ImmunoGen, Inc.

WELLINGTON MANAGEMENT GROUP LLP

Report date

12/31/2023

Quarter

2023 Q4

Filed

2/12/2024

Shares

1,954,413

Value ($000)

57,948

Weight

0.0%

2013 Q4 - 2023 Q4 (19 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2023 Q4	2/12/2024	57,948	0.0%	1,954,413	12/31/2023
2023 Q3	11/14/2023	210,420	0.0%	13,258,997	9/30/2023
2023 Q2	8/14/2023	184,037	0.0%	9,752,899	6/30/2023
2023 Q1	5/12/2023	37,881	0.0%	9,864,785	3/31/2023
2022 Q4	2/13/2023	45,764	0.0%	9,226,708	12/31/2022
2022 Q3	11/14/2022	47,835	0.0%	10,007,505	9/30/2022
2022 Q2	8/15/2022	48,227	0.0%	10,717,085	6/30/2022
2022 Q1	5/16/2022	62,182	0.0%	13,063,484	3/31/2022
2021 Q4	2/11/2022	103,157	0.0%	13,902,498	12/31/2021
2021 Q3	11/15/2021	79,765	0.0%	14,068,108	9/30/2021
2021 Q2	8/16/2021	96,166	0.0%	14,592,570	6/30/2021
2021 Q1	5/17/2021	153,928	0.0%	19,003,480	3/31/2021
2020 Q4	2/12/2021	142,442	0.0%	22,084,103	12/31/2020
2020 Q3	11/16/2020	83,089	0.0%	23,080,128	9/30/2020
2020 Q2	8/14/2020	107,233	0.0%	23,311,638	6/30/2020
2020 Q1	5/14/2020	65,305	0.0%	19,151,382	3/31/2020
2019 Q4	2/11/2020	213	0.0%	41,707	12/31/2019
2014 Q1	5/15/2014	46,679	0.0%	3,126,551	3/31/2014
2013 Q4	2/14/2014	46,661	0.0%	3,180,697	12/31/2013