ACM
MASI

ADAR1 Capital Management’s Masimo MASI Stock Holding History

ADAR1 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
2026
Q1 		$2.67M Hold
15,000
– – 0.16% 113
2025
Q4 		$1.95M Hold
15,000
– – 0.14% 100
2025
Q3 		$2.21M Buy
+15,000
New +$2.27M 0.21% 75
2024
Q4 		– Sell
-3,894
Closed -$519K – 265
2024
Q3 		$519K Buy
3,894
+3,856
+10,147% +$447K 0.08% 110
2024
Q2 		$4.79K Hold
38
– – ﹤0.01% 244
2024
Q1 		$5.58K Sell
38
-20
-34% -$2.58K ﹤0.01% 238
2023
Q4 		$6.8K Buy
+58
New +$5.41K ﹤0.01% 140

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

ADAR1 Capital Management's MASI Position: Q1 2026 in Review

ADAR1 Capital Management held its Masimo (MASI) position steady in Q1 2026 at 15,000 shares worth $2.67M. The position accounts for 0.16% of the portfolio, ranked #113.

ADAR1 Capital Management first reported a position in MASI in Q4 2023 and has held it in 7 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • ADAR1 Capital Management held 15,000 shares of Masimo worth $2.67M as of Q1 2026.
  • ADAR1 Capital Management left its Masimo share count unchanged in Q1 2026.
  • Masimo made up 0.16% of ADAR1 Capital Management's portfolio in Q1 2026, its #113 holding.
  • ADAR1 Capital Management first reported a position in Masimo in Q4 2023 and has held it in 7 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on ADAR1 Capital Management's 13F filing for Q1 2026, filed 18 May 2026.