CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

CIK

0001081019

City

WEST SACRAMENTO

State / Country

Stock

MTRN — MATERION Corp

Holdings in MTRN

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2025-12-31	$2,447,363	19,686	+2.7%	Shares	Sole	2026-02-17
2025-09-30	$2,315,806	19,169	+7.2%	Shares	Sole	2025-11-14
2025-06-30	$1,419,214	17,881	-5.4%	Shares	Sole	2025-08-14
2025-03-31	$1,543,137	18,911	-2.5%	Shares	Sole	2025-05-15
2024-12-31	$1,917,480	19,392	-1.1%	Shares	Sole	2025-03-18
2024-09-30	$2,192,567	19,601	-2.7%	Shares	Sole	2025-04-04
2024-06-30	$2,177,846	20,141	-2.6%	Shares	Sole	2025-04-08
2024-03-31	$2,725,248	20,685	-5.0%	Shares	Sole	2024-05-16
2023-12-31	$2,832,409	21,766	-4.4%	Shares	Sole	2024-02-13
2023-09-30	$2,319,267	22,758	-8.9%	Shares	Sole	2023-11-14
2023-06-30	$2,851,574	24,970	-2.6%	Shares	Sole	2023-08-21
2023-03-31	$2,973,312	25,632	-1.5%	Shares	Sole	2023-05-09
2022-12-31	$2,276,222	26,011	+1.2%	Shares	Sole	2023-02-14
2022-09-30	$2,057,120	25,714	-1.7%	Shares	Sole	2022-11-21
2022-06-30	$1,928,924	26,162	+0.2%	Shares	Sole	2022-08-15
2022-03-31	$2,238,328	26,106	-8.1%	Shares	Sole	2022-05-16
2021-12-31	$2,611,555	28,405	+2.0%	Shares	Sole	2022-02-15
2021-09-30	$1,911,006	27,841	-0.9%	Shares	Sole	2021-11-15
2021-06-30	$2,116,581	28,090	-8.2%	Shares	Sole	2021-08-16
2021-03-31	$2,027,738	30,612	-0.1%	Shares	Sole	2021-05-18
2020-12-31	$1,953,272	30,654	0.0%	Shares	Sole	2021-02-16
2020-09-30	$1,594,927	30,654	+0.1%	Shares	Sole	2020-11-17
2020-06-30	$1,882,147	30,609	-0.2%	Shares	Sole	2020-08-17
2020-03-31	$1,073,476	30,662	—	Shares	Sole	2020-05-13