Masimo Corp (MASI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

1,163,792Shares held by institutions

$206,375,235Value of institutional holdings

104.79%Institutional ownership %

5.40%Shares Changed QoQ

376No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Masimo Corp (NASDAQ:MASI) has 380 institutional investors with active 13F positions as of December 2025.

These investors collectively held 102.7% of Masimo's outstanding shares in December 2025, down from 105.6% in September 2025.
Their total shares held in MASI increased 0.43% from the prior quarter, while the number of investors in Masimo increased 5.26% year over year.
Among the 380 funds, 183 bought more Masimo shares, 128 sold down, and 69 held their ground.
Institutional investors collectively held 55.89Mn shares in Masimo as of December 2025, up by 238.01K shares quarter on quarter, and up 2.84Mn shares year over year.
BlackRock, Inc. leads ownership in MASI with 8.86Mn shares as of December 31, 2025, equal to 16.28% of outstanding shares.
Leading buyers of Masimo shares for the quarter ending December 2025 were NAYA CAPITAL MANAGEMENT UK LTD (1.56Mn), AQR CAPITAL MANAGEMENT LLC (1.06Mn), T. Rowe Price Investment Management, Inc. (803.69K), UBS Group AG (429.47K), NORGES BANK (377.42K).
The largest sales of MASI for the quarter ending December 2025 came from BlackRock, Inc. (1.51Mn), Capital Research Global Investors (1.22Mn), Liontrust Investment Partners LLP (762.4K), VIKING GLOBAL INVESTORS LP (559.09K), Bank Of America Corp /De/ (525.42K).
Per Business Quant data, the top 10 holders of Masimo for the quarter ending December 2025 are BlackRock, Inc. (8.86Mn), FMR LLC (7.86Mn), Politan Capital Management LP (4.59Mn), VANGUARD GROUP INC (4.35Mn), T. Rowe Price Investment Management, Inc. (2.93Mn), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (2.66Mn), NAYA CAPITAL MANAGEMENT UK LTD (1.56Mn), WESTFIELD CAPITAL MANAGEMENT CO LP (1.52Mn), State Street Corp (1.42Mn), Alyeska Investment Group, L.P. (1.26Mn).

380 Institutional Holders

1,163,792 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	-1,505,472	-14.53%	$0.00
FMR LLC	31 Dec, 2025	-349,557	-4.26%	$0.00
Politan Capital Management LP	31 Dec, 2025	0	0.00%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	25,394	17.22%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	-461,225	-9.59%	$0.00
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	803,688	37.79%	$0.00
Barclays Plc	31 Dec, 2025	-59,403	-50.44%	$0.00
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	31 Dec, 2025	43,915	1.68%	$0.00
NAYA CAPITAL MANAGEMENT UK LTD	31 Dec, 2025	1,560,697	0.00%	$0.00
WESTFIELD CAPITAL MANAGEMENT CO LP	31 Dec, 2025	102,799	7.24%	$0.00
Corient Private Wealth LLC	31 Dec, 2025	345,745	102.83%	$0.00
State Street Corp	31 Dec, 2025	-69,275	-4.67%	$0.00
UBS Group AG	31 Dec, 2025	429,474	252.93%	$0.00
Alyeska Investment Group, L.P.	31 Dec, 2025	-121,778	-8.82%	$0.00
Squarepoint Ops LLC	31 Dec, 2025	-37,185	-5.99%	$0.00
AQR CAPITAL MANAGEMENT LLC	31 Dec, 2025	1,060,292	3,416.55%	$0.00
Qube Research & Technologies Ltd	31 Dec, 2025	293,536	0.00%	$0.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	11,537	1.22%	$0.00
Schonfeld Strategic Advisors LLC	31 Dec, 2025	254,152	2,335.10%	$0.00
Morgan Stanley	31 Dec, 2025	230,134	33.32%	$0.00

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