Hudson Bay Capital Management LP

Position in RGNX — REGENXBIO Inc.

CIK 1393825 STAMFORD, CT

Position in RGNX

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

Position Value

$2,695,500

+$1,187,100 QoQ

Shares Held

225,000

+25.0% QoQ

Ownership

0.341%

of shares outstanding

% of Portfolio

0.01%

of 13F equity value

Holder Rank

#35

of 163 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Hudson Bay Capital Management LP holds $565,820,903 across 77 Biotechnology names. RGNX ranks #31 (0.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	VRTX	Vertex Pharmaceuticals Inc / Ma	390,440	$193,943,261
2	BMRN	Biomarin Pharmaceutical Inc	825,002	$47,206,614
3	ALNY	Alnylam Pharmaceuticals, Inc.	148,720	$44,769,181
4	BNTX	BioNTech SE	260,000	$24,193,000
5	IMCR	Immunocore Holdings plc	590,000	$18,732,500
6	TECH	BIO-TECHNE Corp	200,000	$14,130,000
7	VIR	Vir Biotechnology, Inc.	1,364,000	$13,899,160
8	PTCT	Ptc Therapeutics, Inc.	159,778	$13,033,091

26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$2,695,500	225,000	+25.0%	Shares	Sole	2026-08-14
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	2023-11-14
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	2023-05-15
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	2021-02-12
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.