ImmunoGen, Inc.

RA CAPITAL MANAGEMENT, L.P.

Report date

12/31/2023

Quarter

2023 Q4

Filed

2/14/2024

Shares

23,750,601

Value ($000)

704,205

Weight

11.0%

2020 Q1 - 2023 Q4 (15 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	2/14/2024	704,205	11%	23,750,601	12/31/2023
2023 Q3	11/14/2023	211,425	4.2%	13,322,288	9/30/2023
2023 Q2	8/14/2023	43,966	0.8%	2,329,958	6/30/2023
2023 Q1	5/15/2023	83,919	1.9%	21,853,958	3/31/2023
2022 Q4	2/14/2023	108,396	2.2%	21,853,958	12/31/2022
2022 Q3	11/14/2022	103,924	2.2%	21,741,458	9/30/2022
2022 Q2	8/15/2022	97,837	2.6%	21,741,458	6/30/2022
2022 Q1	5/16/2022	103,489	2.3%	21,741,458	3/31/2022
2021 Q4	2/14/2022	150,192	2.6%	20,241,458	12/31/2021
2021 Q3	11/15/2021	104,427	1.4%	18,417,458	9/30/2021
2021 Q2	8/16/2021	121,371	1.9%	18,417,458	6/30/2021
2021 Q1	5/17/2021	149,181	2.2%	18,417,458	3/31/2021
2020 Q4	2/16/2021	118,793	1.7%	18,417,458	12/31/2020
2020 Q3	11/16/2020	25,346	0.5%	7,040,485	9/30/2020
2020 Q1	5/15/2020	17,617	0.6%	5,166,303	3/31/2020