IMMUNOGEN INC
10-K/A, 1997-04-08
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
 
================================================================================
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
   
                                  FORM 10-K/A
    
 
   
                                AMENDMENT NO. 1
    
 
[X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
    OF 1934
 
                       FOR THE FISCAL YEAR ENDED JUNE 30, 1996
 
                                       OR
 
[  ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934
 
                         COMMISSION FILE NUMBER 0-17999
 
                                IMMUNOGEN, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                                <C>
                   MASSACHUSETTS                                       04-2726691
          (STATE OR OTHER JURISDICTION OF                           (I.R.S. EMPLOYER
          INCORPORATION OR ORGANIZATION)                           IDENTIFICATION NO.)
</TABLE>
 
   
                   333 PROVIDENCE HIGHWAY, NORWOOD, MA 02062
    
          (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES, INCLUDING ZIP CODE)
 
   
                                 (617) 769-4242
    
              (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)
 
          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  _
 
     Aggregate market value, based upon the closing sale price of the shares as
reported by the Nasdaq National Market, of voting stock held by non-affiliates
at September 9, 1996: $61,230,984 (excludes shares held by Executive Officers,
Directors, and beneficial owners of more than 10% of the Company's Common
Stock). Exclusion of shares held by any person should not be construed to
indicate that such person possesses the power, direct or indirect, to direct or
cause the direction of management or policies of the registrant, or that such
person is controlled by or under common control with the registrant. Common
Stock outstanding at September 9, 1996: 16,959,827 shares.
 
     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]
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
   
     Portions of the registrant's Definitive Proxy Statement for its 1996 Annual
Meeting of Shareholders are incorporated by reference unto Part III of this
Report.
    
 
================================================================================
<PAGE>   2
 
   
ITEM 6.  SELECTED FINANCIAL DATA
    
 
     The following table sets forth consolidated financial data with respect to
the Company for each of the five years in the period ended June 30, 1996. The
information set forth below should be read in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
the consolidated financial statements and related notes included elsewhere in
this Form 10-K report.
 
   
<TABLE>
<CAPTION>
                                                             YEAR ENDED JUNE 30,
                                        -------------------------------------------------------------
                                          1992         1993         1994         1995         1996
                                        ---------   ----------   ----------   ----------   ----------
                                                    (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                     <C>         <C>          <C>          <C>          <C>
Total revenues.......................   $   2,770   $    1,658   $      926   $      512   $      568
Total expenses.......................      18,074       20,274       24,606       20,363      (19,490)
Net loss.............................     (15,344)     (18,634)     (23,690)     (19,857)     (18,923)
Loss per share of common stock.......       (1.58)       (1.76)       (2.09)       (1.58)       (1.32)
Total assets.........................      62,036       46,458       38,384       17,046        8,506
Capital lease obligations,
  less current portion...............         551        1,212        3,338        2,331           37
Stockholders' equity.................      59,080       40,540       29,960       10,123          777
Weighted average shares
  outstanding........................   9,702,988   10,617,109   11,332,194   12,571,134   14,379,064
</TABLE>
    
 
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS
 
OVERVIEW
 
     Since inception, ImmunoGen has been primarily engaged in research and
development of immunoconjugate products which the Company believes have
significant commercial potential as human therapeutics. The major sources of the
Company's working capital have been the proceeds of equity and convertible debt
financings, license fees and income earned on investment of those funds. The
Company expects no revenues to be derived from product sales for the foreseeable
future.
 
     In the past two fiscal years the Company has successfully reduced its
operating costs and obtained additional funds for working capital purposes. The
following is a summary of management actions taken during this period to reduce
operating costs. In December 1994, the Company implemented a restructuring plan,
which included halting operations at two of its facilities, reducing or
eliminating certain areas of research and focusing its clinical efforts on its
lead product. In addition, effective September 1, 1995, the Company subleased
approximately 82% of one of its Cambridge, Massachusetts facilities and leased
certain related equipment for a term which initially was to expire in February
1998. In July 1996, the Company signed an amendment to this sublease agreement,
increasing the subleased space from 82% to 100% of the facility and extending
the term of the sublease to February 1999 with options to further extend the
sublease term to February 2000. This amendment is expected to become effective
on or about October 1, 1996. Total net receipts under the amended sublease
agreement, which are credited to reduce operating expenses, are expected to
total approximately $2.3 million through February 1999, of which approximately
$498,000 was received by the Company in fiscal 1996.
 
     In a further cost reduction effort, the Company assigned its facility and
equipment leases related to one of its production facilities, located in Canton,
Massachusetts, to another biotechnology company, effective January 1, 1996. The
Company estimates its savings in monthly operating expenses from this
transaction to be approximately $140,000.
 
     The Company has been unprofitable since inception and expects to incur net
losses over the next several years, if it is able to raise sufficient working
capital to continue operations. The Company's cash resources at June 30, 1996
were approximately $2.8 million, and the Company continues actively to seek
additional capital. While the Company remains hopeful that it will be able to
consummate an additional financing transaction in the near term, no assurance
can be given that such financing will be available to the Company on acceptable
terms, if at all. If the Company is unable to obtain financing on acceptable
terms in order to maintain operations through the fiscal year, it could be
forced to curtail or discontinue its operations.
 
                                        2
<PAGE>   3
 
RESULTS OF OPERATIONS
 
     Revenues in fiscal 1994 and 1995 were derived principally from interest
income on the proceeds of the Company's equity offerings, with smaller amounts
of development revenues received under the Small Business Innovation Research
Program of the National Institutes of Health ("SBIR Program"). In 1996, revenues
were derived principally under the SBIR Program, with smaller amounts received
as interest income and as licensing fees pursuant to two licensing agreements.
In addition, in all three years revenues included a gain on sale of assets which
resulted from a sale/leaseback agreement for equipment at the Canton facility
executed in fiscal 1994 which had been deferred and recorded as other income
through December 1995.
 
     Interest income decreased 45% from approximately $840,000 in fiscal 1994 to
approximately $460,000 in fiscal 1995 and then decreased 73% to approximately
$124,000 in fiscal 1996. These decreases are attributable to the lower cash
balances available for investment between these periods. In fiscal 1996, the
decrease in interest earned on cash available for investment was partially
offset by interest earned on amounts due from the assignee of its Canton
production facility.
 
   
     The Company's total expenses decreased 17% from approximately $24.6 million
in fiscal 1994 to approximately $20.4 million in fiscal 1995 and then decreased
4% to approximately $19.5 million in fiscal 1996. Exclusive of the one-time
charge to dispose of the Canton assets (approximately $2.0 million) and the
financing costs associated with the issuances of debt securities which were
charged to interest expense (approximately $5.6 million), the decrease between
fiscal 1995 and 1996 operating expenses would have been substantially greater.
    
 
     Research and development costs constituted the primary component of the
Company's total expenses (81%, 83% and 56% in fiscal 1994, 1995 and 1996,
respectively), decreasing from approximately $19.9 million in fiscal 1994 to
approximately $16.9 million in fiscal 1995, and then decreasing to approximately
$9.6 million in fiscal 1996. The 16% decrease between fiscal 1994 and fiscal
1995 is the result of the Company's restructuring plan implemented in December
1994, offset in part by increased costs associated with the Company's 72%-owned
subsidiary, Apoptosis Technology, Inc. ("ATI"), and increased non-cash
depreciation and amortization charges associated with the capital expenditures
made in prior periods. A planned substantial reduction in raw materials
purchases in fiscal 1995 also contributed to the decrease in expenses. The 43%
decrease between fiscal 1995 and 1996 is a consequence of the Company's
continuing cost reduction efforts begun in calendar year 1994.
 
     General and administrative expenses decreased 33% from approximately $4.5
million in fiscal 1994 to approximately $3.0 million in fiscal 1995, and then
decreased 42% to approximately $1.8 million in fiscal 1996. The decrease from
fiscal 1994 to fiscal 1995 represented savings associated with the restructuring
plan and reductions in management and administrative staff in the second and
third quarters of calendar 1994, offset in part by the restructuring charges
incurred. The decrease from fiscal 1995 to fiscal 1996 is a result of the
Company's continuing cost reduction efforts begun in calendar year 1994.
 
   
     Interest expense increased 193% from approximately $174,000 in fiscal 1994
to approximately $510,000 in fiscal 1995, and then increased to approximately
$6.1 million in fiscal 1996. The increase between fiscal 1994 and 1995 was due
to the utilization of capital lease arrangements to finance certain equipment
and leasehold improvements at its Canton production facility. The increase
between fiscal 1995 and fiscal 1996 was due primarily to the substantial costs
incurred in conjunction with the issuances of convertible debentures, including
a non-cash charges to interest of approximately $2.7 million related to warrants
issued in connection with the Company's fiscal 1996 issuance of convertible
debentures, $2.4 million related to a discount in the convertible debenture, and
$511,000 of cash fees paid to third parties in connection with its debenture
financings.
    
 
LIQUIDITY AND CAPITAL RESOURCES
 
     Since July 1, 1993, the Company has financed its operating deficit of
approximately $60.1 million from various sources, including proceeds from its
fiscal 1994 public offering, issuances in fiscal 1996 of convertible
 
                                        3
<PAGE>   4
 
debentures, amounts received pursuant to its fiscal 1996 assignment of leases
and from the exercise of stock options.
 
     In February 1994, the Company sold in a public offering 2,012,500 shares of
its Common Stock. Net proceeds to the Company amounted to $13.2 million. In
March 1994, the Company executed a sale/leaseback agreement to finance
approximately $4.0 million of equipment at the Canton facility. At June 30,
1994, all monies under this agreement had been received. The transaction
included warrants to purchase 26,738 shares of common stock which expire in
April 1999.
 
     Effective January 1, 1996, the Company assigned its facility and equipment
leases on one of its production facilities, located in Canton, Massachusetts, to
another biotechnology company. Under the terms of the agreements, the assignee
has assumed all payment obligations under the leases and, in addition, will make
cash payments to the Company totaling approximately $2.4 million at various
dates to July 1999, of which approximately $786,000 had been received through
June 30, 1996.
 
     In August 1995, the Company issued $3.6 million of 7% subordinated
convertible debentures in a private placement to a small number of overseas
investors. As of March 31, 1996, all of these debentures plus accrued interest
thereon had been converted into 2,753,269 shares of the Company's Common Stock.
 
     In March 1996, the Company issued $5.0 million of 9% convertible debentures
to a single investor in a private placement. This amount was received by the
Company in two installments -- $2.5 million was received in March 1996 and the
remaining $2.5 million was received in June 1996. As of June 30, 1996, the first
installment, together with accrued interest thereon, was converted into
1,018,000 shares of the Company's $.01 par value per share Common Stock. In
connection with that conversion, warrants to purchase 509,000 and 500,000 shares
of the Company's Common Stock were issued to the debenture holder. These
warrants have exercise prices of $4.00 and $6.00, respectively, and expire in
2001. Also in connection with the issuance of the 9% convertible debentures, the
Company issued warrants to purchase a total of 250,000 shares of the Company's
Common Stock to a third party as a finder's fee. These warrants have an exercise
price of $3.105 and expire in 2003.
 
     On June 28, 1996, ImmunoGen and its subsidiary, ATI, satisfied obligations
to Dana-Farber Cancer Institute ("Dana-Farber") totaling approximately $1.3
million by issuing to Dana-Farber a convertible debenture (see Note E to the
Consolidated Financial Statements). Pursuant to the settlement agreement, the
Company issued to Dana-Farber an 11.5% $1,312,943 debenture convertible into
shares of ImmunoGen Common Stock at a conversion price based on the market price
for the Company's Common Stock at the time of conversion. Shortly thereafter,
the Company filed a registration statement under the Securities Act of 1933 to
register the resale by Dana-Farber of the Common Stock issuable upon conversion
of the debenture, and in July 1996 the debenture and accrued interest thereon
were converted into 351,662 shares of the Company's Common Stock.
 
     Although in the period since July 1, 1993 approximately $8.1 million was
expended on property and equipment, no significant amounts were expended on
property and equipment in fiscal 1996 or are expected to be expended on property
and equipment in fiscal 1997.
 
     ImmunoGen was committed under its agreements with ATI to provide ATI with
$3.0 million in research and development services and $2.0 million in cash
equity contributions over a three-year period. At June 30, 1995 these
obligations had been fulfilled by the Company. ImmunoGen has also agreed to
obtain or furnish an additional $3.0 million in equity for ATI on such terms and
conditions as may be mutually agreed to by ATI and the providers of such equity.
As of June 30, 1996, amounts owed by ATI to ImmunoGen approximated $10.0
million. The Company intends to convert a majority of this amount into equity of
ATI, thereby satisfying the agreement to provide an additional $3.0 million in
equity. The Company anticipates that approximately $452,000 of additional
funding will be required by ATI during fiscal year 1997 to satisfy certain
existing contractual obligations.
 
     The Company anticipates that its existing capital resources will enable it
to maintain its current and planned operations through October 1996. Because of
its continuing losses from operations, the Company will be required to obtain
additional capital to satisfy its ongoing capital needs and to continue its
operations.
 
                                        4
<PAGE>   5
 
Although management continues to pursue additional funding arrangements, no
assurance can be given that such financing will in fact be available to the
Company. If the Company is unable to obtain financing on acceptable terms in
order to maintain operations through the fiscal year, it could be forced to
curtail or discontinue its operations.
 
CERTAIN FACTS THAT MAY AFFECT FUTURE RESULTS OF OPERATIONS
 
     This report contains certain forward-looking statements as that term is
defined in the Private Securities Litigation Reform Act of 1995. Such statements
are based on management's current expectations and are subject to a number of
factors and uncertainties which could cause actual results to differ materially
from those described in the forward-looking statements. The Company cautions
investors that there can be no assurance that actual results or business
conditions will not differ materially from those projected or suggested in such
forward-looking statements as a result of various factors, including, but not
limited to, the following: the early stage of the Company's initial product
development and lack of product revenues; the Company's history of operating
losses and accumulated deficit; the Company's limited financial resources and
uncertainty as to the availability of additional capital to fund its development
on acceptable terms, if at all; the Company's lack of commercial manufacturing
experience and commercial sales, distribution and marketing capabilities;
reliance on suppliers of ricin and antibodies necessary for production of the
products and technologies; the potential development by competitors of competing
products and technologies; the Company's dependence on potential collaborative
partners, and the lack of assurance that the Company will receive any funding
under such relationships to develop and maintain strategic alliances; the lack
of assurance regarding patent and other protection for the Company's proprietary
technology; governmental regulation of the Company's activities, facilities,
products and personnel; the dependence on key personnel; uncertainties as to the
extent of reimbursement for the costs of the Company's potential products and
related treatment by government and private health insurers and other
organizations; the potential adverse impact of government-directed health care
reform; the risk of product liability claims; and general economic conditions.
As a result, the Company's future development efforts involve a high degree of
risk. For further information, refer to the more specific risks and
uncertainties discussed throughout this Annual Report on Form 10-K.
 
                                        5
<PAGE>   6
 
ITEM 8.  FINANCIAL STATEMENTS
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
   
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Report of Independent Accountants.....................................................    7
Consolidated Financial Statements:
  Consolidated Balance Sheets at June 30, 1995 and 1996...............................    8
  Consolidated Statements of Operations for the Years
     Ended June 30, 1994, 1995 and 1996...............................................    9
  Consolidated Statements of Stockholders' Equity
     for the Years Ended June 30 1994, 1995 and 1996..................................   10
  Consolidated Statements of Cash Flows for the Years
     Ended June 30 1994, 1995 and 1996................................................   11
  Notes to Consolidated Financial Statements..........................................   12
</TABLE>
    
 
                                        6
<PAGE>   7
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors and Shareholders of ImmunoGen, Inc.:
 
   
     We have audited the accompanying consolidated balance sheets of ImmunoGen,
Inc. as of June 30, 1995 and 1996, and the related consolidated statements of
operations, stockholders' equity and cash flows for each of the three years in
the period ended June 30, 1996, which financial statements have been restated,
as described in Note K. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
    
 
     We conducted our audits in accordance with generally accepted auditing
standards. These 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 financial statements referred to above present fairly,
in all material respects, the consolidated financial position of ImmunoGen, Inc.
as of June 30, 1995 and 1996 and the consolidated results of its operations and
its cash flows for each of the three years in the period ended June 30, 1996, in
conformity with generally accepted accounting principles.
 
     The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern. As discussed in Note A, the Company
has suffered recurring losses from operations, at June 30, 1996 the Company has
cash resources of $2.8 million, which management anticipates is sufficient to
maintain current and planned operations only through October 1996 and,
therefore, requires significant additional financing. These factors raise
substantial doubt about the Company's ability to continue as a going concern.
Management's plans in regard to these matters are also described in Note A. The
financial statements do not include any adjustments that might result from the
outcome of this uncertainty.
 
   
<TABLE>
<S>                                               <C>
Boston, Massachusetts

August 28, 1996, except for Note K, as to         COOPERS & LYBRAND L.L.P.
which the date is April 4, 1997.
</TABLE>
    
 
                                        7
<PAGE>   8
 
                                IMMUNOGEN, INC.
 
                          CONSOLIDATED BALANCE SHEETS
                          AS OF JUNE 30, 1995 AND 1996
 
   
<TABLE>
<CAPTION>
                                                                           JUNE 30,
                                                                -------------------------------
                                                                    1995              1996
                                                                -------------     -------------
<S>                                                             <C>               <C>
ASSETS
Cash and cash equivalents.....................................  $   3,047,236     $   2,796,636
Prepaids and other current assets.............................        293,852           163,280
                                                                -------------     -------------
     Total current assets.....................................      3,341,088         2,959,916
                                                                -------------     -------------
Property and equipment, net of accumulated depreciation.......     13,621,383         4,163,416
Note receivable...............................................       --               1,338,929
Other assets..................................................         83,700            43,700
                                                                -------------     -------------
          Total assets........................................  $  17,046,171     $   8,505,961
                                                                 ============      ============
 
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable..............................................      2,229,003           733,446
Accrued compensation..........................................        397,153           233,515
Other accrued liabilities.....................................        898,073           832,573
Current portion of capital lease obligations..................        942,749           141,533
                                                                -------------     -------------
     Total current liabilities................................      4,466,978         1,941,067
                                                                -------------     -------------
Capital lease obligations.....................................      2,330,680            37,068
Convertible debentures........................................       --               5,750,443
Other non-current liabilities.................................        125,354          --
Commitments (Notes H and I)
Redeemable convertible preferred stock, $.01 par value;
  authorized 277,080 shares; none issued......................       --                --
Stockholders' equity:
  Common stock, $.01 par value; authorized 20,000,000 and
  30,000,000 as of June 30, 1995 and 1996, respectively;
  issued and outstanding 12,578,606 and 16,599,855 shares as
  of June 30, 1995 and 1996, respectively.....................        125,786           165,999
  Additional paid-in capital..................................    118,988,736       128,525,884
                                                                -------------     -------------
                                                                  119,114,522       128,691,883
  Accumulated deficit.........................................   (108,991,363)     (127,914,500)
                                                                -------------     -------------
     Total stockholders' equity...............................     10,123,159           777,383
                                                                -------------     -------------
          Total liabilities and stockholders' equity..........  $  17,046,171     $   8,505,961
                                                                 ============      ============
</TABLE>
    
 
    The accompanying notes are an integral part of the financial statements.
 
                                        8
<PAGE>   9
 
                                IMMUNOGEN, INC.
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                FOR THE YEARS ENDED JUNE 30, 1994, 1995 AND 1996
 
   
<TABLE>
<CAPTION>
                                                                      JUNE 30,
                                                   ----------------------------------------------
                                                       1994             1995             1996
                                                   ------------     ------------     ------------
<S>                                                <C>              <C>              <C>
Revenues:
  Development fees...............................  $     74,700                      $    398,289
  Interest.......................................       839,005     $    459,293          124,208
  Licensing......................................       --               --                18,070
  Other..........................................        12,504           52,571           27,856
                                                   ------------     ------------     ------------
          Total revenues.........................       926,209          511,864          568,423
                                                   ------------     ------------     ------------
Expenses:
  Research and development.......................    19,929,474       16,819,082        9,622,132
  General and administrative.....................     4,502,259        3,034,087        1,769,414
  Interest.......................................       173,867          509,700        6,096,894
  Loss on disposal of assets.....................       --               --             2,001,480
                                                   ------------     ------------     ------------
          Total expenses.........................    24,605,600       20,362,869       19,489,920
                                                   ------------     ------------     ------------
Loss before income taxes.........................   (23,679,391)     (19,851,005)     (18,921,497)
Income tax expense...............................        11,075            6,063            1,640
                                                   ------------     ------------     ------------
Net loss.........................................  $(23,690,466)    $(19,857,068)    $(18,923,137)
                                                    ===========      ===========      ===========
Loss per common share............................  $      (2.09)    $      (1.58)    $      (1.32)
                                                    ===========      ===========      ===========
Shares used in computing loss per share
  amounts........................................    11,332,194       12,571,134       14,379,064
                                                    ===========      ===========      ===========
</TABLE>
    
 
    The accompanying notes are an integral part of the financial statements.
 
                                        9
<PAGE>   10
 
                                IMMUNOGEN, INC.
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                FOR THE YEARS ENDED JUNE 30, 1994, 1995 AND 1996
 
   
<TABLE>
<CAPTION>
                                                 COMMON STOCK
                                   ----------------------------------------
                                                                ADDITIONAL                           TOTAL
                                                                 PAID-IN         ACCUMULATED      STOCKHOLDERS'
                                     SHARES        AMOUNT        CAPITAL           DEFICIT           EQUITY
                                   -----------    --------     ------------     -------------     ------------
<S>                                <C>            <C>          <C>              <C>               <C>
Balance at June 30, 1993.........   10,498,793    $104,988     $105,878,986     $ (65,443,829)    $ 40,540,145
                                    ----------    --------     ------------     -------------     ------------
  Issuance of common stock.......    2,055,938      20,559       13,012,864          --             13,033,423
  Issuance of common stock
    warrants.....................      --            --              76,738          --                 76,738
  Net loss.......................      --            --             --            (23,690,466)     (23,690,466)
                                    ----------    --------     ------------     -------------     ------------
Balance at June 30, 1994.........   12,554,731     125,547      118,968,588       (89,134,295)      29,959,840
                                    ----------    --------     ------------     -------------     ------------
  Stock options excercised.......       23,875         239           20,148          --                 20,387
  Net loss.......................      --            --             --            (19,857,068)     (19,857,068)
                                    ----------    --------     ------------     -------------     ------------
Balance at June 30, 1995.........   12,578,606     125,786      118,988,736      (108,991,363)      10,123,159
                                    ----------    --------     ------------     -------------     ------------
  Stock options excercised.......      168,500       1,685          120,900          --                122,585
  Conversion of convertible
    debentures...................    3,852,749      38,528        6,722,763          --              6,761,291
  Issuance of common stock
    warrants.....................      --            --           2,693,485          --              2,693,485
  Net loss.......................      --            --             --            (18,923,137)     (18,923,137)
                                    ----------    --------     ------------     -------------     ------------
Balance at June 30, 1996.........   16,599,855    $165,999     $128,525,884     $(127,914,500)    $    777,383
                                    ==========    ========     ============     =============     ============
</TABLE>
    
 
    The accompanying notes are an integral part of the financial statements.
 
                                       10
<PAGE>   11
 
                                IMMUNOGEN, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                FOR THE YEARS ENDED JUNE 30, 1994, 1995 AND 1996
 
   
<TABLE>
<CAPTION>
                                                                                  JUNE 30,
                                                                 ------------------------------------------
                                                                     1994           1995           1996
                                                                 ------------   ------------   ------------
<S>                                                              <C>            <C>            <C>
Cash flows from operating activities:
  Net loss.....................................................  $(23,690,466)  $(19,857,068)  $(18,923,137)
  Adjustments to reconcile net loss to net cash used for
    operating activities:
    Depreciation and amortization..............................     2,031,477      3,350,685      2,516,231
    Loss on disposal of facility...............................         4,888        (15,630)     2,001,480
    Amortization of discount on convertible
      debentures charged to interest expense...................       --             --           5,398,352
    Amortization of debt issuance costs........................       --             --             511,000
    Other......................................................       --             --              25,674
    Change in operating assets and liabilities:
      Other current assets.....................................        18,988        335,957        267,168
      Note receivable..........................................       --             --             (48,395)
      Other assets.............................................       392,015        --             --
      Accounts payable.........................................      (566,100)        19,852       (288,690)
      Accrued compensation.....................................       531,073       (619,941)      (163,638)
      Accrued construction costs...............................      (616,816)       --             --
      Other accrued liabilities................................       176,728         48,275         98,777
      Other non-current liabilities............................       250,709        --             (27,856)
                                                                 ------------   ------------   ------------
    Net cash used for operating activities.....................   (21,467,504)   (16,737,870)    (8,633,034)
                                                                 ------------   ------------   ------------
Cash flows from investing activities:
  Purchase of property and equipment...........................    (7,628,278)      (477,288)       (23,608)
  Proceeds from sale/maturity of marketable securities.........    40,967,462     30,505,763        --
  Purchase of marketable securities............................   (35,685,475)   (10,925,635)       --
                                                                 ------------   ------------   ------------
    Net cash (used for) provided by investing activities.......    (2,346,291)    19,102,840        (23,608)
                                                                 ------------   ------------   ------------
Cash flows from financing activities:
  Proceeds from convertible debentures.........................       --             --           8,600,000
  Debt issuance costs..........................................       --             --            (511,000)
  Stock issuances, net.........................................    13,033,423         20,387        122,585
  Proceeds from sale/leaseback transactions....................     4,015,330        --             --
  Principal payments on capital lease obligations..............    (1,197,999)      (910,510)      (455,543)
  Proceeds from assignment of lease............................       --             --             650,000
                                                                 ------------   ------------   ------------
    Net cash provided by (used for) financing activities.......    15,850,754       (890,123)     8,406,042
                                                                 ------------   ------------   ------------
Net change in cash and cash equivalents........................    (7,963,041)     1,474,847       (250,600)
                                                                 ------------   ------------   ------------
Cash and cash equivalents, beginning balance...................     9,535,430      1,572,389      3,047,236
                                                                 ------------   ------------   ------------
Cash and cash equivalents, ending balance......................  $  1,572,389   $  3,047,236   $  2,796,636
                                                                 ============   ============   ============
Supplemental disclosure of cash flow information:
  Cash paid for interest.......................................  $    156,669   $    513,635   $    684,325
                                                                 ============   ============   ============
  Cash paid (refunded) for income taxes........................  $     12,310   $     (4,390)  $      5,000
                                                                 ============   ============   ============
Supplemental disclosure of noncash financing activities:
  Conversion of convertible debentures.........................  $    --        $    --        $  6,653,340
                                                                 ============   ============   ============
  Conversion of accounts payable to 11.5% convertible
    debenture..................................................  $    --        $    --        $  1,312,943
                                                                 ============   ============   ============
  Assignment of capital lease obligations......................  $    --        $    --        $  2,639,285
                                                                 ============   ============   ============
  Note receivable issued in relation to assignment of lease....  $    --        $    --        $  1,338,929
                                                                 ============   ============   ============
</TABLE>
    
 
    The accompanying notes are an integral part of the financial statements.
 
                                       11
<PAGE>   12
 
                                IMMUNOGEN, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
A. NATURE OF BUSINESS AND PLAN OF OPERATION:
 
     ImmunoGen, Inc. ("the Company") was incorporated in Massachusetts on March
27, 1981. The Company was formed to develop, produce and market commercial
cancer and other pharmaceuticals based on molecular immunology. The Company
continues research and development of its various products, and expects no
revenues to be derived from product sales for the foreseeable future.
 
     The Company has been unprofitable since inception and expects to incur net
losses over the next several years. The Company's cash resources at June 30,
1996 were approximately $2.8 million, and the Company continues actively to seek
additional capital by pursuing one or more financing transactions and/or
strategic partnering arrangements.
 
     In the past two fiscal years the Company has successfully reduced its
operating costs and obtained additional funds for working capital purposes. The
following is a summary of management actions during this period. In December
1994 the Company implemented a restructuring plan, which included halting
operations at two of its facilities, reducing or eliminating certain areas of
research and focusing its clinical efforts on its lead product. In addition,
effective September 1, 1995, the Company subleased approximately 82% of one of
its Cambridge, Massachusetts facilities and leased certain related equipment for
a term which initially was to expire in February 1998. In July 1996, the Company
signed an amendment to this sublease agreement, increasing the subleased space
from 82% to 100% of the facility and extending the term of the sublease to
February 1999 with options to further extend the sublease term to February 2000.
This amendment is expected to become effective on or about October 1, 1996.
Total net receipts under the amended sublease agreement, which are credited to
operating expenses, are expected to total approximately $2.3 million through
February 1999, of which approximately $498,000 was received by the Company in
fiscal 1996.
 
     In addition, effective January 1, 1996 the Company assigned its leases on
its Canton, Massachusetts ("Canton") facility and equipment to another
biotechnology company (see Note D).
 
     In August 1995 the Company issued $3.6 million of 7% subordinated
convertible debentures in a private placement to a small number of overseas
investors. As of March 31, 1996, all of these debentures plus accrued interest
thereon had been converted to 2,753,269 shares of the Company's Common Stock. In
addition, 81,480 shares of the Company's Common Stock were issued to a third
party as a finder's fee in connection with the issuance of the debentures.
 
     In March 1996 the Company sold $5.0 million of 9% convertible debentures in
a private placement. This amount was received by the Company in two installments
of $2.5 million in March 1996 and $2.5 million in June 1996. As of June 30,
1996, the first installment, together with accrued interest thereon, was
converted into 1,018,000 shares of the Company's Common Stock. In conjunction
with that conversion, warrants to purchase 509,000 shares and 500,000 shares of
the Company's Common Stock were issued to the debenture holder. These warrants
have exercise prices of $4.00 and $6.00, respectively, and expire in 2001. Also
in connection with the issuance of the 9% convertible debentures, the Company
issued warrants to purchase a total of 250,000 shares of the Company's Common
Stock to a third party as a finder's fee. These warrants have an exercise price
of $3.105 and expire in 2003.
 
     On June 28, 1996, ImmunoGen and its subsidiary, Apoptosis Technology, Inc.
("ATI"), satisfied obligations to Dana-Farber Cancer Institute ("Dana-Farber")
totaling approximately $1.3 million by issuing to Dana-Farber a convertible
debenture (see Note E). Pursuant to the settlement agreement, on June 28, 1996
the Company issued to Dana-Farber an 11.5% $1,312,943 debenture convertible into
shares of ImmunoGen Common Stock at a conversion price based on the market price
for the Common Stock at the time of conversion. Shortly thereafter, the Company
filed a registration statement under the Securities Act of 1933 to register the
resale by Dana-Farber of the Common Stock issuable upon conversion of the
debenture, and in July 1996 the debenture and accrued interest thereon,
aggregating $1,318,734, were converted into 351,662 shares of the Company's
Common Stock.
 
                                       12
<PAGE>   13
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The Company anticipates that its existing capital resources will enable it
to maintain its current and planned operations through October 1996. Because of
its continuing losses from operations, the Company will be required to obtain
additional capital in the short term to satisfy its ongoing capital needs and to
continue its operations. Although, as noted above, management continues to
pursue additional funding arrangements and/or strategic partners, no assurance
can be given that such financing will in fact be available to the Company. If
the Company is unable to obtain financing on acceptable terms in order to
maintain operations, it could be forced to curtail or discontinue its
operations. The financial statements do not include any adjustments that might
result from the outcome of this uncertainty.
 
B. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
 
  Principles of Consolidation
 
     The consolidated financial statements include the accounts of the Company
and its wholly owned subsidiary, ImmunoGen Securities Corp. (established in
December 1989), and its 72%-owned subsidiary, ATI (established in January 1993)
(see Note E). All intercompany transactions and balances have been eliminated.
 
     Certain reclassifications have been made to the prior year financial
statements to conform to the 1996 presentation.
 
  Use of Estimates
 
     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.
 
  Research and Development Costs
 
     Research and development costs are expensed as incurred.
 
  Cash, Cash Equivalents and Marketable Securities
 
     The Company considers all investments purchased with maturity dates of
three months or less from the date of acquisition to be cash equivalents.
 
     Cash and cash equivalents include, at cost plus accrued interest which
approximates market value, $3,047,236 and $2,796,636 of money market funds,
demand notes and repurchase agreements at June 30, 1995 and 1996, respectively.
 
  Financial Instruments and Concentration of Credit Risk
 
     The Company has outstanding convertible debentures with maturities of one
to four years; however, management believes the carrying amount of these
convertible debentures is a reasonable estimate of the fair value because of the
historically short holding period prior to conversion of the Company's
convertible debentures.
 
     The Company has a note receivable from a biotechnology company with
payments due at various dates to July 1999. Management believes the carrying
amount of this note receivable (on a discounted basis) is a reasonable estimate
of the fair value based on the current rates offered to the Company for debt
with similar maturities.
 
                                       13
<PAGE>   14
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The Company minimizes the risk associated with concentration of credit by
utilizing the services of more than one custodian for its cash and assuring that
financial instruments purchased by its cash managers include only high-grade,
low-risk investments. At June 30, 1995 and 1996, those investments included
various U.S. Government securities, money market investments with major
financial institutions and cash on deposit with major banks.
 
  Property and Equipment
 
     Property and equipment are stated at cost. The Company provides for
depreciation based upon expected useful lives using the straight-line method
over the following estimated useful lives:
 
<TABLE>
        <S>                                                    <C>
        Machinery and equipment..............................  3-5 years
        Computer hardware and software.......................  5 years
        Furniture and fixtures...............................  5 years
        Leasehold improvements...............................  Shorter of lease term or
                                                               estimated useful life
</TABLE>
 
     Maintenance and repairs are charged to expense as incurred. Upon retirement
or sale, the cost of disposed assets and the related accumulated depreciation
are removed from the accounts and any resulting gain or loss is credited or
charged to operations. Gains recorded under sale/leaseback arrangements are
deferred and amortized to operations over the life of the lease.
 
  Income Taxes
 
     The Company uses the liability method whereby the deferred tax liabilities
and assets are recognized based on temporary differences between the financial
statement and tax basis of assets and liabilities using current statutory tax
rates. A valuation allowance against net deferred tax assets is recorded if,
based on the available evidence, it is more likely than not that some or all of
the deferred tax assets will not be realized.
 
     Management evaluates on a quarterly basis the recoverability of the
deferred tax assets and the level of the valuation allowance. At such time as it
is determined that it is more likely than not that deferred tax assets are
realizable, the valuation allowance will be appropriately reduced.
 
  Impairment of Long-Lived Assets
 
     In fiscal year 1996, the Company adopted Statement of Financial Accounting
Standards (SFAS) No. 121, "Accounting for Impairment of Long-Lived Assets to Be
Disposed Of" which requires the evaluation of recoverability in the event that
facts and circumstances indicate that the cost of a long-lived asset may be
impaired. Adoption of the Standard had no effect on the 1996 financial
statements.
 
     The Company periodically evaluates the potential impairment of its
long-lived assets whenever events or changes in circumstances indicate that the
carrying amount of an asset may not be recoverable. At the occurrence of a
certain event or change in circumstances, the Company evaluates the potential
impairment of an asset based on estimated future undiscounted cash flows. In the
event impairment exists, the Company will measure the amount of such impairment
based on the present value of estimated expected future cash flows using a
discount rate commensurate with the risks involved. Based on management's
assessment as of June 30, 1996, the Company has determined that no impairment of
long-lived assets exists.
 
  Recent Accounting Pronouncements
 
     In October 1995, the Financial Accounting Standards Board issued SFAS No.
123, "Accounting for Stock-Based Compensation" ("SFAS No. 123"), which
encourages companies to recognize compensation expense in the income statement
based on the fair value of the underlying common stock at the date the
 
                                       14
<PAGE>   15
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
awards are granted. However, it will permit continued accounting under
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees" ("APB Opinion 25"), accompanied by a disclosure in the footnotes to
the financial statements of the pro forma effects on net income and earnings per
share had the new accounting rules been applied. The statement is effective for
fiscal year 1997. The Company has determined to continue accounting for
stock-based compensation under APB Opinion 25, and thus will adopt the
disclosure-only alternative permitted under SFAS 123. The Company has not
determined the impact of the pro forma adjustments on its net loss or loss per
share.
 
C. LOSS PER COMMON SHARE:
 
     Net loss per common share is based on the weighted average number of common
shares outstanding during the periods. Common share equivalents have not been
included because their effect would be anti-dilutive. Fully diluted earnings per
share are the same as primary earnings per share.
 
   
     If the conversions of convertible debentures into common shares of the
Company which occurred during 1996 (see Note A) had occurred at the beginning of
the fiscal year, then the weighted average number of shares outstanding used to
calculate the loss per share would have been 16,485,630 and the loss per share
would have been $1.15.
    
 
   
     If the above conversions described above plus the conversion in July 1996
(see Note A) had occurred at the beginning of the fiscal year, the weighted
average number of shares outstanding used to calculate the loss per share would
have been 16,837,292 and the loss per share would have been $1.12.
    
 
D. NOTE RECEIVABLE:
 
     Effective January 1, 1996, the Company assigned its leases on its Canton
facility and equipment to another biotechnology company. Under the terms of the
agreements, the assignee has assumed all payment obligations under the leases,
which amount to approximately $116,000 per month and, in addition, will make
cash payments to the Company totaling approximately $2.4 million at various
dates to July 1999, of which approximately $786,000 has been received through
June 30, 1996. Amounts due the Company from the assignee under these agreements
were discounted to their present value using a risk adjusted discount rate of
9%. The Company is accreting interest income over the life of the note and,
accordingly, the note receivable balance in the Company's consolidated balance
sheets as of June 30, 1996 reflects the original discounted present value of
$1,291,000 plus accreted interest of approximately $48,000.
 
E. AGREEMENTS:
 
  ImmunoGen/Dana-Farber Agreement
 
     The Company has a long-standing research and license agreement with
Dana-Farber, a Massachusetts not-for-profit corporation. As part of the research
and license agreement, the Company has agreed to fund certain research and
development projects conducted by Dana-Farber in relation to the development and
eventual commercialization of certain biologicals to be used in the treatment of
certain forms of cancer. In fiscal years 1994, 1995 and 1996 the Company
incurred research and development expenses of approximately $567,000, $225,000
and $40,000, respectively, in connection with that agreement. To the extent that
any invention develops at Dana-Farber which derived its principal support and
funding from the Company, the Company has the exclusive right to use such
invention. Also as part of the arrangement, the Company is required to pay to
Dana-Farber, when product sales commence, certain royalties based on a formula
stipulated in the agreement. The Company owed Dana-Farber approximately $1.2
million and $0.9 million at June 30, 1995 and June 28, 1996, respectively, for
work performed under the agreement. Of the balance due under this agreement as
of June 28, 1996, the Company accrued interest of approximately $106,000 (which
includes interest retroactive to 1993 on ImmunoGen's obligation to Dana-Farber
plus interest on ATI's $335,100
 
                                       15
<PAGE>   16
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
obligation to DFCI), and issued a $1.3 million 11.5% convertible debenture as
described in Note A to these financial statements in payment thereof.
 
  ATI/Dana-Farber Agreements
 
     ATI is a joint venture between ImmunoGen and Dana-Farber established to
develop therapeutics based on apoptosis technology developed at Dana-Farber. In
January 1993, the Company purchased 7,000 shares of Class A Preferred Stock of
ATI. The Preferred Stock is voting stock and carries a liquidation preference
over the common stock. The Company's investment represents 72% of the currently
authorized equity of ATI and, accordingly, is consolidated. In addition, the
Company has a right of first refusal to purchase any ATI shares which may be
offered for sale by the other current stockholders of ATI. If ATI has not
concluded a public offering of its stock for at least $5.0 million prior to
January 11, 1998, the other stockholders (currently representing 2,765 shares of
common stock) of ATI can require ImmunoGen to purchase, or ImmunoGen can require
such stockholders to sell, their shares in ATI at a predetermined price. At
ImmunoGen's option, the shares of common stock of ATI can be paid for in cash or
by delivery of shares of ImmunoGen Common Stock.
 
     ImmunoGen was committed to provide ATI with $3.0 million in research and
development services and $2.0 million in cash equity contributions over a
three-year period. At June 30, 1995, these obligations had been fulfilled by the
Company. ImmunoGen has also agreed to obtain or furnish an additional $3.0
million in equity for ATI on such terms and conditions as may be mutually agreed
to by ATI and the providers of such additional equity. As of June 30, 1996,
amounts owed by ATI to ImmunoGen approximated $10.0 million. The Company intends
to convert a majority of this amount into equity of ATI, thereby satisfying the
agreement to provide an additional $3.0 million in equity.
 
     Under agreements between ATI and Dana-Farber, ATI was the licensee of
Dana-Farber's apoptosis technology and ImmunoGen possessed the exclusive right
to license products developed by ATI, including those based on Dana-Farber's
apoptosis technology. These agreements were terminated as of January 1, 1996. A
portion of the Company's research and development expenses was incurred in
connection with an agreement between ATI and Dana-Farber, under which ATI had
agreed to fund certain research projects conducted at Dana-Farber. In fiscal
1994, 1995 and 1996, these expenses amounted to $530,000, $670,000 and $327,000,
respectively. The balance due Dana-Farber under this agreement of approximately
$350,000 was included in the June 28, 1996 debenture issued by the Company to
Dana-Farber as described in Note A. Under the terms of the termination
agreement, the Company satisfied all past and present obligations under the
license agreement and ATI retains any rights to technology developed prior to
January 1, 1996.
 
  Other
 
     Development revenues of approximately $75,000 and $398,000 in fiscal 1994
and 1996, respectively, represent income earned under the Small Business
Innovation Research Program of the National Institutes of Health and, in fiscal
1996, amounts received pursuant to licensing agreements of the Company and its
subsidiary, ATI.
 
                                       16
<PAGE>   17
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
F. PROPERTY AND EQUIPMENT:
 
     Property and equipment consisted of the following at June 30, 1995 and
1996:
 
<TABLE>
<CAPTION>
                                                                          JUNE 30,
                                                                  -------------------------
                                                                     1995          1996
                                                                  -----------   -----------
    <S>                                                           <C>           <C>
    Machinery and equipment.....................................  $ 6,760,500   $ 5,235,339
    Computer hardware and software..............................    1,063,883     1,054,586
    Furniture and fixtures......................................      136,722       133,964
    Leasehold improvements......................................   15,889,963     8,131,394
                                                                  -----------   -----------
                                                                   23,851,068    14,555,283
    Less accumulated depreciation and amortization..............   10,229,685    10,391,867
                                                                  -----------   -----------
                                                                  $13,621,383   $ 4,163,416
                                                                  ===========   ===========
</TABLE>
 
     Depreciation and amortization expense was $2,043,537, $3,284,583 and
$2,507,704 for the years ended June 30, 1994, 1995 and 1996, respectively.
 
     Maintenance and repair expense was approximately $229,000, $173,000 and
$120,000 for fiscal years 1994, 1995 and 1996, respectively.
 
     In connection with the Company's assignment of its equipment leases at its
Canton facility, as described in Note D, the Company wrote off approximately
$9.3 million of assets, with a corresponding reduction in accumulated
depreciation of approximately $2.3 million. This disposition of the Company's
Canton assets includes recognition of a net loss on its equipment lease at the
Canton facility of approximately $2.0 million for the year ended June 30, 1996.
 
     The Company's policy is to depreciate property and equipment over its
remaining useful life, generally three to five years, and to evaluate the
remaining life and recoverability of such property and equipment in light of
current conditions as discussed in Note A. Since there is substantial doubt
about the Company's ability to continue as a going concern, it is reasonably
possible that the Company's estimate that it will recover the carrying amount of
its property and equipment from future operations will change in the near term;
however, management believes the fair value of its property and equipment
exceeds its net book value at June 30, 1996.
 
G. INCOME TAXES:
 
     No income tax provision or benefit has been provided for U.S. federal
income tax purposes as the Company has incurred losses since inception. As of
June 30, 1996 net deferred tax assets totaled approximately $43.0 million,
consisting of federal net operating loss carryforwards of approximately $110.0
million and approximately $4.0 million of research and experimentation credit
carryforwards. These net operating loss and credit carryforwards will expire at
various dates between 1997 and 2011 and may be subject to limitation when used
due to certain changes in ownership of the Company's capital stock. Due to the
uncertainty surrounding the realization of these favorable tax attributes in
future tax returns, the net deferred tax assets of approximately $40.0 million
and $43.0 million at June 30, 1995 and 1996, respectively, have been fully
offset by a valuation allowance. Income tax expense consists primarily of state
income taxes levied on the interest income of the Company's wholly owned
subsidiary, ImmunoGen Securities Corp., at a rate of 1.32%.
 
                                       17
<PAGE>   18
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
H. CAPITAL STOCK:
 
  Common Stock
 
     In August 1995, the Company issued $3.6 million of 7% subordinated
convertible debentures to a small number of overseas investors. Net proceeds to
the Company amounted to approximately $3.3 million. As of June 30, 1996, all of
these debentures plus accrued interest thereon had been converted into shares of
the Company's Common Stock. In total, 2,753,269 shares were issued to the
holders of the $3.6 million 7% subordinated convertible debentures for both
principal and interest. In addition, 81,480 shares of the Company's Common Stock
were issued to a third party as a finder's fee in connection with the issuance
of the debentures. The value of the shares, approximately $108,000, was charged
to interest expense.
 
     In March 1996, the Company sold a $5.0 million 9% convertible debenture in
a private placement. Net proceeds to the Company amounted to approximately $4.75
million. As of June 30, 1996, a $2.5 million principal amount debenture plus
accrued interest thereon had been converted into 1,018,000 shares of the
Company's Common Stock based upon a predetermined formula discounted from the
market price of the Company's Common Stock. The remaining $2.5 million principal
amount debenture still outstanding at June 30, 1996, due in 2000, and any
accrued interest thereon can be converted into shares of the Company's Common
Stock at any time according to a predetermined formula providing for a discount
from the market price of the Common Stock.
 
     In June 1996 the Company satisfied its own and ATI's obligations to
Dana-Farber, totaling approximately $1.3 million, by issuing an 11.5%
convertible debenture in that amount. On July 12, 1996, the 11.5% debenture and
accrued interest thereon, aggregating $1,318,734, was converted into 351,662
shares of the Company's Common Stock.
 
  Stock Options
 
     Under the Company's Restated Stock Option Plan (the "Plan") originally
adopted by the Board of Directors on February 13, 1986, and subsequently amended
and restated, employees, consultants and directors may be granted options to
purchase up to 2,400,000 shares of Common Stock of the Company. Prior to June 7,
1994, 1,700,000 shares of Common Stock were reserved for the grant of options
under the Plan. On June 7, 1994, the Board of Directors authorized, and the
shareholders subsequently approved, an amendment to the Plan to increase the
number of shares reserved for the grant of options to 2,400,000 shares of Common
Stock.
 
                                       18
<PAGE>   19
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Information related to stock option activity under the Plan during fiscal
years 1994, 1995 and 1996 is as follows:
 
<TABLE>
<CAPTION>
                                                                                  OPTION
                                                                   SHARES          PRICE
                                                                  ---------     -----------
    <S>                                                           <C>           <C>
    Outstanding at June 30, 1993................................  1,248,620     $0.67-14.75
                                                                  ---------     -----------
    Granted.....................................................    582,200      4.50-10.50
    Exercised...................................................     41,438      0.90- 2.00
    Canceled....................................................    205,869      2.00-14.75
                                                                  ---------     -----------
    Outstanding at June 30, 1994................................  1,583,513      0.67-14.75
                                                                  ---------     -----------
    Granted.....................................................    338,300      1.94- 4.38
    Exercised...................................................     10,875      0.90- 2.00
    Canceled....................................................    623,572      0.90-14.75
                                                                  ---------     -----------
    Outstanding at June 30, 1995................................  1,287,366      0.67-14.75
                                                                  ---------     -----------
    Granted.....................................................    613,900      1.44- 5.00
    Exercised...................................................    108,500      0.67- 3.38
    Canceled....................................................    118,904      2.00-14.75
                                                                  ---------     -----------
    Outstanding at June 30, 1996................................  1,673,862     $0.90-14.75
                                                                  =========     ===========
</TABLE>
 
     In addition to options granted under the Plan, the Board previously has
approved the granting of other, non-qualified options. In July 1987 and February
1988, the Company granted non-qualified options for the purchase of 115,500 and
15,000 shares of Common Stock at exercise prices of $0.67 and $0.90 per share,
respectively. During 1994, 1995 and 1996, options for 2,000, 13,000 and 60,000
shares were exercised at a price of $0.67 per share. As of June 30, 1996,
options for 19,687 of these shares had been cancelled, 92,813 had been exercised
and 18,000 were outstanding and exercisable.
 
     The Company has granted options at the fair market value of the Common
Stock at the date of such grant. There were a total of 1,095,810 stock options
exercisable under the Company's stock option plans as of June 30, 1996.
 
     Options vest at various rates over periods up to four years and may be
exercised within ten years from the date of grant.
 
  Common Stock Reserved
 
     Shares of authorized Common Stock have been reserved for the exercise of
all options and warrants outstanding.
 
  Warrants
 
     In connection with a capital lease financing in March 1994, the Company
issued warrants to purchase 26,738 shares of Common Stock at an exercise price
of $7.48 per share expiring in April 1999. The value of these warrants,
approximating $77,000, was recognized as interest expense over the life of the
lease.
 
     In connection with the 9% $5.0 million principal amount debenture financing
in March 1996, the Company issued warrants to purchase 509,000 and 500,000
shares of Common stock at exercise prices of $4.00 and $6.00 per share,
respectively, expiring in 2001. The value of these warrants, approximating $2.2
million, was recognized as interest expense at the time of issuance.
 
     Of the original $5.0 million principal amount debentures, $2.5 million had
been converted into shares of the Company's Common Stock as of June 30, 1996. If
the remaining $2.5 million principal amount and
 
                                       19
<PAGE>   20
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
accrued interest are converted into shares of the Company's Common Stock, the
holder will receive warrants to purchase additional shares of the Company's
Common Stock equal to one-half the number issued upon conversion of the
debenture. These warrants will carry an exercise price of $4.00 per share and be
exercisable for a period of five years from date of issuance. Because issuance
of these warrants is based upon future events, no value has been ascribed to
this potential issuance of warrants at June 30, 1996. Also in connection with
the issuance of the 9% debentures, the Company issued warrants to purchase a
total of 250,000 shares of the Company's Common Stock to a third party as a
finder's fee. These warrants have an exercise price of $3.105, expire in 2003,
and their value, totaling approximately $461,000, was charged to interest
expense at the time of issuance of the warrants.
 
I. COMMITMENTS:
 
  Operating Leases
 
     At June 30, 1996, the Company is leasing facilities in Norwood and
Cambridge, Massachusetts. The lease term on the Norwood facilities expires in
June 1997 (with a three-year extension option). The Cambridge facilities are
rented under two separate lease arrangements, expiring in 1997 and 2003. The
latter of these facilities is subject to the sublease agreement discussed in
Note A, with a current sublease term expiring in February 1999. The Company is
required to pay all operating expenses for the leased premises subject to
escalation charges for certain expense increases over a base amount. Rent
expense for leased facilities and equipment was approximately $1,186,000,
$913,000 and $382,000 (net of sublease income of $500,000) during fiscal years
1994, 1995 and 1996, respectively.
 
     The minimum rental commitments, including real estate taxes, for the next
five years under the lease agreements are as follows:
 
<TABLE>
<CAPTION>
                     FISCAL YEAR                  COMMITMENTS     SUBLEASE INCOME        NET
        --------------------------------------    -----------     ---------------     ---------
        <S>                                       <C>             <C>                 <C>
        1997..................................     $ 921,230         $ 751,447        $ 169,783
        1998..................................       566,469           792,306         (225,837)
        1999..................................       524,804           561,298          (36,494)
        2000..................................       447,382                --          447,382
        2001..................................       447,382                --          447,382
</TABLE>
 
     In January 1996, the Company assigned the lease on its Canton facility to a
third party (see Note D).
 
  Capital Leases
 
     In fiscal year 1988, the Company, as part of one of its lease agreements,
arranged financing for $989,975 of improvements to one of its leased facilities
through the lessor. The lessor obtained a five-year promissory note with a bank
specifically to finance the improvements to the facility. The promissory note
was amortized over a ten-year period. At the end of the first five years, the
lessor refinanced the unamortized principal due the bank. Interest expense on
the new note is incurred at the rate of 7.50% per annum.
 
     In March 1994, the Company executed a sale/leaseback agreement to finance
approximately $4.0 million of equipment at its Canton facility. As of June 30,
1994, all funds available under this agreement had been received. In January
1996, all obligations under this lease agreement were assigned to another
biotechnology company, along with the Canton facility (see Note D).
 
                                       20
<PAGE>   21
 
                                IMMUNOGEN, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Assets recorded under capital leases as of June 30, 1995 and 1996 are
included in property and equipment as follows:
 
<TABLE>
<CAPTION>
                                                                           JUNE 30,
                                                                   ------------------------
                                                                      1995          1996
                                                                   ----------     ---------
    <S>                                                            <C>            <C>
    Machinery and equipment......................................  $1,590,510     $ 989,975
    Leasehold improvements.......................................   3,413,490            --
    Less accumulated depreciation................................   1,727,403       866,230
                                                                   ----------     ---------
    Net book value...............................................  $3,276,597     $ 123,745
                                                                   ==========     =========
</TABLE>
 
The future minimum lease payments are as follows:
 
<TABLE>
<CAPTION>
                                  FISCAL YEAR                                    AMOUNT
    ------------------------------------------------------------------------    ---------
    <S>                                                                         <C>
    1997....................................................................    $ 150,129
    1998....................................................................       37,532
                                                                                 --------
    Total future minimum lease payments.....................................      187,661
    Less amount representing interest.......................................        9,060
                                                                                 --------
    Present value of minimum lease payments.................................      178,601
    Less current portion....................................................      141,533
                                                                                ---------
    Noncurrent portion, minimum lease payments..............................    $  37,068
                                                                                =========
</TABLE>
 
J. EMPLOYEE BENEFIT PLANS:
 
     Effective September 1, 1990, the Company implemented a deferred
compensation plan under Section 401(k) of the Internal Revenue Code (the
"Plan"). Under the Plan, eligible employees are permitted to contribute, subject
to certain limitations, up to 15% of their gross salary. The Company makes a
matching contribution which currently totals 20% of the employee's contribution,
up to a maximum amount equal to 1% of the employee's gross salary. In fiscal
1994, 1995 and 1996, the Company's contributions to the Plan amounted to
$62,000, $51,000 and $31,000, respectively.
 
   
K. SUBSEQUENT EVENT
    
 
   
     In March 1997, the Securities and Exchange Commission issued a new
interpretation for the accounting for convertible preferred stock and
convertible debt instruments issued with provisions providing for conversion
into common stock at a discount from the market price of the common stock.
Accordingly, the Company has restated its financial statements for the year
ended June 30, 1996.
    
 
   
     The new interpretation provides that assured incremental yield embedded in
the conversion terms' discount from fair market value should be accounted for as
an additional interest expense in the case of convertible debt and as a dividend
to preferred shareholders in the case of convertible preferred stock.
    
 
   
     At June 30, 1996, compliance with this new ruling resulted in a non-cash
charge to interest expense of $2.4 million, and accounted for a $.17 per share
increase in the Company's loss per share.
    
 
                                       21
<PAGE>   22
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities and
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          IMMUNOGEN, INC.
 
   
                                 By: /s/       FRANK J. POCHER
                                     ------------------------------------------
                                     Frank J. Pocher
                                     Executive Vice President -- Operations and
                                     Chief Financial Officer

                                       Dated: April 7, 1997
    
 
                                       22

<PAGE>   1
 
                                                                      EXHIBIT 23
 
                                IMMUNOGEN, INC.
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
     We consent to the incorporation by reference in the registration statements
of ImmunoGen, Inc. on Form S-8 (File Nos. 33-41534 and 33-73544) and on Form S-3
(File Nos. 333-07661 and 333-15819) of our report, which includes any
explanatory paragraph concerning uncertainties surrounding the Company's ability
to continue as a going concern, dated August 28, 1996, except for Note K, as to
which the date is April 4, 1997 on our audits of the consolidated financial
statements of ImmunoGen, Inc. as of June 30, 1996 and 1995, and for each of the
three years in the period ended June 30, 1996, which report is included in this
Annual Report on Form 10-K/A.
    
 
   
<TABLE>
<S>                                             <C>
Boston, Massachusetts
 
April 7, 1997                                   COOPERS & LYBRAND L.L.P.
</TABLE>
    

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          JUN-30-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                       2,796,636
<SECURITIES>                                         0
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                             2,959,916
<PP&E>                                      14,555,284
<DEPRECIATION>                              10,391,868
<TOTAL-ASSETS>                               8,505,961
<CURRENT-LIABILITIES>                        1,941,067
<BONDS>                                              0
                                0
                                          0
<COMMON>                                   128,250,707
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                 8,505,961
<SALES>                                              0
<TOTAL-REVENUES>                               568,423
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                            13,393,026
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           3,718,218
<INCOME-PRETAX>                           (16,542,821)
<INCOME-TAX>                                     1,640
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (16,544,461)
<EPS-PRIMARY>                                   (1.15)
<EPS-DILUTED>                                   (1.15)
        

</TABLE>


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