ACADIAN ASSET MANAGEMENT LLC

Position in BIIB — Biogen Inc.

CIK 916542 Boston, MA

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Position in BIIB

as of Mar 31, 2026 · filed May 13, 2026 Compact

Position Value

$45,555,488

+$12,564,931 QoQ

Shares Held

248,489

+32.6% QoQ

Ownership

0.168%

of shares outstanding

% of Portfolio

0.07%

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

ACADIAN ASSET MANAGEMENT LLC holds $4,100,855,961 across 15 Drug Manufacturers - General names. BIIB ranks #9 (1.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BMY	Bristol Myers Squibb Co	11,887,668	$720,987,064
2	GSK	GSK plc	11,797,085	$651,081,121
3	MRK	Merck & Co., Inc.	4,202,381	$505,504,410
4	LLY	ELI LILLY & Co	534,020	$491,175,575
5	JNJ	Johnson & Johnson	1,905,647	$465,816,352
6	AZN	Astrazeneca PLC	2,330,171	$459,556,324
7	ABBV	AbbVie Inc.	2,095,605	$455,773,131
8	PFE	Pfizer Inc	8,401,716	$235,920,185

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	$45,555,488	248,489	+32.6%	Shares	Defined	2026-05-13
2025-12-31	$32,990,557	187,457	-4.0%	Shares	Defined	2026-02-10
2025-09-30	$27,350,760	195,251	-2.1%	Shares	Defined	2025-11-13
2025-06-30	$25,050,432	199,462	+1036.1%	Shares	Defined	2025-08-07
2025-03-31	$2,402,499	17,557	+448.7%	Shares	Defined	2025-05-21
2024-12-31	$489,344	3,200	+30.2%	Shares	Defined	2025-02-11
2024-09-30	$476,458	2,458	-56.9%	Shares	Defined	2024-11-12
2024-06-30	$1,321,837	5,702	+201.9%	Shares	Defined	2024-08-06
2024-03-31	$407,325	1,889	-2.0%	Shares	Defined	2024-05-10
2023-12-31	$498,649	1,927	-85.5%	Shares	Defined	2024-02-13
2023-09-30	$3,424,658	13,325	-71.1%	Shares	Defined	2023-11-13
2023-06-30	$13,114,494	46,040	+0.8%	Shares	Defined	2023-08-07
2023-03-31	$12,694,571	45,659	-23.4%	Shares	Defined	2023-05-11
2022-12-31	$16,510,247	59,621	-35.2%	Shares	Defined	2023-02-14
2022-09-30	$24,551,451	91,953	+22.5%	Shares	Defined	2022-11-14
2022-06-30	$15,310,795	75,075	-34.5%	Shares	Defined	2022-08-09
2022-03-31	$24,122,124	114,540	+312.1%	Shares	Defined	2022-05-12
2021-12-31	$6,668,336	27,794	-60.9%	Shares	Defined	2022-02-10
2021-09-30	$20,141,813	71,175	-60.3%	Shares	Defined	2021-11-12
2021-06-30	$62,058,855	179,221	-48.9%	Shares	Defined	2021-08-11
2021-03-31	$98,117,277	350,732	-30.3%	Shares	Defined	2021-05-11
2020-12-31	$123,213,552	503,200	-4.0%	Shares	Defined	2021-02-11
2020-09-30	$148,737,395	524,314	+36.4%	Shares	Defined	2020-11-09
2020-06-30	$102,820,000	384,302	+355.6%	Shares	Defined	2020-08-12
2020-03-31	$26,687,285	84,352	—	Shares	Defined	2020-05-11
No filing history on record for this holder in this stock.