Viking Global Investors
MASI

Viking Global Investors’s Masimo MASI Stock Holding History

Viking Global Investors’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 $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

Viking Global Investors's MASI Position: Q1 2026 in Review

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

Viking Global Investors first reported a position in MASI in Q2 2025 and held it in 3 quarters. The position peaked at $158M in Q3 2025. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Viking Global Investors reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • Viking Global Investors sold 514,340 Masimo shares in Q1 2026, an estimated $66.9M.
  • Viking Global Investors first reported a position in Masimo in Q2 2025 and held it in 3 quarters.
  • Viking Global Investors's Masimo position peaked at $158M in Q3 2025.
  • 445 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.