ENZON INC
10-K/A, 2000-12-04
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   ----------


                                   FORM 10-K/A


                Annual Report Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

                                   ----------

                                                                      Commission
For the fiscal year ended June 30, 2000                      File Number 0-12957


                          [GRAPHIC OMITTED] ENZON, INC.
             (Exact name of registrant as specified in its charter)

                  Delaware                                   22-2372868
        (State or other jurisdiction of                   (I.R.S. Employer
        incorporation or organization)                    Identification No.)

        20 Kingsbridge Road, Piscataway, New Jersey             08854
        (Address of principal executive offices)              (Zip Code)

        Registrant's telephone number, including area code: (732) 980-4500

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

        Securities registered pursuant to Section 12(g) of the Act:
                          Common Stock, $.01 par value
                                (Title of class)

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes _X_  No __

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

     The aggregate  market value of the Common Stock,  par value $.01 per share,
held by  non-affiliates  based upon the  reported  last sale price of the Common
Stock on September 18, 2000 was approximately $2,696,273,000. There is no market
for the Series A Cumulative Convertible Preferred Stock, the only other class of
stock outstanding.

     As of September 18, 2000, there were 41,108,120 shares of Common Stock, par
value $.01 per share, outstanding.

     The Index to Exhibits appears on page 41.

                       Documents Incorporated by Reference

     The  registrant's  definitive  Proxy  Statement  for the Annual  Meeting of
Stockholders  scheduled  to be held on  December  5, 2000,  to be filed with the
Commission  not later than 120 days after the close of the  registrant's  fiscal
year, has been  incorporated  by reference,  in whole or in part,  into Part III
Items 10, 11, 12 and 13 of this Annual Report on Form 10-K.


<PAGE>




This  amendment to the Form 10-K filed on September  28, 2000 is being filed for
the sole  purpose of  correcting  a single  typographical  error in the  balance
sheets.  Additional  paid-in  capital for the fiscal year ended June 30, 2000 is
now correctly  stated as  $250,567,774  as opposed to $50,567,774 on page F-3 of
the financial statements.


Item 8. Financial Statements and Supplementary Data

     The response to this item is submitted as a separate section of this report
commencing on Page F-1.

                                   ENZON, INC.



Dated: December 4, 2000                           by:  /S/ Peter G. Tombros
                                                       ----------------------
                                                       Peter G. Tombros
                                                       President and Chief
                                                       Executive Officer




<PAGE>



                          ENZON, INC. AND SUBSIDIARIES



                                      Index

                                                                            Page
                                                                            ----

Independent Auditors' Report                                                 F-2

Consolidated Financial Statements:
  Consolidated  Balance Sheets - June 30, 2000 and 1999                      F-3
  Consolidated Statements of Operations - Years ended
   June 30, 2000, 1999 and 1998                                              F-4
  Consolidated Statements of Stockholders' Equity -
   Years ended June 30, 2000, 1999 and 1998                                  F-5
  Consolidated  Statements of Cash Flows - Years ended
   June 30, 2000, 1999 and 1998                                              F-7
  Notes to Consolidated Financial Statements - Years
   ended June 30, 2000, 1999 and 1998                                        F-8






                                      F-1


<PAGE>

                          INDEPENDENT AUDITORS' REPORT



The Board of Directors and Stockholders
Enzon, Inc.:

We have  audited  the  consolidated  financial  statements  of Enzon,  Inc.  and
subsidiaries as listed in the accompanying  index. These consolidated  financial
statements   are  the   responsibility   of  the   Company's   management.   Our
responsibility  is  to  express  an  opinion  on  these  consolidated  financial
statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the  United  States of  America.  Those  standards  require  that we plan and
perform the audit to obtain  reasonable  assurance  about  whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

In our opinion, the consolidated  financial statements referred to above present
fairly,  in all material  respects,  the financial  position of Enzon,  Inc. and
subsidiaries  as of June 30, 2000 and 1999, and the results of their  operations
and their cash flows for each of the years in the  three-year  period ended June
30, 2000, in conformity with  accounting  principles  generally  accepted in the
United States of America.




KPMG LLP



Short Hills, New Jersey
September 5, 2000









                                       F-2


<PAGE>




                          ENZON, INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEETS
                             June 30, 2000 and 1999


<TABLE>
<CAPTION>
ASSETS                                                               2000             1999
                                                                -------------    -------------

<S>                                                             <C>              <C>
Current assets:
 Cash and cash equivalents                                      $  31,935,410    $  24,673,636
 Short-term investments                                            16,986,278               --
 Accounts receivable                                                5,442,455        4,604,847
 Inventories                                                          946,717        1,326,601
 Prepaid expenses and other current assets                          2,269,884        1,034,327
                                                                -------------    -------------

   Total current assets                                            57,580,744       31,639,411
                                                                -------------    -------------
Property and equipment                                             12,439,729       12,054,505
 Less accumulated depreciation and amortization                    10,650,859       10,649,661
                                                                -------------    -------------
                                                                    1,788,870        1,404,844
                                                                -------------    -------------
Other assets:
 Investments                                                       69,557,482           68,823
 Deposits and deferred charges                                        426,731          753,683
 Patents, net                                                         898,423        1,049,554
                                                                -------------    -------------
                                                                   70,882,636        1,872,060
                                                                -------------    -------------
   Total assets                                                 $ 130,252,250    $  34,916,315
                                                                =============    =============



LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
 Accounts payable                                               $   2,465,360    $   1,716,089
 Accrued expenses                                                   5,706,811        6,261,640
                                                                -------------    -------------
   Total current liabilities                                        8,172,171        7,977,729
                                                                -------------    -------------
Accrued rent                                                          607,914          634,390
Royalty advance - Aventis                                             510,001          728,977
                                                                -------------    -------------
                                                                    1,117,915        1,363,367
                                                                -------------    -------------
Commitments and contingencies
Stockholders' equity:
 Preferred stock-$.01 par value, authorized 3,000,000 shares;
  issued and outstanding 7,000 shares in 2000 and 107,000
  shares in 1999
  (liquidation preference aggregating $319,000 in 2000 and
    $4,659,000 in 1999)                                                    70            1,070
 Common stock-$.01 par value, authorized 60,000,000 shares;
  issued and outstanding 40,838,115 shares in 2000 and
  36,488,684 shares in 1999                                           408,381          364,886
 Additional paid-in capital                                       250,567,774      146,970,289
 Accumulated deficit                                             (130,014,061)    (121,761,026)
                                                                -------------    -------------
   Total stockholders' equity                                     120,962,164       25,575,219
                                                                -------------    -------------
   Total liabilities and stockholders' equity                   $ 130,252,250    $  34,916,315
                                                                =============    =============
</TABLE>


The  accompanying  notes are an integral  part of these  consolidated  financial
statements.

                                       F-3


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                    Years ended June 30, 2000, 1999 and 1998

<TABLE>
<CAPTION>

                                                    2000            1999            1998
                                                ------------    ------------    ------------
<S>                                             <C>             <C>             <C>
Revenues:
 Sales                                          $ 15,591,488    $ 12,855,995    $ 12,312,730
 Contract revenue                                  1,426,309         302,212       2,331,302
                                                ------------    ------------    ------------
   Total revenues                                 17,017,797      13,158,207      14,644,032
                                                ------------    ------------    ------------
Costs and expenses:
 Cost of sales                                     4,888,357       4,309,956       3,645,281
 Research and development expenses                 8,382,772       6,835,521       8,653,567
 Selling, general and administrative expenses     12,956,118       8,133,366       6,426,241
                                                ------------    ------------    ------------
   Total costs and expenses                       26,227,247      19,278,843      18,725,089
                                                ------------    ------------    ------------
    Operating loss                                (9,209,450)     (6,120,636)     (4,081,057)
                                                ------------    ------------    ------------
Other income (expense):
 Interest and dividend income                      2,943,311       1,145,009         460,922
 Interest expense                                     (4,051)         (8,348)        (13,923)
 Other                                               (36,274)         64,767          16,925
                                                ------------    ------------    ------------

                                                   2,902,986       1,201,428         463,924
                                                ------------    ------------    ------------

   Net loss                                     ($ 6,306,464)   ($ 4,919,208)   ($ 3,617,133)
                                                ============    ============    ============
Basic and diluted net loss per common share          ($ 0.17)        ($ 0.14)        ($ 0.12)
                                                ============    ============    ============
Weighted average number of common
 shares outstanding                               38,172,515      35,699,133      31,092,369
                                                ============    ============    ============
</TABLE>


The  accompanying  notes are an integral  part of these  consolidated  financial
statements.


                                       F-4


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                    Years ended June 30, 2000, 1999 and 1998

<TABLE>
<CAPTION>
                                                            Preferred  stock                             Common stock
                                                            ----------------                 -----------------------------------
                                                    Amount  Number of           Par           Amount     Number of          Par
                                                  per share   Shares           Value         per share     Shares          Value
                                                  ---------   ------           -----         ---------     ------          -----
<S>                                                <C>       <C>              <C>              <C>      <C>              <C>
Balance, July 1, 1997                                        109,000          $1,090                    30,797,735       $307,977
  Common stock issued for exercise at
   non-qualified stock options                        --          --              --            2.23       505,072          5,051
  Common stock issued on conversion of
   Series A Preferred Stock                        25.00      (2,000)            (20)          11.00         4,544             45
  Dividends issued on Series A Preferred Stock        --          --              --           11.00         2,848             29
  Common stock issued for Independent
  Directors' Stock Plan                               --          --              --            4.11        16,904            169
  Common stock issued for consulting services         --          --              --            4.77        14,250            143
  Consulting expense for issuance of stock
   options                                            --          --              --              --            --             --
   Net Loss                                           --          --              --              --            --             --
                                                           ---------      ----------                  ------------    ------------
Balance, June 30, 1998                                       107,000          $1,070                    31,341,353        $313,414

 Common stock issued for exercise of
  non-qualified stock options                         --          --              --            4.40     1,000,919         10,009
 Common stock issued on exercise of
 Common stock warrants                                --          --              --            2.50       150,000          1,500
 Net proceeds from Private Placement,
  July 1998                                           --          --              --            4.75     3,983,000         39,830
 Common stock issued for Independent
  Directors' Stock Plan                               --          --              --            8.88         8,514             84
 Common stock options and warrants issued
  for consulting services                             --          --              --              --            --             --
 Common stock issued for consulting services          --          --              --            6.13         4,898             49
 Net loss                                             --          --              --              --            --             --
                                                           ---------      ----------                  ------------   ------------
Balance, June 30, 1999, carried forward                      107,000          $1,070                    36,488,684       $364,886

<CAPTION>

                                                   Additional
                                                     paid-in       Accumulated
                                                     capital         Deficit            Total
                                                     -------         -------            -----
<S>                                               <C>             <C>                <C>
Balance, July 1, 1997                             $121,426,159    ($113,193,345)     $8,541,881
  Common stock issued for exercise at
   non-qualified stock options                       1,653,557               --       1,658,608
  Common stock issued on conversion of
   Series A Preferred Stock                                (42)              --             (17)
  Dividends issued on Series A Preferred Stock          31,300          (31,340)            (11)
  Common stock issued for Independent
  Directors' Stock Plan                                 69,231               --          69,400
  Common stock issued for consulting services           67,854               --          67,997
  Consulting expense for issuance of stock
   options                                             205,815               --         205,815
   Net Loss                                                 --       (3,617,133)     (3,617,133)
                                                 -------------    -------------    ------------
Balance, June 30, 1998                            $123,453,874    ($116,841,818)     $6,926,540

 Common stock issued for exercise of
  non-qualified stock options                        4,396,477               --       4,406,486
 Common stock issued on exercise of
 Common stock warrants                                 373,500               --         375,000
 Net proceeds from Private Placement,
  July 1998                                         17,510,265               --      17,550,095
 Common stock issued for Independent
  Directors' Stock Plan                                 75,539               --          75,623
 Common stock options and warrants issued
  for consulting services                            1,130,683               --       1,130,683
 Common stock issued for consulting services            29,951               --          30,000
 Net loss                                                   --       (4,919,208)     (4,919,208)
                                                 -------------    -------------    ------------
Balance, June 30, 1999, carried forward           $146,970,289    ($121,761,026)    $25,575,219
</TABLE>

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.

                                      F-5


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (continued)
                    Years ended June 30, 2000, 1999 and 1998

<TABLE>
<CAPTION>
                                                       Preferred  stock                     Common stock
                                                       ----------------          --------------------------------      Additional
                                                   Amount  Number of    Par       Amount      Number of      Par         paid-in
                                                 per share   Shares    Value     per share      Shares      Value        capital
                                                 ---------   ------    -----     ---------      ------      -----        -------
<S>                                               <C>      <C>        <C>         <C>       <C>            <C>        <C>
Balance, June 30, 1999, brought forward                    107,000    $ 1,070               36,488,684     $364,886   $ 146,970,289
Common stock issued for exercise of
 non-qualified stock options                       --           --         --      4.25        807,181        8,072       3,286,246
Common stock issued on conversion of
 Series A Preferred Stock                         25.00   (100,000)    (1,000)    11.00        227,271        2,273          (1,273)
Dividends issued on Series A Preferred Stock       --           --         --        --             --           --              --
Common stock issued on exercise of
 common stock warrants                             --           --         --      4.57      1,012,116       10,121       4,395,803
Net Proceeds from Common stock offering                                           44.50      2,300,000       23,000      95,647,262
Common stock issued for Independent
 Directors' Stock Plan                             --           --         --     30.82          2,863           29          88,208
Consulting expense for issuance for stock
options                                            --           --         --        --             --           --         181,239
Net loss                                           --           --         --        --             --           --              --
                                                          --------    -------               ----------     --------   -------------

Balance, June 30, 2000                                       7,000    $    70               40,838,115     $408,381   $ 250,567,774
                                                          ========    =======               ==========     ========   =============

<CAPTION>

                                                   Accumulated
                                                     Deficit            Total
                                                     -------            -----
<S>                                               <C>              <C>
Balance, June 30, 1999, brought forward            ($121,761,026)   $  25,575,219
Common stock issued for exercise of
 non-qualified stock options                                  --        3,294,318
Common stock issued on conversion of
 Series A Preferred Stock                                     --               --
Dividends issued on Series A Preferred Stock          (1,946,571)      (1,946,571)
Common stock issued on exercise of
 common stock warrants                                        --        4,405,924
Net Proceeds from Common stock offering                       --       95,670,262
Common stock issued for Independent
 Directors' Stock Plan                                        --           88,237
Consulting expense for issuance for stock
options                                                       --          181,239
Net loss                                              (6,306,464)      (6,306,464)
                                                   -------------    -------------

Balance, June 30, 2000                             ($130,014,061)   $ 120,962,164
                                                   =============    =============
</TABLE>

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.


                                       F-6
<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                    Years Ended June 30, 2000, 1999 and 1998

<TABLE>
<CAPTION>

                                                       2000             1999            1998
                                                   -------------    ------------    -----------
<S>                                                <C>              <C>             <C>
Cash flows from operating activities:
Net loss                                           ($  6,306,464)   ($ 4,919,208)   ($3,617,133)
Adjustments to reconcile net loss to net cash
 used in operating activities:
   Depreciation and amortization                         499,245         835,503      1,217,423
   Loss (gain) on retirement of assets                    36,274         (38,521)        97,037
Non-cash expense for issuance of common
   stock, warrants, and options                          269,476       1,236,306        343,212
   Changes in assets and liabilities:
(Increase) decrease  in accounts receivable             (837,608)     (2,304,801)       133,716
Decrease (increase) in inventories                       379,884        (304,071)      (162,657)
Increase in prepaid expenses and other
       current assets                                 (1,232,483)       (586,375)      (360,220)
Decrease (increase) in deposits and deferred
     charges                                             326,952        (288,936)      (430,172)
(Decrease) increase in accounts payable                  749,271           4,233       (198,881)
Increase (decrease) in accrued expenses                 (473,442)      2,691,353        796,403
Decrease in accrued rent                                 (26,476)        (92,770)      (142,852)
Decrease in royalty advance - Aventis                   (300,363)        (76,558)    (1,101,501)
                                                   -------------    ------------    -----------
       Net cash used in operating activities          (6,915,734)     (3,843,845)    (3,425,625)
                                                   -------------    ------------    -----------

Cash flows from investing activities:
Capital expenditures                                    (768,415)       (424,670)      (160,940)
Proceeds from sale of equipment                             --           131,932         83,129
 Purchase of investments                             (90,478,010)           --             --
 Maturities of investments                             4,000,000            --             --
 Decrease in long-term investments                          --               179          9,291
                                                   -------------    ------------    -----------

       Net cash used in investing activities         (87,246,425)       (292,559)       (68,520)
                                                   -------------    ------------    -----------

Cash flows from financing activities:
Proceeds from issuance of common stock and
     warrants                                        103,370,504      22,331,581      1,658,580
Preferred stock dividends paid                        (1,946,571)           --             --
Principal payments of obligations under
     capital lease                                          --              --           (1,728)
                                                   -------------    ------------    -----------
       Net cash provided by financing activities     101,423,933      22,331,581      1,656,852
                                                   -------------    ------------    -----------
       Net increase (decrease) in cash and cash
         equivalents                                   7,261,774      18,195,177     (1,837,293)
 Cash and cash equivalents at beginning of year       24,673,636       6,478,459      8,315,752
                                                   -------------    ------------    -----------

 Cash and cash equivalents at end of year          $  31,935,410    $ 24,673,636    $ 6,478,459
                                                   =============    ============    ===========

</TABLE>

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.

                                       F-7


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
                   Notes to Consolidated Financial Statements
                    Years ended June 30, 2000, 1999 and 1998


(1)  Company Overview

          Enzon, Inc. ("Enzon" or "Company") is a biopharmaceutical company that
     develops,    manufactures   and   markets    enhanced    therapeutics   for
     life-threatening  diseases  through  the  application  of  its  proprietary
     technologies. The Company was originally incorporated in 1981. To date, the
     Company's sources of cash have been the proceeds from the sale of its stock
     through public offerings and private  placements,  sales of ADAGEN(R),  and
     ONCASPAR(R),  royalties on sales of  PEG-INTRON,  sales of its products for
     research  purposes,  contract  research and  development  fees,  technology
     transfer  and license  fees and royalty  advances.  The  manufacturing  and
     marketing  of  pharmaceutical  products in the United  States is subject to
     stringent  governmental  regulation,  and the sale of any of the  Company's
     products  for use in humans in the United  States  will  require  the prior
     approval of the United  States  Food and Drug  Administration  ("FDA").  To
     date,  ADAGEN and ONCASPAR are the only  products of the Company which have
     been  approved  for  marketing  by the  FDA.  PEG-INTRON  is  approved  for
     marketing in the European Union.

(2)  Summary of Significant Accounting Policies

     Consolidated Financial Statements

          The  consolidated  financial  statements  include the  accounts of the
     Company and its wholly-owned  subsidiaries.  All intercompany  transactions
     and balances are eliminated in consolidation.  The preparation of financial
     statements in conformity  with  generally  accepted  accounting  principles
     requires  management  to make  estimates  and  assumptions  that affect the
     reported  amounts of assets and  liabilities  and  disclosure of contingent
     assets and  liabilities  at the date of the  financial  statements  and the
     reported  amounts of revenues and  expenses  during the  reporting  period.
     Actual results could differ from those estimates.

     Investments

          The Company  classifies its debt and marketable equity securities into
     held-to-maturity  or  available-for-sale  categories.  Debt  securities are
     classified as held-to-maturity  when the Company has the intent and ability
     to hold the securities to maturity.  Debt  securities for which the Company
     does not have the intent or ability to hold to maturity are  classified  as
     available  for sale.  Held-to-maturity  securities  are  recorded as either
     short-term or long-term on the balance sheet based on contractual  maturity
     date  and  are  stated  at  amortized  cost.  Debt  and  marketable  equity
     securities   not   classified  as   held-to-maturity   are   classified  as
     available-for-sale   and  are  carried  at  fair  market  value,  with  the
     unrealized gains and losses,  net of tax,  included in the determination of
     comprehensive income and reported in stockholders' equity.

          The fair value of substantially all securities is determined by quoted
     market  prices.  The estimated fair value of securities for which there are
     no quoted market  prices is based on similar  types of securities  that are
     traded in the market.  Gains or losses on securities  sold are based on the
     specific identification method.

     The amortized cost and fair value for securities  held to maturity by major
     security type at June 30, 2000 and 1999, were as follows:

<TABLE>
<CAPTION>
                                          June 30, 2000                June 30, 1999
                                          -------------                -------------
                                   Amortized      Fair Market    Amortized      Fair Market
                                      Cost           Value          Cost           Value
<S>                              <C>            <C>             <C>             <C>
     U.S. government debt        $  3,630,000   $  3,630,000    $ 7,431,000    $ 7,471,000
     U.S. corporate debt           87,881,000     87,984,000     15,267,000     15,230,000
     Foreign corporate debt        13,649,000     13,563,000

                                 ------------   ------------------------------------------
                                 $105,160,000   $105,177,000    $22,698,000    $22,701,000
                                 ============   ==========================================
</TABLE>

     Maturities  of debt  securities  classified  as held  to  maturity  were as
     follows at June 30, 2000:

     Years ended June 30,

                                        Amortized           Fair Market
                                           Cost                Value
          2001                       $ 35,668,000          $ 35,647,000
          2002                         59,484,000            59,474,000
          2003                         10,008,000            10,056,000
          2004                              --                    --
          2005 and thereafter               --                    --
                                     ------------          ------------
                                     $105,160,000          $105,177,000
                                     ============          ============

     Included in cash and cash  equivalents  were $18,681,000 of debt securities
     which mature prior to October 30, 2000.


                                       F-8


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     Inventory Costing and Idle Capacity

          Inventories  are  stated  at the  lower  of  cost or  market.  Cost is
     determined  using the first-in,  first-out  method and includes the cost of
     raw materials, labor and overhead.

          Costs  associated  with idle capacity at the  Company's  manufacturing
     facility are charged to cost of sales as incurred.

     Patents

          The Company has licensed,  and been issued, a number of patents in the
     United States and other countries and has other patent applications pending
     to protect its proprietary  technology.  Although the Company believes that
     its patents  provide  adequate  protection for the conduct of its business,
     there  can  be no  assurance  that  such  patents  will  be of  substantial
     protection  or commercial  benefit to the Company,  will afford the Company
     adequate protection from competing  products,  or will not be challenged or
     declared  invalid,  or that  additional  United  States  patents or foreign
     patent  equivalents  will be issued to the  Company.  The  degree of patent
     protection to be afforded to biotechnological  inventions is uncertain, and
     the Company's products are subject to this uncertainty.

          Patents  related to the  acquisition of SCA Ventures,  Inc.,  formerly
     Genex  Corporation,  were  recorded  at  their  fair  value  at the date of
     acquisition and are being amortized over the estimated  useful lives of the
     patents ranging from 8 to 17 years. Accumulated amortization as of June 30,
     2000 and 1999 was $1,230,000 and $1,099,000, respectively.

          Costs  related  to the  filing of patent  applications  related to the
     Company's products and technology are expensed as incurred.

     Property and Equipment

          Property and equipment are carried at cost.  Depreciation  is computed
     using the  straight-line  method.  When  assets are  retired  or  otherwise
     disposed of, the cost and related accumulated depreciation are removed from
     the accounts,  and any  resulting  gain or loss is recognized in operations
     for  the  period.  The  cost of  repairs  and  maintenance  is  charged  to
     operations  as  incurred;   significant   renewals  and   betterments   are
     capitalized.

     Long-lived Assets

          The Company reviews  long-lived assets for impairment  whenever events
     or changes in business  circumstances occur that indicate that the carrying
     amount of the assets  may not be  recoverable.  The  Company  assesses  the
     recoverability   of  long-lived  assets  held  and  to  be  used  based  on
     undiscounted  cash  flows  and  measures  the  impairment,  if  any,  using
     discounted cash flows.

     Revenue Recognition

          Reimbursement  from  third  party  payors  for ADAGEN is handled on an
     individual  basis due to the high cost of  treatment  and  limited  patient
     population. Because of the uncertainty of


                                       F-9


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     reimbursement  and  the  Company's  commitment  of  supply  to the  patient
     regardless of whether or not the Company will be  reimbursed,  revenues for
     the sale of ADAGEN are  recognized  when  reimbursement  from  third  party
     payors becomes likely.

          Revenues from the sale of the Company's  other  products that are sold
     are  recognized at the time of shipment and provision is made for estimated
     returns.

          Contract revenues are recorded as the earnings process is completed.

          Royalties  under the Company's  license  agreements with third parties
     are recognized when earned.

     Research and Development

          Research and development costs are expensed as incurred.

     Stock Compensation

          The Company  maintains a  Non-Qualified  Stock Option Plan (the "Stock
     Option  Plan") for which it applies  Accounting  Principles  Board  ("APB")
     Opinion No. 25,  "Accounting  for Stock Issued to  Employees,"  and related
     interpretations  in  accounting  for the Stock Option Plan.  Stock  options
     issued to employees are granted with an exercise  price equal to the market
     price  and in  accordance  with APB No.  25,  compensation  expense  is not
     recognized.  The Company records compensation expense equal to the value of
     stock options  granted for consulting  services  rendered to the Company by
     non-employees.  The  value  of the  options  granted  to  non-employees  is
     determined by the Black-Scholes option-pricing model.


     Cash Flow Information

          The Company  considers  all highly  liquid  securities  with  original
     maturities of three months or less to be cash equivalents.

          During  the year  ended  June 30,  2000,  100,000  shares  of Series A
     Cumulative  Convertible  Preferred  Stock  ("Series A  Preferred  Stock" or
     "Series A Preferred  Shares")  were  converted to 227,271  shares of Common
     Stock.  Accrued  dividends of $1,947,000  on the Series A Preferred  Shares
     that were  converted,  were settled by cash  payments.  Additionally,  cash
     payments  totaling  $19 were  made for  fractional  shares  related  to the
     conversions.  There were no conversions of Series A Preferred Stock for the
     year ended June 30, 1999.

          During  the year  ended  June  30,  1998,  2,000  shares  of  Series A
     Preferred  Stock were  converted to 4,544 shares of Common  Stock.  Accrued
     dividends of $31,000 on the Series A Preferred  Shares that were  converted
     were  settled by issuing  2,848  shares of Common  Stock and cash  payments
     totaling $19 for fractional shares.

          Cash  payments  for interest  were  approximately  $4,000,  $8,000 and
     $14,000 for the years  ended June 30,  2000,  1999 and 1998,  respectively.
     There were no income tax  payments  made for the years ended June 30, 2000,
     1999 and 1998.


                                      F-10


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     Net Loss Per Common Share

          Basic and diluted  loss per common  share is based on the net loss for
     the relevant period, adjusted for cumulative, undeclared Series A Preferred
     Stock dividends of $14,000,  $214,000 and $216,000 for the years ended June
     30, 2000,  1999 and 1998,  respectively,  divided by the  weighted  average
     number of shares issued and outstanding  during the period. For purposes of
     the diluted loss per share  calculation,  the exercise or conversion of all
     potential  common shares is not included because the effect is antidilutive
     due to the net loss  recorded for the years ended June 30,  2000,  1999 and
     1998.  As of  June  30,  2000,  the  Company  had  approximately  5,364,000
     potentially  dilutive  common  shares  outstanding  that could  potentially
     dilute future earnings per share calculations.

     Comprehensive Income

          Effective  July 1, 1998,  the Company  adopted  Statement of Financial
     Accounting Standards No. 130 ("SFAS 130"), Reporting  Comprehensive Income.
     SFAS  130   establishes   new  rules  for  the  reporting  and  display  of
     comprehensive  income and its  components.  The adoption of SFAS 130 had no
     impact on the Company's  results of operations for the years ended June 30,
     2000,  1999 and 1998. The net loss is equal to the  comprehensive  loss for
     those periods.

(3)  Inventories

     Inventories consist of the following:

                                                    June 30,
                                          --------------------------
                                                 2000           1999
                                                 ----           ----
             Raw materials                   $283,000       $503,000
             Work in process                  504,000        548,000
             Finished goods                   160,000        276,000
                                          -----------   ------------
                                             $947,000     $1,327,000

(4)      Property and Equipment

         Property and equipment consist of the following:


<TABLE>
<CAPTION>
                                                     June 30,
                                          --------------------------          Estimated
                                                 2000           1999         useful lives
                                                 ----           ----         ------------
<S>                                        <C>            <C>                <C>
             Equipment                     $8,356,000     $8,024,000         3-7 years
             Furniture and fixtures         1,440,000      1,438,000         7 years
             Vehicles                          24,000         24,000         3 years
             Leasehold improvements         2,619,000      2,569,000         3-15 years
                                          -----------    -----------
                                          $12,439,000    $12,055,000
                                          ===========    ===========
</TABLE>

          During the years ended June 30,  2000 and 1999,  the  Company's  fixed
     asset disposals were approximately  $383,000 and $3,504,000,  respectively.
     The  disposals  in  1999  were  primarily  attributable  to  the  Company's
     consolidation  of research  operations  and the  elimination  of its leased
     facility at 40 Cragwood Road.


                                      F-11


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


          Depreciation  and  amortization  charged  to  operations  relating  to
     property and equipment  totaled  $348,000,  $692,000 and $1,063,000 for the
     years ended June 30, 2000, 1999 and 1998, respectively.

(5)  Stockholders' Equity

          During the year ended June 30, 2000, the Company sold 2,300,000 shares
     of Common Stock in a public  offering at a gross  offering  price of $44.50
     per  share.  The  offering  resulted  in gross  proceeds  of  approximately
     $102,350,000 and net proceeds of approximately $95,670,000.

          During the year ended June 30, 1999, the Company sold 3,983,000 shares
     of Common Stock in a private  placement to a small group of investors.  The
     private placement  resulted in gross proceeds of approximately  $18,919,000
     and net proceeds of approximately $17,550,000.

          The board of  directors  has the  authority  to issue up to  3,000,000
     shares of preferred  stock, par value $0.01 per share, and to determine the
     price and terms,  including  preferences and voting rights, of those shares
     without stockholder approval.

     Series A Preferred Stock

          The Company's  Series A Preferred  Shares are convertible  into Common
     Stock at a  conversion  rate of $11 per  share.  The value of the  Series A
     Preferred Shares for conversion  purposes is $25 per share.  Holders of the
     Series A  Preferred  Shares are  entitled  to an annual  dividend of $2 per
     share, payable semiannually,  but only when and if declared by the Board of
     Directors,  out of  funds  legally  available.  Dividends  on the  Series A
     Preferred  Shares are  cumulative and accrue and accumulate but will not be
     paid,  except in  liquidation  or upon  conversion,  until such time as the
     Board of Directors  deems it  appropriate  in light of the  Company's  then
     current financial  condition.  No dividends are to be paid or set apart for
     payment on the Company's  Common Stock,  nor are any shares of Common Stock
     to be redeemed,  retired or otherwise  acquired for valuable  consideration
     unless the Company has paid in full or made  appropriate  provision for the
     payment in full of all dividends which have then  accumulated on the Series
     A Preferred  Shares.  Holders of the Series A Preferred Shares are entitled
     to one vote per share on matters to be voted  upon by the  stockholders  of
     the Company. As of June 30, 2000 and 1999,  undeclared accrued dividends in
     arrears  were  $144,000  or $20.54  and  $1,984,000  or $18.54  per  share,
     respectively.  All  Common  Shares  are  junior  in  rank to the  Series  A
     Preferred  Shares,  with  respect  to  the  preferences  as  to  dividends,
     distributions and payments upon the liquidation,  dissolution or winding up
     of the Company.





                                      F-12


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     Common Stock

          Holders of shares of Common  Stock are  entitled to one vote per share
     on matters to be voted upon by the stockholders of the Company.


     As of June 30, 2000, the Company has reserved its common shares for special
     purposes as detailed below:


     Shares issuable upon conversion of
          Series A Preferred Shares                                       29,000
     Shares issuable upon exercise of outstanding warrants               100,000
     Non-Qualified Stock Option Plan                                   5,235,000
                                                                       ---------
                                                                       5,364,000
                                                                       =========

     Common Stock Warrants

          During  the year ended  June 30,  2000,  warrants  were  exercised  to
     purchase 1,012,000 shares of the Company's Common Stock at an average price
     of $4.57  per  share.  Of this  amount,  702,000  warrants  were  issued in
     connection with our January 1996 private  placement and 134,000 were issued
     during  the  year  ended  June  30,  1999 as  compensation  for  consulting
     services.  These  exercises  resulted in net  proceeds of  $4,406,000.  The
     exercise  price of and the number of shares  issuable  under these warrants
     were adjusted under standard  anti-dilution  provisions,  as defined in the
     warrants.

          During the year ended June 30, 1999,  150,000  warrants were exercised
     to  purchase  150,000  shares of the  Company's  Common  Stock at $2.50 per
     share.  These  warrants were issued during the year ended June 30, 1996, as
     part of the commission  due to a real estate broker in connection  with the
     termination of the Company's former lease at 40 Kingsbridge Road.

          As of June 30,  2000,  warrants to purchase  100,000  shares of Common
     Stock at an average exercise price of $5.92 per share were outstanding.

          During  the year ended  June 30,  1999,  the  Company  issued  200,000
     five-year  warrants to purchase  its Common  Stock at $6.50 per share,  the
     closing  price of the Common  Stock on the date of grant.  The warrants are
     consideration for consulting services to be rendered through February 2002.
     The estimated fair value of the warrants of approximately $917,000 is being
     amortized over the service period of three years.  The unamortized  portion
     is included as a component of other assets with the  corresponding  current
     portion included in other current assets on the consolidated  balance sheet
     as of June 30, 2000 and 1999.

(6)  Independent Directors' Stock Plan

          On December 3, 1996, the  stockholders  voted to approve the Company's
     Independent  Directors'  Stock Plan, which provides for compensation in the
     form of  quarterly  grants of Common  Stock to non  executive,  independent
     directors  serving on the Company's  Board of Directors.  Each  independent
     director is granted shares of Common Stock equivalent to $2,500 per quarter
     plus $500 per Board of Director's  meeting  attended.  The number of shares
     issued  is based  on the fair  market  value  of  Common  Stock on the last
     trading day of the applicable quarter. During

                                      F-13


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     the years ended June 30, 2000,  1999 and 1998,  the Company  issued  3,000,
     9,000 and  17,000  shares of Common  Stock,  respectively,  to  independent
     directors, pursuant to the Independent Directors' Stock Plan.

(7)  Non-Qualified Stock Option Plan

          In  November  1987,  the  Company's  Board  of  Directors   adopted  a
     Non-Qualified  Stock Option Plan (the "Stock Option  Plan").  The number of
     shares  reserved for  issuance  under the  Company's  Stock Option Plan was
     increased from 6,200,000 to 7,900,000  during December 1999. As of June 30,
     2000,  5,235,000 shares of Common Stock were reserved for issuance pursuant
     to options  which may be granted to  employees,  non-employee  directors or
     consultants to the Company.  The exercise price of the options granted must
     be at least  100% of the  fair  market  value of the  stock at the time the
     option is granted. Options may be exercised for a period of up to ten years
     from the date they are  granted.  The other  terms  and  conditions  of the
     options  generally are to be  determined  by the Board of Directors,  or an
     option committee appointed by the Board, at their discretion.

          The Company has adopted the disclosure-only provisions of Statement of
     Financial  Accounting  Standards No. 123 ("SFAS No. 123"),  "Accounting for
     Stock-Based  Compensation".  The  Company  continues  to use  APB  No.  25,
     "Accounting for Stock Issued to Employees," to account for the Stock Option
     Plan.  All options  granted  under the Stock  Option Plan are granted  with
     exercise prices which equal or exceed the fair market value of the stock at
     the date of grant. Accordingly, there is no compensation expense recognized
     for options granted to employees.

          The following pro forma financial information shows the effect and the
     Company's  net loss  and loss per  share,  had  compensation  expense  been
     recognized consistent with the fair value method of SFAS No. 123.

<TABLE>
<CAPTION>
                                                         2000             1999              1998
                                                         ----             ----              ----
<S>                                                  <C>               <C>              <C>
                  Net loss - as reported              ($6,306,000)     ($4,919,000)     ($3,617,000)
                  Net loss - pro forma               ($10,008,000)     ($7,289,000)     ($5,638,000)
                  Loss per share - as reported             ($0.17)          ($0.14)          ($0.12)
                  Loss per share - pro forma               ($0.26)          ($0.21)          ($0.19)
</TABLE>

          The pro forma  effect on the loss for the three  years  ended June 30,
     2000 is not  necessarily  indicative of the pro forma effect on earnings in
     future years since it does not take into effect the pro forma  compensation
     expense  related to grants made prior to the year ended June 30, 1996.  The
     fair value of each  option  granted  during the three  years ended June 30,
     2000  is   estimated   on  the  date  of  grant  using  the   Black-Scholes
     option-pricing model with the following assumptions:  (i) dividend yield of
     0%, (ii) expected term of five years,  (iii) volatility of 84%, 86% and 84%
     and (iv) a risk-free  interest rate of 6.19%, 5.06% and 5.57% for the years
     ended June 30, 2000, 1999 and 1998, respectively. The weighted average fair
     value at the date of grant for options  granted during the years ended June
     30,  2000,   1999  and  1998  was  $33.78,   $9.68  and  $5.85  per  share,
     respectively.






                                      F-14


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     The  following is a summary of the activity in the  Company's  Stock Option
Plan:

<TABLE>
<CAPTION>
                                                                 Weighted
                                                                  Average
                                                                  Exercise         Range of
                                                   Shares          Price            Prices
                                                   ------          -----            ------
<S>                                              <C>                <C>          <C>
Outstanding at July 1, 1997                      4,197,000          3.77       $  1.88 to $14.88
 Granted at exercise prices which equaled the
 fair market value on the date of grant            719,000          5.85       $  2.03 to $ 6.56
 Exercised                                        (305,000)         2.73       $  2.06 to $ 5.13
 Canceled                                         (189,000)         6.69       $  2.09 to $14.88
                                                ----------
 Outstanding at June 30, 1998                    4,422,000          4.06       $  1.88 to $10.88

 Granted at exercise prices which equaled
  the fair market value on the date of grant       475,000          9.68       $  4.88 to $15.75
 Exercised                                      (1,001,000)         4.40       $  2.00 to $ 9.88
 Canceled                                         (172,000)         7.25       $  2.81 to $14.50
                                                ----------
 Outstanding at June 30, 1999                    3,724,000          4.51       $  1.88 to $15.75

 Granted at exercise prices which equaled
  the fair market value on the date of grant       302,000         33.78       $ 21.50 to $69.50
 Exercised                                        (809,000)        38.71       $ 20.06 to $70.75
 Canceled                                          (11,000)        20.53       $  6.00 to $37.38
                                                ----------
 Outstanding at June 30, 2000                    3,206,000          7.35       $  1.88 to $69.50
                                                ==========
</TABLE>

     As of June 30, 2000, the Plan had options  outstanding  and  exercisable by
price range as follows:

<TABLE>
<CAPTION>
                                            Weighted
                                            Average        Weighted                    Weighted
              Range of                     Remaining       Average                     Average
              Exercise         Options    Contractual      Exercise      Options       Exercise
               Prices        Outstanding      Life          Price      Exercisable      Price
               ------        -----------      ----          -----      -----------      -----
          <S>                <C>              <C>          <C>           <C>            <C>
           $1.88 - $2.69      682,000         5.89          $2.49        682,000          $2.49
           $2.75 - $2.94      626,000         5.73          $2.85        626,000          $2.85
           $3.06 - $3.56      280,000         5.37          $3.51        280,000          $3.51
           $3.75 - $5.50      509,000         4.33          $4.59        507,000          $4.59
           $5.88 - $6.50      607,000         7.73          $6.23        471,000          $6.15
           $7.50 - $22.31     311,000         8.25         $17.08         87,000         $13.83
          $24.00 - $51.56     184,000         9.02         $39.28         10,000         $32.88
          $61.00 - $69.50       7,000         9.70         $61.75             --             --
                            ---------                                  ---------      ---------
                            3,206,000         6.33          $7.35      2,663,000          $4.21
                            =========                                  =========      =========
</TABLE>

                                      F-15


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(8)  Income Taxes

          Under the asset and  liability  method of SFAS No. 109,  deferred  tax
     assets  and  liabilities  are  recognized  for  the  estimated  future  tax
     consequences   attributable  to  differences  between  financial  statement
     carrying  amounts of existing assets and  liabilities and their  respective
     tax bases.  Deferred tax assets and  liabilities are measured using enacted
     tax rates  expected to apply to taxable  income in the years in which those
     temporary  differences are expected to be recovered or settled.  Under SFAS
     No. 109, the effect on deferred tax assets and  liabilities  of a change in
     tax rates is recognized in income in the period that includes the enactment
     date.

          At June 30, 2000 and 1999,  the tax effects of  temporary  differences
     that give rise to the deferred tax assets and deferred tax  liabilities are
     as follows:
<TABLE>
<CAPTION>
                                                                               2000            1999
                                                                               ----            ----
<S>                                                                      <C>             <C>
          Deferred tax assets:
            Inventories                                                  $    603,000    $    272,000
            Investment valuation reserve                                       86,000          86,000
            Contribution carryover                                             28,000          20,000
            Compensated absences                                              157,000         127,000
            Excess of financial statement over tax depreciation               924,000       1,031,000
            Royalty advance - Aventis                                         395,000         371,000
            Non-deductible expenses                                         1,025,000       1,497,000
            Federal and state net operating loss carryforwards             50,808,000      44,531,000
            Research and development and investment tax credit
              carryforwards                                                 8,860,000       8,176,000
                                                                         ------------    ------------

            Total gross deferred tax assets                                62,886,000      56,111,000

            Less valuation allowance                                      (62,180,000)    (55,405,000)
                                                                         ------------    ------------

                    Net deferred tax assets                                   706,000         706,000
                                                                         ------------    ------------


          Deferred tax liabilities:
            Step up in basis of assets related to acquisition of Enzon
            Labs Inc.                                                        (706,000)       (706,000)
                                                                         ------------    ------------

            Total gross deferred tax liabilities                             (706,000)       (706,000)
                                                                         ------------    ------------

                  Net deferred tax                                       $          0    $          0
                                                                         ============    ============



</TABLE>


                                     F-16


<PAGE>



                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


          A valuation allowance is provided when it is more likely than not that
     some portion or all of the  deferred  tax assets will not be realized.  The
     net change in the total  valuation  allowance  for the years ended June 30,
     2000 and 1999 was an increase of $6,775,000 and  $4,428,000,  respectively.
     The tax benefit  assumed  using the Federal  statutory  tax rate of 34% has
     been  reduced  to  an  actual  benefit  of  zero  due  principally  to  the
     aforementioned valuation allowance. Subsequently recognized tax benefits as
     of June 30, 2000 of  $3,540,000  relating to the  valuation  allowance  for
     deferred tax assets will be allocated to additional paid-in capital.

          At  June  30,  2000,  the  Company  had  federal  net  operating  loss
     carryforwards  of approximately  $132,917,000  for tax reporting  purposes,
     which expire in the years 2001 to 2020. The Company also has investment tax
     credit  carryforwards of approximately  $3,200 and research and development
     tax credit  carryforwards  of  approximately  $7,159,000  for tax reporting
     purposes which expire in the years 2001 to 2020.  The Company's  ability to
     use such net operating  loss,  investment and research and  development tax
     credits  carryforwards are subject to certain  limitations due to ownership
     changes,  as  defined by rules  pursuant  to  Section  382 of the  Internal
     Revenue Code of 1986, and as amended.

          In  addition,  the net  operating  loss  carryfoward  of  $132,917,000
     includes  $47,864,000  from the  acquisition of Enzon,  Labs, Inc. which is
     subject to an annual limitation of $613,000.

(9)  Significant Agreements

     Schering Agreement

          The Company and Schering  Corporation  ("Schering"),  a subsidiary  of
     Schering-Plough,  entered into an agreement in November 1990 (the "Schering
     Agreement")  to apply the  Company's PEG Process to develop a modified form
     of    Schering-Plough's     INTRON(R)A     (interferon    alfa    2b),    a
     genetically-engineered  anticancer and antiviral drug with longer activity.
     During   December  1999,   Schering-Plough   submitted  a  U.S.   marketing
     application  to the  FDA  for the use of  PEG-INTRON  in the  treatment  of
     chronic  hepatitis  C.  In  May  2000,  PEG-INTRON  was  granted  marketing
     authorization  in the European  Union for the  treatment of adult  patients
     with  chronic  hepatitis  C.  Schering-Plough  is  conducting  a Phase  III
     clinical  trial of  PEG-INTRON  as  combination  therapy  with  REBETOL for
     hepatitis C and Phase III clinical  trials of PEG-INTRON  for the treatment
     of chronic  myelogenous  leukemia and  malignant  melanoma.  Earlier  stage
     clinical trials of PEG-INTRON are being conducted for various solid tumors,
     as well as HIV, hepatitis B, and multiple sclerosis.

          Under the license  agreement,  which was amended in 1995 and 1999, the
     Company will receive  royalties on worldwide  sales of PEG-INTRON,  if any.
     Schering is responsible  for  conducting and funding the clinical  studies,
     obtaining  regulatory  approval and marketing  the product  worldwide on an
     exclusive  basis.  During  1999,  the  Company  and  Schering  amended  the
     agreement  that  resulted in an increase in the  effective  royalty rate in
     return for Enzon's exclusive U.S.  manufacturing rights for the product and
     a license  under one of the  Company's  Second  Generation  PEG patents for
     Branched or U-PEG.  The license for Branched PEG gives Schering the ability
     to sublicense the patent for a competing interferon product.




                                      F-17


<PAGE>


                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


          The  Company may be entitled  to  additional  payments  subject to the
     achievement of certain  milestones.  During  February 2000,  $1,000,000 was
     received and recognized as revenue,  related to the filing for FDA approval
     of PEG-INTRON.  Enzon may be entitled to an additional $2,000,000 milestone
     payment  from   Schering.   The  Schering   Agreement   terminates,   on  a
     country-by-country  basis, upon the expiration of the last to expire of any
     future  patents  covering the product  which may be issued to Enzon,  or 15
     years after the product is approved for commercial sale, whichever shall be
     the later to occur.  This agreement is subject to Schering's right of early
     termination  if Enzon fails to obtain or  maintain  the  requisite  product
     liability insurance.

     Aventis Agreement

          Under the Company's Amended Aventis  Pharmaceuticals,  (formerly Phone
     Poulenc Rorer Pharmaceuticals,  Inc.) U.S. License Agreement, Enzon granted
     an  exclusive  license to Aventis to sell  ONCASPAR  in the U.S.  Enzon has
     received  licensing  payments  totaling   $6,000,000  and  is  entitled  to
     royalties  on net sales of ONCASPAR.  During July 2000 the Company  further
     amended the license  agreement  with  Aventis to increase  the base royalty
     payable  to the  Company  on net sales of  ONCASPAR  from 23.5% to 27.5% on
     annual  sales up to $10  million  and 25% on  annual  sales  exceeding  $10
     million.  These royalty payments,  will include Aventis' cost of purchasing
     ONCASPAR under the supply agreement.  The agreement was also extended until
     2016.  Additionally,  the amended  license  agreement  eliminated the super
     royalty of 43.5% on net sales of ONCASPAR which exceed certain  agreed-upon
     amounts.  The Amended  Aventis U.S.  License  Agreement also provides for a
     payment of $3,500,000 in advance  royalties,  which was received in January
     1995.

          The  payment of  royalties  to Enzon under the  Amended  Aventis  U.S.
     License Agreement will be offset by an original credit of $5,970,000, which
     represents the royalty advance plus reimbursement of certain amounts due to
     Aventis  under the original  Aventis U.S.  License  Agreement  and interest
     expense.  The royalty advance is shown as a long term  liability,  with the
     corresponding   current  portion   included  in  accrued  expenses  on  the
     Consolidated  Balance  Sheets  as of June 30,  2000 and 1999.  The  royalty
     advance will be reduced as royalties are  recognized  under the  agreement.
     Through June 30, 2000 an aggregate of  $4,313,000  in royalties  payable by
     Aventis has been offset against the original credit.

          The amended license agreement prohibits Aventis from making,  using or
     selling an asparaginase product in the U.S. or a competing PEG-asparaginase
     product  anywhere  in the world  until the later of the  expiration  of the
     agreement  or, if the  agreement is  terminated  earlier,  five years after
     termination.  The agreement  terminates in December 2016 but  automatically
     renews for  additional  one-year  periods  unless either party notifies the
     other in writing that it intends not to renew the  agreement at least three
     months prior to the end of the current term.  It can be terminated  earlier
     by either  party due to a default by the other.  In  addition,  Aventis may
     terminate  the  agreement at any time upon one year's prior notice to us or
     if we are unable to supply product for more than 60 days under our separate
     supply  agreement  with  Aventis.   When  the  amended  license   agreement
     terminates,  all rights  granted to Aventis under the agreement will revert
     to Enzon.  Under a  separate  supply  agreement,  Aventis  is  required  to
     purchase from Enzon all of its product  requirements  for sales of ONCASPAR
     in North  America.  If the Company is unable to supply  product to Aventis,
     under the supply

                                      F-18


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     agreement  for more than 60 days for any reason other than a force  majeure
     event,  Aventis may terminate the supply  agreement and the Company will be
     required  to  exclusively   license   Aventis  the  know-how   required  to
     manufacture  ONCASPAR  for the period of time  during  which the  agreement
     would have continued had the license agreement not been terminated.

          During August 2000 the Company made a $1.5 million  payment to Aventis
     which  was  accrued  at June 30,  2000 to  settle a  disagreement  over the
     purchase  price of  ONCASPAR  under  the  supply  agreement  and to  settle
     Aventis' claim that Enzon should be  responsible  for Aventis' lost profits
     while   ONCASPAR  is  under  the   temporary   labeling  and   distribution
     modifications.

          Further  beginning in May 2000,  for each month that expires  prior to
     the Company's  receipt of FDA approval to allow marketing and  distribution
     of ONCASPAR  without such  labeling  and  distribution  modifications,  the
     Company  shall pay to Aventis  $100,000.  The Company had not received such
     approval as of September 15, 2000.

          Under  a  separate  license,  Aventis  has  exclusive  rights  to sell
     ONCASPAR  in Canada and  Mexico.  These  agreements  provide for Aventis to
     obtain  marketing  approval  of  ONCASPAR  in Canada and Mexico and for the
     Company to receive  royalties on sales of ONCASPAR in these  countries,  if
     any. These  agreements  expire 10 years after the first  commercial sale of
     ONCASPAR in each country, but automatically renew for consecutive five-year
     periods unless either party elects to terminate at least three months prior
     to the end of the current term.  Aventis may terminate these  agreements on
     one year's prior notice to the Company.

          The Company also has a license  agreement with Aventis for the Pacific
     Rim region, specifically,  Australia, New Zealand, Japan, Hong Kong, Korea,
     China, Taiwan, Philippines,  Indonesia,  Malaysia,  Singapore, Thailand and
     Viet Nam,  (the  "Pacific  Rim").  The  agreement  provides  for Aventis to
     purchase  ONCASPAR  for  the  Pacific  Rim  from  the  Company  at  certain
     established  prices which increase over the ten year term of the agreement.
     Under the  agreement,  Aventis  is  responsible  for  obtaining  additional
     approvals and indications in the licensed  territories.  The agreement also
     provides for minimum purchase  requirements for the first four years of the
     agreement.

     MEDAC Agreement

          The  Company  also  granted  an  exclusive  license  to  MEDAC to sell
     ONCASPAR and any  PEG-asparaginase  product developed by us or MEDAC during
     the term of the  agreement  in  Western  Europe,  Turkey  and  Russia.  The
     Company's  supply  agreement  with  MEDAC  provides  for MEDAC to  purchase
     ONCASPAR from the Company at certain  established  prices,  which  increase
     over  the  initial  five-year  term of the  agreement.  Under  the  license
     agreement,  MEDAC is  responsible  for obtaining  additional  approvals and
     indications  in the licensed  territories,  beyond the  currently  approved
     hypersensitive  indication  in  Germany.  Under  the  agreement,  MEDAC  is
     required to meet certain minimum purchase  requirements.  The MEDAC license
     terminates  in  October  2001,  but  automatically  renews  for  successive
     two-year  periods  unless  either  party  elects to terminate at least nine
     months  prior to the end of the  current  term.  MEDAC  may  terminate  the
     agreement after providing the Company with one year's prior notice.




                                      F-19


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(10) Commitments and Contingencies

          In January 2000, Hoffmann-La Roche filed lawsuits in both the U.S. and
     France against  Schering-Plough  alleging that PEG-Intron infringes certain
     patents held by  Hoffmann-La  Roche.  The validity and scope of Hoffmann-La
     Roche's  patents  in this  segment  of the  industry  could  be  judicially
     determined during these proceedings.

          The  litigation  is at a very early  stage and the Company is not in a
     position to predict its  outcome.  If  Schering-Plough  does not prevail in
     this litigation,  Hoffmann-La  Roche may completely  block  Schering-Plough
     from  commercializing  PEG-INTRON  and the  Company  will not  receive  any
     royalties on the sales of  PEG-INTRON.  This would have a material  adverse
     effect on the  Company's  business,  financial  condition  and  results  of
     operations.

          In the  course of normal  operations,  the  Company  is subject to the
     marketing and manufacturing regulations as established by the Food and Drug
     Administration  ("FDA").  The Company has agreed with the FDA to  temporary
     labeling  and  distribution  modifications  for  ONCASPAR  due to increased
     levels of particulates  in certain  batches of ONCASPAR,  which the Company
     manufactured. The Company, rather than its marketing partner, Aventis, will
     temporarily  distribute  ONCASPAR  directly  to  patients,  on an as needed
     basis.  The  Company  will  conduct  additional   inspection  and  labeling
     procedures prior to distribution.

          The Company  anticipates  a final  resolution  of the  problem  during
     fiscal  2001.  It is expected  that  Aventis  will resume  distribution  of
     ONCASPAR at that time. There can be no assurance that this solution will be
     acceptable  to the FDA or  Aventis.  If the  Company  cannot  resolve  this
     problem it is possible  that the FDA may not permit the Company to continue
     to  distribute  this product.  An extended  disruption in the marketing and
     distribution  of ONCASPAR  could have a material  adverse  impact on future
     ONCASPAR sales.

          The Company maintains a separate supply agreement with Aventis,  under
     which  The  Company  is  responsible  for  the  supply  of all of  Aventis'
     requirements for ONCASPAR.

          During August 2000, the Company made a $1.5 million payment to Aventis
     which was accrued for at June 30 to settle a disagreement over the purchase
     price of ONCASPAR under the supply  agreement and to settle  Aventis' claim
     that the Company  should be  responsible  for Aventis'  lost profits  while
     ONCASPAR is under the  temporary  labeling and  distribution  modifications
     described  above.  Further  beginning  in May 2000 and for each  month that
     expires prior to the Company's  receipt of FDA approval to allow  marketing
     and  distribution  of ONCASPAR  without  such  labeling  and  distributions
     modifications,  the Company shall pay to Aventis $100,000.  The Company had
     not received such approval as of September 15, 2000.

          During April 2000, the Company agreed to binding arbitration to settle
     a lawsuit, filed by LBC Capital Resources,  Inc. ("LBC") a former financial
     advisor,  in the  United  States  District  Court for the  District  of New
     jersey. The arbitrator awarded LBC a $6,000,000  judgment.  In its suit LBC
     claimed  that  under a May 2, 1995  letter  agreement  between  LBC and the
     Company,  LBC was entitled to a commission in connection with the Company's
     January  and March 1996  private  placements,  comprised  of  $675,000  and
     warrants to purchase 1,250,000 shares of the Company's common


                                      F-20


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


     stock  at an  exercise  price  of  $2.50  per  share.  As a  result  of the
     arbitration award, the Company recognized a net charge to selling,  general
     and  administrative  expenses of approximately  $2,600,000 during the third
     quarter of the year  ended June 30,  2000.  The charge  represents  the net
     profit and loss effect of the incremental  reserves  provided  specifically
     for  this  litigation,  offset  by the  reduction  during  the  quarter  of
     $2,900,000  of  other  contingency  accruals  that  were  deemed  to not be
     required for certain other contingencies.

          The  Company  has  agreements   with  certain  members  of  its  upper
     management which provide for payments following a termination of employment
     occurring after a change in control of the Company. The Company also has an
     employment  agreement,  dated  August 10,  2000,  with its Chief  Executive
     Officer which provides for severance  payments in addition to the change in
     control provisions discussed above.

(11) Leases

          The Company has several leases for office,  warehouse,  production and
     research facilities and equipment.

          Future minimum lease  payments,  net of subleases,  for  noncancelable
     operating  leases with  initial or  remaining  lease terms in excess of one
     year as of June 30, 2000 are:

                  Year ending                                Operating
                  June 30,                                     leases
                  --------                                     ------
                    2001                                      1,003,000
                    2002                                        834,000
                    2003                                        779,000
                    2004                                        765,000
                    2005                                        765,000
                  Later years, through 2007                   1,987,000
                                                            -----------
                  Total minimum lease payments               $6,133,000
                                                            ===========

          Rent expense amounted to $1,055,000, $1,394,000 and $1,768,000 for the
     years ended June 30, 2000, 1999 and 1998, respectively.

          For the years  ended June 30,  1999 and 1998,  rent  expense is net of
     subrental income of $110,000 and 221,000 respectively. As of June 30, 1999,
     the Company no longer subleases a portion of its facilities.

(12) Retirement Plans

          The Company maintains a defined contribution,  401(k) pension plan for
     substantially  all its employees.  The Company currently matches 50% of the
     employee's  contribution  of  up to 6% of  compensation,  as  defined.  The
     Company's  match is invested solely in a fund which purchases the Company's
     Common Stock in the open market. Total company  contributions for the years
     ended June 30, 2000,  1999 and 1998 were  $128,000,  $115,000 and $100,000,
     respectively.



                                      F-21
<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes to Consolidated Financial Statements, Continued


(13)     Accrued Expenses

                  Accrued expenses consist of:
                                                               June 30,
                                                     --------------------------

                                                        2000             1999
                                                     ----------      ----------
                  Accrued wages and vacation         $1,238,000      $1,074,000
                  Accrued Medicaid rebates              962,000       1,114,000
                  Current portion of royalty
                    advance - Aventis                   854,000         200,000
                  Contract and legal accrual          1,500,000       3,328,000
                  Other                               1,153,000         546,000
                                                     ----------      ----------
                                                     $5,707,000      $6,262,000
                                                     ==========      ==========


(14) Business and Geographical Segments

          The  Company is  managed  and  operated  as one  business.  The entire
     business  is  comprehensively  managed  by a single  management  team  that
     reports  to the Chief  Executive  Officer.  The  Company  does not  operate
     separate  lines of business or separate  business  entities with respect to
     any of its products or product  candidates.  In addition,  the Company does
     not  conduct  any  of  its   operations   outside  of  the  United  States.
     Accordingly,  the Company does not prepare discrete  financial  information
     with  respect to separate  product  areas or by location  and does not have
     separately reportable segments as defined by SFAS No. 131.

          During the years ended June 30, 2000,  1999 and 1998,  the Company had
     export sales of $4,104,000,  $3,075,000 and  $2,641,000,  respectively.  Of
     these  amounts,  sales to Europe  represented  $3,584,000,  $2,559,000  and
     $2,117,000   during  the  years  ended  June  30,  2000,   1999  and  1998,
     respectively. Included as a component of European sales are sales to France
     which were  $1,201,000,  $1,108,000  and  $994,000 and sales to Italy which
     were  $1,285,000,  $1,201,000,  $879,000 for the years ended June 30, 2000,
     1999 and 1998.

          ADAGEN sales represent approximately 78%, 90% and 82% of the Company's
     total  net  sales  for the  year  ended  June  30,  2000,  1999  and  1998,
     respectively.  ADAGEN's Orphan Drug  designation  under the Orphan Drug Act
     expired in March 1997.  The Company  believes  the  expiration  of ADAGEN's
     Orphan  Drug  designation  will not have a material  impact on the sales of
     ADAGEN.  Approximately  46%, 49% and 48% of the Company's  ADAGEN sales for
     the years ended June 30, 2000,  1999 and 1998,  respectively,  were made to
     Medicaid patients.




                                      F-22





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