AH
MASI

Andreas Halvorsen’s Masimo MASI Stock Holding History

Andreas Halvorsen’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
-514,340
Closed -$66.9M – 88
2025
Q4 		$66.9M Sell
514,340
-559,093
-52% -$80.1M 0.18% 71
2025
Q3 		$158M Buy
1,073,433
+306,007
+40% +$46.3M 0.41% 60
2025
Q2 		$129M Buy
+767,426
New +$123M 0.37% 66

Other funds holding MASI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
PCM
Politan Capital Management New York $255M AUM 62.37% 1-Year Est. Return
PCM
Pentwater Capital Management Naples, Florida $16.4B AUM 55.44% 1-Year Est. Return
Barclays
Barclays London, United Kingdom $521B AUM 51.41% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $10.2B AUM 67.73% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Andreas Halvorsen's MASI Position: Q1 2026 in Review

Andreas Halvorsen sold out of Masimo (MASI) in Q1 2026, closing a stake of 514,340 shares — an estimated $66.9M sold.

Andreas Halvorsen first reported a position in MASI in Q2 2025 and held it in 3 quarters. The position peaked at $158M in Q3 2025. 451 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Andreas Halvorsen reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • Andreas Halvorsen sold 514,340 Masimo shares in Q1 2026, an estimated $66.9M.
  • Andreas Halvorsen first reported a position in Masimo in Q2 2025 and held it in 3 quarters.
  • Andreas Halvorsen's Masimo position peaked at $158M in Q3 2025.
  • 451 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Viking Global Investors's 13F filing for Q1 2026, filed 15 May 2026.