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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
855654	Immunogen Inc.	IMGN	Pharmaceutical Preparations (2834)	042726691

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1177854	G David Foster	22 Hillside Dr. Townsend MA 01469	V.p.-Fin., Prin. Acctg. Off.	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2020-12-31	27,240	$0.00	48,964	No	4	M	Direct
Common Stock	Disposition	2020-12-31	11,052	$6.38	37,912	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Share Unit	Disposition	2020-12-31	27,240	$0.00	27,240	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	M	Direct

Footnotes

Each restricted stock unit ("RSU") represents the contingent right to receive, upon vesting of the RSU, one share of the Issuer's common stock.
On April 1, 2019, the reporting person was granted 45,400 restricted share units, vesting 40% on April 1, 2020 and 60% on December 31, 2020, subject to continued service through each such vesting date.
Restricted stock units convert into common stock on a one-for-one basis
The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.27 to $6.50, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within these ranges.
Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of the RSU's listed in Table II per a 10b5-1 plan.