WATER ISLAND CAPITAL LLC

Position in MASI — Masimo Corp

CIK 1222765 NEW YORK, NY

Position in MASI

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$34,541,820

New position

Shares Held

194,197

first reported quarter

Ownership

0.371%

of shares outstanding

% of Portfolio

4.86%

of 13F equity value

Holder Rank

#54

of 445 holders

Holding Since

Mar 2026

1 quarter on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

WATER ISLAND CAPITAL LLC holds $74,336,507 across 3 Medical Devices names. MASI ranks #2 (46.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PEN	Penumbra Inc	120,095	$39,435,595
2	MASI	Masimo Corp This page	194,197	$34,541,820
3	PACB	Pacific Biosciences Of California, Inc.	272,040	$359,092

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$34,541,820	194,197	—	Shares	Sole	2026-05-15
No filing history on record for this holder in this stock.