Historical shareholding details of Artisan Partners Limited Partnership holdings in Immunogen, Inc. (IMGN)

Monthly changes of Artisan Partners Limited Partnership shareholding in Immunogen, Inc. over the previous months

Month	Name	Total no. shares held	Percent Holding
Month	Name	Total no. shares held	Percent Holding
Jan 31, 2024	Artisan Partners Limited Partnership	754,169	0.27%

Dec 31, 2023	Artisan Partners Limited Partnership	2,349,971	0.88%

Nov 30, 2023	Artisan Partners Limited Partnership	2,349,971	0.88%

Oct 31, 2023	Artisan Partners Limited Partnership	2,349,971	0.94%

Sep 30, 2023	Artisan Partners Limited Partnership	3,724,583	1.33%
Sep 30, 2023	Artisan Partners Limited Partnership	2,349,971	0.94%

Aug 31, 2023	Artisan Partners Limited Partnership	2,349,971	0.94%

Jul 31, 2023	Artisan Partners Limited Partnership	2,349,971	0.94%

Jun 30, 2023	Artisan Partners Limited Partnership	3,725,921	1.50%
Jun 30, 2023	Artisan Partners Limited Partnership	2,022,113	0.79%

May 31, 2023	Artisan Partners Limited Partnership	2,022,113	0.89%

Mar 31, 2023	Artisan Partners Limited Partnership	3,181,379	1.28%