ImmunoGen, Inc.

BLAIR WILLIAM & CO/IL

Report date

12/31/2023

Quarter

2023 Q4

Filed

2/12/2024

Shares

130,723

Value ($000)

3,876

Weight

0.0%

2013 Q4 - 2023 Q4 (20 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	3,876	0.0%	130,723	12/31/2023
2023 Q3	11/9/2023	4,036	0.0%	254,320	9/30/2023
2023 Q2	8/11/2023	4,831	0.0%	256,005	6/30/2023
2023 Q1	5/12/2023	2,226	0.0%	579,595	3/31/2023
2022 Q4	2/10/2023	1,709	0.0%	344,595	12/31/2022
2022 Q3	11/9/2022	1,276	0.0%	266,845	9/30/2022
2022 Q2	8/10/2022	1,199	0.0%	266,445	6/30/2022
2022 Q1	5/13/2022	2,563	0.0%	538,410	3/31/2022
2021 Q4	2/14/2022	3,973	0.0%	535,485	12/31/2021
2021 Q3	11/12/2021	2,923	0.0%	515,600	9/30/2021
2021 Q2	8/12/2021	3,393	0.0%	514,909	6/30/2021
2021 Q1	5/13/2021	4,178	0.0%	515,800	3/31/2021
2020 Q4	2/9/2021	1,357	0.0%	210,400	12/31/2020
2020 Q3	11/6/2020	610	0.0%	169,370	9/30/2020
2020 Q2	8/12/2020	774	0.0%	168,270	6/30/2020
2020 Q1	5/11/2020	566	0.0%	165,858	3/31/2020
2019 Q4	2/13/2020	907	0.0%	177,656	12/31/2019
2014 Q2	8/1/2014	255	0.0%	21,584	6/30/2014
2014 Q1	5/6/2014	330	0.0%	22,146	3/31/2014
2013 Q4	2/11/2014	354	0.0%	24,146	12/31/2013