WG
MASI

Winton Group’s Masimo MASI Stock Holding History

Winton Group’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 		$20.1M Buy
+112,783
New +$17.7M 0.7% 14
2025
Q3 		– Sell
-5,617
Closed -$945K – 908
2025
Q2 		$945K Buy
+5,617
New +$897K 0.05% 449
2025
Q1 		– Sell
-4,410
Closed -$729K – 747
2024
Q4 		$729K Sell
4,410
-3,302
-43% -$521K 0.05% 404
2024
Q3 		$1.03M Buy
+7,712
New +$895K 0.07% 309
2023
Q3 		– Sell
-1,509
Closed -$248K – 868
2023
Q2 		$248K Sell
1,509
-1,990
-57% -$346K 0.02% 592
2023
Q1 		$646K Buy
3,499
+438
+14% +$73.9K 0.04% 599
2022
Q4 		$453K Sell
3,061
-1,456
-32% -$200K 0.03% 662
2022
Q3 		$638K Buy
+4,517
New +$660K 0.04% 568
2021
Q4 		– Sell
-4,366
Closed -$1.18M – 1245
2021
Q3 		$1.18M Buy
+4,366
New +$1.18M 0.07% 418
2020
Q2 		– Sell
-2,899
Closed -$513K – 1530
2020
Q1 		$513K Sell
2,899
-5,443
-65% -$934K 0.01% 1020
2019
Q4 		$1.32M Buy
+8,342
New +$1.25M 0.02% 958
2019
Q3 		– Sell
-8,899
Closed -$1.32M – 1619
2019
Q2 		$1.32M Buy
8,899
+3,366
+61% +$462K 0.03% 348
2019
Q1 		$765K Sell
5,533
-1,526
-22% -$192K 0.02% 423
2018
Q4 		$758K Sell
7,059
-2,660
-27% -$297K 0.02% 382
2018
Q3 		$1.21M Sell
9,719
-1,287
-12% -$143K 0.03% 370
2018
Q2 		$1.07M Sell
11,006
-53,602
-83% -$5.1M 0.03% 411
2018
Q1 		$5.68M Buy
64,608
+16,477
+34% +$1.44M 0.16% 200
2017
Q4 		$4.08M Sell
48,131
-67
-0.1% -$5.81K 0.12% 297
2017
Q3 		$4.17M Buy
+48,198
New +$4.26M 0.13% 180
2014
Q4 		– Sell
-14,879
Closed -$317K – 646
2014
Q3 		$317K Sell
14,879
-20,602
-58% -$470K ﹤0.01% 627
2014
Q2 		$837K Buy
+35,481
New +$880K 0.01% 551

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

Winton Group's MASI Position: Q1 2026 in Review

Winton Group opened a new position in Masimo (MASI) in Q1 2026: 112,783 shares worth $20.1M. The stake represents 0.7% of the portfolio and ranks #14 among its holdings. This is a return to the name: Winton Group previously reported a position in MASI as recently as Q2 2025.

Winton Group first reported a position in MASI in Q2 2014 and has held it in 21 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Winton Group held 112,783 shares of Masimo worth $20.1M as of Q1 2026.
  • Masimo was a new Winton Group position in Q1 2026.
  • Masimo made up 0.7% of Winton Group's portfolio in Q1 2026, its #14 holding.
  • Winton Group first reported a position in Masimo in Q2 2014 and has held it in 21 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Winton Group's 13F filing for Q1 2026, filed 12 May 2026.