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* Wingrove Theresa (Last) (First) (Middle) C/O IMMUNOGEN, INC. 830 WINTER STREET (Street) WALTHAM MA 02451 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 12/09/2016	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) VP of Regulatory Affairs	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)

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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	01/18/2012(1)	01/18/2021	Common Stock	37,500	9.85	D
Stock Option (right to buy)	07/22/2012(2)	07/22/2021	Common Stock	20,000	15.2	D
Stock Option (right to buy)	07/20/2013(3)	07/20/2022	Common Stock	40,000	15.83	D
Stock Option (right to buy)	07/16/2014(4)	07/16/2023	Common Stock	40,000	19.02	D
Stock Option (right to buy)	07/17/2015(5)	07/17/2024	Common Stock	40,000	10.79	D
Stock Option (right to buy)	07/13/2016(6)	07/13/2025	Common Stock	48,000	16.72	D
Stock Option (right to buy)	06/01/2017(7)	06/01/2026	Common Stock	4,000	5.75	D
Stock Option (right to buy)	07/18/2017(8)	07/18/2026	Common Stock	50,000	3.05	D
Stock Option (right to buy)	09/30/2017(9)	09/30/2026	Common Stock	38,000	2.68	D

Explanation of Responses:

1. All options exercisable as of filing date.

2. All options exercisable as of filing date.

3. All options exercisable as of filing date.

4. All options exercisable as of filing date.

5. 26,667 options exercisable as of filing date and 13,333 shares exercisable commencing on July 17, 2017.

6. 16,000 options exercisable as of filing date, 16,000 shares exercisable commencing on July 13, 2017, and 16,000 shares exercisable commencing on July 13, 2018.

7. Exercisable as to 1,334 shares commencing on June 1, 2017, 1,333 shares commencing on June 1, 2018, and 1,333 shares commencing on June 1, 2019.

8. Exercisable as to 16,667 shares commencing on July 18, 2017, 16,667 shares commencing on July 18, 2018, and 16,666 shares commencing on July 18, 2019.

9. Exercisable as to 12,667 shares commencing on September 30, 2017, 12,667 shares commencing on September 30, 2018, and 12,666 shares commencing on September 30, 2019.

	/s/ Craig Barrows, attorney in fact	12/16/2016
	** 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).
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