Penbrook Management LLC

Position in PRTA — Prothena Corp Public Ltd Co

CIK 1381055 NEW YORK, NY

Position in PRTA

as of Jun 30, 2026 · filed Jul 23, 2026 Compact

Position Value

$2,660,138

+$19,020 QoQ

Shares Held

271,720

0.0% QoQ

Ownership

0.529%

of shares outstanding

% of Portfolio

1.80%

of 13F equity value

Holder Rank

#31

of 187 holders

Holding Since

Mar 2026

2 quarters on record

Voting authority Sole 0% Shared 0% None 100%

Healthcare · as of Jun 30, 2026

Penbrook Management LLC holds $4,585,431 across 4 Biotechnology names. PRTA ranks #1 (58.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PRTA	Prothena Corp Public Ltd Co This page	271,720	$2,660,138
2	MESO	Mesoblast Ltd	87,075	$1,178,124
3	REGN	Regeneron Pharmaceuticals, Inc.	785	$489,478
4	IOVA	Iovance Biotherapeutics, Inc.	61,945	$257,691

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$2,660,138	271,720	0.0%	Shares	Sole	2026-07-23
2026-03-31	$2,641,118	271,720	—	Shares	Sole	2026-04-21
No filing history on record for this holder in this stock.