ImmunoGen, Inc.

PRIMECAP MANAGEMENT CO/CA/

Report date

12/31/2023

Quarter

2023 Q4

Filed

2/9/2024

Shares

273,100

Value ($000)

8,097

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	2/9/2024	8,097	0.0%	273,100	12/31/2023
2023 Q3	11/13/2023	4,334	0.0%	273,100	9/30/2023
2023 Q2	8/11/2023	5,153	0.0%	273,100	6/30/2023
2023 Q1	5/15/2023	1,087	0.0%	283,100	3/31/2023
2022 Q4	2/13/2023	3,473	0.0%	700,227	12/31/2022
2022 Q3	11/14/2022	3,481	0.0%	728,327	9/30/2022
2022 Q2	8/11/2022	3,277	0.0%	728,327	6/30/2022
2022 Q1	5/11/2022	3,602	0.0%	756,827	3/31/2022
2021 Q4	2/11/2022	5,652	0.0%	761,727	12/31/2021
2021 Q3	11/12/2021	4,473	0.0%	788,927	9/30/2021
2021 Q2	8/10/2021	5,297	0.0%	803,827	6/30/2021
2021 Q1	5/14/2021	6,854	0.0%	846,127	3/31/2021
2020 Q4	2/8/2021	5,810	0.0%	900,827	12/31/2020
2020 Q3	11/13/2020	3,243	0.0%	900,827	9/30/2020
2020 Q2	8/13/2020	4,338	0.0%	943,127	6/30/2020
2020 Q1	5/14/2020	3,404	0.0%	998,127	3/31/2020
2019 Q4	2/14/2020	18,761	0.0%	3,674,927	12/31/2019
2014 Q1	5/14/2014	189,244	0.2%	12,675,427	3/31/2014
2013 Q4	2/13/2014	185,949	0.2%	12,675,427	12/31/2013