SEC FORM 3

SEC Form 3

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
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

BARROWS CRAIG

(Last)

(First)

(Middle)

22 CHESNUT STREET

(Street)

SALEM

01970

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
11/16/2010

3. Issuer Name and Ticker or Trading Symbol
IMMUNOGEN INC [ IMGN ]

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 of 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

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

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: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
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

Explanation of Responses:

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

	Craig Barrows	11/17/2010
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.