Renee Lentini - 03 Feb 2023 Form 4 Insider Report for ImmunoGen, Inc.

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	Restricted Stock Unit	Award	$0	+25,305		$0.000000	25,305	03 Feb 2023	Common Stock	25,305	$0.000000	Direct	F1, F2
transaction	IMGN	Stock Option (right to buy)	Award	$0	+50,610		$0.000000	50,610	03 Feb 2023	Common Stock	50,610	$4.66	Direct	F3

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

Id	Content
F1	Each restricted stock unit ("RSU") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.
F2	The RSUs vest over a three-year period, with 33 1/3% of the RSUs vesting on each of the first three anniversaries of the date of grant, subject to continued service through each vesting date.
F3	These options vest over a four-year period, with 25% of the shares vesting on the one-year anniversary of the date of grant, and thereafter an additional 6.25% of the shares vesting on each succeeding quarterly anniversary of the date of grant.