WIC
MASI

Water Island Capital’s Masimo MASI Stock Holding History

Water Island Capital’s Portfolio MASI Stock Details MASI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$34.5M Buy
+194,197
New +$30.5M 3.86% 9

Other funds holding MASI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
PCM
Politan Capital Management New York $985M AUM 3.12% 1-Year Est. Return
PCM
Pentwater Capital Management Naples, Florida $19.3B AUM 58.13% 1-Year Est. Return
Barclays
Barclays London, United Kingdom $416B AUM 33.63% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Water Island Capital's MASI Position: Q1 2026 in Review

Water Island Capital opened a new position in Masimo (MASI) in Q1 2026: 194,197 shares worth $34.5M. The stake represents 3.86% of the portfolio and ranks #9 among its holdings.

445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Water Island Capital held 194,197 shares of Masimo worth $34.5M as of Q1 2026.
  • Masimo was a new Water Island Capital position in Q1 2026.
  • Masimo made up 3.86% of Water Island Capital's portfolio in Q1 2026, its #9 holding.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Water Island Capital's 13F filing for Q1 2026, filed 15 May 2026.