Historical shareholding details of Wellington Management Company LLP holdings in Immunogen, Inc. (IMGN)

Monthly changes of Wellington Management Company LLP 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	Wellington Management Company Llp	1,107,385	0.40%

Dec 31, 2023	Wellington Management Company Llp	7,797,105	2.91%

Nov 30, 2023	Wellington Management Company Llp	7,926,882	2.96%

Oct 31, 2023	Wellington Management Company Llp	7,966,400	3.20%

Sep 30, 2023	Wellington Management Company Llp	13,258,997	4.75%
Sep 30, 2023	Wellington Management Company Llp	4,137,575	1.66%

Aug 31, 2023	Wellington Management Company Llp	4,457,591	1.79%

Jul 31, 2023	Wellington Management Company Llp	4,480,286	1.80%

Jun 30, 2023	Wellington Management Company Llp	9,752,899	3.92%
Jun 30, 2023	Wellington Management Company Llp	2,304,789	0.90%

May 31, 2023	Wellington Management Company Llp	2,497,376	1.10%

Mar 31, 2023	Wellington Management Company Llp	9,864,785	3.96%

Dec 31, 2022	Wellington Management Company Llp	9,226,708	4.08%