Alyeska Investment Group
MASI

Alyeska Investment Group’s Masimo MASI Stock Holding History

Alyeska Investment 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 		– Sell
-1,259,307
Closed -$164M – 699
2025
Q4 		$164M Sell
1,259,307
-121,778
-9% -$17.4M 0.46% 42
2025
Q3 		$204M Buy
1,381,085
+246,595
+22% +$37.3M 0.62% 24
2025
Q2 		$191M Buy
1,134,490
+411,956
+57% +$65.8M 0.67% 23
2025
Q1 		$120M Buy
722,534
+143,899
+25% +$25M 0.48% 57
2024
Q4 		$95.6M Sell
578,635
-166,492
-22% -$26.3M 0.36% 69
2024
Q3 		$99.3M Buy
745,127
+314,196
+73% +$36.5M 0.51% 49
2024
Q2 		$54.3M Buy
430,931
+51,512
+14% +$6.78M 0.31% 110
2024
Q1 		$55.7M Sell
379,419
-155,296
-29% -$20.1M 0.34% 101
2023
Q4 		$62.7M Buy
+534,715
New +$49.8M 0.42% 77
2023
Q3 		– Sell
-204,409
Closed -$33.6M – 574
2023
Q2 		$33.6M Sell
204,409
-118,983
-37% -$20.7M 0.25% 133
2023
Q1 		$59.7M Buy
323,392
+67,595
+26% +$11.4M 0.52% 60
2022
Q4 		$37.8M Buy
255,797
+155,797
+156% +$21.4M 0.39% 85
2022
Q3 		$14.1M Sell
100,000
-231,194
-70% -$33.8M 0.16% 174
2022
Q2 		$43.3M Buy
331,194
+76,630
+30% +$10.3M 0.5% 57
2022
Q1 		$37M Buy
254,564
+145,429
+133% +$27.9M 0.41% 81
2021
Q4 		$32M Sell
109,135
-38,576
-26% -$11M 0.37% 95
2021
Q3 		$40M Buy
147,711
+146,246
+9,983% +$39.7M 0.49% 61
2021
Q2 		$355K Buy
+1,465
New +$334K ﹤0.01% 665
2020
Q4 		– Sell
-1,351
Closed -$319K – 567
2020
Q3 		$319K Buy
+1,351
New +$303K ﹤0.01% 433
2020
Q2 		– Sell
-5,006
Closed -$887K – 543
2020
Q1 		$887K Sell
5,006
-13,207
-73% -$2.27M 0.02% 301
2019
Q4 		$2.88M Buy
18,213
+14,324
+368% +$2.15M 0.04% 268
2019
Q3 		$579K Buy
+3,889
New +$591K 0.01% 352
2018
Q4 		– Sell
-4,831
Closed -$602K – 430
2018
Q3 		$602K Sell
4,831
-219,644
-98% -$24.4M 0.01% 371
2018
Q2 		$21.9M Buy
224,475
+75,280
+50% +$7.16M 0.2% 141
2018
Q1 		$13.1M Buy
+149,195
New +$13M 0.11% 202

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

Alyeska Investment Group's MASI Position: Q1 2026 in Review

Alyeska Investment Group sold out of Masimo (MASI) in Q1 2026, closing a stake of 1,259,307 shares — an estimated $164M sold.

Alyeska Investment Group first reported a position in MASI in Q1 2018 and held it in 25 quarters. The position peaked at $204M in Q3 2025. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Alyeska Investment Group reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • Alyeska Investment Group sold 1,259,307 Masimo shares in Q1 2026, an estimated $164M.
  • Alyeska Investment Group first reported a position in Masimo in Q1 2018 and held it in 25 quarters.
  • Alyeska Investment Group's Masimo position peaked at $204M in Q3 2025.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Alyeska Investment Group's 13F filing for Q1 2026, filed 15 May 2026.