HE
MASI

Henry Ellenbogen’s Masimo MASI Stock Holding History

Henry Ellenbogen’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
Q4 		– Sell
-620,619
Closed -$91.6M – 47
2025
Q3 		$91.6M Sell
620,619
-543,279
-47% -$82.2M 0.68% 39
2025
Q2 		$196M Buy
1,163,898
+38,279
+3% +$6.11M 1.48% 29
2025
Q1 		$188M Buy
+1,125,619
New +$195M 1.68% 25

Other funds holding MASI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
PCM
Politan Capital Management New York $255M AUM 62.37% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
NCMU
NAYA Capital Management (UK) London, United Kingdom $2.08B AUM 63.16% 1-Year Est. Return
Westfield Capital Management
Westfield Capital Management Boston, Massachusetts $30.6B AUM 61.81% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $38.9B AUM 28.51% 1-Year Est. Return

Henry Ellenbogen's MASI Position: Q4 2025 in Review

Henry Ellenbogen sold out of Masimo (MASI) in Q4 2025, closing a stake of 620,619 shares — an estimated $91.6M sold.

Henry Ellenbogen first reported a position in MASI in Q1 2025 and held it in 3 quarters. The position peaked at $196M in Q2 2025. 391 funds tracked by Wall St. Rank hold MASI as of Q4 2025.

  • Henry Ellenbogen reported no remaining Masimo position as of Q4 2025 after selling out during the quarter.
  • Henry Ellenbogen sold 620,619 Masimo shares in Q4 2025, an estimated $91.6M.
  • Henry Ellenbogen first reported a position in Masimo in Q1 2025 and held it in 3 quarters.
  • Henry Ellenbogen's Masimo position peaked at $196M in Q2 2025.
  • 391 funds tracked by Wall St. Rank held Masimo as of Q4 2025.

Based on Durable Capital Partners's 13F filing for Q4 2025, filed 17 Feb 2026.