CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM

Pension

Position in BIIB — Biogen Inc.

CIK 1081019 WEST SACRAMENTO, CA

Back to BIIB Full portfolio

Position in BIIB

as of Mar 31, 2026 · filed May 18, 2026 Compact

Position Value

$40,458,547

+$617,931 QoQ

Shares Held

220,687

-2.5% QoQ

Ownership

0.149%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in BIIB Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - General

Healthcare · as of Mar 31, 2026

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM holds $4,130,100,665 across 10 Drug Manufacturers - General names. BIIB ranks #9 (1.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LLY	ELI LILLY & Co	1,214,622	$1,117,172,876
2	JNJ	Johnson & Johnson	3,743,432	$915,044,518
3	ABBV	AbbVie Inc.	2,680,188	$582,914,088
4	MRK	Merck & Co., Inc.	3,835,612	$461,385,767
5	AMGN	Amgen Inc	825,116	$290,317,064
6	GILD	Gilead Sciences, Inc.	1,914,292	$266,794,876
7	PFE	Pfizer Inc	9,005,182	$252,865,510
8	BMY	Bristol Myers Squibb Co	3,317,201	$201,188,240

All Filings in BIIB

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$40,458,547	220,687	-2.5%	Shares	Sole	2026-05-18
2025-12-31	$39,840,616	226,380	-3.6%	Shares	Sole	2026-02-17
2025-09-30	$32,893,305	234,818	-1.6%	Shares	Sole	2025-11-14
2025-06-30	$29,977,202	238,691	+3.5%	Shares	Sole	2025-08-14
2025-03-31	$31,546,409	230,535	-1.2%	Shares	Sole	2025-05-15
2024-12-31	$35,678,988	233,318	+1.2%	Shares	Sole	2025-03-18
2024-09-30	$44,681,476	230,507	-0.2%	Shares	Sole	2025-04-04
2024-06-30	$53,535,351	230,935	+1.7%	Shares	Sole	2025-04-08
2024-03-31	$48,963,535	227,072	+0.3%	Shares	Sole	2024-05-16
2023-12-31	$58,591,220	226,422	+0.0%	Shares	Sole	2024-02-13
2023-09-30	$58,169,844	226,333	-3.1%	Shares	Sole	2023-11-14
2023-06-30	$66,527,572	233,553	-5.7%	Shares	Sole	2023-08-21
2023-03-31	$68,891,385	247,784	-1.5%	Shares	Sole	2023-05-09
2022-12-31	$69,651,472	251,522	+0.6%	Shares	Sole	2023-02-14
2022-09-30	$66,786,846	250,138	-0.8%	Shares	Sole	2022-11-21
2022-06-30	$51,405,524	252,062	-1.8%	Shares	Sole	2022-08-15
2022-03-31	$54,070,075	256,743	-6.2%	Shares	Sole	2022-05-16
2021-12-31	$65,700,892	273,845	+2.8%	Shares	Sole	2022-02-15
2021-09-30	$75,382,593	266,379	+0.8%	Shares	Sole	2021-11-15
2021-06-30	$91,499,077	264,242	-10.4%	Shares	Sole	2021-08-16
2021-03-31	$82,531,005	295,017	-0.5%	Shares	Sole	2021-05-18
2020-12-31	$72,602,459	296,506	-11.7%	Shares	Sole	2021-02-16
2020-09-30	$95,271,942	335,843	-5.7%	Shares	Sole	2020-11-17
2020-06-30	$95,330,472	356,309	-5.2%	Shares	Sole	2020-08-17
2020-03-31	$118,894,022	375,795	—	Shares	Sole	2020-05-13
No filing history on record for this holder in this stock.