DEAN J. MITCHELL - 03 Sep 2021 Form 4 Insider Report for ImmunoGen, Inc.

Role: Director
Signature: /s/ Joseph J. Kenny, attorney in fact
Issuer symbol: N/A
Transactions as of: 03 Sep 2021
Net transactions value: $0
Form type: 4
Filing time: 03 Sep 2021, 16:06:44 UTC
Previous filing: 02 Jul 2021
Next filing: 01 Oct 2021
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IMGN	Common Stock	Options Exercise	$9,200	+5,000	+50%	$1.84^*	15,000	03 Sep 2021	Direct
transaction	IMGN	Common Stock	Options Exercise	$46,400	+10,000	+67%	$4.64	25,000	03 Sep 2021	Direct
transaction	IMGN	Common Stock	Options Exercise	$37,800	+18,000	+72%	$2.10^*	43,000	03 Sep 2021	Direct
transaction	IMGN	Common Stock	Options Exercise	$228,000	+50,000	+116%	$4.56	93,000	03 Sep 2021	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	IMGN	Stock Option (right to buy)	Options Exercise	$9,200	-5,000	-100%	$1.84^*	0	03 Sep 2021	Common Stock	5,000	$1.84	Direct	F1
transaction	IMGN	Stock Option (right to buy)	Options Exercise	$46,400	-10,000	-100%	$4.64	0	03 Sep 2021	Common Stock	10,000	$4.64	Direct	F2
transaction	IMGN	Stock Option (right to buy)	Options Exercise	$37,800	-18,000	-100%	$2.10^*	0	03 Sep 2021	Common Stock	18,000	$2.10	Direct	F3
transaction	IMGN	Stock Option (right to buy)	Options Exercise	$228,000	-50,000	-100%	$4.56	0	03 Sep 2021	Common Stock	50,000	$4.56	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Exercisable as to 2,500 shares on each of 3/1/17 and 6/1/17, contingent upon the individual remaining a director as of each vesting date.
F2	Exercisable as to 2,500 shares on each of 9/1/17, 12/1/17, 3/1/18, and 6/1/18, contingent upon the individual remaining a director as of each vesting date.
F3	Exercisable as to 4,500 shares on each of 9/1/19, 12/1/19, 3/1/20, and 6/1/20, contingent upon the individual remaining a director as of each vesting date.
F4	Exercisable as to 12,500 shares on each of 9/1/20, 12/1/20, 3/1/21, and 6/1/21, contingent upon the individual remaining a director as of each vesting date.