Mariner
MASI

Mariner’s Masimo MASI Stock Holding History

Mariner’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 		$10.9M Buy
61,265
+39,816
+186% +$6.25M 0.01% 702
2025
Q4 		$2.79M Buy
+21,449
New +$3.07M ﹤0.01% 1312
2025
Q2 		– Sell
-2,405
Closed -$400K – 3605
2025
Q1 		$400K Sell
2,405
-1,054
-30% -$183K ﹤0.01% 2383
2024
Q4 		$572K Buy
3,459
+321
+10% +$50.7K ﹤0.01% 2086
2024
Q3 		$418K Sell
3,138
-3,734
-54% -$433K ﹤0.01% 2286
2024
Q2 		$866K Buy
6,872
+2,008
+41% +$264K ﹤0.01% 1618
2024
Q1 		$714K Buy
4,864
+1,612
+50% +$208K ﹤0.01% 1749
2023
Q4 		$381K Buy
+3,252
New +$303K ﹤0.01% 2146
2023
Q3 		– Sell
-5,790
Closed -$953K – 2971
2023
Q2 		$953K Sell
5,790
-7
-0.1% -$1.22K ﹤0.01% 1342
2023
Q1 		$1.07M Sell
5,797
-2,096
-27% -$354K ﹤0.01% 1239
2022
Q4 		$1.17M Buy
7,893
+1,649
+26% +$227K ﹤0.01% 1159
2022
Q3 		$881K Buy
+6,244
New +$912K ﹤0.01% 1115

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

Mariner's MASI Position: Q1 2026 in Review

Mariner increased its Masimo (MASI) stake by 186% in Q1 2026, buying an estimated $6.25M and bringing the position to 61,265 shares worth $10.9M. The position accounts for 0.01% of the portfolio, ranked #702.

Mariner first reported a position in MASI in Q3 2022 and has held it in 12 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Mariner held 61,265 shares of Masimo worth $10.9M as of Q1 2026.
  • Mariner bought 39,816 Masimo shares in Q1 2026, an estimated $6.25M.
  • Masimo made up 0.01% of Mariner's portfolio in Q1 2026, its #702 holding.
  • Mariner first reported a position in Masimo in Q3 2022 and has held it in 12 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.