximum number of
            shares of Restricted Stock that may be granted to a Covered Employee
            for which the lapse of the


                                      A-3
<PAGE>

            restrictions of Section 8(d) is subject to the attainment of
            preestablished performance goals in accordance with Section 8(j)
            shall not exceed 200,000 (subject to adjustment as provided herein).

      (c)   Adjustment for Change in Capitalization

            In the event that any dividend or other distribution is declared
            (whether in the form of cash, Company Stock, or other property), or
            there occurs any recapitalization, Company Stock split, reverse
            Company Stock split, reorganization, merger, consolidation,
            spin-off, combination, repurchase, or share exchange, or other
            similar corporate transaction or event, unless the Committee
            determines that it is otherwise inappropriate, (1) the number and
            kind of shares of Company Stock which may thereafter be issued in
            connection with Awards, (2) the number and kind of shares of Company
            Stock issued or issuable in respect of outstanding Awards, (3) the
            exercise price, grant price or purchase price relating to any Award,
            and (4) the maximum number of shares subject to Awards which may be
            awarded to any employee during any tax year of the Company shall be
            equitably adjusted as necessary to prevent the dilution or
            enlargement of the rights of Participants and Nonemployee Directors
            without change in the aggregate purchase price; provided that, with
            respect to Incentive Stock Options, such adjustment shall be made in
            accordance with Section 424 of the Code.

      (d)   Adjustment for Change or Exchange of Shares for Other Consideration

            In the event the outstanding shares of Company Stock shall be
            changed into or exchanged for any other class or series of capital
            stock or cash, securities or other property pursuant to a
            recapitalization, reclassification, merger, consolidation,
            combination or similar transaction ("Transaction"), then, unless
            otherwise determined by the Committee in its sole and absolute
            discretion, (1) each Option shall thereafter become exercisable for
            the number and/or kind of capital stock, and/or the amount of cash,
            securities or other property so distributed, into which the shares
            of Company Stock subject to the Option would have been changed or
            exchanged had the Option been exercised in full prior to such
            transaction, provided that, if the kind or amount of capital stock
            or cash, securities or other property received in such transaction
            is not the same for each outstanding share, then the kind or amount
            of capital stock or cash, securities or other property for which the
            Option shall thereafter become exercisable (or the other Award shall
            thereafter represent) shall be the kind and amount so receivable per
            share by a plurality of the shares of Company Stock, and provided
            further that, if necessary, the provisions of the Option shall be
            appropriately adjusted so as to be applicable, as nearly as may
            reasonably be, to any shares of capital stock, cash, securities or
            other property thereafter issuable or deliverable upon exercise of
            the Option, and (2) each Award that is not an Option and that is not
            automatically changed in connection with the Transaction shall
            represent the number and/or kind of shares of capital stock, and/or
            the amount of cash, securities or other property so distributed,
            into which the number of shares of Company Stock covered by the
            Award would have been changed or exchanged had they been held by a
            shareholder of the Company.

      (e)   Reuse of Shares

            The following shares of Company Stock shall again become available
            for Awards: (1) any shares subject to an Award that remain unissued
            upon the cancellation, surrender, exchange or termination of such
            award for any reason whatsoever and any shares of Restricted Stock
            forfeited, and (2) any previously owned or withheld shares of
            Company Stock obtained by the Participant pursuant to an Option
            exercise and received by the Company in exchange for Option shares
            upon a Participant's exercise of an Option, as permitted under
            Section 7(c)(3) hereof.

4.    Administration of the Plan

      The Plan shall be administered by the Committee. The Committee shall have
the authority in its sole discretion, subject to and not inconsistent with the
express provisions of the Plan, to administer the Plan and to exercise all the
powers and authorities either specifically granted to it under the Plan or
necessary or advisable in the administration of the Plan, including, without
limitation, the authority to grant Awards; to determine the persons to whom and
the time or times at which Awards shall be granted; to determine the type and
number of Awards to be granted, the number of shares of Stock to which an Award
may relate and the terms, conditions, restrictions and performance criteria
relating to any Award; to determine whether, to what extent, and under what
circumstances an Award may be settled, canceled, forfeited, exchanged, or
surrendered; to make adjustments in the performance goals in recognition of
unusual or


                                      A-4
<PAGE>

nonrecurring events affecting the Company or the financial statements of the
Company (to the extent not inconsistent with Section 162(m) of the Code, if
applicable), or in response to changes in applicable laws, regulations, or
accounting principles; to construe and interpret the Plan and any Award; to
prescribe, amend and rescind rules and regulations relating to the Plan; to
determine the terms and provisions of Agreements; and to make all other
determinations deemed necessary or advisable for the administration of the Plan.

      The Committee may, in its sole and absolute discretion, without amendment
to the Plan, (a) accelerate the date on which any Option granted under the Plan
becomes exercisable, waive or amend the operation of Plan provisions respecting
exercise after termination of employment or otherwise adjust any of the terms of
such Option, and (b) accelerate the Vesting Date, or waive any condition imposed
hereunder, with respect to any share of Restricted Stock, Phantom Stock or other
Award or otherwise adjust any of the terms applicable to any such Award.

5.    Eligibility

      The persons who shall be eligible to receive Awards pursuant to the Plan
shall be such employees of the Company (including officers of the Company,
whether or not they are directors of the Company) and Nonemployee service
providers and consultants, in each case as the Committee shall select from time
to time. Nonqualified Stock Options shall be granted to Nonemployee Directors in
accordance with the provisions of Section 12 hereof. The grant of an Award
hereunder in any year to any employee, service provider or consultant shall not
entitle such person to a grant of an Award in any future year.

6.    Awards Under the Plan; Agreement

      The Committee may grant Options, shares of Restricted Stock, shares of
Phantom Stock, Stock Bonuses and Other Awards in such amounts and with such
terms and conditions as the Committee shall determine, subject to the provisions
of the Plan. Nonqualified Stock Options shall be granted to Nonemployee
Directors in accordance with Section 12 hereof.

      Each Award granted under the Plan (except an unconditional Stock Bonus)
shall be evidenced by an Agreement which shall contain such provisions as the
Committee may in its sole discretion deem necessary or desirable which are not
in conflict with the terms of the Plan. By accepting an Award, a Participant
thereby agrees that the award shall be subject to all of the terms and
provisions of the Plan and the applicable Agreement.

7.    Options

      (a)   Identification of Options

            Each Option shall be clearly identified in the applicable Agreement
            as either an Incentive Stock Option or a Nonqualified Stock Option.

      (b)   Exercise Price

            Each Agreement with respect to an Option shall set forth the amount
            (the "option exercise price") payable by the grantee to the Company
            upon exercise of the Option. The option exercise price per share
            shall be determined by the Committee; provided, however, that in the
            case of an Incentive Stock Option, the option exercise price shall
            in no event be less than the Fair Market Value of a share of Company
            Stock on the date the Option is granted.

      (c)   Term and Exercise of Options

            (1)   Unless the applicable Agreement provides otherwise, an Option
                  shall become cumulatively exercisable as to 20% of the shares
                  covered thereby on each of the first, second, third, fourth,
                  and fifth anniversaries of the date of grant. The Committee
                  shall determine the expiration date of each Option; provided,
                  however, that no Incentive Stock Option shall be exercisable
                  more than ten (10) years after the date of grant.


                                      A-5
<PAGE>

            (2)   To the extent that an Option to purchase shares is not
                  exercised by a Participant when it becomes initially
                  exercisable, it shall not expire but carry forward and shall
                  be exercisable until its expiration or as provided by Section
                  7(e) hereof. If any Option is exercisable in the amount of one
                  hundred (100) or more full shares of Company Stock, the
                  Company shall not be obligated to permit the partial exercise
                  of such exercisable Option for less than one hundred (100)
                  full shares.

            (3)   An Option shall be exercised by delivering notice as specified
                  in the Agreement on the form of notice provided by the
                  Company. Payment for shares of Company Stock purchased upon
                  the exercise of an Option shall be made on the effective date
                  of such exercise by one or a combination of the following
                  means: (A) in cash or by personal check, certified check, bank
                  cashier's check or wire transfer; (B) in shares of Company
                  Stock owned by the Participant for at least six months prior
                  to the date of exercise and valued at their Fair Market Value
                  on the effective date of such exercise; or (C) by any such
                  other methods as the Committee may from time to time
                  authorize. In the case of a Participant or Nonemployee
                  Director who is subject to Section 16 of the Exchange Act, the
                  Company may require that the method of making such payment be
                  in compliance with Section 16 and the rules and regulations
                  thereunder. Any payment in shares of Company Stock shall be
                  effected by the delivery of such shares to the Secretary of
                  the Company, duly endorsed in blank or accompanied by stock
                  powers duly executed in blank, together with any other
                  documents and evidences as the Secretary of the Company shall
                  require.

            (4)   Certificates for shares of Company Stock purchased upon the
                  exercise of an Option shall be issued in the name of or for
                  the account of the Participant, Nonemployee Director or other
                  person entitled to receive such shares, and delivered to the
                  Participant, Nonemployee Director or such other person as soon
                  as practicable following the effective date on which the
                  Option is exercised.

            (5)   The Committee shall have the authority to specify, at the time
                  of grant or, with respect to Nonqualified Stock Options, at or
                  after the time of grant, that a Participant shall be granted a
                  new Nonqualified Stock Option (a "Reload Option") for a number
                  of shares equal to the number of shares surrendered by the
                  Participant upon exercise of all or a part of an Option in the
                  manner described in Section 7(c)(3)(B) above, subject to the
                  availability of shares of Company Stock under the Plan at the
                  time of such exercise. Reload Options shall be subject to such
                  conditions as may be specified by the Committee in its
                  discretion, subject to the terms of the Plan.

      (d)   Limitations on Incentive Stock Options

            (1)   The exercise price per share of Company Stock deliverable upon
                  the exercise of an Incentive Stock Option shall be not less
                  than the Fair Market Value of a share of Company Stock on the
                  date of grant.

            (2)   To the extent that the aggregate Fair Market Value of shares
                  of Company Stock with respect to which Incentive Stock Options
                  are exercisable for the first time by a Participant during any
                  calendar year under the Plan and any other stock option plan
                  of the Company or a Subsidiary shall exceed $100,000, such
                  Options shall be treated as Nonqualified Stock Options. Such
                  Fair Market Value shall be determined as of the date on which
                  each such Incentive Stock Option is granted.

            (3)   No Incentive Stock Option may be granted to an individual if,
                  at the time of the proposed grant, such individual owns (or is
                  deemed to own under the Code) stock possessing more than ten
                  percent of the total combined voting power of all classes of
                  stock of the Company unless (A) the exercise price of such
                  Incentive Stock Option is at least 110% of the Fair Market
                  Value of a share of Company Stock at the time such Incentive
                  Stock Option is granted, and (B) such Incentive Stock Option
                  is not exercisable after the expiration of five years from the
                  date such Incentive Stock Option is granted.


                                      A-6
<PAGE>

      (e)   Effect of Termination of Employment

            (1)   In the event that the employment of a Participant with the
                  Company shall terminate for any reason other than (A) Cause,
                  as defined in the Agreement, or (B) death, the Options granted
                  to such Participant, to the extent that they are exercisable
                  at the time of such termination, shall remain exercisable for
                  such period as may be provided in the Agreement (or as may be
                  provided by the Committee), but in no event following the
                  expiration of its term. The treatment of any Option that
                  remains unexercisable as of the date of termination shall be
                  as set forth in the Agreement (or as may be otherwise
                  determined by the Committee).

            (2)   In the event that the employment of a Participant with the
                  Company shall terminate on account of the death of the
                  Participant, all Options granted to such Participant that
                  remain outstanding as of the date of death, shall become fully
                  exercisable and shall remain exercisable by the Participant's
                  legal representatives, heirs or legatees for such period as
                  may be provided in the Agreement (or as otherwise may be
                  determined by the Committee), but in no event following the
                  expiration of its term. Cessation of active employment or
                  service due to commencement of long-term disability as
                  determined by the Committee shall not be deemed to constitute
                  a termination of employment or service for purposes of the
                  Plan, and during the continuance of such long-term disability
                  the individual shall be deemed to continue active employment
                  or service with the Company; provided, however, that the
                  Committee may in its sole discretion determine that a
                  Participant's long-term disability constitutes a permanent
                  disability and may deem such permanent disability to be a
                  termination of employment or service for any or all purposes
                  under this Plan.

            (3)   In the event of the termination of a Participant's employment
                  for Cause, as defined in the Agreement, all outstanding
                  Options granted to such Participant shall expire at the
                  commencement of business on the date of such termination.

      (f)   Acceleration of Exercise Date Upon Change in Control

            The Committee in its sole and absolute discretion may provide,
            either at the time of grant as provided in the Agreement or
            thereafter, that upon the occurrence of a Change in Control, an
            Option granted under the Plan and outstanding at such time shall (1)
            become immediately exercisable in whole or in part (in which case
            the Committee shall determine the period during which such Option
            shall remain exercisable), and/or (2) be canceled in exchange for
            the right to receive property equivalent in value to such Option, as
            determined by the Committee.

      (g)   Leave of Absence

            In the case of any Participant on an approved leave of absence, the
            Committee may make such provision respecting the continuance of the
            Option while in the employ or service of the Company as it may deem
            equitable, except that in no event may an Option be exercised after
            its expiration.

8.    Restricted Stock

      (a)   Price

            At the time of the grant of shares of Restricted Stock, the
            Committee shall determine the price, if any, to be paid by the
            Participant for each share of Restricted Stock subject to the Award.

      (b)   Vesting Date

            At the time of the grant of shares of Restricted Stock, the
            Committee shall establish a Vesting Date or Vesting Dates with
            respect to such shares. The Committee may divide such shares into
            classes and assign a different Vesting Date for each class. Provided
            that all conditions to the vesting of a share of Restricted Stock
            imposed pursuant to Section 8(c) are satisfied, and except as
            provided in Section 8(h), upon the occurrence of the Vesting Date
            with respect to a share of Restricted Stock, such share shall vest
            and the restrictions of Section 8(d) shall lapse.


                                      A-7
<PAGE>

      (c)   Conditions to Vesting

            At the time of the grant of shares of Restricted Stock, the
            Committee may impose such restrictions or conditions to the vesting
            of such shares as it, in its absolute discretion, deems appropriate.

      (d)   Restrictions on Transfer Prior to Vesting

            Prior to the vesting of a share of Restricted Stock, no transfer of
            a Participant's rights with respect to such share, whether voluntary
            or involuntary, by operation of law or otherwise, shall be
            permitted. Immediately upon any attempt to transfer such rights,
            such share, and all of the rights related thereto, shall be
            forfeited by the Participant.

      (e)   Dividends on Restricted Stock

            The Committee in its discretion may require that any dividends paid
            on shares of Restricted Stock be held in escrow until all
            restrictions on such shares have lapsed.

      (f)   Issuance of Certificates

            (1)   Reasonably promptly after the date of grant with respect to
                  shares of Restricted Stock, the Company shall cause to be
                  issued a stock certificate, registered in the name of or for
                  the account of the Participant to whom such shares were
                  granted, evidencing such shares. Each such stock certificate
                  shall bear the following legend:

                        The transferability of this certificate and the shares
                        of stock represented hereby are subject to the
                        restrictions, terms and conditions (including forfeiture
                        provisions and restrictions against transfer) contained
                        in the Regeneron Pharmaceuticals, Inc. 2000 Long Term
                        Incentive Plan and an Agreement entered into between the
                        registered owner of such shares and the Company. A copy
                        of the Plan and Agreement is on file in the office of
                        the Secretary of the Company, 777 Old Saw Mill River
                        Road, Tarrytown, New York 10591-6707.

                  Such legend shall not be removed until such shares vest
                  pursuant to the terms hereof.

            (2)   Each certificate issued pursuant to this Section 8(f),
                  together with the stock powers relating to the shares of
                  Restricted Stock evidenced by such certificate, shall be held
                  by the Company unless the Committee determines otherwise.

      (g)   Consequences of Vesting

            Upon the vesting of a share of Restricted Stock pursuant to the
            terms hereof, the restrictions of Section 8(d) shall lapse with
            respect to such share. Reasonably promptly after a share of
            Restricted Stock vests, the Company shall cause to be delivered to
            the Participant to whom such shares were granted, a certificate
            evidencing such share, free of the legend set forth in Section 8(f).

      (h)   Effect of Termination of Employment

            (1)   Except as the Committee in its sole and absolute discretion
                  may otherwise provide in the applicable Agreement, and subject
                  to the Committee's amendment authority pursuant to Section 4,
                  upon the termination of a Participant's employment for any
                  reason other than Cause, any and all shares to which
                  restrictions on transferability apply shall be immediately
                  forfeited by the Participant and transferred to, and
                  reacquired by, the Company; provided that if the Committee, in
                  its sole and absolute discretion, shall within thirty (30)
                  days after such

                                      A-8
<PAGE>

                  termination of employment notify the Participant in writing of
                  its decision not to terminate the Participant's rights in such
                  shares, then the Participant shall continue to be the owner of
                  such shares subject to such continuing restrictions as the
                  Committee may prescribe in such notice. In the event of a
                  forfeiture of shares pursuant to this section, the Company
                  shall repay to the Participant (or the Participant's estate)
                  any amount paid by the Participant for such shares. In the
                  event that the Company requires a return of shares, it shall
                  also have the right to require the return of all dividends
                  paid on such shares, whether by termination of any escrow
                  arrangement under which such dividends are held or otherwise.

            (2)   In the event of the termination of a Participant's employment
                  for Cause, all shares of Restricted Stock granted to such
                  Participant which have not vested as of the date of such
                  termination shall immediately be returned to the Company,
                  together with any dividends paid on such shares, in return for
                  which the Company shall repay to the Participant any amount
                  paid by the Participant for such shares.

      (i)   Effect of Change in Control

            The Committee in its sole and absolute discretion may provide,
            either at the time of grant or thereafter, that upon the occurrence
            of a Change in Control, shares of Restricted Stock which have not
            theretofore vested shall immediately vest in whole or in part and
            all restrictions on such shares shall immediately lapse in whole or
            in part.

      (j)   Special Provisions Regarding Awards

            Notwithstanding anything to the contrary contained herein,
            Restricted Stock granted pursuant to this Section 8 to Covered
            Employees may be based on the attainment by the Company of
            performance goals pre-established by the Committee, based on one or
            more of the following criteria (in each case, as determined in
            accordance with generally accepted accounting principles): (1)
            return on total shareholder equity; (2) earnings per share of
            Company Stock; (3) net income (before or after taxes); (4) earnings
            before interest, taxes, depreciation and amortization; (5) revenues;
            (6) return on assets; (7) market share; (8) cost reduction goals;
            (9) any combination of, or a specified increase in, any of the
            foregoing; (10) the achievement of certain target levels of
            discovery and/or development of products, including, without
            limitation, the regulatory approval of new products; (11) the
            achievement of certain target levels of sales of new products or
            licensing in or out of new drugs; (12) the formation of joint
            ventures, research or development collaborations, or the completion
            of other corporate transactions; and (13) such other criteria as the
            shareholders of the Company may approve. In addition, such
            performance goals may be based upon the attainment of specified
            levels of Company performance under one or more of the measures
            described above relative to the performance of other corporations.
            To the extent permitted under Section 162(m) of the Code (including,
            without limitation, compliance with any requirements for shareholder
            approval), the Committee may designate additional business criteria
            on which the performance goals may be based or adjust, modify or
            amend the aforementioned business criteria. Such shares of
            Restricted Stock shall be released from restrictions only after the
            attainment of such performance measures has been certified by the
            Committee.

9.    Phantom Stock

      (a)   Vesting Date

            At the time of the grant of shares of Phantom Stock, the Committee
            shall establish a Vesting Date or Vesting Dates with respect to such
            shares. The Committee may divide such shares into classes and assign
            a different Vesting Date for each class. Provided that all
            conditions to the vesting of a share of Phantom Stock imposed
            pursuant to Section 9(c) are satisfied, and except as provided in
            Section 9(d), upon the occurrence of the Vesting Date with respect
            to a share of Phantom Stock, such share shall vest.


                                      A-9
<PAGE>

      (b)   Benefit Upon Vesting

            Upon the vesting of a share of Phantom Stock, the Participant shall
            be entitled to receive, within thirty (30) days of the date on which
            such share vests, an amount, in cash and/or shares of Company Stock,
            as determined by the Committee, equal to the sum of (1) the Fair
            Market Value of a share of Company Stock on the date on which such
            share of Phantom Stock vests, and (2) the aggregate amount of cash
            dividends paid with respect to a share of Company Stock during the
            period commencing on the date on which the share of Phantom Stock
            was granted and terminating on the date on which such share vests.

      (c)   Conditions to Vesting

            At the time of the grant of shares of Phantom Stock, the Committee
            may impose such restrictions or conditions to the vesting of such
            shares as it, in its absolute discretion, deems appropriate, to be
            contained in the Agreement.

      (d)   Effect of Termination of Employment

            Except as the Committee in its sole and absolute discretion may
            otherwise provide in the applicable Agreement, and subject to the
            Committee's amendment authority pursuant to Section 4, shares of
            Phantom Stock that have not vested, together with any dividends
            credited on such shares, shall be forfeited upon the Participant's
            termination of employment for any reason.

      (e)   Effect of Change in Control

            The Committee in its sole and absolute discretion may provide,
            either at the time of grant or thereafter, that upon the occurrence
            of a Change in Control, outstanding shares of Phantom Stock which
            have not theretofore vested shall immediately vest in whole or in
            part and payment in respect of such vested shares shall be made in
            accordance with the terms of this Plan.

      (f)   Special Provisions Regarding Awards

            Notwithstanding anything to the contrary contained herein, the
            vesting of Phantom Stock granted pursuant to this Section 9 to
            Covered Employees may be based on the attainment by the Company of
            one or more of the performance criteria set forth in Section 8(j)
            hereof, in each case, as determined in accordance with generally
            accepted accounting principles. No payment in respect of any such
            Phantom Stock award shall be paid to a Covered Employee until the
            attainment of the respective performance measures have been
            certified by the Committee.

10.   Stock Bonuses

      In the event that the Committee grants a Stock Bonus, a certificate for
the shares of Company Stock constituting such Stock Bonus shall be issued in the
name of the Participant to whom such grant was made and delivered to such
Participant as soon as practicable after the date on which such Stock Bonus is
payable. Covered Employees shall be eligible to receive Stock Bonus grants
hereunder only after a determination of eligibility is made by the Committee, in
its sole discretion.

11.   Other Awards

      Other forms of Awards ("Other Awards") valued in whole or in part by
reference to, or otherwise based on, Company Stock may be granted either alone
or in addition to other Awards under the Plan. Subject to the provisions of the
Plan, the Committee shall have sole and complete authority to determine the
persons to whom and the time or times at which such Other Awards shall be
granted, the number of shares of Company Stock to be granted pursuant to such
Other Awards and all other conditions of such Other Awards.


                                      A-10
<PAGE>

12.   Nonemployee Director Formula Stock Options

      The provisions of this Section 12 shall apply only to grants of
Nonqualified Stock Options to Nonemployee Directors.

      (a)   General

            Nonemployee Directors shall receive Nonqualified Stock Options under
            the Plan. The exercise price per share of Company Stock purchasable
            pursuant to a Nonqualified Stock Option granted to a Nonemployee
            Director shall be the Fair Market Value of a share of Company Stock
            on the date of grant.

      (b)   Timing of Grant

            On January 1 of each calendar year, each then serving Nonemployee
            Director shall be automatically granted a Nonqualified Stock Option
            to purchase 15,000 shares of Company Stock. In addition, on the date
            that shareholders approve this Plan, each then Nonemployee Director
            shall be automatically granted a Nonqualified Stock Option to
            purchase 5,000 shares of Company Stock.

      (c)   Method and Time of Payment

            Each Nonqualified Stock Option granted under this Section 12 shall
            be exercised in the manner described in Section 7(c)(3).

      (d)   Term and Exercisability

            Each Nonqualified Stock Option granted under this Section 12 shall
            (1) become cumulatively exercisable as to 33-1/3% of the shares
            covered thereby on each of the first, second and third anniversaries
            of the date that the Nonqualified Stock Option is granted and (2)
            expire ten years from the date of grant. The exercisability of each
            Nonqualified Stock Option granted to a Nonemployee Director shall be
            subject to an acceleration of exercisability upon a Change in
            Control as described in Section 7(f).

      (e)   Termination

            Except as the Committee in its sole and absolute discretion may
            otherwise provide in an applicable Agreement, and subject to the
            Committee's amendment authority pursuant to Section 4, in the event
            of the termination of a Nonemployee Director's service with the
            Company other than for Cause, as defined in the Agreement, any
            outstanding Nonqualified Stock Option held by such Nonemployee
            Director under this Section 12, to the extent that it is exercisable
            on the date of such termination, may be exercised by such
            Nonemployee Director (or, if applicable, by his or her executors,
            administrator, legatees or distributees) during such period as may
            be provided in the Agreement (or as may be otherwise determined by
            the Committee) but in no event following the expiration of such
            Nonqualified Stock Option, and the remainder of the Nonqualified
            Stock Option which is not exercisable on the date of such
            termination, shall expire at the commencement of business on the
            date of such termination. In the event of the termination of a
            Nonemployee Director's service with the Company for Cause, as
            defined in the Agreement, all outstanding Nonqualified Stock Options
            granted to such Nonemployee Director shall expire at the
            commencement of business on the date of such termination. For
            purposes of the Plan, any termination of a Nonemployee Director's
            service with the Company shall not be deemed to occur if the
            Nonemployee Director continues to serve as consultant, employee or
            in any other capacity.

13.   Rights as a Shareholder

      No person shall have any rights as a shareholder with respect to any
shares of Company Stock covered by or relating to any Award until the date of
issuance of a stock certificate with respect to such shares. Except as otherwise
expressly provided in Section 3(c), no adjustment to any Award shall be made for
dividends or other rights for which the record date occurs prior to the date
such stock certificate is issued.


                                      A-11
<PAGE>

14.   No Employment Rights; No Right to Award

      Nothing contained in the Plan or any Agreement shall confer upon any
Participant any right with respect to the continuation of employment by the
Company or interfere in any way with the right of the Company, subject to the
terms of any separate employment agreement to the contrary, at any time to
terminate such employment or to increase or decrease the compensation of the
Participant.

      No person shall have any claim or right to receive an Award hereunder. The
Committee's granting of an Award to a participant at any time shall neither
require the Committee to grant any other Award to such Participant or other
person at any time or preclude the Committee from making subsequent grants to
such Participant or any other person.

15.   Securities Matters

      (a)   The Company shall be under no obligation to effect the registration
            pursuant to the Securities Act of any interests in the Plan or any
            shares of Company Stock to be issued hereunder or to effect similar
            compliance under any state laws. Notwithstanding anything herein to
            the contrary, the Company shall not be obligated to cause to be
            issued or delivered any certificates evidencing shares of Company
            Stock pursuant to the Plan unless and until the Company is advised
            by its counsel that the issuance and delivery of such certificates
            is in compliance with all applicable laws, regulations of
            governmental authority and the requirements of any securities
            exchange on which shares of Company Stock are traded. The Committee
            may require, as a condition of the issuance and delivery of
            certificates evidencing shares of Company Stock pursuant to the
            terms hereof, that the recipient of such shares make such agreements
            and representations, and that such certificates bear such legends,
            as the Committee, in its sole discretion, deems necessary or
            desirable.

      (b)   The transfer of any shares of Company Stock hereunder shall be
            effective only at such time as counsel to the Company shall have
            determined that the issuance and delivery of such shares is in
            compliance with all applicable laws, regulations of governmental
            authority and the requirements of any securities exchange on which
            shares of Company Stock are traded. The Committee may, in its sole
            discretion, defer the effectiveness of any transfer of shares of
            Company Stock hereunder in order to allow the issuance of such
            shares to be made pursuant to registration or an exemption from
            registration or other methods for compliance available under federal
            or state securities laws. The Committee shall inform the Participant
            in writing of its decision to defer the effectiveness of a transfer.
            During the period of such deferral in connection with the exercise
            of an Option, the Participant may, by written notice, withdraw such
            exercise and obtain the refund of any amount paid with respect
            thereto.

16.   Withholding Taxes

      Whenever cash is to be paid pursuant to an Award, the Company shall have
the right to deduct therefrom an amount sufficient to satisfy any federal, state
and local withholding tax requirements related thereto.

      Whenever shares of Company Stock are to be delivered pursuant to an Award,
the Company shall have the right to require the Participant to remit to the
Company in cash an amount sufficient to satisfy any federal, state and local
withholding tax requirements related thereto. With the approval of the
Committee, a Participant may satisfy the foregoing requirement by electing to
have the Company withhold from delivery shares of Company Stock having a value
equal to the minimum amount of tax required to be withheld. Such shares shall be
valued at their Fair Market Value on the date of which the amount of tax to be
withheld is determined. Fractional share amounts shall be settled in cash. Such
a withholding election may be made with respect to all or any portion of the
shares to be delivered pursuant to an Award.

17.   Notification of Election Under Section 83(b) of the Code

      If any Participant shall, in connection with the acquisition of shares of
Company Stock under the Plan, make the election permitted under Section 83(b) of
the Code, such Participant shall notify the Company of such election within ten
(10) days of filing notice of the election with the Internal Revenue Service.


                                      A-12
<PAGE>

18.   Notification Upon Disqualifying Disposition Under Section 421(b) of the
      Code

      Each Agreement with respect to an Incentive Stock Option shall require the
Participant to notify the Company of any disposition of shares of Company Stock
issued pursuant to the exercise of such Option under the circumstances described
in Section 421(b) of the Code (relating to certain disqualifying dispositions),
within ten (10) days of such disposition.

19.   Amendment or Termination of the Plan

      The Board of Directors may, at any time, suspend or terminate the Plan or
revise or amend it in any respect whatsoever; provided, however, that
shareholder approval shall be required if and to the extent the Board of
Directors determines that such approval is appropriate for purposes of
satisfying Sections 162(m) or 422 of the Code or Rule 16b-3 or other applicable
law. Awards may be granted under the Plan prior to the receipt of such
shareholder approval but each such grant shall be subject in its entirety to
such approval and no award may be exercised, vested or otherwise satisfied prior
to the receipt of such approval. Nothing herein shall restrict the Committee's
ability to exercise its discretionary authority pursuant to Section 4, which
discretion may be exercised without amendment to the Plan. No action hereunder
may, without the consent of a Participant, reduce the Participant's rights under
any outstanding Award.

20.   Transferability

      Upon the death of a Participant or Nonemployee Director, outstanding
Awards granted to such Participant or Nonemployee Director may be exercised only
by the executor or administrator of the Participant's or Nonemployee Director's
estate or by a person who shall have acquired the right to such exercise by will
or by the laws of descent and distribution. No transfer of an Award by will or
the laws of descent and distribution shall be effective to bind the Company
unless the Committee shall have been furnished with (a) written notice thereof
and with a copy of the will and/or such evidence as the Committee may deem
necessary to establish the validity of the transfer, and (b) an agreement by the
transferee to comply with all the terms and conditions of the Award that are or
would have been applicable to the Participant or Nonemployee Director and to be
bound by the acknowledgments made by the Participant or Nonemployee Director in
connection with the grant of the Award.

      During the lifetime of a Participant or Nonemployee Director, the
Committee may, in its sole and absolute discretion, permit the transfer of an
outstanding Option, unless such Option is an Incentive Stock Option and the
Committee and the Participant intends that it shall retain such status. Subject
to the approval of the Committee and to any conditions that the Committee may
prescribe, a Participant or Nonemployee Director may, upon providing written
notice to the Secretary of the Company, elect to transfer any or all Options
granted to such Participant pursuant to the Plan to members of his or her
immediate family (including, but not limited to, children, grandchildren and
spouse or to trusts for the benefit of such immediate family members or to
partnerships in which such family members are the only partners) or to other
persons or entities approved by the Committee; provided, however, that no such
transfer by any Participant or Nonemployee Director may be made in exchange for
consideration.

21.   Expenses and Receipts

      The expenses of the Plan shall be paid by the Company. Any proceeds
received by the Company in connection with any Award shall be used for general
corporate purposes.

22.   Failure to Comply

      In addition to the remedies of the Company elsewhere provided for herein,
failure by a Participant or Nonemployee Director (or beneficiary) to comply with
any of the terms and conditions of the Plan or the applicable Agreement, unless
such failure is remedied by such Participant or Nonemployee Director (or
beneficiary) within ten days after notice of such failure by the Committee,
shall be grounds for the cancellation and forfeiture of such Award, in whole or
in part, as the Committee, in its absolute discretion, may determine.


                                      A-13
<PAGE>

23.   Effective Date and Term of Plan

      The Plan shall be subject to the requisite approval of the shareholders of
the Company. In the absence of such approval, any Awards shall be null and void.
Unless earlier terminated by the Board of Directors, the right to grant Awards
under the Plan shall terminate on the tenth anniversary of the Effective Date.
Awards outstanding at Plan termination shall remain in effect according to their
terms and the provisions of the Plan.

24.   Applicable Law

      Except to the extent preempted by any applicable federal law, the Plan
shall be construed and administered in accordance with the laws of the State of
New York without reference to its principles of conflicts of law.

25.   Participant Rights

      No Participant shall have any claim to be granted any award under the
Plan, and there is no obligation for uniformity of treatment for Participants.
Except as provided specifically herein, a Participant or a transferee of an
Award (including a transferee of a Nonemployee Director) shall have no rights as
a shareholder with respect to any shares covered by any Award until the date of
the issuance of a Company Stock certificate to him or her for such shares.

26.   Unfunded Status of Awards

      The Plan is intended to constitute an "unfunded" plan for incentive and
deferred compensation. With respect to any payments not yet made to a
Participant pursuant to an Award, nothing contained in the Plan or any Agreement
shall give any such Participant any rights that are greater than those of a
general creditor of the Company.

27.   No Fractional Shares

      No fractional shares of Company Stock shall be issued or delivered
pursuant to the Plan. The Committee shall determine whether cash, other Awards,
or other property shall be issued or paid in lieu of such fractional shares or
whether such fractional shares or any rights thereto shall be forfeited or
otherwise eliminated.

28.   Beneficiary

      A Participant or Nonemployee Director may file with the Committee a
written designation of a beneficiary on such form as may be prescribed by the
Committee and may, from time to time, amend or revoke such designation. If no
designated beneficiary survives the Participant or Nonemployee Director, the
executor or administrator of the Participant's or Nonemployee Director's estate
shall be deemed to be the grantee's beneficiary.

29.   Interpretation

      The Plan is designed and intended to comply with Rule 16b-3 and, to the
extent applicable, with Section 162(m) of the Code, and all provisions hereof
shall be construed in a manner to so comply.

30.   Severability

      If any provision of the Plan is held to be invalid or unenforceable, the
other provisions of the Plan shall not be affected but shall be applied as if
the invalid or unenforceable provision had not been included in the Plan.


                                      A-14

<PAGE>

                         Please date, sign and mail your
                       proxy card back as soon as possible

                         Annual Meeting of Shareholders
                         REGENERON PHARMACEUTICALS, INC.

                                  June 9, 2000

- -------------------------------------------------------------------------------
PROXY

           THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
                                       OF
                         REGENERON PHARMACEUTICALS, INC.

         The undersigned hereby appoints Leonard S. Schleifer, M.D., Ph.D. and
P. Roy Vagelos, M.D. as proxies, with power to act with the other and with power
of substitution, and hereby authorizes them to represent and vote, as designated
on the other side, all the shares of stock of Regeneron Pharmaceuticals, Inc.
standing in the name of the undersigned with all powers which the undersigned
would possess if present at the Annual Meeting of Shareholders of the Company to
be held on June 9, 2000 or any adjournment therof.

       (Continued, and to be marked, dated, and signed on the other side)
- -------------------------------------------------------------------------------

[X] Please mark your votes as in this example

The Board of Directors recommends a vote FOR Items 1, 2, 3, and 4.

                                     WITHHELD
                            FOR      FOR ALL

Item 1.                                             Nominees:
    ELECTION                                        Charles A. Baker
    OF DIRECTORS           ______      _______      Michael S. Brown, M.D.
                                                    George L. Sing

WITHHELD FOR: (Write that nominee's name
in the space provided below.)

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

<TABLE>
<CAPTION>
                                                                         FOR        AGAINST         ABSTAIN

<S>                                                                     <C>         <C>             <C>
Item 2. To approve the adoption of the Regeneron Pharmaceuticals,
        Inc. 2000 Long-Term Incentive Plan.                             _____        ______          ______

Item 3. To approve the selection of PricewaterhouseCoopers
        LLP as independent accountants for the fiscal year
        ending December 31, 2000.                                       _____        ______          ______

Item 4. In their discretion, to act upon such other matters as may
        properly come before the meeting and any adjournment or
        postponement thereof.                                           _____        ______          ______

                                      Joint
Signature:_________________________ Signature:______________________ Date:________, 2000
                                                 (if applicable)
</TABLE>

NOTE: Please sign as name appears hereon. Joint owners should each sign. When
      signed as attorney, executor, administrator, trustee, or guardian, please
      give full title as such.



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