PCM
MASI

Pentwater Capital Management’s Masimo MASI Stock Holding History

Pentwater Capital Management’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 		$565M Buy
+3,176,000
New +$498M 2.93% 10

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
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
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Pentwater Capital Management's MASI Position: Q1 2026 in Review

Pentwater Capital Management opened a new position in Masimo (MASI) in Q1 2026: 3,176,000 shares worth $565M. The stake represents 2.93% of the portfolio and ranks #10 among its holdings.

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

  • Pentwater Capital Management held 3,176,000 shares of Masimo worth $565M as of Q1 2026.
  • Masimo was a new Pentwater Capital Management position in Q1 2026.
  • Masimo made up 2.93% of Pentwater Capital Management's portfolio in Q1 2026, its #10 holding.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

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