MASIMO CORP

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MASI·574795100·US·Common Stock·Healthcare - Medical Devices-Activist

MASI (MASIMO CORP) is held by 197 institutional investors as of Q1 2026. Largest holders: BlackRock, Inc. ($826.1M), Pentwater Capital Management LP ($564.9M), BARCLAYS PLC ($488.1M).

197

Holders

(14 Elite)

$7.4B

Total Value

58%

Consensus

13F: Mar 31, 2026Insider & Congress: Updated regularly

No verdict yet — fewer than 2 funds hold MASI.

Top Holders

Top Holders (197)History

AllNewIncreasedHeldDecreasedExited

Checking access…

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
BlackRock, Inc.	Decreased	4.6M(-47.5%)	$826.1M	0.0%	—	0
PEPentwater Capital Management LP	New	3.2M	$564.9M	2.9%	—	81
BARCLAYS PLC	Increased	2.7M(+4602.0%)	$488.1M	0.1%	—	60
HBK INVESTMENTS L P	New	2.6M	$458.2M	4.6%	—	87
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	Decreased	2.3M(-12.1%)	$416.7M	0.1%	—	0
VAVANGUARD CAPITAL MANAGEMENT LLC	New	2.1M	$364.6M	0.0%	—	43
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	2M	$357M	0.0%	—	43
FMR LLC	Decreased	1.5M(-81.5%)	$258.1M	0.0%	—	0
STATE STREET CORP	Increased	1.4M(+1.6%)	$255.7M	0.0%	—	31
MILLENNIUM MANAGEMENT LLC	Increased	988,853(+426.1%)	$175.9M	0.1%	—	49
GOLDMAN SACHS GROUP INC	Increased	984,192(+54.6%)	$175.1M	0.0%	—	43
GEODE CAPITAL MANAGEMENT, LLC	Increased	956,736(+0.3%)	$170.2M	0.0%	—	30
AQR CAPITAL MANAGEMENT LLC	Decreased	831,966(-23.8%)	$147.4M	0.1%	—	0
BALYASNY ASSET MANAGEMENT L.P.	New	770,986	$137.1M	0.2%	—	50
MORGAN STANLEY	Decreased	752,417(-18.3%)	$133.8M	0.0%	—	0
JPMORGAN CHASE & CO	Increased	572,645(+386.1%)	$101.5M	0.0%	—	48
CITIGROUP INC	Increased	533,388(+340.0%)	$94.9M	0.0%	—	48
FIL Ltd	New	482,000	$85.7M	0.1%	—	41
HSBC HOLDINGS PLC	New	473,434	$84.3M	0.0%	—	41
UBS Group AG	Decreased	468,257(-21.9%)	$83.3M	0.0%	—	0

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Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer