ImmunoGen, Inc.

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

Report date

12/31/2023

Quarter

2023 Q4

Filed

2/13/2024

Shares

250,499

Value ($000)

7,427

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	2/13/2024	7,427	0.0%	250,499	12/31/2023
2023 Q3	11/14/2023	3,910	0.0%	246,379	9/30/2023
2023 Q2	8/21/2023	5,155	0.0%	273,184	6/30/2023
2023 Q1	5/9/2023	977	0.0%	254,360	3/31/2023
2022 Q4	2/14/2023	1,282	0.0%	258,567	12/31/2022
2022 Q3	11/21/2022	1,222	0.0%	255,574	9/30/2022
2022 Q2	8/15/2022	1,174	0.0%	260,904	6/30/2022
2022 Q1	5/16/2022	1,259	0.0%	264,587	3/31/2022
2021 Q4	2/15/2022	2,062	0.0%	277,833	12/31/2021
2021 Q3	11/15/2021	1,525	0.0%	268,915	9/30/2021
2021 Q2	8/16/2021	1,775	0.0%	269,361	6/30/2021
2021 Q1	5/18/2021	2,344	0.0%	289,325	3/31/2021
2020 Q4	2/16/2021	1,802	0.0%	279,411	12/31/2020
2020 Q3	11/17/2020	934	0.0%	259,545	9/30/2020
2020 Q2	8/17/2020	1,181	0.0%	256,811	6/30/2020
2020 Q1	5/13/2020	876	0.0%	256,811	3/31/2020
2019 Q4	2/14/2020	1,131	0.0%	221,520	12/31/2019
2014 Q1	5/8/2014	2,294	0.0%	153,636	3/31/2014
2013 Q4	2/10/2014	2,245	0.0%	153,036	12/31/2013