ADAGE CAPITAL PARTNERS GP, L.L.C.

Position in BIIB — Biogen Inc.

CIK 1165408 Boston, MA

Position in BIIB

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$61,132,671

+$9,328,783 QoQ

Shares Held

333,457

+13.3% QoQ

Ownership

0.226%

of shares outstanding

% of Portfolio

0.10%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

24 quarters on record

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

Healthcare · as of Mar 31, 2026

ADAGE CAPITAL PARTNERS GP, L.L.C. holds $2,579,687,180 across 10 Drug Manufacturers - General names. BIIB ranks #8 (2.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LLY	ELI LILLY & Co	956,817	$880,051,572
2	JNJ	Johnson & Johnson	2,463,008	$602,057,675
3	MRK	Merck & Co., Inc.	2,687,439	$323,272,037
4	ABBV	AbbVie Inc.	1,470,271	$319,769,239
5	GILD	Gilead Sciences, Inc.	916,513	$127,734,416
6	AMGN	Amgen Inc	342,500	$120,508,625
7	BMY	Bristol Myers Squibb Co	1,466,671	$88,953,596
8	BIIB	Biogen Inc. This page	333,457	$61,132,671

24 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$61,132,671	333,457	+13.3%	Shares	Sole	2026-05-15
2025-12-31	$51,803,888	294,357	-11.4%	Shares	Sole	2026-02-17
2025-09-30	$46,525,050	332,132	+34.0%	Shares	Sole	2025-11-14
2025-06-30	$31,138,407	247,937	+250.4%	Shares	Sole	2025-08-14
2025-03-31	$9,683,756	70,767	+54.5%	Shares	Sole	2025-05-15
2024-09-30	$8,877,678	45,799	-66.7%	Shares	Sole	2024-11-14
2024-06-30	$31,921,382	137,699	-45.3%	Shares	Sole	2024-08-14
2024-03-31	$54,248,626	251,582	-29.3%	Shares	Sole	2024-05-15
2023-12-31	$92,072,436	355,808	+484.3%	Shares	Sole	2024-02-14
2023-09-30	$15,650,623	60,895	-84.9%	Shares	Sole	2023-11-14
2023-06-30	$114,525,651	402,056	+21.1%	Shares	Other	2023-08-14
2023-03-31	$92,312,354	332,023	+49.2%	Shares	Sole	2023-05-15
2022-12-31	$61,642,115	222,599	-10.2%	Shares	Sole	2023-02-14
2022-09-30	$66,162,333	247,799	+62.5%	Shares	Sole	2022-11-14
2022-06-30	$31,100,646	152,499	+728.8%	Shares	Sole	2022-08-15
2022-03-31	$3,874,829	18,399	-89.9%	Shares	Sole	2022-05-16
2021-12-31	$43,545,240	181,499	+60.5%	Shares	Sole	2022-02-14
2021-09-30	$32,005,886	113,099	-16.5%	Shares	Sole	2021-11-15
2021-06-30	$46,884,611	135,399	-21.3%	Shares	Sole	2021-08-16
2021-03-31	$48,113,363	171,987	+1.4%	Shares	Sole	2021-05-17
2020-12-31	$41,549,558	169,687	-4.1%	Shares	Sole	2021-02-16
2020-09-30	$50,177,318	176,880	+218.2%	Shares	Sole	2020-11-16
2020-06-30	$14,873,104	55,590	-73.0%	Shares	Sole	2020-08-14
2020-03-31	$65,139,478	205,890	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.