WP
MASI

Woodline Partners’s Masimo MASI Stock Holding History

Woodline Partners’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 		$27.3M Buy
+153,234
New +$24M 0.1% 267
2025
Q3 		– Sell
-182,709
Closed -$30.7M – 984
2025
Q2 		$30.7M Buy
182,709
+49,740
+37% +$7.94M 0.16% 186
2025
Q1 		$22.2M Buy
132,969
+81,784
+160% +$14.2M 0.14% 211
2024
Q4 		$8.46M Buy
51,185
+41,885
+450% +$6.61M 0.06% 382
2024
Q3 		$1.24M Sell
9,300
-176,690
-95% -$20.5M 0.01% 499
2024
Q2 		$23.4M Buy
185,990
+132,844
+250% +$17.5M 0.22% 144
2024
Q1 		$7.8M Sell
53,146
-229,129
-81% -$29.6M 0.07% 304
2023
Q4 		$33.1M Buy
282,275
+211,496
+299% +$19.7M 0.36% 81
2023
Q3 		$6.21M Buy
+70,779
New +$8.24M 0.07% 286
2023
Q1 		– Sell
-80,516
Closed -$11.9M – 718
2022
Q4 		$11.9M Buy
80,516
+63,017
+360% +$8.67M 0.16% 177
2022
Q3 		$2.47M Sell
17,499
-25,537
-59% -$3.73M 0.03% 434
2022
Q2 		$5.62M Buy
+43,036
New +$5.76M 0.09% 244

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

Woodline Partners's MASI Position: Q1 2026 in Review

Woodline Partners opened a new position in Masimo (MASI) in Q1 2026: 153,234 shares worth $27.3M. The stake represents 0.1% of the portfolio and ranks #267 among its holdings. This is a return to the name: Woodline Partners previously reported a position in MASI as recently as Q2 2025.

Woodline Partners first reported a position in MASI in Q2 2022 and has held it in 12 quarters since. The position peaked at $33.1M in Q4 2023. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Woodline Partners held 153,234 shares of Masimo worth $27.3M as of Q1 2026.
  • Masimo was a new Woodline Partners position in Q1 2026.
  • Masimo made up 0.1% of Woodline Partners's portfolio in Q1 2026, its #267 holding.
  • Woodline Partners first reported a position in Masimo in Q2 2022 and has held it in 12 quarters since.
  • Woodline Partners's Masimo position peaked at $33.1M in Q4 2023.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Woodline Partners's 13F filing for Q1 2026, filed 15 May 2026.