Balyasny Asset Management
MASI

Balyasny Asset Management’s Masimo MASI Stock Holding History

Balyasny Asset 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 		$15.1M Buy
+85,100
New +$13.4M 0.02% 813
2024
Q1 		– Sell
-107,400
Closed -$12.6M – 2903
2023
Q4 		$12.6M Sell
107,400
-256,600
-70% -$23.9M 0.02% 781
2023
Q3 		$31.9M Buy
364,000
+299,000
+460% +$34.8M 0.07% 405
2023
Q2 		$10.7M Buy
65,000
+26,200
+68% +$4.56M 0.02% 744
2023
Q1 		$7.16M Buy
+38,800
New +$6.55M 0.02% 926
2018
Q2 		– Sell
-125,000
Closed -$11M – 1998
2018
Q1 		$11M Buy
+125,000
New +$10.9M 0.05% 498

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 $315B AUM 27.84% 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

Balyasny Asset Management's MASI Position: Q1 2026 in Review

Balyasny Asset Management opened a new position in Masimo (MASI) in Q1 2026: 770,986 shares worth $137M. The stake represents 0.18% of the portfolio and ranks #114 among its holdings. This is a return to the name: Balyasny Asset Management previously reported a position in MASI as recently as Q2 2024.

Balyasny Asset Management first reported a position in MASI in Q2 2013 and has held it in 27 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Balyasny Asset Management held 770,986 shares of Masimo worth $137M as of Q1 2026.
  • Masimo was a new Balyasny Asset Management position in Q1 2026.
  • Masimo made up 0.18% of Balyasny Asset Management's portfolio in Q1 2026, its #114 holding.
  • Balyasny Asset Management first reported a position in Masimo in Q2 2013 and has held it in 27 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Balyasny Asset Management's 13F filing for Q1 2026, filed 15 May 2026.