RTW INVESTMENTS, LP

Position in MASI — Masimo Corp

CIK 1493215 NEW YORK, NY

Position in MASI

as of Dec 31, 2025 · filed Feb 17, 2026 Compact

Position Value

$88,869,217

-$11,950,812 QoQ

Shares Held

683,294

0.0% QoQ

Ownership

1.30%

of shares outstanding

% of Portfolio

0.89%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

24 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

RTW INVESTMENTS, LP holds $406,195,732 across 5 Medical Devices names.

#	Ticker	Company	Shares	Value (USD)
1	IRTC	iRhythm Holdings, Inc.	1,668,500	$196,916,370
2	ESTA	Establishment Labs Holdings Inc.	2,655,695	$150,790,362
3	SYK	Stryker Corp	100,000	$32,859,000
4	BBNX	Beta Bionics, Inc.	2,000,000	$20,040,000
5	LMRI	Lumexa Imaging Holdings, Inc.	650,000	$5,590,000

24 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2025-12-31	$88,869,217	683,294	0.0%	Shares	Sole	2026-02-17
2025-09-30	$100,820,029	683,294	0.0%	Shares	Sole	2025-11-14
2025-06-30	$114,943,716	683,294	0.0%	Shares	Sole	2025-08-14
2025-03-31	$113,836,780	683,294	0.0%	Shares	Sole	2025-05-15
2024-12-31	$112,948,498	683,294	-53.3%	Shares	Sole	2025-02-14
2024-09-30	$194,981,792	1,462,400	0.0%	Shares	Sole	2024-11-14
2024-06-30	$184,174,656	1,462,400	0.0%	Shares	Sole	2024-08-14
2024-03-31	$214,753,440	1,462,400	0.0%	Shares	Sole	2024-05-15
2023-12-31	$171,407,904	1,462,400	-2.6%	Shares	Sole	2024-02-14
2023-09-30	$131,650,906	1,501,493	0.0%	Shares	Sole	2023-11-14
2023-06-30	$247,070,673	1,501,493	0.0%	Shares	Sole	2023-08-14
2023-03-31	$277,085,518	1,501,493	0.0%	Shares	Sole	2023-05-15
2022-12-31	$222,145,889	1,501,493	+4.3%	Shares	Sole	2023-02-14
2022-09-30	$203,269,411	1,439,993	+6.6%	Shares	Sole	2022-11-14
2022-06-30	$176,534,255	1,350,993	+19.8%	Shares	Sole	2022-08-15
2022-03-31	$164,109,885	1,127,593	+32.7%	Shares	Sole	2022-05-16
2021-12-31	$248,854,509	849,971	+2.1%	Shares	Sole	2022-02-14
2021-09-30	$225,376,903	832,540	+0.8%	Shares	Sole	2021-11-15
2021-06-30	$200,314,614	826,210	+38.9%	Shares	Sole	2021-08-13
2021-03-31	$136,637,594	594,956	+26.7%	Shares	Sole	2021-05-14
2020-12-31	$125,981,866	469,416	+4.2%	Shares	Sole	2021-02-16
2020-09-30	$106,319,063	450,390	+15.8%	Shares	Sole	2020-11-16
2020-06-30	$88,637,040	388,776	+1.5%	Shares	Sole	2020-08-14
2020-03-31	$67,821,904	382,915	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.