ACM
MASI

Atika Capital Management’s Masimo MASI Stock Holding History

Atika 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
2025
Q1 		– Sell
-36,800
Closed -$6.08M – 83
2024
Q4 		$6.08M Buy
+36,800
New +$5.81M 0.65% 57

Other funds holding MASI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
PCM
Politan Capital Management New York $985M AUM 3.12% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $41.5B AUM 42.97% 1-Year Est. Return
DCP
Durable Capital Partners Bethesda, Maryland $9.71B AUM 26.27% 1-Year Est. Return

Atika Capital Management's MASI Position: Q1 2025 in Review

Atika Capital Management sold out of Masimo (MASI) in Q1 2025, closing a stake of 36,800 shares — an estimated $6.08M sold.

Atika Capital Management first reported a position in MASI in Q4 2024 and held it in 1 quarter. The position peaked at $6.08M in Q4 2024. 394 funds tracked by Wall St. Rank hold MASI as of Q1 2025.

  • Atika Capital Management reported no remaining Masimo position as of Q1 2025 after selling out during the quarter.
  • Atika Capital Management sold 36,800 Masimo shares in Q1 2025, an estimated $6.08M.
  • Atika Capital Management first reported a position in Masimo in Q4 2024 and held it in 1 quarter.
  • Atika Capital Management's Masimo position peaked at $6.08M in Q4 2024.
  • 394 funds tracked by Wall St. Rank held Masimo as of Q1 2025.

Based on Atika Capital Management's 13F filing for Q1 2025, filed 14 May 2025.