GENZYME CORP
S-3, 2000-12-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 13, 2000
                                                     REGISTRATION NO. 333-
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                    U.S. SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 205493
                            ------------------------
                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                            ------------------------

                              GENZYME CORPORATION
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                                  <C>
                   MASSACHUSETTS                                         06-1047163
           (State or other jurisdiction                               (I.R.S. Employer
         of incorporation or organization)                         Identification Number)
</TABLE>

               ONE KENDALL SQUARE, CAMBRIDGE, MASSACHUSETTS 02139
                                 (617) 252-7500
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                         ------------------------------

                               PETER WIRTH, ESQ.
                Executive Vice President and Chief Legal Officer
                              Genzyme Corporation
                               One Kendall Square
                         Cambridge, Massachusetts 02139
                                 (617) 252-7500
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                with copies to:

                             PAUL M. KINSELLA, ESQ.
                               Palmer & Dodge LLP
                               One Beacon Street
                          Boston, Massachusetts 02108
                                 (617) 573-0100
                         ------------------------------

        Approximate date of commencement of proposed sale to the public:
   From time to time after the effective date of this Registration Statement.
                         ------------------------------

    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. / /

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
                         ------------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
        TITLE OF EACH CLASS             AMOUNT TO BE        PROPOSED MAXIMUM          PROPOSED MAXIMUM         AMOUNT OF
   OF SECURITIES TO BE REGISTERED        REGISTERED     OFFERING PRICE PER SHARE  AGGREGATE OFFERING PRICE  REGISTRATION FEE
<S>                                   <C>               <C>                       <C>                       <C>
Genzyme General Division Common
  Stock, $0.01 par value per
  share.............................     224,093(1)            $74.60(2)               $7,530,528(3)           $1,989(4)
</TABLE>

(1) Represents the estimated maximum number of shares of Genzyme General
    Division common stock of the Registrant to be issued upon the exercise of
    options and warrants of GelTex Pharmaceuticals, Inc. ("GelTex") following
    the completion of the merger of GelTex with and into a wholly-owned
    subsidiary of the Registrant (the "Merger") based on the issuance of .7272
    of a share of Genzyme General Division common stock for each share of common
    stock of GelTex that the options and warrants were exercisable for
    immediately before the completion of the Merger. Includes associated
    purchase rights which currently are evidenced by certificates for shares of
    Genzyme General Division common stock and automatically trade with such
    shares.

(2) Following the Merger, each holder of an option or warrant may purchase
    shares of Genzyme General Division common stock pursuant to the terms of its
    option or warrant agreement. The proposed maximum offering price per share
    reflects what will be the highest exercise price per share of Genzyme
    General Division common stock represented by the terms of the option and
    warrant agreements following the merger.

(3) Since the shares of Genzyme General Division common stock issuable upon the
    exercise of the options and warrants following the Merger will have exercise
    prices ranging from $3.03 to $74.60 per share of Genzyme General Division
    common stock, the proposed maximum aggregate offering price constitutes the
    maximum amount of proceeds receivable by Genzyme Corporation.

(4) Calculated pursuant to Rule 457(g) under the Securities Act of 1933, as
    amended.

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(a), MAY DETERMINE.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>
The information in this prospectus is not complete and may be changed. We may
not sell these securities until the Securities and Exchange Commission declares
our registration statement effective. This prospectus is not an offer to sell
these securities and it is not soliciting an offer to buy these securities in
any state where the offer or sale is not permitted.
<PAGE>
                 SUBJECT TO COMPLETION, DATED DECEMBER 13, 2000

                                    GENZYME
                                 224,093 SHARES
                     GENZYME GENERAL DIVISION COMMON STOCK

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

    We are registering a total of 224,093 shares of Genzyme General Division
common stock that are issuable upon the exercise of options and warrants that we
assumed as part of our acquisition of GelTex Pharmaceuticals, Inc. The exercise
prices of these options and warrants range from a low of $3.03 per share to a
high of $74.60 per share. If all of these options and warrants are exercised in
full, we will receive total cash proceeds of approximately $7,530,528.

    Genzyme General Division common stock is one of Genzyme Corporation's three
tracking stocks. It is quoted on the Nasdaq National Market under the trading
symbol "GENZ," and on December 12, 2000, its closing price was $ 95.0625 per
share.

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

    INVESTING IN SHARES OF GENZYME GENERAL DIVISION COMMON STOCK INVOLVES A HIGH
DEGREE OF RISK. YOU SHOULD CAREFULLY READ AND CONSIDER THE "RISK FACTORS"
BEGINNING ON PAGE 4.

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

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

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

    You should rely only on the information included in this prospectus. We have
not authorized anyone to provide you with different information. You should not
assume that the information in this prospectus is accurate as of any date other
than date below.

               THE DATE OF THIS PROSPECTUS IS DECEMBER   , 2000.

       Genzyme Corporation - One Kendall Square, Cambridge, Massachusetts
                             02139 - (617) 252-7500
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
Genzyme Corporation.........................................      2
Where You Can Find More Information.........................      2
Risk Factors................................................      4
Special Note Regarding Forward-Looking Statements...........     17
Plan of Distribution........................................     17
Use of Proceeds.............................................     18
Legal Matters...............................................     18
Experts.....................................................     18
</TABLE>

NOTE REGARDING TRADEMARKS

Genzyme-Registered Trademark-, Cerezyme-Registered Trademark-,
Ceredase-Registered Trademark- and Sepra Film-Registered Trademark- are
registered trademarks of Genzyme
  Corporation.

Fabrazyme-TM- is a trademark of Genzyme Corporation.

Genzyme-Registered Trademark- is a registered service mark of Genzyme
Corporation.

AVONEX-Registered Trademark- is a registered trademark of Biogen, Inc.

Renagel-Registered Trademark- is a registered trademark of GelTex
Pharmaceuticals, Inc.

Synvisc-Registered Trademark- is a registered trademark of Genzyme Biosurgery
Corporation.

NOTE REGARDING REFERENCES TO GENZYME DIVISIONS AND SERIES OF STOCK.

    Throughout this prospectus, the words "we," "us," "our" and "Genzyme" refer
to Genzyme Corporation and all of its operating divisions taken as a whole, and
"our board of directors" refers to the board of directors of Genzyme
Corporation. In addition, we refer to our four operating divisions as follows:

    - Genzyme General Division = "Genzyme General;"

    - Genzyme Molecular Oncology Division = "Genzyme Molecular Oncology;" and

    - Genzyme Biosurgery Division = "Genzyme Biosurgery."

    We currently have three designated series of common stock. Each of these
series is intended to reflect the value and track the performance of one of our
divisions. We refer to each series of common stock as follows:

    - Genzyme General Division Common Stock = "Genzyme General Stock;"

    - Genzyme Molecular Oncology Division Common Stock = "Molecular Oncology
      Stock;" and

    - Genzyme Biosurgery Division Common Stock = "Biosurgery Stock."
<PAGE>
                              GENZYME CORPORATION

    We are a biotechnology company that develops innovative products and
services for major unmet medical needs. Genzyme was founded in 1981 and became a
Massachusetts corporation in 1991. We currently have three operating divisions.
We also have three series of common stock--or "tracking" stock--which are
designed to reflect the value and track the financial performance of these
operating divisions. Our three operating divisions are:

    - Genzyme General, which develops and markets therapeutic products and
      diagnostic products and services, with an emphasis on therapies for
      genetic diseases;

    - Genzyme Molecular Oncology, which develops cancer products, with a focus
      on cancer vaccines and angiogenisis inhibitors. It is shaping these new
      therapies through the integration of its genomics, gene discovery, cell
      therapy, small molecule drug discovery and protein therapeutic efforts;
      and

    - Genzyme Biosurgery, which develops and markets devices, biomaterials,
      biotherapeutics and other products for the orthopedic market and the
      cardiovascular, general and plastic surgery markets.

    We allocate all of our products, services, programs, assets and liabilities
among our divisions for purposes of financial statement presentation; however,
Genzyme, the corporation, continues to own all of the assets and is responsible
for all of the liabilities allocated to each of the divisions.

                      WHERE YOU CAN FIND MORE INFORMATION

    You may read and copy any reports, statements or other information that we
file with the SEC at the SEC's public reference rooms at the following
locations:

<TABLE>
<CAPTION>

<S>                            <C>                            <C>
Public Reference Room          New York Regional Office       Chicago Regional Office
450 Fifth Street, N.W.         7 World Trade Center           Citicorp Center
Room 1024                      Suite 1300                     500 West Madison Street
Washington, D.C. 20549         New York, NY 10048             Suite 1400
                                                              Chicago, IL 60661-2511
</TABLE>

    Please call the SEC at 1-800-SEC-0330 for further information on the public
reference rooms. These SEC filings are also available to the public from
commercial document retrieval services and at the Internet world wide web site
maintained by the SEC at "http://www.sec.gov." Reports, proxy statements and
other information concerning us may also be inspected at the offices of The
Nasdaq Stock Market, which is located at 1735 K Street, N.W., Washington, D.C.
20006.

    The SEC allows us to "incorporate by reference" information into this
prospectus, which means that we can disclose important information to you by
referring you to other documents filed separately with the SEC. The information
incorporated by reference is considered part of this prospectus, except for any
information superseded by information contained directly in this prospectus or
in later-filed documents incorporated by reference in this prospectus.

    This prospectus incorporates by reference the documents set forth below that
we have previously filed with the SEC. These documents contain important
business and financial information about Genzyme that is not included in or
delivered with this prospectus.

    1.  Annual Report on Form 10-K for the year ended December 31, 1999, as
       amended by amendments on Form 10-K/A filed with the SEC on June 28, 2000
       and October 17, 2000;

                                       2
<PAGE>
    2.  Quarterly Reports on Form 10-Q for the quarters ended March 31, 2000, as
       amended on Form 10-Q/A filed with the SEC on October 17, 2000, June 30,
       2000, as amended on Form 10-Q/A filed with the SEC on October 17, 2000,
       and September 30, 2000;

    3.  Current Reports on Form 8-K filed with the SEC on January 10, 2000,
       March 15, 2000, March 23, 2000, June 30, 2000, July 14, 2000, July 19,
       2000, September 12, 2000, September 13, 2000, November 20, 2000 and
       December [19], 2000;

    4.  The description of Genzyme General Stock contained in our Registration
       Statement on Form 8-A/A filed with the SEC on June 30, 2000, including
       any further amendment or report filed after the date of this prospectus
       for the purpose of updating such description; and

    5.  The description of Genzyme General Stock purchase rights contained in
       our Registration Statement on Form 8-A/A filed with the SEC on June 11,
       1999 including any further amendment or report filed after the date of
       this prospectus for the purpose of updating such description.

    We also incorporate by reference additional documents that we may file with
the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act between the
date of this prospectus and the date that we terminate this offering. These
include periodic reports, such as Annual Reports on Form 10-K, Quarterly Reports
on Form 10-Q and Current Reports on Form 8-K, as well as proxy statements.

    You may request a copy of these filings and future filings, at no cost, by
writing or telephoning us at the following address or number:

                              Shareholder Services
                              Genzyme Corporation
                               One Kendall Square
                         Cambridge, Massachusetts 02139
                                 (617) 252-7526

                                       3
<PAGE>
                                  RISK FACTORS

    IF YOU PURCHASE SHARES OF GENZYME GENERAL STOCK, YOU WILL TAKE ON FINANCIAL
RISK. IN DECIDING WHETHER TO INVEST, YOU SHOULD CAREFULLY CONSIDER THE FOLLOWING
RISK FACTORS IN ADDITION TO THE OTHER INFORMATION INCLUDED AND INCORPORATED BY
REFERENCE IN THIS PROSPECTUS.

                   RISKS RELATING TO GENZYME TRACKING STOCKS

    The following are risks related to owning shares of our tracking stock. You
should consider carefully these risk factors before deciding whether to invest
in our stock.

    THE HOLDERS OF OUR TRACKING STOCK ARE STOCKHOLDERS OF A SINGLE COMPANY AND
    UNFAVORABLE FINANCIAL TRENDS AFFECTING ONE DIVISION COULD NEGATIVELY AFFECT
    OTHER GENZYME DIVISIONS.

    None of our divisions are separate legal entities. Holders of Genzyme
General Stock, together with holders of our other series of tracking stock, are
stockholders of a single company and face all of the risks of an investment in
Genzyme.

    For purposes of financial presentation, we allocate programs, products,
assets and liabilities among our operating divisions. Genzyme Corporation,
however, continues to own all of the assets and is responsible for all of the
liabilities of each division. A holder of Genzyme General Stock, for example,
does not have any specific rights to the assets allocated to Genzyme General in
our financial statements. Furthermore, if we are unable to satisfy one
division's liabilities out of the assets we allocate to that division, we may be
required to satisfy those liabilities with assets we have allocated to another
division. We encourage you to review our consolidated financial statements and
the financial statements of Genzyme General included in the reports that we file
with the SEC.

    OUR BOARD OF DIRECTORS MAY TAKE ACTIONS THAT HAVE AN UNEQUAL AND ADVERSE
    EFFECT ON ONE OR MORE SERIES OF OUR TRACKING STOCK.

    At times, the interests of the holders of the different series of our
tracking stock may diverge or appear to diverge from each other. We are not
aware of any legal precedent interpreting the fiduciary duties of the directors
of a Massachusetts corporation in that situation. Recent cases in Delaware have
established that a Delaware court will afford considerable deference to business
decisions that are made in good faith by a disinterested and adequately informed
board of directors even when those decisions involve disparate treatment of
different series of tracking stock. These Delaware cases rely upon the premise
that the board of directors owes its fiduciary duties to the corporation and all
of its stockholders and does not owe separate duties to each class or series of
stockholders. We do not know to what extent a Massachusetts court would be
influenced by these Delaware decisions. If a Massachusetts court were to follow
the reasoning in these Delaware cases, a Genzyme stockholder may not be able to
successfully challenge an action by the board of directors that has a
disadvantageous effect on a particular series of our tracking stock.

    MEMBERS OF OUR BOARD OF DIRECTORS MAY FAVOR ONE SERIES OF TRACKING STOCK
    OVER ANOTHER IF THEY OWN A DISPROPORTIONATE AMOUNT OF THAT SERIES.

    A member of our board of directors may own a disproportionate amount of
tracking stock in a particular series, or the value of his or her holdings of a
particular series of stock may be different from the value of his or her
holdings in another series. This disparate stock ownership may cause the board
member to favor one series of stock over another. Nevertheless, we believe that
a member of our board of directors could properly perform his or her fiduciary
responsibilities to all of our stockholders even if his or her interests in
shares of different series are disproportionate or of unequal values. Our board
members may create committees to review matters that raise conflict-of-interest
issues. If a committee is formed, it would report to the full board of
directors.

                                       4
<PAGE>
    HOLDERS OF OUR TRACKING STOCK HAVE LIMITED DECISION-MAKING POWER BECAUSE
    THEY HAVE LIMITED SEPARATE VOTING RIGHTS.

    Holders of all series of our tracking stock generally vote together as a
single class on all matters requiring common stockholder approval, including the
election of directors. Holders of one series of tracking stock do not have the
right to vote on matters separately from the other series except in limited
circumstances. These circumstances are dictated by Massachusetts law, our
charter and the management and accounting policies adopted by our board of
directors. Therefore, stockholders of one series of tracking stock generally
could not make a proposal that would require approval only of the holders of
that series. Instead, they would have to obtain approval from all common
stockholders.

    THE VOTES PER SHARE OF OUR TRACKING STOCKS ARE ADJUSTED EVERY TWO YEARS.

    Under our charter, Genzyme General Stock is entitled to one vote per share,
which is never adjusted. However, the votes per share of our other tracking
stocks are adjusted every two years. Specifically, on January 1, 2001 and every
second anniversary thereafter, the vote per share to which each outstanding
tracking stock is entitled will be recalculated based on its fair market value
divided by the fair market value of a share of Genzyme General Stock, with "fair
market value" meaning the average closing price over the 20 consecutive trading
days beginning the 30th trading day preceding the January 1st adjustment date.
At the time of an adjustment, the per share voting power of any Genzyme tracking
stock relative to the other series of tracking stock could decrease materially.
Additionally, during the intervening period between adjustments, the per share
voting power of each tracking stock will remain the same even though its market
price will fluctuate relative to, and could become materially greater than, the
market prices of the other tracking stocks.

    THE LIQUIDATION RIGHTS FOR EACH SERIES OF TRACKING STOCK ARE NOT ADJUSTED TO
    REFLECT CHANGES IN THE MARKET VALUE OF THAT SERIES.

    If we dissolve, liquidate or wind up our affairs, other than as part of a
merger, business combination or sale of substantially all of our assets, our
stockholders would receive any remaining assets according to the percentage of
total liquidation units that they hold. The number of liquidation units per
share for each series of our tracking stock is as follows:

    - each share of Genzyme General Stock has 100 liquidation units;

    - each share of Molecular Oncology Stock has 25 liquidation units; and

    - each share of Biosurgery Stock has 50 liquidation units.

    Although we adjust liquidation units to prevent dilution in the event of
some subdivisions, combinations or distributions of common stock, we do not
adjust them to reflect changes in the relative market value or performance of
the divisions. Therefore, at the time of a dissolution, liquidation or winding
up, the relative liquidation units attributable to each series of tracking stock
may not correspond to the value of the underlying assets allocated to that
division.

    OUR BOARD OF DIRECTORS MAY CHANGE ITS MANAGEMENT AND ACCOUNTING POLICIES TO
    THE DETRIMENT OF ONE SERIES OF TRACKING STOCK WITHOUT STOCKHOLDER APPROVAL.

    Our board of directors has adopted management and accounting policies that
are used to govern our business and to prepare our financial statements. These
policies cover the allocation of corporate expenses, assets and liabilities and
other accounting matters, and the reallocation of assets between divisions and
other matters. Our board of directors generally may modify or rescind these
policies or adopt new ones without stockholder approval. Any revised policies
could have different effects on each series of our tracking stock and could be
detrimental to one series as compared to another. The discretion of our board of
directors to make changes is limited only by the policies themselves and the
board's fiduciary duty to all of our stockholders. We encourage you to review
the full text of our

                                       5
<PAGE>
management and accounting policies, a copy of which is attached as Exhibit   to
our Current Report on Form 8-K that we filed with the SEC on December [19],
2000.

    WE MAY ELIMINATE TRACKING STOCK IF A CORPORATE LEVEL TAX IS IMPOSED ON THE
    ISSUANCE OF TRACKING STOCK.

    In 1999, the Clinton Administration proposed tax legislation that would have
imposed a corporate level tax on issuances of tracking stock. In 2000, the
Clinton Administration proposed legislation that would tax stockholders upon the
receipt of tracking stock from the issuing corporation as a distribution or in a
tracking stock exchange. Congress has not enacted either of these proposals into
law. If these or similar proposals are enacted into law or effected through
Treasury regulations, we could be taxed on an amount up to the gain realized in
future financings in which we sell tracking stock, including Genzyme General
Stock. Also, any use of our tracking stock to acquire other companies could
result in a tax to us, the stockholders of the target company, or both. We also
may be taxed if we distribute to stockholders "designated" shares of tracking
stock, which are shares designated by the tracked division as issuable at the
option of our board of directors for Genzyme General's benefit. In addition,
stockholders could be taxed if they receive a distribution of designated shares
of tracking stock or if they receive shares of tracking stock in exchange for
other Genzyme stock. These or similarly adverse tax consequences could cause us
to eliminate tracking stock from our capital structure. We cannot predict,
however, whether Congress will enact legislation, or whether the Treasury
Department will issue regulations effecting these or similar proposals.

    WE CANNOT ASSURE THAT OUR TRACKING STOCKS WILL "TRACK" THE PERFORMANCE OF
    THE CORRESPONDING DIVISION.

    Although we have attempted to design our tracking stocks to "track" the
performance of their corresponding divisions, we cannot assure that the market
prices of these stocks will indeed reflect that performance. The market may
assign values to a tracking stock that are based on factors other than a
corresponding division's reported financial performance. For instance, we cannot
be certain what, if any, valuation the market might place on the mandatory and
optional exchange features or the differing voting rights and liquidation units
of the tracking stocks. In addition, as discussed above under the subheading
"--THE HOLDERS OF OUR TRACKING STOCK ARE STOCKHOLDERS OF A SINGLE COMPANY AND
UNFAVORABLE FINANCIAL TRENDS AFFECTING ONE DIVISION COULD NEGATIVELY AFFECT
OTHER GENZYME DIVISIONS," financial developments in one division, particularly
if significant and/or adverse, may affect other divisions.

                       RISKS RELATING TO GENZYME GENERAL

    Genzyme General Stock is intended to track the value and reflect the
performance of Genzyme General. Accordingly, you should carefully consider the
following factors affecting the business of Genzyme General.

    A REDUCTION IN REVENUE FROM SALES OF PRODUCTS THAT TREAT GAUCHER DISEASE
    WOULD HAVE AN ADVERSE EFFECT ON OUR BUSINESS.

    Genzyme General generates a majority of its product revenues from sales of
enzyme-replacement products for patients with Gaucher disease. Genzyme General
entered this market in 1991 with Ceredase enzyme. Because production of Ceredase
enzyme was subject to supply constraints, Genzyme General developed Cerezyme
enzyme, a recombinant form of the enzyme. Recombinant technology uses specially
engineered cells to produce enzymes, or other substances, by inserting into the
cells of one organism the genetic material of a different species. In the case
of Cerezyme enzyme, scientists engineer Chinese hamster ovary cells to produce
human alpha glucocerebrosidase. Genzyme General stopped producing Ceredase
enzyme, except for small quantities, during 1998, after substantially all the
patients who previously used Ceredase enzyme converted to Cerezyme enzyme. Sales
of Ceredase enzyme and Cerezyme enzyme totaled $478.5 million for the year ended
December 31, 1999, representing approximately 62% of our, and 75% of Genzyme
General's, total revenues for that year,

                                       6
<PAGE>
and $400.2 million for the nine months ended September 30, 2000, representing
approximately 61% of our, and 73% of Genzyme General's, total revenues for that
period.

    Because our business is highly dependent on Cerezyme enzyme, a decline in
the growth rate of Cerezyme enzyme sales could have an adverse effect on our
operations and may cause the value of our securities to decline substantially.
We will lose revenues from Cerezyme enzyme if competitors develop alternative
treatments for Gaucher disease and these alternative products gain commercial
acceptance. Some companies have initiated efforts to develop competitive
products, and other companies may do so in the future. In addition, the patient
population with Gaucher disease is limited. Because a significant percentage of
that population already uses Cerezyme enzyme, opportunities for future sales
growth are limited. Further, changes in the methods for treating patients with
Gaucher disease, including treatment protocols that combine Cerezyme enzyme with
other therapeutic products or reduce the amount of Cerezyme enzyme prescribed,
could result in a decline in Cerezyme enzyme sales. Cerezyme enzyme has orphan
drug status, providing us with exclusive marketing rights for Cerezyme enzyme in
the United States until May 2001. We also have patents protecting our method of
manufacturing Cerezyme enzyme until 2010 and the composition of Cerezyme enzyme
until 2013. The expiration of market exclusivity and orphan drug status in
May 2001 will likely subject Cerezyme enzyme to increased competition which may
decrease the amount of revenue we receive from this product or the growth of
that revenue.

    GENZYME GENERAL MAY NOT BE ABLE TO SIGNIFICANTLY INCREASE SALES OF RENAGEL
    BRAND PHOSPHATE BINDER.

    In November 1998, Genzyme General, launched Renagel brand phosphate binder,
a non-absorbed phosphate binder approved for use by patients with end-stage
renal disease undergoing a form of treatment known as hemodialysis. We are
currently conducting additional clinical trials in order to determine the
efficacy and safety of Renagel brand phosphate binder when administered to
pre-dialysis patients. The commercial success of Renagel brand phosphate binder,
however, is subject to substantial uncertainty and will depend on a number of
factors, including:

    - the results of additional clinical trials for additional indications and
      expanded labeling;

    - our ability to increase market acceptance and sales of Renagel brand
      phosphate binder;

    - market acceptance of a tablet formulation of Renagel brand phosphate
      binder, which was launched in September 2000 in the United States;

    - optimal dosing and patient compliance with respect to Renagel brand
      phosphate binder;

    - the availability of competing treatments serving the dialysis market;

    - the content and timing of our submissions to and decisions by regulatory
      authorities;

    - our ability to manufacture Renagel brand phosphate binder at a reasonable
      price;

    - the availability of reimbursement from third-party payers; and

    - the accuracy of available information about dialysis patient populations
      and the accuracy of our expectations about growth in this population.

    Many of the risks that apply to Renagel brand phosphate binder also apply to
our other products. Accordingly, we refer you to the regulatory, legislative,
development, reimbursement and market risks described in more detail under the
subsection of this prospectus entitled "--Risks Relating to Genzyme" below.

                                       7
<PAGE>
    GENZYME GENERAL MAY NOT BE ABLE TO SUCCESSFULLY COMMERCIALIZE THYROGEN
    HORMONE.

    In January 1999, Genzyme General, together with Knoll Pharmaceutical Co.,
launched U.S. sales of Thyrogen recombinant thyroid stimulating hormone used to
diagnose thyroid cancer. The commercial success of Thyrogen hormone will depend
on a number of factors, including:

    - regulation by the Food and Drug Administration, commonly referred to as
      the FDA;

    - our ability to obtain regulatory approvals in foreign countries;

    - the development and commercial success of competitive products; and

    - the availability of reimbursement from third-party payers.

    Genzyme General cannot be sure that market penetration of Thyrogen hormone
will increase.

    IF GENZYME GENERAL'S STRATEGIC ALLIANCES TO DEVELOP AND COMMERCIALIZE ITS
    PRODUCTS ARE UNSUCCESSFUL, GENZYME GENERAL'S EARNINGS GROWTH WILL BE
    LIMITED.

    Several of Genzyme General's strategic initiatives involve alliances with
other biotechnology companies. These include:

    - the agreement with Knoll Pharmaceutical for the marketing of Thyrogen
      hormone in the United States;

    - an agreement with Biogen, Inc. for the marketing of AVONEX (Interferon
      beta1a), Biogen's treatment for relapsing forms of multiple sclerosis, in
      Japan following regulatory approval;

    - a joint venture with BioMarin Pharmaceutical Inc. for the development and
      commercialization of alpha-L-iduronidase for the treatment of the
      lysosomal storage disorder known as mucopolysaccharidosis I;

    - a joint venture with Genzyme Transgenics Corporation for the development
      and commercialization of transgenic antithrombin III, a human protein that
      Genzyme Transgenics produces in the milk of genetically modified animals;

    - a strategic alliance with Pharming Group N.V. for the development,
      commercialization of human alpha-glucosidase produced using a Chinese
      hamster ovary cell line for the treatment of Pompe disease; and

    - a joint venture with Diacrin, Inc. to develop and commercialize products
      and processes using porcine fetal cells for the treatment of Parkinson's
      disease and Huntington's disease.

    Genzyme General plans to enter into additional alliances in the future. The
success of many of these arrangements is largely dependent on technology and
other intellectual property contributed by Genzyme General's strategic partners
to the alliances or the resources, efforts and skills of Genzyme General's
partners. Genzyme General's strategic partners may:

    - terminate their agreements and Genzyme General's access to the underlying
      intellectual property;

    - fail to devote significant financial or other resources to the alliances
      and thereby significantly hinder or delay development, manufacturing or
      commercialization activities; and

    - fail to successfully develop or commercialize any products.

    If any of these alliances are terminated and Genzyme General loses access to
the underlying intellectual property, or if Genzyme General and its partners are
unable to successfully develop or commercialize products, the growth potential
of Genzyme General's future earnings will be limited.

                                       8
<PAGE>
    OUR AND GENZYME GENERAL'S REPORTED FINANCIAL RESULTS WILL SUFFER DUE TO THE
    IMPACT OF AMORTIZING GOODWILL AND OTHER INTANGIBLES.

    On December [14], 2000, we completed our acquisition of GelTex
Pharmaceuticals, Inc. Under U.S. generally accepted accounting principles, we
will be accounting for our acquisition of GelTex Pharmaceuticals using the
purchase method of accounting. Under purchase accounting, the aggregate purchase
price is allocated among acquired tangible and intangible assets and liabilities
based on their estimated fair values. We currently estimate that the amount of
purchase cost allocated to goodwill and other intangibles will be approximately
$[932.7] million and will be amortized over 5 to 15 years. We will allocate this
expense to Genzyme General. As a result, using the purchase method of accounting
will decrease the reported net income of Genzyme General and Genzyme Corporation
which could have a material adverse effect on the market value of Genzyme
General Stock.

    On December [19], 2000 we completed our acquisition of Biomatrix, Inc. This
acquisition will also be accounted for using the purchase method of accounting,
with the associated amortization expense allocated to Genzyme Biosurgery. Our
acquisition of Biomatrix, together with our acquisition of GelTex
Pharmaceuticals, will have a significant impact on our reported net income.
Furthermore, if we, at some point in the future, exercise our right to exchange
Genzyme General Stock for Genzyme Biosurgery Stock, the amortization costs
associated with both the GelTex Pharmaceuticals and Biomatrix transactions would
be allocated to Genzyme General's reported net income, which would further
decrease Genzyme General's reported net income and which could have a material
adverse effect on the market value of Genzyme General Stock.

                           RISKS RELATING TO GENZYME

    The following risk factors relate to us generally and affect all of our
divisions, including Genzyme General. Holders of Genzyme General Stock are
stockholders of Genzyme and are, therefore, subject to all of our risks and
uncertainties, not just those of Genzyme General. Liabilities or contingencies
of our divisions other than Genzyme General that affect our resources or
financial condition could affect the financial condition or results of
operations of Genzyme General. Therefore, you should consider carefully these
risk factors before investing in our stock.

    GOVERNMENT REGULATION IMPOSES SIGNIFICANT COSTS AND RESTRICTIONS ON THE
    DEVELOPMENT AND COMMERCIALIZATION OF OUR PRODUCTS AND SERVICES.

    Our success will depend on our ability to satisfy regulatory requirements.
We may not receive the required regulatory approvals on a timely basis or at
all. Government agencies heavily regulate the production and sale of healthcare
products and the provision of healthcare services. In particular, the FDA and
comparable agencies in foreign countries must approve human therapeutic and
diagnostic products before they are marketed. This approval process can involve
lengthy and detailed laboratory and clinical testing, sampling activities and
other costly and time-consuming procedures. This regulation may delay the time
at which a company like us can first sell a product or may limit how a consumer
may use a product or service or may adversely impact third-party reimbursement.
A company's failure to comply with applicable regulatory approval requirements
may lead regulatory authorities to take action against the company, including:

    - issuing warning letters;

    - issuing fines and other civil penalties;

    - suspending regulatory approvals;

    - refusing approval of pending applications or supplements to approved
      applications;

    - suspending product sales in the United States and/or exports from the
      United States;

                                       9
<PAGE>
    - recalling products; and

    - seizing products.

    Furthermore, therapies that have received regulatory approval for commercial
sale may continue to face regulatory difficulties. The FDA and comparable
foreign regulatory agencies, for example, may require post-marketing clinical
trials or patient outcome studies. In addition, regulatory agencies subject a
marketed therapy, its manufacturer and the manufacturer's facilities to
continual review and periodic inspections. The discovery of previously unknown
problems with a therapy, the therapy's manufacturer or the facility used to
produce the therapy could prompt a regulatory authority to impose restrictions
on the therapy, manufacturer or facility, including withdrawal of the therapy
from the market.

    LEGISLATIVE CHANGES MAY ADVERSELY IMPACT OUR BUSINESS.

    The FDA has designated some of our products, including Cerezyme enzyme, as
orphan drugs under the Orphan Drug Act. The Orphan Drug Act provides incentives
to manufacturers to develop and market drugs for rare diseases, generally by
entitling the first developer that receives FDA marketing approval for an orphan
drug to a seven-year exclusive marketing period in the United States for that
product. In recent years Congress has considered legislation to change the
Orphan Drug Act to shorten the period of automatic market exclusivity and to
grant marketing rights to simultaneous developers of the drug. If the Orphan
Drug Act is amended in this manner, Cerezyme enzyme, as well as any other drugs
for which we have been granted exclusive marketing rights under the Orphan Drug
Act, will face increased competition which may decrease the amount of revenue we
receive from these products.

    In addition, the U.S. government has shown significant interest in pursuing
healthcare reform. Any government-adopted reform measures could adversely
affect:

    - the pricing of therapeutic products and medical devices in the United
      States or internationally; and

    - the amount of reimbursement available from governmental agencies or other
      third-party payers.

    If the U.S. government significantly reduces the amount we may charge for
our products, or the amount of reimbursement available for purchases of our
products declines, our future revenues may decline and we may need to revise our
research and development programs.

    THE DEVELOPMENT OF OUR PRODUCTS INVOLVES A LENGTHY AND COMPLEX PROCESS, AND
    WE MAY BE UNABLE TO COMMERCIALIZE ANY OF THE PRODUCTS WE ARE CURRENTLY
    DEVELOPING.

    Before we can commercialize our development-stage products, we will need to:

    - conduct substantial research and development;

    - undertake preclinical and clinical testing; and

    - pursue regulatory approvals.

    This process involves a high degree of risk and takes several years. Our
product development efforts may fail for many reasons, including:

    - failure of the product in preclinical studies;

    - clinical trial data that is insufficient to support the safety or
      effectiveness of the product; or

    - our failure to obtain the required regulatory approvals.

    For these reasons, and others, we may not successfully commercialize any of
the products we are currently developing.

                                       10
<PAGE>
    ANY MARKETABLE PRODUCTS THAT WE DEVELOP MAY NOT BE COMMERCIALLY SUCCESSFUL.

    Even if we obtain regulatory approval for any of our development-stage
products, those products may not be accepted by the market or approved for
reimbursement by third-party payers. A number of factors may affect the rate and
level of market acceptance of these products, including:

    - regulation by the FDA and other government authorities;

    - market acceptance by doctors and hospital administrators;

    - the effectiveness of our sales force;

    - the effectiveness of our production and marketing capabilities;

    - the success of competitive products; and

    - the availability and extent of reimbursement from third-party payers.

    If our products fail to achieve market acceptance, our profitability and
financial condition will suffer.

    WE WILL REQUIRE SIGNIFICANT ADDITIONAL FINANCING WHICH MAY NOT BE AVAILABLE
    ON FAVORABLE TERMS, IF AT ALL.

    As of September 30, 2000, we had approximately $808.3 million in cash, cash
equivalents and short- and long-term investments, excluding investments in
equity securities.

    Although we currently have substantial cash resources and positive cash
flow, we intend to use substantial portions of our available cash for:

    - product development and marketing;

    - expanding facilities and staff;

    - working capital; and

    - strategic business initiatives.

    In addition, we expect to pay:

    - approximately $245.0 million in cash to stockholders of Biomatrix in
      connection with our acquisition of that company during December 2000;

    - approximately $509.4 million in cash to stockholders of GelTex
      Pharmaceuticals in connection with our acquisition of that company during
      December 2000; and

    - approximately $26.0 million in cash to the limited partners of Genzyme
      Development Partners, L.P. in connection with our acquisition of the
      limited partnership interests in that partnership.

    We will further reduce available cash reserves to pay principal and interest
on the following debt:

    - In May 1998, we issued $250.0 million in convertible notes, the entire
      principal amount of which is allocated to Genzyme General. These
      convertible notes bear interest at an annual rate of 5 1/4% and mature on
      June 1, 2005. However, the holders of these notes may exchange principal
      on the notes for shares of Genzyme General Stock, Molecular Oncology Stock
      and Biosurgery Stock.

    - [As of December   , 2000, we owed approximately $      million under a
      revolving credit facility with a group of commercial banks. We have
      allocated to Genzyme General $      million of this amount, which
      represents additional funds borrowed to finance a portion of the cash
      consideration for our acquisition of GelTex Pharmaceuticals, and we have
      allocated to Genzyme Biosurgery $      million of this amount, which
      represents $18.0 million originally allocated to Genzyme Tissue Repair and
      $  million which represents additional funds borrowed

                                       11
<PAGE>
      to finance a portion of the cash consideration for our acquisition of
      Biomatrix. Amounts borrowed under this revolving credit facility bear
      interest at             . We must repay all borrowings under this facility
      by             .]

    - In August 1998, we issued $21.2 million in convertible debentures, the
      entire principal amount of which is allocated to Genzyme General. These
      convertible debentures bear interest at an annual rate of 5% and mature on
      August 29, 2003, but the holders of these convertible debentures may
      exchange principal, and under some circumstances interest, on the
      convertible debentures for shares of Genzyme General Stock.

    If we use cash to pay or redeem all or a portion of this debt, including the
principal and interest due on it, our cash reserves will be diminished. To
satisfy these and other commitments, we will have to obtain additional
financing. We may be unable to obtain any additional financing, extend any
existing financing arrangement, or obtain either on terms that we consider
favorable.

    WE MAY FAIL TO PROTECT ADEQUATELY OUR PROPRIETARY TECHNOLOGY, WHICH WOULD
    ALLOW COMPETITORS TO TAKE ADVANTAGE OF OUR RESEARCH AND DEVELOPMENT EFFORTS.

    Our long-term success largely depends on our ability to market
technologically competitive products. If we fail to obtain or maintain these
protections we may not be able to prevent third parties from using our
proprietary rights.

    Our currently pending or future patent applications may not result in issued
patents. In the United States, patent applications are confidential until
patents issue, and because third parties may have filed patent applications for
technology covered by our pending patent applications without us being aware of
those applications, our patent applications may not have priority over any
patent applications of others. In addition, our issued patents may not contain
claims sufficiently broad to protect us against third parties with similar
technologies or products or provide us with any competitive advantage. If a
third party initiates litigation regarding our patents, our collaborators'
patents, or those patents for which we have license rights, and is successful, a
court could revoke our patents or limit the scope of coverage for those patents.

    The U.S. Patent and Trademark Office, commonly referred to as the USPTO, and
the courts have not consistently treated the breadth of claims allowed in
biotechnology patents. If the USPTO or the courts begin to allow broader claims,
the incidence and cost of patent interference proceedings and the risk of
infringement litigation will likely increase. On the other hand, if the USPTO or
the courts begin to allow narrower claims, the value of our proprietary rights
may be limited. Any changes in, or unexpected interpretations of, the patent
laws may adversely affect our ability to enforce our patent position.

    We also rely upon trade secrets, proprietary know-how and continuing
technological innovation to remain competitive. We protect this information with
reasonable security measures, including the use of confidentiality agreements
with our employees, consultants and corporate collaborators. It is possible that
these individuals will breach these agreements and that any remedies for a
breach will be insufficient to allow us to recover our costs. Furthermore, our
trade secrets, know-how and other technology may otherwise become known or be
independently discovered by our competitors.

    WE MAY BE REQUIRED TO LICENSE TECHNOLOGY FROM COMPETITORS IN ORDER TO
    DEVELOP AND COMMERCIALIZE SOME OF OUR PRODUCTS AND SERVICES, AND IT IS
    UNCERTAIN WHETHER THESE LICENSES WILL BE AVAILABLE.

    Third-party patent rights may cover some of the products that we or our
strategic partners are developing or testing. As a result, we or our strategic
collaborators may be required to obtain licenses from the holders of these
patents in order to use, manufacture or sell these products and services, and
payments under these licenses may reduce our revenue from these products.
Furthermore, we may not be able to obtain these licenses on acceptable terms or
at all. If we fail to obtain a required license or

                                       12
<PAGE>
are unable to alter the design of our technology to fall outside of a patent, we
may be unable to effectively market some of our technology and services, which
could limit our profitability.

    WE MAY INCUR SUBSTANTIAL COSTS AS A RESULT OF LITIGATION OR OTHER
    PROCEEDINGS RELATING TO PATENT AND OTHER INTELLECTUAL PROPERTY RIGHTS.

    A third party may sue us or one of our strategic collaborators for
infringing the third-party's patent rights. Likewise, we or one of our strategic
collaborators may need to resort to litigation to enforce our patent rights or
to determine the scope and validity of third-party proprietary rights. For
example, we filed a lawsuit on July 25, 2000 seeking injunctive relief and
damages against Transkaryotic Therapies, Inc. in the U.S. District Court in
Wilmington, Delaware for patent infringement resulting from Transkaryotic
Therapies' manufacture and use of Replagal-TM-, its replacement therapy for
Fabry disease. The suit alleges infringement of U.S. Patent No. 5,356,804, which
we exclusively licensed from Mount Sinai School of Medicine. The patent is
directed to methods of making alpha-galactosidase in mammalian cells, as well as
the genetically-engineered cells themselves. On September 19, 2000,
Transkaryotic Therapies filed a lawsuit against us and Mount Sinai School of
Medicine in the U.S. District Court in Boston, Massachusetts seeking declaratory
judgments that the manufacture, use and sale of Replagal-TM- does not infringe
the patent we license from Mount Sinai and that the Mount Sinai patent is
invalid.

    The cost to us of any litigation or other proceeding relating to
intellectual property rights, even if resolved in our favor, could be
substantial, and the litigation would divert our management's efforts. Some of
our competitors may be able to sustain the costs of complex patent litigation
more effectively than we can because they have substantially greater resources.
If we do not prevail, we or our strategic collaborators may be required to:

    - pay monetary damages;

    - stop commercial activities relating to the affected products or services;

    - obtain a license in order to continue manufacturing or marketing the
      affected products or services; or

    - compete in the market with a substantially similar product.

    Uncertainties resulting from the initiation and continuation of any
litigation could limit our ability to continue our operations. In addition, a
court may require us to pay expenses or damages and litigation could disrupt our
commercial activities.

    WE MAY BE LIABLE FOR PRODUCT LIABILITY CLAIMS NOT COVERED BY INSURANCE.

    Individuals who use our products or services, including those we acquire in
business combinations, may bring product liability claims against us or our
subsidiaries. While we have taken, and continue to take, what we believe are
appropriate precautions, we may be unable to avoid significant liability
exposure. We have only limited amounts of product liability insurance, which may
not provide sufficient coverage against any product liability claims. We may be
unable to obtain additional insurance in the future, or we may be unable to do
so on acceptable terms. Any additional insurance we do obtain may not provide
adequate coverage against any asserted claims. In addition, regardless of merit
or eventual outcome, product liability claims may result in:

    - diversion of management's time and attention;

    - expenditure of large amounts of cash on legal fees, expenses and payment
      of damages;

    - decreased demand for our products and services; and

    - injury to our reputation.

                                       13
<PAGE>
    GENZYME BIOSURGERY FACES LITIGATION THAT COULD HAVE A MATERIAL ADVERSE
    EFFECT ON OUR BUSINESS, FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

    On July 21 and August 7, 15, and 30, 2000, class action lawsuits requesting
unspecified damages were filed in the United States District Court for the
District of New Jersey against Biomatrix and two of its officers and directors,
Endre A. Balazs and Rory B. Riggs. In these actions, the plaintiffs seek to
certify a class of all persons or entities who purchased or otherwise acquired
Biomatrix common stock during the period between July 20, 1999 and April 25,
2000. The plaintiffs allege, among other things, that the defendants failed to
accurately disclose information related to Synvisc during the period between
July 20, 1999 and April 25, 2000, and assert causes of action under the Exchange
Act and Rule 10b-5 promulgated under that Act. As part of our acquisition of
Biomatrix, Genzyme Biosurgery succeeded to these lawsuits. We disagree with
these claims and believe that information related to Synvisc was properly
disclosed. We intend to continue in the defense against those actions. However,
we can give no assurance as to the outcome of the matters. It is possible that
we may be required to pay substantial damages or settlement costs to the extent
that those damages or settlement costs are not covered by insurance. Regardless
of the outcome of the actions, these actions may cause a diversion of our
management time and attention. Under Biomatrix's charter, officers and directors
of Biomatrix were entitled to indemnification for these types of claims from
Biomatrix to the full extent permitted by Delaware law, and as part of our
acquisition of Biomatrix, Genzyme Biosurgery agreed to honor these
indemnification obligations of Biomatrix. [Mr. Riggs is currently employed by
Genzyme Biosurgery].

    OUR COMPETITORS IN THE BIOTECHNOLOGY AND PHARMACEUTICAL INDUSTRIES MAY HAVE
    SUPERIOR PRODUCTS, MANUFACTURING CAPABILITIES OR MARKETING POSITION.

    The human healthcare products and services industry is extremely
competitive. Our competitors include major pharmaceutical companies and other
biotechnology companies. Some of these competitors may have more extensive
research and development, marketing and production capabilities. Some
competitors also may have greater financial resources than we do.

    Our future success will depend on our ability to develop and market
effectively our products against those of our competitors. For instance, we are
seeking orphan drug designation for some of our products that are still in
development or are currently being reviewed by the FDA for marketing approval,
including Fabrazyme enzyme for the treatment of Fabry disease. We are aware of
other companies developing products for the treatment of Fabry disease.
Transkaryotic Therapies Inc., for example, submitted its application for
marketing approval for its product to the FDA approximately one week before we
submitted our application for Fabrazyme enzyme. If Transkaryotic Therapies or
any other company receives FDA approval for a Fabry disease therapy with orphan
drug designation before we receive FDA approval for Fabrazyme enzyme, the Orphan
Drug Act may preclude us from selling Fabrazyme enzyme in the United States for
up to seven years. If our products receive marketing approval but cannot compete
effectively in the marketplace, our profitability and financial position will
suffer.

    IF WE ARE UNABLE TO KEEP UP WITH RAPID TECHNOLOGICAL CHANGES, OUR PRODUCTS
    OR SERVICES MAY BECOME OBSOLETE.

    The field of biotechnology is characterized by significant and rapid
technological change. Although we attempt to expand our technological
capabilities in order to remain competitive, research and discoveries by others
may make our products or services obsolete. For example, some of our competitors
may develop a product to treat Gaucher disease that is more effective or less
expensive than Cerezyme enzyme. If we cannot compete effectively in the
marketplace, our profitability and financial position will suffer.

                                       14
<PAGE>
    IF WE FAIL TO OBTAIN ADEQUATE LEVELS OF REIMBURSEMENT FOR OUR PRODUCTS FROM
    THIRD-PARTY PAYERS, THE COMMERCIAL POTENTIAL OF OUR PRODUCTS WILL BE
    SIGNIFICANTLY LIMITED.

    A substantial portion of our revenue comes from payments by third-party
payers, including government health administration authorities and private
health insurers. As a result of the trend toward managed healthcare in the
United States, as well as legislative proposals to reduce payments under
government insurance programs, third-party payers are increasingly attempting to
contain healthcare costs by:

    - challenging the prices charged for healthcare products and services;

    - limiting both coverage and the amount of reimbursement for new therapeutic
      products;

    - denying or limiting coverage for products that are approved by the FDA,
      but are considered experimental or investigational by third-party payers;
      and

    - refusing in some cases to provide coverage when an approved product is
      used for disease indications in a way that has not received FDA marketing
      approval.

    Government and other third-party payers may not provide adequate insurance
coverage or reimbursement for our products and services, which could impair our
financial results. In addition, third-party payers may not reimburse patients
for newly approved healthcare products, which could decrease demand for our
products.

    Furthermore, Congress occasionally has discussed implementing broad-based
measures to contain healthcare costs. It is possible that Congress will enact
legislation specifically designed to contain healthcare costs. If third-party
reimbursement is inadequate to allow us to recover our costs or if Congress
passes legislation to contain healthcare costs, our profitability and financial
condition will suffer.

    CHANGES IN THE ECONOMIC, POLITICAL, LEGAL AND BUSINESS ENVIRONMENTS IN THE
    FOREIGN COUNTRIES IN WHICH WE DO BUSINESS COULD CAUSE OUR INTERNATIONAL
    SALES AND OPERATIONS, WHICH ACCOUNT FOR A SIGNIFICANT PERCENTAGE OF OUR
    CONSOLIDATED NET SALES, TO BE LIMITED OR DISRUPTED.

    Our international operations accounted for 41% of our consolidated revenues
for each of the years ended December 31, 1999 and 1998 and 37% of our
consolidated revenues in 1997, and we expect that international sales will
continue to account for a significant percentage of our revenues for the
foreseeable future. In addition, we have direct investments in a number of
subsidiaries outside of the United States, primarily in Europe and Japan. Our
international sales and operations could be limited or disrupted, and the value
of our direct investments may be diminished, by any of the following:

    - fluctuations in currency exchange rates;

    - the imposition of governmental controls;

    - less favorable intellectual property or other applicable laws;

    - the inability to obtain any necessary foreign regulatory approvals of
      products in a timely manner;

    - import and export license requirements;

    - political instability;

    - trade restrictions;

    - changes in tariffs;

    - difficulties in staffing and managing international operations; and

    - longer payment cycles.

                                       15
<PAGE>
    A significant portion of our business is conducted in currencies other than
our reporting currency, the U.S. dollar. We recognize foreign currency gains or
losses arising from our operations in the period in which we incur those gains
or losses. As a result, currency fluctuations among the U.S. dollar and the
currencies in which we do business have caused foreign currency transaction
gains and losses in the past and will likely do so in the future. Because of the
number of currencies involved, the variability of currency exposures and the
potential volatility of currency exchange rates, we may suffer significant
foreign currency transaction losses in the future due to the effect of exchange
rate fluctuations on our future operating results.

    SEVERAL ANTI-TAKEOVER PROVISIONS MAY DEPRIVE OUR STOCKHOLDERS OF THE
    OPPORTUNITY TO RECEIVE A PREMIUM FOR THEIR SHARES UPON A CHANGE IN CONTROL.

    Provisions of Massachusetts law and our charter, by-laws and shareholder
rights plan could delay or prevent a change in control of Genzyme or a change in
our management. Our tracking stock structure may also deprive our stockholders
of the opportunity to receive a premium for their shares upon a change in
control because, in order to obtain control of a particular division, an
acquiror would have to obtain control of the entire corporation.

    In addition, our board of directors may, in its sole discretion:

    - exchange shares of Molecular Oncology Stock or Biosurgery Stock, for
      Genzyme General Stock at a 30% premium over the market value of the
      exchanged shares; and

    - issue shares of undesignated preferred stock from time to time in one or
      more series.

    Either of these board actions could increase the cost of an acquisition of
Genzyme and thus discourage a takeover attempt.

    CONTRACT MANUFACTURERS, SUPPLIERS AND LICENSORS MAY TERMINATE THEIR
    ARRANGEMENTS WITH GELTEX PHARMACEUTICALS, INC. OR DEMAND NEW ARRANGEMENTS AS
    A RESULT OF OUR ACQUISITION OF GELTEX PHARMACEUTICALS, INC.

    On December [14], 2000, we completed our acquisition of GelTex
Pharmaceuticals, Inc. GelTex Pharmaceuticals is now a wholly-owned subsidiary of
ours and GelTex Pharmaceuticals' contract manufacturers, suppliers and licensors
are indirectly our contract manufacturers, suppliers and licensors. For
competitive or other reasons, some of these entities may choose to terminate
their arrangements with GelTex Pharmaceuticals rather than conduct business with
us. Alternatively, they may demand new arrangements with us. If we are unable to
maintain relationships on favorable terms with some or all of these contract
manufacturers, suppliers or licensors, our future results may be negatively
impacted.

                                       16
<PAGE>
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    This prospectus contains forward-looking statements about our financial
condition, results of operations, business strategies, operating efficiencies,
competitive positions, growth opportunities for existing products, future
success of development-stage products, plans and objectives of management and
other matters. These forward-looking statements involve a number of risks and
uncertainties that could cause actual results to differ materially from those
suggested by the forward-looking statements. Forward-looking statements,
therefore, should be considered in light of all of the information included or
referred to in this prospectus, including the information set forth under the
heading "RISK FACTORS" beginning on page 4.

    Words such as "estimate," "project," "plan," "intend," "expect," "believe,"
"anticipate," "should," "may," "will" and similar expressions are intended to
identify forward-looking statements. These forward-looking statements are found
at various places throughout this prospectus and the documents incorporated by
reference.

    You are cautioned not to place undue reliance on these forward-looking
statements, which speak only as of the date of this prospectus.

                              PLAN OF DISTRIBUTION

    In connection with our acquisition of GelTex Pharmaceuticals, Inc., and
pursuant to the Agreement and Plan of Merger by and among us, GelTex
Pharmaceuticals and Titan Acquisition Corp. dated as of September 11, 2000, as
amended, we have agreed to assume all of the outstanding options and warrants of
GelTex Pharmaceuticals, including:

    - options and warrants assumed by GelTex Pharmaceuticals in connection with
      its acquisition of SunPharm Corporation;

    - options granted to former directors of GelTex Pharmaceuticals pursuant to
      stock option plans maintained by GelTex Pharmaceuticals; and

    - options granted outside of the stock option plans maintained by GelTex
      Pharmaceuticals.

    On December [14], 2000, our acquisition of GelTex Pharmaceuticals became
effective and each outstanding option and warrant of GelTex Pharmaceuticals was
converted into the right to purchase shares of Genzyme General Stock. This
prospectus covers the shares of Genzyme General Stock that are issuable upon
exercise of the options and warrants specifically described in the three bullet
points above. We are offering these shares of Genzyme General Stock directly to
the holders of these options and warrants pursuant to the terms of their option
and warrant agreements. We are not using an underwriter in connection with this
offering. These shares will be listed for trading on the Nasdaq National Market.

    In order to facilitate the exercise of these options and warrants, we will
furnish, at our expense, a reasonable number of copies of this prospectus to
each recordholder of options and/or warrants as the holder may request, together
with instructions that those copies be delivered to the beneficial owners of
these options and warrants.

    The exercise price and other terms of the options and warrants described in
the three bullet points above were determined either (1) by negotiations between
SunPharm Corporation and the individual option and warrant holders or (2) by the
board of directors or a committee of the board of directors of GelTex
Pharmaceuticals. Except for the exercise price and number of shares issuable
upon exercise, which have been adjusted according to the exchange rate
applicable to our acquisition of GelTex Pharmaceuticals, these options and
warrants will continue to have, and be subject to, the same terms and conditions
that were in effect immediately before our acquisition of GelTex Pharmaceuticals

                                       17
<PAGE>
became effective. Accordingly, these terms and conditions may not necessarily
bear any relationship to our assets or results of operations.

    This prospectus forms a part of a registration statement that we have filed
with the Securities and Exchange Commission. We will bear the expenses of
preparing and filing the registration statement and currently estimate that the
total amount of these expenses will be approximately $17,000.

                                USE OF PROCEEDS

    The exercise prices of the options and warrants whose underlying shares are
covered by this prospectus range from $3.03 to $74.60 per share of Genzyme
General Stock. The following table describes the total number of shares of
Genzyme General Stock that would be issued and the total cash proceeds that we
would receive if all of these options and warrants were exercised in full:

<TABLE>
<CAPTION>
                                                TOTAL SHARES OF GENZYME GENERAL   TOTAL CASH PROCEEDS UPON
                                                 STOCK ISSUABLE UPON EXERCISE         EXERCISE IN FULL
                                                -------------------------------   ------------------------
<S>                                             <C>                               <C>
SUNPHARM OPTIONS AND WARRANTS.................               83,470                      $2,867,494
OPTIONS GRANTED TO FORMER GELTEX DIRECTORS....               34,902                      $  785,422
OPTIONS GRANTED OUTSIDE OF GELTEX OPTION
  PLANS.......................................              105,721                      $3,877,611
TOTAL.........................................              224,093                      $7,530,528
</TABLE>

    We currently intend to use the net proceeds from any exercises of these
options or warrants for working capital and general corporate purposes.

                                 LEGAL MATTERS

    The validity of the shares offered by this prospectus will be passed upon by
our counsel, Palmer & Dodge LLP, Boston, Massachusetts.

                                    EXPERTS

                    [Language to be provided by amendment.]

                                       18
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The expenses to be borne by Genzyme in connection with the registration of
the Genzyme General Division common stock are estimated as follows:

<TABLE>
<S>                                                           <C>
SEC Registration Fee........................................  $ 1,989
Printing and engraving expenses.............................  $ 1,000
Accounting fees and expenses................................  $ 5,000
Legal fees and expenses.....................................  $ 7,500
Miscellaneous expenses......................................  $ 1,511
                                                              -------
  Total.....................................................  $17,000
                                                              =======
</TABLE>

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

    Section 67 of chapter 156B of the Massachusetts Business Corporation Law
grants Genzyme the power to indemnify any director, officer, employee or agent
to whatever extent permitted by Genzyme's amended and restated articles of
organization, by-laws or a vote adopted by the holders of a majority of the
shares entitled to vote thereon, unless the proposed indemnitee has been
adjudicated in any proceeding not to have acted in good faith in the reasonable
belief that his or her actions were in the best interests of Genzyme or, to the
extent that the matter for which indemnification is sought relates to service
with respect to an employee benefit plan, in the best interests of the
participants or beneficiaries of such employee benefit plan. Such
indemnification may include payment by Genzyme of expenses incurred in defending
a civil or criminal action or proceeding in advance of the final disposition of
such action or proceeding, upon receipt of an undertaking by the person
indemnified to repay such payment if he or she shall be adjudicated to be not
entitled to indemnification under the statute.

    Article VI of Genzyme's by-laws provides that Genzyme shall, to the extent
legally permissible, indemnify each person who may serve or who has served at
any time as a director or officer of the corporation or of any of its
subsidiaries, or who at the request of the corporation may serve or at any time
has served as a director, officer or trustee of, or in a similar capacity with,
another organization or an employee benefit plan, against all expenses and
liabilities (including counsel fees, judgments, fines, excise taxes, penalties
and amounts payable in settlements) reasonably incurred by or imposed upon such
person in connection with any threatened, pending or completed action, suit or
other proceeding, whether civil, criminal, administrative or investigative, in
which he or she may become involved by reason of his or her serving or having
served in such capacity (other than a proceeding voluntarily initiated by such
person unless he or she is successful on the merits, the proceeding was
authorized by the corporation or the proceeding seeks a declaratory judgment
regarding his or her own conduct); PROVIDED that no indemnification shall be
provided for any such person with respect to any matter as to which he or she
shall have been finally adjudicated in any proceeding not to have acted in good
faith in the reasonable belief that his or her action was in the best interests
of Genzyme or, to the extent such matter relates to service with respect to any
employee benefit plan, in the best interests of the participants or
beneficiaries of such employee benefit plan; and PROVIDED, FURTHER, that as to
any matter disposed of by a compromise payment by such person, pursuant to a
consent decree or otherwise, the payment and indemnification thereof have been
approved by Genzyme, which approval shall not unreasonably be withheld, or by a
court of competent jurisdiction. Such indemnification shall include payment by
Genzyme of expenses incurred in defending a civil or criminal action or
proceeding in advance of the final disposition of such action or proceeding,
upon receipt of an undertaking by the

                                      II-1
<PAGE>
person indemnified to repay such payment if he or she shall be adjudicated to be
not entitled to indemnification under Article VI, which undertaking may be
accepted without regard to the financial ability of such person to make
repayment.

    The indemnification provided for in Article VI is a contract right inuring
to the benefit of the directors, officers and others entitled to
indemnification. In addition, the indemnification is expressly not exclusive of
any other rights to which such director, officer or other person may be entitled
by contract or otherwise under law, and inures to the benefit of the heirs,
executors and administrators of such a person.

    Genzyme also has in place agreements with its officers and directors which
affirm Genzyme's obligation to indemnify them to the fullest extent permitted by
law and contain various procedural and other provisions which expand the
protection afforded by Genzyme's by-laws.

    Section 13(b)(1 1/2) of chapter 156B of the Massachusetts Business
Corporation Law provides that a corporation may, in its articles of
organization, eliminate a director's personal liability to the corporation and
its stockholders for monetary damages for breaches of fiduciary duty, except in
circumstances involving (i) a breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law,
(iii) unauthorized distributions and loans to insiders, and (iv) transactions
from which the director derived an improper personal benefit. Article VI.C.5. of
Genzyme's Amended and Restated Articles of Organization provides that no
director shall be personally liable to Genzyme or its stockholders for monetary
damages for any breach of fiduciary duty as a director, except to the extent
that such exculpation is not permitted under the Massachusetts Business
Corporation Law as in effect when such liability is determined.

ITEM 16.  EXHIBITS

    See Exhibit Index immediately following the signature page.

ITEM 17.  UNDERTAKINGS

    (a) The undersigned Registrant hereby undertakes:

           (1) To file, during any period in which offers or sales are being
       made, a post-effective amendment to this registration statement:

               (i) To include any prospectus required by Section 10(a)(3) of the
           Securities Act of 1933;

               (ii) To reflect in the prospectus any facts or events arising
           after the effective date of the registration statement (or the most
           recent post-effective amendment thereof) which, individually or in
           the aggregate, represent a fundamental change in the information set
           forth in the registration statement. Notwithstanding the foregoing,
           any increase or decrease in volume of securities offered (if the
           total dollar value of securities offered would not exceed that which
           was registered) and any deviation from the low or high end of the
           estimated maximum offering range may be reflected in the form of
           prospectus filed with the Commission pursuant to Rule 424(b) if, in
           the aggregate, the changes in volume and price represent no more than
           20% change in the maximum aggregate offering price set forth in the
           "Calculation of Registration Fee" table in the effective registration
           statement.

              (iii) To include any material information with respect to the plan
           of distribution not previously disclosed in the registration
           statement or any material change to such information in the
           registration statement;

                                      II-2
<PAGE>
PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or Section 15(d) of the
Securities Exchange Act of 1934 that are incorporated by reference in this
Registration Statement.

        (2) That, for the purpose of determining any liability under the
    Securities Act of 1933, each such post-effective amendment shall be deemed
    to be a new registration statement relating to the securities offered
    therein, and the offering of such securities at that time shall be deemed to
    be the initial bona fide offering thereof.

        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.

    (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in this
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

    (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the provisions referred to in Item 15 hereof, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                      II-3
<PAGE>
                                   SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements of filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Cambridge, Commonwealth of Massachusetts, as of
December 13, 2000.

<TABLE>
<S>                                                    <C>  <C>
                                                       GENZYME CORPORATION

                                                       By:             /s/ MICHAEL S. WYZGA
                                                            -----------------------------------------
                                                                         Michael S. Wyzga
                                                            SENIOR VICE PRESIDENT AND CHIEF FINANCIAL
                                                                             OFFICER
</TABLE>

                               POWER OF ATTORNEY

    We, the undersigned officers and directors of Genzyme Corporation, hereby
severally constitute and appoint Henri A. Termeer, Michael S. Wyzga, Evan M.
Lebson and Peter Wirth, and each of them singly, our true and lawful
attorneys-in-fact, with full power to them in any and all capacities, to sign
any and all amendments to this registration statement on Form S-3 (including any
pre-and post-effective amendments thereto), and any related Rule 462(b)
registration statement or amendment thereto, and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, hereby ratifying and confirming all that each of said
attorneys-in-fact may do or cause to be done by virtue hereof.

    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons in the
capacities and as of the dates indicated.

<TABLE>
<CAPTION>
                      SIGNATURE                                   TITLE
                      ---------                                   -----
<C>                                                    <S>                          <C>
                /s/ HENRI A. TERMEER
     -------------------------------------------       Principal Executive Officer  December 13, 2000
                  Henri A. Termeer                       and Director

                /s/ MICHAEL S. WYZGA
     -------------------------------------------       Principal Financial and      December 13, 2000
                  Michael S. Wyzga                       Accounting Officer

         /s/ CONSTANTINE E. ANAGNOSTOPOULOS
     -------------------------------------------       Director                     December 13, 2000
           Constantine E. Anagnostopoulos

              /s/ DOUGLAS A. BERTHIAUME
     -------------------------------------------       Director                     December 13, 2000
                Douglas A. Berthiaume

                 /s/ HENRY E. BLAIR
     -------------------------------------------       Director                     December 13, 2000
                   Henry E. Blair
</TABLE>

                                      II-4
<PAGE>

<TABLE>
<CAPTION>
                      SIGNATURE                                   TITLE
                      ---------                                   -----
<C>                                                    <S>                          <C>
               /s/ ROBERT J. CARPENTER
     -------------------------------------------       Director                     December 13, 2000
                 Robert J. Carpenter

                /s/ CHARLES L. COONEY
     -------------------------------------------       Director                     December 13, 2000
                  Charles L. Cooney

                 /s/ VICTOR J. DZAU
     -------------------------------------------       Director                     December 13, 2000
                   Victor J. Dzau
</TABLE>

                                      II-5
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
       EXHIBIT
         NO.                                    DESCRIPTION
       -------          ------------------------------------------------------------
<C>                     <S>
         4.1            Amended and Restated Articles of Organization of Genzyme, as
                        amended. Filed as Exhibit 1 to Genzyme's Current Report on
                        Form 8-K filed with the Commission on June 30, 2000, and
                        incorporated herein by reference.

         4.2            By-laws of Genzyme, as amended. Filed as Exhibit 3.2 to
                        Genzyme's Quarterly Report on Form 10-Q for the quarter
                        ended September 30, 1999, and incorporated herein by
                        reference.

         4.3            Indenture, dated as of May 22, 1998, between Genzyme and
                        State Street Bank and Trust Company, as Trustee, including
                        the form of Note. Filed as Exhibit 4.3 to Genzyme's
                        Registration Statement on Form S-3 (File No. 333-59513) and
                        incorporated herein by reference.

         4.4            Registration Rights Agreement, dated as of May 19, 1998,
                        among Genzyme, Credit Suisse First Boston Corporation,
                        Goldman, Sachs & Co. and Cowen & Company. Filed as
                        Exhibit 4.4 to Genzyme's Registration Statement on Form S-3
                        (File No. 333-59513) and incorporated herein by reference.

         4.5            Purchase Agreement, dated as of May 19, 1998, among Genzyme,
                        Credit Suisse First Boston Corporation, Goldman, Sachs & Co.
                        and Cowen & Company. Filed as Exhibit 4.5 to Genzyme's
                        Registration Statement on Form S-3 (File No. 333-59513) and
                        incorporated herein by reference.

         4.6            Amended and Restated Renewed Rights Agreement dated as of
                        June 10, 1999 between Genzyme and American Stock Transfer
                        and Trust Company. Filed as Exhibit 4 to Amendment No. 1 to
                        Genzyme's Registration Statement on Form 8-A dated June 11,
                        1999, and incorporated herein by reference.

         4.7            Warrant issued to Richard Warren, Ph.D. Filed as Exhibit 4
                        to the Current Report on Form 8-K of IG Laboratories, Inc.
                        dated October 11, 1990 (File No. 0-18439), and incorporated
                        herein by reference.

         4.8            Form of Genzyme General Division Convertible Debenture dated
                        August 29, 1998, including a schedule with respect thereto
                        filed pursuant to Instruction 2 to Item 601 of
                        Regulation S-K. Filed as Exhibit 4.15 to Genzyme's
                        Registration Statement on Form S-3 (File No. 333-64901) and
                        incorporated herein by reference.

         4.9            Registration Rights Agreement dated as of August 29, 1997 by
                        and among Genzyme and the entities listed on the signature
                        pages thereto. Filed as Exhibit 10.8 to Genzyme's Quarterly
                        Report on Form 10-Q for the quarter ended September 30,
                        1997, and incorporated herein by reference.

         4.10           Warrant Agreement between Genzyme and Comdisco, Inc. Filed
                        as Exhibit 10.22 to a General Form for Registration on
                        Form 10 of PharmaGenics, Inc. (File No. 0-20138), and
                        incorporated herein by reference.

         5              Opinion of Palmer & Dodge LLP. To be filed by amendment.

        23.1            Consent of PricewaterhouseCoopers LLP, independent
                        accountants to Genzyme. To be filed by amendment.

        23.2            Consent of Palmer & Dodge LLP (contained in Exhibit 5
                        hereto).

        24              Power of Attorney (included on signature page).
</TABLE>

                                      II-6


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