Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SAYARE MITCHEL
   2. Issuer Name and Ticker or Trading Symbol
IMMUNOGEN INC [IMGN] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Executive Officer
(Last)
(First)
(Middle)
C/O IMMUNOGEN, INC., 128 SIDNEY STREET		 3. Date of Earliest Transaction (Month/Day/Year)
11/27/2007
(Street)

CAMBRIDGE, MA 02139		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 11/27/2007   M   11,500 A $ 0.844 537,778 D  
Common Stock 11/27/2007   S   1,700 D $ 4.84 536,078 D  
Common Stock 11/27/2007   S   1,300 D $ 4.82 534,778 D  
Common Stock 11/27/2007   S   1,100 D $ 4.81 533,678 D  
Common Stock 11/27/2007   S   1,261 D $ 4.8 532,417 D  
Common Stock 11/27/2007   S   2,039 D $ 4.83 530,378 D  
Common Stock 11/27/2007   S   800 D $ 4.79 529,578 D  
Common Stock 11/27/2007   S   300 D $ 4.78 529,278 D  
Common Stock 11/27/2007   S   1,800 D $ 4.86 527,478 D  
Common Stock 11/27/2007   S   300 D $ 4.85 527,178 D  
Common Stock 11/27/2007   S   200 D $ 4.88 526,978 D  
Common Stock 11/27/2007   S   400 D $ 4.87 526,578 D  
Common Stock 11/27/2007   S   300 D $ 4.89 526,278 D  
Common Stock 11/28/2007   M   29,300 A $ 0.844 555,578 D  
Common Stock 11/28/2007   S   2,000 D $ 4.845 553,578 D  
Common Stock 11/28/2007   S   800 D $ 4.92 552,778 D  
Common Stock 11/28/2007   S   244 D $ 4.88 552,534 D  
Common Stock 11/28/2007   S   100 D $ 4.79 552,434 D  
Common Stock 11/28/2007   S   128 D $ 4.77 552,306 D  
Common Stock 11/28/2007   S   372 D $ 4.78 551,934 D  
Common Stock 11/28/2007   S   4,051 D $ 4.8 547,883 D  
Common Stock 11/28/2007   S   200 D $ 4.87 547,683 D  
Common Stock 11/28/2007   S   1,100 D $ 4.81 546,583 D  
Common Stock 11/28/2007   S   609 D $ 4.86 545,974 D  
Common Stock 11/28/2007   S   3,907 D $ 4.84 542,067 D  
Common Stock 11/28/2007   S   121 D $ 4.9 541,946 D  
Common Stock 11/28/2007   S   3,786 D $ 4.85 538,160 D  
Common Stock 11/28/2007   S   9,682 D $ 4.83 528,478 D  
Common Stock 11/28/2007   S   2,200 D $ 4.82 526,278 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-qualified stock option (right to buy) $ 0.844 11/27/2007   M     11,500 12/31/1998(1) 12/31/2007 Common Stock 11,500 $ 0 (2) 217,666 D  
Non-qualified stock option (right to buy) $ 0.844 11/28/2007   M     29,300 12/31/1998(1) 12/31/2007 Common Stock 29,300 $ 0 (2) 188,366 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SAYARE MITCHEL
C/O IMMUNOGEN, INC.
128 SIDNEY STREET
CAMBRIDGE, MA 02139		   X     Chief Executive Officer  

Signatures

 /s/ Daniel M. Junius, attorney in fact   11/29/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Exercisable as to 76,389 shares commencing on December 31, 1998, 76,389 shares commencing on December 31, 1999, and 76,388 shares commencing on December 31, 2000.
(2) Field N/A to this transaction but was completed to allow for electronic filing only.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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