LMR Partners’s Masimo MASI Stock Holding History

LMR 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	$2.9M	Buy	+16,300	New	+$2.56M	0.01%	783
2025 Q1	–	Sell	-42,448	Closed	-$7.02M	–	1540
2024 Q4	$7.02M	Buy	+42,448	New	+$6.7M	0.06%	313
2024 Q3	–	Sell	-40,354	Closed	-$5.08M	–	1429
2024 Q2	$5.08M	Buy	+40,354	New	+$5.31M	0.04%	325
2024 Q1	–	Sell	-6,768	Closed	-$793K	–	1250
2023 Q4	$793K	Buy	6,768 +2,297	+51%	+$214K	0.01%	605
2023 Q3	$392K	Buy	+4,471	New	+$520K	﹤0.01%	582
2020 Q2	–	Sell	-8,865	Closed	-$1.59M	–	631
2020 Q1	$1.59M	Buy	+8,865	New	+$1.52M	0.07%	109
2018 Q4	–	Sell	-3,372	Closed	-$420K	–	423
2018 Q3	$420K	Sell	3,372 -60,702	-95%	-$6.73M	0.03%	208
2018 Q2	$6.26M	Buy	+64,074	New	+$6.09M	0.32%	75

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

HBK Investments Dallas, Texas $9.85B AUM 55.6% 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

LMR Partners's MASI Position: Q1 2026 in Review

LMR Partners opened a new position in Masimo (MASI) in Q1 2026: 16,300 shares worth $2.9M. The stake represents 0.01% of the portfolio and ranks #783 among its holdings. This is a return to the name: LMR Partners previously reported a position in MASI as recently as Q4 2024.

LMR Partners first reported a position in MASI in Q2 2018 and has held it in 8 quarters since. The position peaked at $7.02M in Q4 2024. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

LMR Partners held 16,300 shares of Masimo worth $2.9M as of Q1 2026.
Masimo was a new LMR Partners position in Q1 2026.
Masimo made up 0.01% of LMR Partners's portfolio in Q1 2026, its #783 holding.
LMR Partners first reported a position in Masimo in Q2 2018 and has held it in 8 quarters since.
LMR Partners's Masimo position peaked at $7.02M in Q4 2024.
445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

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