Hudson Bay Capital Management LP

Position in BIIB — Biogen Inc.

CIK 1393825 STAMFORD, CT

Position in BIIB

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

Position Value

$19,445,400

-$17,471,212 QoQ

Shares Held

90,000

-55.3% QoQ

Ownership

0.061%

of shares outstanding

% of Portfolio

0.10%

of 13F equity value

Holder Rank

#123

of 1,038 holders

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Hudson Bay Capital Management LP holds $396,101,149 across 12 Drug Manufacturers - General names. BIIB ranks #5 (4.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LLY	ELI LILLY & Co	100,000	$119,943,010
2	AMGN	Amgen Inc	281,000	$101,755,720
3	ABBV	AbbVie Inc.	402,440	$101,270,001
4	NVO	Novo Nordisk A S	730,000	$34,996,200
5	BIIB	Biogen Inc. This page	90,000	$19,445,400
6	PFE	Pfizer Inc	435,000	$10,474,800
7	BMY	Bristol Myers Squibb Co	56,540	$3,257,834
8	GRFS	Grifols SA	435,361	$3,082,355

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$19,445,400	90,000	-55.3%	Shares	Sole	2026-08-14
2026-03-31	$36,916,612	201,367	-9.2%	Shares	Sole	2026-05-13
2025-12-31	$39,045,141	221,860	-12.4%	Shares	Sole	2026-02-13
2025-09-30	$35,461,392	253,151	-5.4%	Shares	Sole	2025-12-15
2025-06-30	$33,625,466	267,740	+33.5%	Shares	Sole	2025-08-18
2025-03-31	$27,439,156	200,520	-16.8%	Shares	Sole	2025-05-14
2024-12-31	$36,854,943	241,008	-19.7%	Shares	Sole	2025-02-14
2024-09-30	$58,152,000	300,000	+53.8%	Shares	Sole	2024-11-13
2024-06-30	$45,204,900	195,000	-13.3%	Shares	Sole	2024-08-14
2024-03-31	$48,516,750	225,000	+66.7%	Shares	Sole	2024-05-15
2023-12-31	$34,933,950	135,000	+63.6%	Shares	Sole	2024-02-14
2023-09-30	$21,203,325	82,500	+43.5%	Shares	Sole	2023-11-14
2023-06-30	$16,378,875	57,500	-47.4%	Shares	Sole	2023-08-14
2023-03-31	$30,390,347	109,306	+108.2%	Shares	Sole	2023-05-15
2022-12-31	$14,538,300	52,500	+10.5%	Shares	Sole	2023-02-14
2022-09-30	$12,682,500	47,500	+90.0%	Shares	Sole	2022-11-14
2022-06-30	$5,098,500	25,000	+66.7%	Shares	Sole	2022-08-12
2022-03-31	$3,159,000	15,000	-65.9%	Shares	Sole	2022-05-16
2021-12-31	$10,556,480	44,000	+120.0%	Shares	Sole	2022-02-14
2021-09-30	$5,659,800	20,000	+33.3%	Shares	Sole	2021-12-29
2021-06-30	$5,194,050	15,000	-25.0%	Shares	Sole	2021-08-16
2020-12-31	$4,897,200	20,000	-60.0%	Shares	Sole	2021-02-12
2020-09-30	$14,184,000	50,000	+5.3%	Shares	Sole	2020-11-12
2020-06-30	$12,708,625	47,500	+375.0%	Shares	Sole	2020-08-12
2020-03-31	$3,163,800	10,000	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.