Alyeska Investment Group, L.P.

Position in BIIB — Biogen Inc.

CIK 1453072 CHICAGO, IL

Position in BIIB

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$201,448,726

+$53,858,910 QoQ

Shares Held

932,374

+15.8% QoQ

Ownership

0.632%

of shares outstanding

% of Portfolio

0.58%

of 13F equity value

Holder Rank

#25

of 1,031 holders

Holding Since

Jun 2021

12 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Alyeska Investment Group, L.P. holds $909,020,667 across 5 Drug Manufacturers - General names. BIIB ranks #3 (22.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	MRK	Merck & Co., Inc.	2,480,590	$318,755,815
2	JNJ	Johnson & Johnson	1,173,482	$298,029,223
3	BIIB	Biogen Inc. This page	932,374	$201,448,726
4	SNY	Sanofi	2,112,012	$90,098,431
5	LLY	ELI LILLY & Co	574	$688,472

12 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$201,448,726	932,374	+15.8%	Shares	Sole	2026-08-14
2026-03-31	$147,589,816	805,050	-21.4%	Shares	Sole	2026-05-15
2025-12-31	$180,260,925	1,024,268	+21.2%	Shares	Sole	2026-02-13
2025-09-30	$118,406,402	845,277	+66.1%	Shares	Sole	2025-11-17
2025-06-30	$63,896,801	508,773	+26.9%	Shares	Sole	2025-08-14
2024-06-30	$92,960,979	401,005	+140.6%	Shares	Sole	2024-08-14
2024-03-31	$35,944,011	166,693	-60.6%	Shares	Sole	2024-05-15
2023-12-31	$109,376,903	422,680	-4.4%	Shares	Sole	2024-02-14
2023-09-30	$113,617,952	442,076	+20.4%	Shares	Sole	2023-11-14
2023-06-30	$104,616,289	367,268	+1365.3%	Shares	Sole	2023-08-14
2022-12-31	$6,940,722	25,064	-61.7%	Shares	Sole	2023-02-14
2021-06-30	$22,634,631	65,367	—	Shares	Sole	2021-08-16
No filing history on record for this holder in this stock.