DM
MASI

Deerfield Management’s Masimo MASI Stock Holding History

Deerfield 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 		– Sell
-16,147
Closed -$2.1M – 127
2025
Q4 		$2.1M Buy
+16,147
New +$2.31M 0.03% 95
2024
Q3 		– Sell
-1,848
Closed -$233K – 572
2024
Q2 		$233K Buy
+1,848
New +$243K ﹤0.01% 385

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

Deerfield Management's MASI Position: Q1 2026 in Review

Deerfield Management sold out of Masimo (MASI) in Q1 2026, closing a stake of 16,147 shares — an estimated $2.1M sold.

Deerfield Management first reported a position in MASI in Q2 2024 and held it in 2 quarters. The position peaked at $2.1M in Q4 2025. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Deerfield Management reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • Deerfield Management sold 16,147 Masimo shares in Q1 2026, an estimated $2.1M.
  • Deerfield Management first reported a position in Masimo in Q2 2024 and held it in 2 quarters.
  • Deerfield Management's Masimo position peaked at $2.1M in Q4 2025.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

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