Hudson Bay Capital Management
MASI

Hudson Bay Capital Management’s Masimo MASI Stock Holding History

Hudson Bay 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 		$58.8M Buy
+330,679
New +$51.9M 0.2% 89
2023
Q4 		– Sell
-142,524
Closed -$12.5M – 826
2023
Q3 		$12.5M Buy
+142,524
New +$16.6M 0.1% 134

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

Hudson Bay Capital Management's MASI Position: Q1 2026 in Review

Hudson Bay Capital Management opened a new position in Masimo (MASI) in Q1 2026: 330,679 shares worth $58.8M. The stake represents 0.2% of the portfolio and ranks #89 among its holdings. This is a return to the name: Hudson Bay Capital Management previously reported a position in MASI as recently as Q3 2023.

Hudson Bay Capital Management first reported a position in MASI in Q3 2023 and has held it in 2 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Hudson Bay Capital Management held 330,679 shares of Masimo worth $58.8M as of Q1 2026.
  • Masimo was a new Hudson Bay Capital Management position in Q1 2026.
  • Masimo made up 0.2% of Hudson Bay Capital Management's portfolio in Q1 2026, its #89 holding.
  • Hudson Bay Capital Management first reported a position in Masimo in Q3 2023 and has held it in 2 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

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