Hudson Bay Capital Management LP

Position in RGNX — REGENXBIO Inc.

CIK 1393825 STAMFORD, CT

Position in RGNX

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

Position Value

$1,508,400

-$507,600 QoQ

Shares Held

180,000

+28.6% QoQ

Ownership

0.348%

of shares outstanding

% of Portfolio

0.01%

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")%

Healthcare · as of Mar 31, 2026

Hudson Bay Capital Management LP holds $534,286,565 across 150 Biotechnology names. RGNX ranks #52 (0.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BMRN	Biomarin Pharmaceutical Inc	974,776	$55,065,096
2	APLS	Apellis Pharmaceuticals, Inc.	1,190,416	$47,890,435
3	REGN	Regeneron Pharmaceuticals, Inc.	32,001	$24,725,252
4	BNTX	BioNTech SE	275,000	$24,442,000
5	IONS	Ionis Pharmaceuticals Inc	295,100	$22,159,059
6	ARGX	Argenx SE	30,000	$21,907,500
7	VRTX	Vertex Pharmaceuticals Inc / Ma	45,000	$20,094,300
8	IMCR	Immunocore Holdings plc	633,174	$19,090,196

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$1,508,400	180,000	+28.6%	Shares	Sole	2026-05-13
2025-12-31	$2,016,000	140,000	-30.0%	Shares	Sole	2026-02-13
2025-09-30	$1,930,000	200,000	-9.1%	Shares	Sole	2025-12-15
2025-06-30	$1,806,200	220,000	-25.4%	Shares	Sole	2025-08-18
2025-03-31	$2,109,250	295,000	-4.3%	Shares	Sole	2025-05-14
2024-12-31	$2,381,613	308,100	+43.3%	Shares	Sole	2025-02-14
2024-09-30	$2,255,350	215,000	+30.3%	Shares	Sole	2024-11-13
2024-06-30	$1,930,500	165,000	+267.5%	Shares	Sole	2024-08-14
2024-03-31	$946,043	44,900	-50.1%	Shares	Sole	2024-05-15
2023-12-31	$1,615,500	90,000	-21.7%	Shares	Sole	2024-02-14
2023-09-30	$1,892,900	115,000	+35.3%	Shares	Sole	2023-12-07
2023-06-30	$1,699,150	85,000	+39.8%	Shares	Sole	2023-08-14
2023-03-31	$1,149,728	60,800	+35.1%	Shares	Sole	2023-05-16
2022-12-31	$1,020,600	45,000	+125.0%	Shares	Sole	2023-02-14
2022-09-30	$528,600	20,000	-71.4%	Shares	Sole	2022-11-14
2022-06-30	$1,729,000	70,000	+7.7%	Shares	Sole	2022-08-12
2022-03-31	$2,157,350	65,000	0.0%	Shares	Sole	2022-05-16
2021-12-31	$2,125,500	65,000	+30.0%	Shares	Sole	2022-02-14
2021-09-30	$2,096,000	50,000	-35.5%	Shares	Sole	2021-12-29
2021-06-30	$3,010,875	77,500	+68.0%	Shares	Sole	2021-08-16
2021-03-31	$1,573,835	46,140	+15.3%	Shares	Sole	2021-05-14
2020-12-31	$1,814,400	40,000	-84.8%	Shares	Sole	2021-03-04
2020-09-30	$7,237,760	263,000	+19.5%	Shares	Sole	2020-11-12
2020-06-30	$8,102,600	220,000	+76.0%	Shares	Sole	2020-08-12
2020-03-31	$4,047,500	125,000	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.