ENZON INC
10-Q/A, 2000-02-25
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                          ----------------------------
                                   FORM 10-Q/A
                QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934
                           ---------------------------


For the Quarter Ended December 31, 1999              Commission File No. 0-12957


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


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


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

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



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 ___


The number of shares of common stock, $.01 par value, outstanding as of February
8, 2000 was 37,956,086 shares.



<PAGE>

PART I FINANCIAL INFORMATION
Item 1. Financial Statements


                          ENZON, INC. AND SUBSIDIARIES
                      CONSOLIDATED CONDENSED BALANCE SHEETS
                       December 31, 1999 and June 30, 1999

                                                     December 31,     June 30,
                                                          1999          1999
                                                      (unaudited)        *
                                                      -----------   -----------

ASSETS
Current assets:
  Cash and cash equivalents                           $23,261,685   $24,673,636
  Accounts receivable                                   4,701,186     4,604,847
  Inventories                                           1,423,507     1,326,601
  Other current assets                                  1,738,367     1,034,327
                                                      -----------   -----------
     Total current assets                              31,124,745    31,639,411
                                                      -----------   -----------

Property and equipment                                 11,951,345    12,054,505
  Less accumulated depreciation and amortization       10,497,269    10,649,661
                                                      -----------   -----------
                                                        1,454,076     1,404,844
                                                      -----------   -----------
Other assets:
  Investments                                              68,823        68,823
  Other assets, net                                       807,711       753,683
  Patents, net                                            977,883     1,049,554
                                                      -----------   -----------
                                                        1,854,417     1,872,060
                                                      -----------   -----------
Total assets                                          $34,433,238   $34,916,315
                                                      ===========   ===========


LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Accounts payable                                     $1,783,726    $1,716,089
  Accrued expenses                                      8,232,526     6,261,640
                                                      -----------   -----------
     Total current liabilities                         10,016,252     7,977,729
                                                      -----------   -----------
Accrued rent                                              621,152       634,390
Royalty advance - RPR                                     815,583       728,977
                                                      -----------   -----------
                                                        1,436,735     1,363,367
                                                      -----------   -----------

Commitments and contingencies

Stockholders' equity:

  Preferred stock-$.01 par value, authorized
    3,000,000 shares: issued and outstanding 27,000
    shares at December 31, 1999 and 107,000
    at June 30, 1999 (liquidation preference
    aggregating $1,189,000 at December 31,
    1999 and $4,659,000 at June 30, 1999)                     270         1,070

  Common stock-$.01 par value, authorized
    60,000,000 shares; issued and outstanding
    37,209,146 shares at December 31, 1999 and
    36,488,684 shares at June 30, 1999                    372,091       364,886
  Additional paid-in capital                          149,371,514   146,970,289
  Accumulated deficit                                (126,763,624) (121,761,026)
                                                      -----------   -----------
Total stockholders' equity                             22,980,251    25,575,219
                                                      -----------   -----------

Total liabilities and stockholders' equity            $34,433,238   $34,916,315
                                                      ===========   ===========

*Condensed from audited financial statements.

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

                                        2

<PAGE>

                                   ENZON, INC.
                 CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS
          Three Months and Six Months Ended December 31, 1999 and 1998
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                   Three months ended                      Six months ended
                                                              December 31,       December 31,       December 31,       December 31,
                                                                  1999               1998               1999               1998
                                                              ------------       ------------       ------------       ------------
<S>                                                           <C>                <C>                <C>                <C>
Revenues
  Sales                                                       $  3,746,768       $  3,782,411       $  6,616,903       $  6,718,113
  Contract revenue                                                  18,304             15,510             61,982             67,475
                                                              ------------       ------------       ------------       ------------
     Total revenues                                              3,765,072          3,797,921          6,678,885          6,785,588
                                                              ------------       ------------       ------------       ------------
Costs and expenses
  Cost of sales                                                    792,921          1,028,945          1,971,482          2,338,796
  Research and development expenses                              1,932,969          1,847,565          3,590,252          3,422,911
  Selling, general and administrative expenses                   2,810,438          2,108,376          5,136,409          3,643,655
                                                              ------------       ------------       ------------       ------------
     Total costs and expenses                                    5,536,328          4,984,886         10,698,143          9,405,362
                                                              ------------       ------------       ------------       ------------
       Operating loss                                           (1,771,256)        (1,186,965)        (4,019,258)        (2,619,774)
                                                              ------------       ------------       ------------       ------------
Other income (expense)
  Interest and dividend income                                     298,725            300,315            599,222            602,881
  Interest expense                                                    (926)            (2,619)            (3,884)            (8,055)

  Other                                                            (36,274)            39,104            (36,274)            39,834
                                                              ------------       ------------       ------------       ------------
                                                                   261,525            336,800            559,064            634,660
                                                              ------------       ------------       ------------       ------------
     Net loss                                                 ($ 1,509,731)      ($   850,165)      ($ 3,460,194)      ($ 1,985,114)
                                                              ============       ============       ============       ============
Basic and diluted loss per common share                       ($      0.04)      ($      0.03)      ($      0.09)      ($      0.06)
                                                              ============       ============       ============       ============

Weighted average number of common shares
  issued and outstanding                                        37,020,464         35,611,863         36,835,399         35,181,937
                                                              ============       ============       ============       ============
</TABLE>


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

                                       3

<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                   Six Months Ended December 31, 1999 and 1998
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                             Six Months Ended
                                                                      December 31,      December 31,
                                                                          1999              1998
                                                                      ------------      ------------
<S>                                                                   <C>               <C>
Cash flows from operating activities:
  Net loss                                                            ($ 3,460,194)     ($ 1,985,114)
  Adjustment for depreciation and amortization                             243,212           559,869
  Loss (gain) on retirement of equipment                                    36,274           (39,834)
  Non-cash expense for issuance of common stock and stock options          207,770           242,497
  Decrease in accrued rent                                                 (13,238)          (79,533)
  Increase (decrease) in royalty advance - RPR                               5,219          (110,507)
  Changes in assets and liabilities                                      1,168,597        (1,906,039)
                                                                      ------------      ------------
  Net cash used in operating activities                                 (1,812,360)       (3,318,661)
                                                                      ------------      ------------
Cash flows from investing activities:
  Capital expenditures                                                    (257,047)         (137,875)
  Proceeds from sale of equipment                                               --           129,872
                                                                      ------------      ------------
  Net cash used in investing activities                                   (257,047)           (8,003)
                                                                      ------------      ------------

Cash flows from financing activities:
  Proceeds from issuance of common stock, net                            2,199,860        20,583,850
  Dividends paid on Series A Preferred Stock                            (1,542,404)               --
                                                                      ------------      ------------
  Net cash provided by financing activities                                657,456        20,583,850
                                                                      ------------      ------------

  Net (decrease) increase in cash and cash equivalents                  (1,411,951)       17,257,186
  Cash and cash equivalents at beginning of period                      24,673,636         6,478,459
                                                                      ------------      ------------
  Cash and cash equivalents at end of period                          $ 23,261,685      $ 23,735,645
                                                                      ============      ============
</TABLE>



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

                                       4

<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes To Consolidated Condensed Financial Statements
                                   (Unaudited)


(1)  Organization and Basis of Presentation

The unaudited  consolidated  condensed  financial  statements have been prepared
from the books and records of Enzon,  Inc. and  subsidiaries  in accordance with
generally  accepted  accounting  principles for interim  financial  information.
Accordingly,  they do not include all of the information and footnotes  required
by generally accepted accounting  principles for complete financial  statements.
In the opinion of management,  all  adjustments  (consisting  only of normal and
recurring  adjustments)  considered  necessary for a fair presentation have been
included. Interim results are not necessarily indicative of the results that may
be expected for the year.

(2)  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 preferred stock dividends of
$14,000 and $54,000 for the three months ended  December 31, 1999 and 1998,  and
$27,000  and  $107,000  for the six months  ended  December  31,  1999 and 1998,
respectively,  divided  by the  weighted  average  number of shares  issued  and
outstanding  during the periods.  Due to the net loss recorded for the three and
six months ended  December 31, 1999 and 1998,  the exercise or conversion of all
dilutive  potential  common  shares is not  included for purposes of the diluted
loss per share  calculation.  As of December 31, 1999, the Company had 6,842,000
common  stock  equivalents  outstanding  that could  potentially  dilute  future
diluted earnings per share calculations.

(3)  Inventories

The  composition  of  inventories  at December  31, 1999 and June 30, 1999 is as
follows:

                                   December 31,         June 30,
                                       1999              1999
                                   ------------       ----------
            Raw materials             $240,000          $503,000
            Work in process          1,017,000           548,000
            Finished goods             167,000           276,000
                                    ----------        ----------
                                    $1,424,000        $1,327,000
                                    ==========        ==========

(4)  Cash Flow Information

       Highly liquid securities with original maturities of three months or less
are  considered  to  be  cash  equivalents.  Cash  payments  for  interest  were
approximately  $4,000 for the six months ended  December 31, 1999 and $8,000 for
the six months ended  December 31, 1998.  There were no income tax payments made
for the six months ended December 31, 1999 and 1998. During the six months ended
December 31, 1999,  80,000 shares of Series A Cumulative  Convertible  Preferred
Stock  ("Series A Preferred  Stock") were  converted to 181,818 shares of Common
Stock.  Accrued  dividends on the converted  preferred shares of $1,542,000 were
settled by a cash payment. There were no conversions of Series A Preferred Stock
during the six months ended December 31, 1998.

                                       5

<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes To Consolidated Condensed Financial Statements
                                   (Unaudited)


(5)  Non-Qualified Stock Option Plan

     On December 7, 1999 the stockholders voted to increase the number of shares
reserved for issuance under our  Non-Qualified  Stock Option Plan from 6,200,000
to 7,900,000.  During the six months ended  December 31, 1999, we issued 209,000
stock  options  at an  average  exercise  price of $29.07  per  share  under our
Non-Qualified  Stock  Option Plan,  as amended,  of which 77,000 were granted to
executive  officers  as part of a bonus plan for the year  ended June 30,  1999.
None of the options granted during the period are exercisable as of December 31,
1999. All options were granted with exercise prices that equaled or exceeded the
fair market value of the underlying stock on the date of grant.

(6)  Business Segments

     A single  management  team  that  reports  to the Chief  Executive  Officer
comprehensively  manages our  business  operations.  We do not operate  separate
lines of business  or  separate  business  entities  with  respect to any of our
approved  products or product  candidates.  In  addition,  we do not conduct any
operations  outside of the United States.  We do not prepare discrete  financial
statements with respect to separate product areas.  Accordingly,  we do not have
separately  reportable segments as defined by Statement of Financial  Accounting
Standards No. 131,  "Disclosures  about  Segments of an  Enterprise  and Related
Information".

(7)  Comprehensive Loss

     The net loss of  $1,510,000  and  $850,000,  recorded  for the three months
ended December 31, 1999 and 1998 and $3,460,000 and $1,985,000, recorded for the
six months  ended  December  31,  1999 and 1998,  respectively,  is equal to the
comprehensive loss for those periods.

(8)  Commitments and Contingencies

     We are being sued, in the United States  District Court for the District of
New Jersey,  by a former  financial  advisor  asserting that under a May 2, 1995
letter agreement  between us and LBC Capital Resources Inc., LBC was entitled to
a commission in connection  with our January and March 1996 private  placements,
comprised of $500,000 and  warrants to purchase  1,000,000  shares of our common
stock at an exercise  price of $2.50 per share.  LBC has claimed  $3,000,000  in
compensatory  damages,  plus  punitive  damages,  counsel fees and costs for the
alleged breach of the letter  agreement.  We have entered into an agreement with
LBC (Stipulation of Damages) that if we are found liable to LBC in this suit the
damages for these claims would be limited to  $2,750,000  in cash.  LBC has also
asserted  that it is entitled to an  additional  fee of $175,000 and warrants to
purchase 250,000 shares of our common stock to the extent the warrants issued to
investors  in  the  private  placements  are  exercised.   We  believe  that  no
compensation  is due to LBC under the letter  agreement  and deny any  liability
under the letter  agreement.  We intend to defend this  lawsuit  vigorously  and
believe the ultimate  resolution of this matter will not have a material adverse
effect on our financial position. However, if we were required to issue warrants
to LBC we would be required to incur a non-cash  expense for each warrant issued
equal to the difference  between the exercise price of the warrants  ($2.50) and
the then current market price of our common stock.

     In January  2000,  Hoffman-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.  This litigation is at a very early stage and we are 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 we will not receive any royalties on the sales of
PEG-Intron. This would have a material adverse effect on our business, financial
condition and results of operations.

     In the course of normal  operations,  we are subject to the  marketing  and
manufacturing  regulations as  established  by the Food and Drug  Administration
("FDA").  We have agreed with the FDA to  temporary  labeling  and  distribution
modifications  for ONCASPAR due to increased  levels of  particulates in certain
batches of  ONCASPAR,  which we  manufactured.  We,  rather  than our  marketing
partner,  Rhone-Poulenc  Rorer ("RPR"),  will  temporarily  distribute  ONCASPAR
directly  to  patients,  on an as  needed  basis.  We  will  conduct  additional
inspection and labeling procedures prior to distribution.

                                       6


<PAGE>

                          ENZON, INC. AND SUBSIDIARIES
              Notes To Consolidated Condensed Financial Statements
                                   (Unaudited)


     We have manufactured  several batches of ONCASPAR which contain  acceptable
levels of particulates  and anticipate a final  resolution of the problem during
fiscal 2000.  It is expected  that RPR will resume  distribution  of ONCASPAR at
that time.  There can be no assurance  that this  solution will be acceptable to
the FDA. If we cannot  resolve this problem it is possible  that the FDA may not
permit us 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.

     We maintain a separate supply agreement with RPR, under which RPR purchases
from us all of RPR's  requirements for ONCASPAR at a price defined in the supply
agreement.  We are currently in  discussions  with RPR related to a disagreement
over the purchase price of ONCASPAR under the supply agreement we have with RPR.
RPR has asserted that we have overcharged them under the supply agreement in the
amount of  $2,329,000.  We believe  our  costing  and pricing of ONCASPAR to RPR
complies with the supply agreement.

     RPR has also  asserted that we should be  responsible  for its lost profits
while ONCASPAR is under the temporary  labeling and distribution  modifications.
RPR contends that its lost profits through December 31, 1999 were $5,194,000. We
do not agree with RPR's claim for  overcharges  under the supply  agreement  and
lost  profits.  We do not believe the ultimate  resolution of these matters will
have a material adverse effect on our financial results or operations, though it
could have a material adverse effect on our financial position.

(9)  Schering Agreement

     During   December   1999,   our   development   partner   for   PEG-Intron,
Schering-Plough submitted a U.S. marketing application to the FDA for the use of
PEG-Intron  in the  treatment  of chronic  hepatitis  C. We are entitled to a $1
million milestone payment upon the FDA's acceptance of this filing.


     Schering-Plough  has also  reported  that it has  submitted  a  centralized
Marketing  Authorization  Application for the use of PEG-Intron in the treatment
of chronic  hepatitis C to the  European  Union's (EU)  European  Agency for the
Evaluation of Medicinal Products (EMEA).

     Under  the  Company's  licensing  agreement  with  Schering-Plough,  we are
entitled to  royalties  on  worldwide  sales of  PEG-Intron.  We will receive an
additional $2 million milestone payment upon FDA approval of PEG-Intron.

(10) Subsequent Events

     During  January  2000,  all of the  outstanding  Series B  Preferred  Stock
warrants  to  purchase  657,895  shares of Common  Stock  were  exercised.  This
exercise resulted in net proceeds of approximately $2,625,000.

                                       7

<PAGE>

Item 2. Management's  Discussion and Analysis of Financial Condition and Results
        of Operations

Information contained herein contains "forward-looking  statements" which can be
identified  by the  use  of  forward-looking  terminology  such  as  "believes,"
"expects,"  "may," "will," "should," or "anticipates" or the negative thereof or
other  variations  thereon  or  comparable  terminology,  or by  discussions  of
strategy.  No  assurance  can be given  that the future  results  covered by the
forward-looking  statements  will be  achieved.  The  matters  set  forth in the
Company's  Annual  Report on Form 10-K for the fiscal year ended June 30,  1999,
which is  incorporated  herein by reference,  constitute  cautionary  statements
identifying  important factors with respect to such forward-looking  statements,
including  certain risks and  uncertainties,  that could cause actual results to
vary  materially  from the  future  results  indicated  in such  forward-looking
statements.  Other  factors could also cause actual  results to vary  materially
from the future results indicated in such forward-looking statements.

Results of Operations

Three months ended December 31, 1999 vs. Three months ended December 31, 1998

Revenues. Revenues for the three months ended December 31, 1999 were $3,765,000,
as compared to  $3,798,000  for the three  months ended  December 31, 1998.  The
components  of revenues  are sales,  which  consist of our sales of products and
royalties on the sale of these products by others, and contract revenues.  Sales
decreased by 1% to $3,747,000  for the three months ended  December 31, 1999, as
compared to $3,782,000 for the prior year. The decrease was due to a decrease in
ONCASPAR  revenues.  The decrease in ONCASPAR  revenues was offset in part by an
increase in ADAGEN  sales of  approximately  12%, due to an increase in patients
receiving  ADAGEN  treatment.  Net sales of ADAGEN were $3,296,000 for the three
months  ended  December  31,  1999 and  $2,936,000  for the three  months  ended
December 31, 1998. We market ADAGEN  internally and ONCASPAR  through  marketing
agreements in the U.S. and Canada with Rhone-Poulenc Rorer  Pharmaceuticals Inc.
("RPR") and in Europe with MEDAC GmbH ("MEDAC"). ONCASPAR revenues are comprised
of  manufacturing  revenues,  as well as  royalties on sales of ONCASPAR by RPR.
ONCASPAR revenues for the quarter decreased due to declines in manufacturing and
royalty   revenues   which  resulted  from   difficulties   encountered  in  our
manufacturing  process and the changes  made to our  labeling  and  distribution
procedures, as described below.

During 1998, we began to experience  manufacturing  problems with ONCASPAR.  The
problems  were due to an  increase in the levels of  particulates  in batches of
ONCASPAR  which resulted in an increased  rejection rate for this product.  As a
result of these  manufacturing  problems,  we agreed  with the FDA to  temporary
labeling and distribution  modifications for ONCASPAR. We took over distribution
of ONCASPAR directly to patients on an as-needed basis and instituted additional
inspection and labeling  procedures prior to distribution.  In addition,  during
May 1999, the FDA required us to limit distribution of the product to only those
patients who are hypersensitive to native  L-asparaginese.  In November 1999 the
FDA lifted this restriction.

We have been able to  manufacture  several  batches of  ONCASPAR  which  contain
acceptable  levels of  particulates  and  anticipate a final  resolution  of the
problem  during the fourth  quarter of fiscal 2000. It is expected that RPR will
resume  distribution  of ONCASPAR at that time.  There can be no assurance  that
this  solution  will be  acceptable to the FDA. If we are unable to resolve this
problem,  the FDA may not permit us to continue to distribute  this product.  An
extended  disruption in the marketing  and  distribution  of ONCASPAR may have a
material adverse impact on future ONCASPAR sales.

We expect  sales of ADAGEN to increase  at rates  comparable  to those  achieved
during the last two years as additional patients are treated. We also anticipate
ONCASPAR sales will remain at reduced levels until we resolve the  manufacturing
problem and RPR resumes  normal  distribution  of the product.  We cannot assure
that any  particular  sales  levels of ADAGEN or  ONCASPAR  will be  achieved or
maintained.

We had export sales of $1,089,000  for the three months ended  December 31, 1999
and $945,000 for the three months  ended  December 31, 1998.  Of these  amounts,
sales in Europe were  $975,000 for the three months ended  December 31, 1999 and
$863,000 for the three months ended December 31, 1998.

Cost of Sales. Cost of sales, as a percentage of sales,  improved to 21% for the
three months ended  December 31, 1999 as compared to 27% for the prior year. The
improvement was primarily due to a charge taken in the three months

                                       8

<PAGE>

ended  December 31, 1998 related to the write-off of ONCASPAR  finished goods on
hand and in the  distribution  pipeline.  The  increased  write-off  of ONCASPAR
finished  goods  was  attributable  to  the  manufacturing  problems  previously
discussed.

Research and Development.  Research and development  expenses increased by 5% to
$1,933,000 for the three months ended December 31, 1999 from  $1,848,000 for the
same period last year.  The increase  was due to  increased  payroll and related
expenses as well as the  acquisition of certain patent rights.  Our research and
development expenses are focused on the clinical development of PEG-camptothecin
which is in Phase I clinical trials, as well as preclinical development of other
PEG compounds.

Selling,  General  and  Administrative.   Selling,  general  and  administrative
expenses  for the three  months  ended  December  31, 1999  increased  by 33% to
$2,810,000,  as compared to $2,108,000  in 1998.  The increase was primarily due
to,  increased  legal  fees  related  to  litigation  and  ongoing   arbitration
proceedings, as well as increased patent filing and defense costs. Our marketing
and distribution  costs for ONCASPAR were also higher in comparison to the prior
year, due to the changes in distribution previously discussed. Currently, we are
responsible for the marketing and distribution of this product until RPR resumes
distribution  of the  product.  During the prior year,  a portion of these costs
were RPR's responsibility.

Six months ended December 31, 1999 vs. Six months ended December 31, 1998

Revenues.  Revenues  for the six months  ended  December  31, 1999  decreased by
$107,000 to $6,679,000 as compared to $6,786,000  for the same period last year.
The components of revenues are sales, which consist of sales of our products and
royalties on the sale of these products by others, and contract revenues.  Sales
decreased by 2% to  $6,617,000  for the six months ended  December 31, 1999,  as
compared to $6,718,000  for the prior year. The decrease was due to a decline in
ONCASPAR  revenues.  The  decrease in ONCASPAR  revenue was offset in part by an
increase in ADAGEN sales of  approximately  11%,  resulting  from an increase in
patients receiving ADAGEN treatment.  Net sales of ADAGEN, which we market, were
$6,042,000 for the six months ended December 31, 1999 and $5,428,000 for the six
months ended  December 31,  1998.  The decrease in ONCASPAR  revenues was due to
declines in  manufacturing  and royalty  revenues  resulting  from  difficulties
encountered in our  manufacturing  process and the resulting changes in labeling
and distribution previously described. We had export sales of $2,007,000 for the
six months  ended  December  31, 1999 and  $1,723,000  for the six months  ended
December 31, 1998. Of these amounts, sales in Europe were $1,748,000 for the six
months ended  December 31, 1999 and $1,487,000 for the six months ended December
31, 1998.

Cost of Sales. Cost of sales, as a percentage of sales,  improved to 30% for the
six months  ended  December 31, 1999 as compared to 35% for the six months ended
December 31, 1998. The  improvement  was primarily due to a charge taken in 1998
related  to  the  write-off  of  ONCASPAR  finished  goods  on  hand  and in the
distribution pipeline. The prior year's write-off of ONCASPAR finished goods was
attributable to the manufacturing problems previously discussed.

Research and Development.  Research and Development  expenses increased by 5% to
$3,590,000  for the six months ended  December 31, 1999 from  $3,423,000  in the
same period last year.  The increase  was due to  increased  payroll and related
expenses as well as the acquisition of certain patent rights.

Selling,  General  and  Administrative.   Selling,  general  and  administrative
expenses  for the  six  months  ended  December  31,  1999  increased  by 41% to
$5,136,000,  as  compared to  $3,644,000  in the prior year.  The  increase  was
primarily  due to  increased  legal  fees  related  to  litigation  and  ongoing
arbitration  proceedings,   increased  patent  filing  and  defense  costs,  and
increased ONCASPAR marketing and distribution costs.

Liquidity and Capital Resources

Total cash reserves, including cash and cash equivalents as of December 31, 1999
were  $23,262,000,  as compared to $24,674,000 as of June 30, 1999. The decrease
in total cash  reserves was due to the payment of  approximately  $1,542,000  in
cumulative accrued dividends on 80,000 shares of Series A Preferred Stock during
the quarter ended

                                       9

<PAGE>

December 31, 1999. The 80,000 shares of Series A Preferred  Stock were converted
into 181,818  shares of common  stock  during the six months ended  December 31,
1999.  We  invest  our  excess  cash in a  portfolio  of  high-grade  marketable
securities and United States government-backed securities.

To date,  our sources of cash have been the proceeds  from the sale of our stock
through  public  offerings  and private  placements,  sales of ADAGEN,  sales of
ONCASPAR,  sales of our products for research  purposes,  contract  research and
development fees, technology transfer and license fees and royalty advances. Our
current sources of liquidity are cash,  cash  equivalents and interest earned on
such cash reserves,  sales of ADAGEN,  sales of ONCASPAR,  sales of our products
for research purposes and license fees.

Under  our  amended  license  agreement  with RPR,  we  received  a  payment  of
$3,500,000 in advance royalties in January 1995. Royalties due under the amended
license agreement will be offset against an original credit of $5,970,000, which
represents the royalty  advance plus  reimbursement  of certain  amounts due RPR
under the original agreement and interest expense,  before cash payments will be
made under the agreement. The royalty advance is shown as a long-term liability.
The corresponding current portion of the advance is included in accrued expenses
on the consolidated  balance sheets. We will reduce the advance as royalties are
recognized  under the  agreement.  Through  December 31,  1999,  an aggregate of
$4,369,000  in  royalties  payable by RPR has been offset  against the  original
credit.

As of  December  31,  1999,  we had 27,000  shares of Series A  Preferred  Stock
outstanding.  These preferred shares are convertible into  approximately  61,364
shares of common stock.  Dividends accrue on the remaining outstanding shares of
Series A Preferred Stock at a rate of $54,000 per year. As of December 31, 1999,
there were  accrued  and unpaid  dividends  totaling  $514,000  on the shares of
Series A Preferred Stock outstanding.  We have the option to pay these dividends
in either cash or common stock.

We are  currently in  discussions  with RPR related to a  disagreement  over the
purchase price we charged RPR for ONCASPAR under our supply  agreement with RPR.
RPR has asserted that we have overcharged them under the supply agreement in the
amount of  $2,329,000.  We believe our costing and pricing of ONCASPAR  complies
with the supply  agreement.  RPR has also asserted that we should be responsible
for its  lost  profits  while  ONCASPAR  is under  the  temporary  labeling  and
distribution modifications.  RPR contends that its lost profits through December
31, 1999 were $5,194,000.  We do not agree with RPR's claims.  We do not believe
the ultimate  resolution of either matter will have a materially  adverse effect
on our financial results or operations,  though it could have a material adverse
effect on our financial position.

We are being sued, in the United States  District  Court for the District of New
Jersey,  by LBC Captial  Resources  Inc.,  a former  financial  advisor.  LBC is
asserting  that under the May 2, 1995 letter  agreement  between us and LBC, LBC
was  entitled  to a  commission  in  connection  with our January and March 1996
private  placements,  comprised of $500,000  and warrants to purchase  1,000,000
shares of our common  stock at an  exercise  price of $2.50 per  share.  LBC has
claimed $3,000,000 in compensatory damages, plus punitive damages,  counsel fees
and costs for the alleged breach of the letter  agreement.  We have entered into
an agreement with LBC (known as the  Stipulation of Damages) which provides that
if we are found  liable to LBC in this suit,  the damages for these claims would
be limited to $2,750,000  in cash.  LBC has also asserted that it is entitled to
an  additional  fee of $175,000 and warrants to purchase  250,000  shares of our
common  stock to the extent the  warrants  issued to  investors  in the  private
placements are exercised.  We believe that no  compensation  is due to LBC under
the letter  agreement  and deny any  liability  under the letter  agreement.  We
intend to defend this lawsuit vigorously and believe the ultimate  resolution of
this matter will not have a material  adverse effect on our financial  position.
However,  if we were  required to issue  warrants to LBC we would be required to
incur a non-cash  expense for the cash warrants  issued equal to the  difference
between the exercise  price of the warrants  ($2.50) and the then current market
price of our common stock.

We believe that our existing  cash  resources  should be  sufficient to fund our
capital and  operational  requirements  (at current  levels) for the foreseeable
future. Upon exhaustion of our current cash reserves,  our continued  operations
will depend on our ability to realize  significant  revenues from the commercial
sale of our products,  raise  additional funds through equity or debt financing,
or obtain significant  licensing,  technology  transfer or contract research and
development  fees. We cannot make any assurance that these sales,  financings or
revenue generating activities will be successful.

                                       10

<PAGE>

Year 2000

In 1999 we  completed  a review  of our  business  systems,  including  computer
systems and manufacturing equipment, and queried our customers and vendors as to
their  progress in identifying  and  addressing  problems that their systems may
face in correctly  interrelating  and  processing  date  information in the year
2000. To date, we have not experienced any significant  problems  related to the
year 2000  problem,  either in our  systems  or the  systems  of our  vendors or
customers.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

     Not applicable.






                                       11

<PAGE>

PART II OTHER INFORMATION


Item 4. Submission of Matters to a Vote of Security Holders

     (a)  An annual meeting of stockholders was held on December 7, 1999.

     (b)  The directors  elected at the annual meeting were Peter G. Tombros and
Dr.  Rosina B. Dixon.  The term of office as a director for each of Dr. David W.
Golde,  Robert LeBuhn, A.M. "Don" MacKinnon,  Rolf A. Classon,  David S. Barlow,
and Randy H. Thurman continued after the annual meeting.

     (c) The  matters  voted upon at the annual  meeting  and the results of the
voting, including broker non-votes where applicable, are set forth below.

     (i) The stockholders  voted  26,656,921  shares in favor and 290,486 shares
withheld  with respect to the election of Peter G. Tombros as a Class I director
of the Company and 26,654,298  shares in favor and 292,479 shares  withheld with
respect  to the  election  of Dr.  Rosina  Dixon  as a Class I  director  of the
Company. Broker non-votes were not applicable.

     (ii) The  stockholders  voted  25,215,931  shares in favor,  959,525 shares
against  611,230  abstained  and 160,721 not voted with respect to a proposal to
approve amendments to the Company's Non-Qualified Stock Option Plan, as amended.
Broker non-votes were not applicable.

     (iii) The stockholders voted 26,648,657 shares in favor and 281,417 against
with  respect to a proposal  to ratify  the  selection  of KPMG LLP to audit the
Company's  consolidated financial statements for the fiscal year ending June 30,
2000. Broker non-votes were not applicable.

Item 5. Other Information

     In January  2000,  Hoffman-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.  This litigation is at a very early stage and we are 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 we will not receive any royalties on the sales of
PEG-Intron. This would have a material adverse effect on our business, financial
condition and results of operations.

     We  announced  on  February  10,  2000 that  Schering-Plough  Corporations'
Biologics  License  Application (BLA) for  PEG-Intron(TM)  has been accepted for
standard review by the FDA.  PEG-Intron is a modified form of  Schering-Plough's
INTRON(R) A (interferon  alfa-2b) that uses proprietary PEG technology developed
by Enzon.  Schering-Plough  submitted  its BLA to the FDA on  December  23, 1999
seeking  marketing  clearance  for  PEG-Intron  (peginterferon  alfa-2b) for the
treatment  of  chronic  hepatitis  C in  patients  18 years of age or older with
compensated liver disease.

     Under  the  Prescription  Drug  Users  Fee  Act,  the  FDA  should  act  on
Schering-Plough's  BLA  within  12  months  from  the  date  of  receipt.  While
Schering-Plough  had requested  priority review status for the drug, which would
have taken six months, the FDA granted a standard review.



                                    12

<PAGE>

Item 6. Exhibits and Reports on Form 8-K

(a) Exhibits (numbered in accordance with Item 601 of Regulation S-K).

                                                                   Page Number
                                                                   or
Exhibit                                                            Incorporation
Number               Description                                   By Reference
- ------               -----------                                   ------------

3(i)   Certificate of Incorporation, as amended                      ~~

3(ii)  By-laws, as amended                                           *(4.2)

3(iv)  Amendment to Certificate of Incorporation dated January 5,
       1998                                                          ##3(iv)

10.1   Form of Change of Control Agreements dated as of January
       20, 1995 entered into with the Company's Executive
       Officers                                                      ###(10.2)

10.2   Lease - 300-C Corporate Court, South Plainfield, New
       Jersey                                                        ***(10.3)

10.4   Lease Termination Agreement dated March 31, 1995 for 20
       Kingsbridge Road and 40 Kingsbridge Road, Piscataway, New
       Jersey                                                        ###(10.6)

10.5   Option Agreement dated April 1, 1995 regarding 20
       Kingsbridge Road, Piscataway, New Jersey                      ###(10.7)

10.6   Form of Lease - 40 Cragwood Road, South Plainfield, New
       Jersey                                                        ****(10.9)

10.7   Lease 300A-B Corporate Court, South Plainfield, New Jersey    ++(10.10)

10.8   Stock Purchase Agreement dated March 5, 1987 between the
       Company and Eastman Kodak Company                             ****(10.7)

10.9   Amendment dated June 19, 1989 to Stock Purchase Agreement
       between the Company and Eastman Kodak Company                 **(10.10)

10.10  Form of Stock Purchase Agreement between the Company and
       the purchasers of the Series A Cumulative Convertible
       Preferred Stock                                               +(10.11)

10.11  Amendment to License Agreement and Revised License
       Agreement Between the Company and RCT dated April 25, 1985    +++(10.5)

10.12  Amendment dated as of May 3, 1989 to Revised License
       Agreement Dated April 25, 1985 between the Company and
       Research Corporation                                          **(10.14)

10.13  License Agreement dated September 7, 1989 between the
       Company and Research Corporation Technologies, Inc.
                                                                     **(10.15)

10.14  Master Lease Agreement and Purchase Leaseback Agreement
       dated October 28, 1994 between the Company and Comdisco,
       Inc.                                                          #(10.16)

10.15  Employment Agreement with Peter G. Tombros dated as of
       April 5, 1997                                                 ^^(10.15)

10.16  Stock Purchase Agreement dated as of June 30, 1995            ~(10.16)

10.17  Securities Purchase Agreement dated as of January 31, 1996    ~(10.17)

10.18  Registration Rights Agreements dated as of January 31,
       1996                                                          ~(10.18)

10.19  Warrants dated as of February 7, 1996 and issued pursuant
       to the Securities Purchase Agreement dated as of January
       31, 1996                                                      ~(10.19)

10.20  Securities Purchase Agreement dated as of March 15, 1996      ~~(10.20)

10.21  Registration Rights Agreement dated as of March 15, 1996      ~~(10.21)

10.22  Warrant dated as of March 15, 1996 and issued pursuant to
       the Securities Purchase Agreement dated as of March 15,
       1996                                                          ~~(10.22)

10.23  Amendment dated March 25, 1994 to License Agreement dated
       September 7, 1989 between the Company and Research
       Corporation Technologies, Inc.                                ~~~(10.23)

10.24  Independent Directors' Stock Plan                             ~~~(10.24)

10.25  Stock Exchange Agreement dated February 28, 1997, by and
       between the Company and GFL Performance Fund Ltd.               ^(10.25)

                               13

<PAGE>

10.26  Agreement Regarding Registration Rights Under Registration
       Rights Agreement dated March 10, 1997, by and between the
       Company and Clearwater Fund IV LLC                            ^(10.26)

10.27  Common Stock Purchase Agreement dated June 25, 1998           ^^^(10.27)

10.28  Placement Agent Agreement dated June 25, 1998 with SBC
       Warburg Dillon Read, Inc.                                     ^^^^(10.28)

27.0   Financial Data Schedule                                       o


- ----------
o    Filed herewith.

*    Previously filed as an exhibit to the Company's  Registration  Statement on
     Form S-2 (File No. 33-34874) and incorporated herein by reference thereto.

**   Previously  filed as exhibits to the  Company's  Annual Report on Form 10-K
     for the  fiscal  year  ended  June 30,  1989  and  incorporated  herein  by
     reference thereto.

***  Previously filed as an exhibit to the Company's  Registration  Statement on
     Form S-18  (File  No.  2-88240-NY)  and  incorporated  herein by  reference
     thereto.

**** Previously  filed as exhibits to the  Company's  Registration  Statement on
     Form S-1 (File No.  2-96279)  filed with the  Commission  and  incorporated
     herein by reference thereto.

+    Previously filed as an exhibit to the Company's  Registration  Statement on
     Form S-1 (File No.  33-39391)  filed with the Commission  and  incorporated
     herein by reference thereto.

++   Previously  filed as an exhibit to the Company's Annual Report on Form 10-K
     for the  fiscal  year  ended  June 30,  1993  and  incorporated  herein  by
     reference thereto.

+++  Previously  filed as an exhibit to the Company's Annual Report on Form 10-K
     for the  fiscal  year  ended  June 30,  1985  and  incorporated  herein  by
     reference thereto.

#    Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the quarter  ended  December 31, 1994 and  incorporated  herein by
     reference thereto.

##   Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the quarter  ended  December 31, 1997 and  incorporated  herein by
     reference thereto.

###  Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the  quarter  ended  March  31,  1995 and  incorporated  herein by
     reference thereto.

~    Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the quarter  ended  December 31, 1995 and  incorporated  herein by
     reference thereto.

~~   Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the  quarter  ended  March  31,  1996 and  incorporated  herein by
     reference thereto.

~~~  Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the quarter  ended  December 31, 1996 and  incorporated  herein by
     reference thereto.

^    Previously  filed as an exhibit to the Company's  Quarterly  Report on Form
     10-Q for the  quarter  ended  March  31,  1997 and  incorporated  herein by
     reference thereto.

                               14

<PAGE>

^^   Previously  filed as an exhibit to the Company's Annual Report on Form 10-K
     for the year  ended  June 30,  1997 and  incorporated  herein by  reference
     thereto.

^^^  Previously filed as an exhibit to the Company's  Registration  Statement on
     Form S-3 (File No.  333-58269)  filed with the Commission and  incorporated
     herein by reference thereto.

^^^^ Previously  filed as an exhibit to the Company's Annual Report on Form 10-K
     for the year  ended  June 30,  1998 and  incorporated  herein by  reference
     thereto.

(b)  Reports on Form 8-K.

     None





                               15

<PAGE>

                            SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                     ENZON, INC.
                                     (Registrant)



Date: February 25, 2000              By: /s/ Peter G. Tombros
                                         ----------------------------
                                     Peter G. Tombros
                                     President and Chief Executive
                                     Officer



                                     By: /s/ Kenneth J. Zuerblis
                                         ----------------------------
                                     Kenneth J. Zuerblis
                                     Vice President, Finance and Chief Financial
                                     Officer
                                     (Principal Financial
                                     and Accounting Officer)


                               16


<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
This schedule contains summary financial  information  extracted from the Enzon,
Inc. and Subsidiaries  Consolidated  Condensed  Balance Sheet as of December 31,
1999 and the  Consolidated  Condensed  Statement of Operations for the three and
six months ended December 31, 1999 and is qualified in its entirety by reference
to such financial statements.
</LEGEND>

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                     JUN-30-1999            JUN-30-1999
<PERIOD-END>                          DEC-31-1999            DEC-31-1999
<CASH>                                 23,261,685             23,261,685
<SECURITIES>                                    0                      0
<RECEIVABLES>                           4,701,186              4,701,186
<ALLOWANCES>                                    0                      0
<INVENTORY>                             1,423,507              1,423,507
<CURRENT-ASSETS>                       31,124,745             31,124,745
<PP&E>                                 11,951,345             11,951,345
<DEPRECIATION>                         10,497,269             10,497,269
<TOTAL-ASSETS>                         34,433,238             34,433,238
<CURRENT-LIABILITIES>                  10,016,252             10,016,252
<BONDS>                                         0                      0
                           0                      0
                                   270                    270
<COMMON>                                  372,091                372,091
<OTHER-SE>                             22,607,890             22,607,890
<TOTAL-LIABILITY-AND-EQUITY>           34,433,238             34,433,238
<SALES>                                 3,746,768              6,616,903
<TOTAL-REVENUES>                        3,765,072              6,678,885
<CGS>                                     792,921              1,971,482
<TOTAL-COSTS>                           5,536,328             10,698,143
<OTHER-EXPENSES>                          261,525                559,064
<LOSS-PROVISION>                                0                      0
<INTEREST-EXPENSE>                            926                  3,884
<INCOME-PRETAX>                        (1,509,731)            (3,460,194)
<INCOME-TAX>                                    0                      0
<INCOME-CONTINUING>                    (1,509,731)            (3,460,194)
<DISCONTINUED>                                  0                      0
<EXTRAORDINARY>                                 0                      0
<CHANGES>                                       0                      0
<NET-INCOME>                            (1,509,731)           (3,460,194)
<EPS-BASIC>                                  (0.04)                (0.09)
<EPS-DILUTED>                                (0.04)                (0.09)



</TABLE>


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