HBK Investments’s Masimo MASI Stock Holding History

HBK Investments’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
2023 Q4	–	Sell	-175,000	Closed	-$15.3M	–	252
2023 Q3	$15.3M	Buy	+175,000	New	+$20.4M	0.08%	58

Other funds holding MASI

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 London, United Kingdom $416B AUM 33.63% 1-Year Est. Return

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 Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

HBK Investments's MASI Position: Q1 2026 in Review

HBK Investments opened a new position in Masimo (MASI) in Q1 2026: 2,576,109 shares worth $458M. The stake represents 4.65% of the portfolio and ranks #6 among its holdings. This is a return to the name: HBK Investments previously reported a position in MASI as recently as Q3 2023.

HBK Investments first reported a position in MASI in Q2 2014 and has held it in 18 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

HBK Investments held 2,576,109 shares of Masimo worth $458M as of Q1 2026.
Masimo was a new HBK Investments position in Q1 2026.
Masimo made up 4.65% of HBK Investments's portfolio in Q1 2026, its #6 holding.
HBK Investments first reported a position in Masimo in Q2 2014 and has held it in 18 quarters since.
445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on HBK Investments's 13F filing for Q1 2026, filed 15 May 2026.