SFM
MASI

Soros Fund Management’s Masimo MASI Stock Holding History

Soros Fund 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 		$17.9M Buy
+100,838
New +$15.8M 0.2% 113
2017
Q4 		– Sell
-2,700
Closed -$234K – 244
2017
Q3 		$234K Buy
+2,700
New +$239K 0.01% 213

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

Soros Fund Management's MASI Position: Q1 2026 in Review

Soros Fund Management opened a new position in Masimo (MASI) in Q1 2026: 100,838 shares worth $17.9M. The stake represents 0.2% of the portfolio and ranks #113 among its holdings. This is a return to the name: Soros Fund Management previously reported a position in MASI as recently as Q3 2017.

Soros Fund Management first reported a position in MASI in Q3 2017 and has held it in 2 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Soros Fund Management held 100,838 shares of Masimo worth $17.9M as of Q1 2026.
  • Masimo was a new Soros Fund Management position in Q1 2026.
  • Masimo made up 0.2% of Soros Fund Management's portfolio in Q1 2026, its #113 holding.
  • Soros Fund Management first reported a position in Masimo in Q3 2017 and has held it in 2 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

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