Hudson Bay Capital Management LP

Position in PTCT — Ptc Therapeutics, Inc.

CIK 1393825 STAMFORD, CT

Position in PTCT

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

Position Value

$13,033,091

+$12,783,054 QoQ

Shares Held

159,778

+4253.6% QoQ

Ownership

0.191%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

#68

of 374 holders

Holding Since

Jun 2021

11 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Hudson Bay Capital Management LP holds $565,779,637 across 77 Biotechnology names. PTCT ranks #8 (2.3% 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. This page	159,778	$13,033,091

11 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$13,033,091	159,778	+4253.6%	Shares	Sole	2026-08-14
2026-03-31	$250,037	3,670	-87.8%	Shares	Defined	2026-05-13
2023-12-31	$826,800	30,000	0.0%	Shares	Sole	2024-02-14
2023-09-30	$672,300	30,000	-29.4%	Shares	Sole	2023-11-14
2022-12-31	$1,622,225	42,500	-29.2%	Shares	Sole	2023-02-14
2022-09-30	$3,012,000	60,000	-20.0%	Shares	Sole	2022-11-14
2022-06-30	$3,004,500	75,000	0.0%	Shares	Sole	2022-08-12
2022-03-31	$2,798,250	75,000	0.0%	Shares	Sole	2022-05-16
2021-12-31	$2,987,250	75,000	-16.7%	Shares	Sole	2022-02-14
2021-09-30	$3,348,900	90,000	+50.0%	Shares	Sole	2021-12-29
2021-06-30	$2,536,200	60,000	—	Shares	Sole	2021-08-16
No filing history on record for this holder in this stock.