Anna Berkenblit - 03 Feb 2023 Form 4 Insider Report for ImmunoGen, Inc. (IMGN)

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

Type	Sym	Class	Transaction	Value $	Shares	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	IMGN	Restricted Stock Unit	Award	$0	+42,700	$0.000000	42,700	03 Feb 2023	Common Stock	42,700	$0.000000	Direct	F1, F2
transaction	IMGN	Stock Option (right to buy)	Award	$0	+256,300	$0.000000	256,300	03 Feb 2023	Common Stock	256,300	$4.66	Direct	F3
transaction	IMGN	Restricted Stock Unit	Award	$0	+63,400	$0.000000	63,400	03 Feb 2023	Common Stock	63,400	$0.000000	Direct	F1, F4

* 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.
F4	The RSUs shall vest with respect to 40% of such RSUs on the one-year anniversary of the date of grant and with respect to the remaining 60% of such RSUs on the eighteen-month anniversary of the date of grant, subject to continued service through each vesting date.