Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  BARROWS CRAIG
 2. Date of Event Requiring Statement (Month/Day/Year)
11/16/2010		 3. Issuer Name and Ticker or Trading Symbol
IMMUNOGEN INC [IMGN]
(Last)
(First)
(Middle)
22 CHESNUT STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Vice-President,General Counsel
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SALEM, MA 01970		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common stock, $.01 par value 6,100
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock option (right to buy) 10/03/2008(1) 10/03/2017 Common stock 50,000 $ 4.5 D  
Stock option (right to buy) 06/11/2009(2) 06/11/2018 Common stock 15,000 $ 3.3 D  
Stock option (right to buy) 07/24/2010(3) 07/24/2019 Common stock 55,000 $ 9.88 D  
Stock option (right to buy) 07/23/2011(4) 07/23/2020 Common stock 40,000 $ 9.14 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
BARROWS CRAIG
22 CHESNUT STREET
SALEM, MA 01970		       Vice-President,General Counsel  

Signatures

Craig Barrows 11/17/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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 12500 shares commencing on 10/3/2008, 12500 shares commencing on 10/3/2009, 12500 shares commencing on 10/3/2010 and 12500 shares commencing on 10/3/2011
(2) Exercisable as to 5000 shares commencing on 6/11/2009, 5000 shares commencing on 6/11/2010 and 5000 shares commencing on 6/11/2011
(3) Exercisable as to 18333 shares commencing on 7/24/2010, 18334 shares commencing on 7/24/2011 and 18333 shares commencing on 7/24/2012
(4) Exercisable as to 13333 shares commencing on 7/23/2011, 13334 shares commencing on 7/23/2012 and 13333 shares commencing on 7/23/2013

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