MILLENNIUM MANAGEMENT LLC

Position in MASI — Masimo Corp

CIK 1273087 NEW YORK, NY

Back to MASI Full portfolio

Position in MASI

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$175,887,283

+$151,440,556 QoQ

Shares Held

988,853

+426.1% QoQ

Ownership

1.89%

of shares outstanding

% of Portfolio

0.16%

of 13F equity value

Holder Rank

#10

of 445 holders

Holding Since

Mar 2020

24 quarters on record

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

Common Shares in MASI Over Time

Shares Held

Position Value (USD)

Derivatives in MASI

reported options exposure · as of Mar 31, 2026

CallValue

$51,333,282

CallShares

288,600

PutValue

PutShares

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Medical Devices

Healthcare · as of Mar 31, 2026

MILLENNIUM MANAGEMENT LLC holds $2,438,858,395 across 79 Medical Devices names. MASI ranks #4 (7.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PEN	Penumbra Inc	1,098,136	$360,594,918
2	BSX	Boston Scientific Corp	4,337,804	$272,197,201
3	IRTC	iRhythm Holdings, Inc.	1,608,014	$189,777,812
4	MASI	Masimo Corp This page	988,853	$175,887,283
5	LIVN	LivaNova PLC	2,438,671	$155,001,928
6	EW	Edwards Lifesciences Corp	1,796,821	$143,889,425
7	GMED	Globus Medical Inc	1,643,352	$141,591,208
8	ABT	Abbott Laboratories	1,323,342	$135,867,523

All Filings in MASI

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50 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$51,333,282	288,600	-70.8%	Call	Sole	2026-05-15
2026-03-31	$175,887,283	988,853	+426.1%	Shares	Sole	2026-05-15
2025-12-31	$24,446,727	187,965	+1065.2%	Shares	Sole	2026-02-17
2025-09-30	$2,380,129	16,131	+312.9%	Shares	Sole	2025-11-14
2025-06-30	$657,235	3,907	-60.9%	Shares	Sole	2025-08-14
2025-03-31	$1,666,000	10,000	-92.6%	Put	Sole	2025-05-15
2025-03-31	$22,458,679	134,806	+439.2%	Shares	Sole	2025-05-15
2024-12-31	$4,132,500	25,000	-93.9%	Call	Sole	2025-02-14
2024-12-31	$67,451,987	408,058	+1294.9%	Shares	Sole	2025-02-14
2024-09-30	$3,900,302	29,253	+983.4%	Shares	Sole	2024-11-14
2024-09-30	$359,991	2,700	-91.1%	Put	Sole	2024-11-14
2024-09-30	$4,053,232	30,400	+1221.7%	Call	Sole	2024-11-14
2024-06-30	$289,662	2,300	-99.7%	Put	Sole	2024-08-14
2024-06-30	$94,926,393	753,743	+14121.6%	Shares	Sole	2024-08-14
2024-03-31	$778,305	5,300	-98.5%	Put	Sole	2024-05-15
2024-03-31	$50,959,299	347,016	+1635.1%	Shares	Sole	2024-05-15
2023-12-31	$2,344,200	20,000	-89.8%	Call	Sole	2024-02-14
2023-12-31	$23,027,076	196,460	+98.4%	Shares	Sole	2024-02-14
2023-09-30	$8,680,320	99,000	-59.0%	Call	Sole	2023-11-14
2023-09-30	$21,148,503	241,201	+431.3%	Shares	Sole	2023-11-14
2023-09-30	$3,980,672	45,400	-79.3%	Put	Sole	2023-11-14
2023-06-30	$36,033,488	218,982	+1359.9%	Shares	Sole	2023-08-14
2023-06-30	$2,468,250	15,000	-96.2%	Call	Sole	2023-08-14
2023-03-31	$72,995,350	395,553	+5550.8%	Shares	Sole	2023-05-15
2023-03-31	$1,291,780	7,000	-53.3%	Put	Sole	2023-05-15
2022-12-31	$2,219,250	15,000	-92.1%	Call	Sole	2023-02-14
2022-12-31	$28,248,981	190,936	+2627.7%	Shares	Sole	2023-02-14
2022-09-30	$988,120	7,000	-98.7%	Put	Sole	2022-11-14
2022-09-30	$77,444,046	548,626	+27331.3%	Shares	Sole	2022-11-14
2022-09-30	$282,320	2,000	-99.7%	Call	Sole	2022-11-14
2022-06-30	$94,364,516	722,159	+1945.8%	Shares	Sole	2022-08-15
2022-06-30	$4,612,651	35,300	+242.7%	Put	Sole	2022-08-15
2022-06-30	$1,345,901	10,300	-98.9%	Call	Sole	2022-08-15
2022-03-31	$140,401,419	964,693	+2412.2%	Shares	Sole	2022-05-16
2022-03-31	$5,588,736	38,400	+166.7%	Call	Sole	2022-05-16
2022-03-31	$2,095,776	14,400	-94.0%	Put	Sole	2022-05-16
2021-12-31	$70,484,735	240,743	+501.9%	Shares	Sole	2022-02-14
2021-12-31	$11,711,200	40,000	+100.0%	Put	Sole	2022-02-14
2021-12-31	$5,855,600	20,000	-66.7%	Call	Sole	2022-02-14
2021-09-30	$16,242,600	60,000	+1100.0%	Call	Sole	2021-11-15
2021-09-30	$1,353,550	5,000	-80.0%	Put	Sole	2021-11-15
2021-09-30	$6,765,584	24,992	+25.0%	Shares	Sole	2021-11-15
2021-06-30	$4,849,000	20,000	+91.4%	Put	Sole	2021-08-16
2021-06-30	$2,533,844	10,451	-73.9%	Shares	Sole	2021-08-16
2021-06-30	$9,698,000	40,000	+700.0%	Call	Sole	2021-08-16
2021-03-31	$1,148,300	5,000	-66.7%	Put	Sole	2021-05-17
2021-03-31	$3,444,900	15,000	-73.9%	Call	Sole	2021-05-17
2021-03-31	$13,214,636	57,540	+43.9%	Shares	Sole	2021-05-17
2020-09-30	$9,442,400	40,000	-35.4%	Call	Sole	2020-11-16
2020-06-30	$14,115,316	61,912	—	Shares	Sole	2020-08-14
No filing history on record for this holder in this stock.