WATER ISLAND CAPITAL LLC

Position in PEN — Penumbra Inc

CIK 1222765 NEW YORK, NY

Position in PEN

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

Position Value

$47,506,482

+$8,070,887 QoQ

Shares Held

150,456

+25.3% QoQ

Ownership

0.382%

of shares outstanding

% of Portfolio

6.89%

of 13F equity value

Holder Rank

#46

of 446 holders

Holding Since

Mar 2026

2 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

WATER ISLAND CAPITAL LLC holds $67,845,409 across 3 Medical Devices names. PEN ranks #1 (70.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PEN	Penumbra Inc This page	150,456	$47,506,482
2	AVNS	Avanos Medical, Inc.	799,002	$19,879,169
3	PACB	Pacific Biosciences Of California, Inc.	273,666	$459,758

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$47,506,482	150,456	+25.3%	Shares	Sole	2026-08-14
2026-03-31	$39,435,595	120,095	—	Shares	Sole	2026-05-15
No filing history on record for this holder in this stock.