Masimo Corp (MASI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

53,920,455Shares Outstanding

5,541,332Shares held by institutions

$968,015,287Value of institutional holdings

94.01%Institutional ownership %

-6.53%Shares Changed QoQ

365No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

The institutional landscape for Masimo Corp (NASDAQ:MASI) includes 365 filers as of the latest reporting cycle ending December 2025.

These investors collectively held 94.0% of the company's total shares outstanding in December 2025, down from 105.5% in September 2025.
The company experienced a -6.53% quarterly change in institutional shares held, alongside an increase of 1.39% in total owners annually.
The latest 13F cycle for Masimo reveals that of 365 total investors, 172 funds grew their exposure, whereas 123 reduced theirs and 70 made no changes.
Collectively, institutional investors decreased their stake in Masimo to 50.69Mn shares as of December 2025, a change that is down by 3.54Mn shares quarter on quarter and down 830.91K shares year over year.
With 8.86Mn shares, BlackRock, Inc. commands the largest institutional position in Masimo as of December 31, 2025, equating to 16.42% of the company.
Among the most significant buyers of Masimo during December 2025 were AQR CAPITAL MANAGEMENT LLC (1.06Mn), UBS Group AG (429.47K), NORGES BANK (377.42K), Qube Research & Technologies Ltd (293.54K), Schonfeld Strategic Advisors LLC (254.15K).
Leading sellers of Masimo stock in December 2025 included T. Rowe Price Investment Management, Inc. (1.53Mn), BlackRock, Inc. (1.51Mn), Capital Research Global Investors (1.22Mn), Liontrust Investment Partners LLP (762.40K), VIKING GLOBAL INVESTORS LP (559.09K).
The top 10 institutional holders of Masimo for the quarter ending December 2025 included BlackRock, Inc. (8.86Mn), FMR LLC (7.86Mn), Politan Capital Management LP (4.59Mn), VANGUARD GROUP INC (4.35Mn), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (2.66Mn), WESTFIELD CAPITAL MANAGEMENT CO LP (1.52Mn), STATE STREET CORP (1.42Mn), Alyeska Investment Group, L.P. (1.26Mn), AQR CAPITAL MANAGEMENT LLC (1.09Mn), GEODE CAPITAL MANAGEMENT, LLC (953.98K).

365 Institutional Holders

5,541,332 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	8,855,619	-1,505,472	-14.53%	$1,151,761,872.00
FMR LLC	31 Dec, 2025	7,864,164	-349,557	-4.26%	$1,022,813,172.00
Politan Capital Management LP	31 Dec, 2025	4,589,648	0	0.00%	$596,929,619.00
VANGUARD GROUP INC	31 Dec, 2025	4,348,786	-461,225	-9.59%	$565,603,107.00
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	31 Dec, 2025	2,663,875	43,915	1.68%	$346,463,583.00
WESTFIELD CAPITAL MANAGEMENT CO LP	31 Dec, 2025	1,522,049	102,799	7.24%	$197,957,646.00
STATE STREET CORP	31 Dec, 2025	1,415,196	-69,275	-4.67%	$184,060,392.00
Alyeska Investment Group, L.P.	31 Dec, 2025	1,259,307	-121,778	-8.82%	$163,785,468.00
AQR CAPITAL MANAGEMENT LLC	31 Dec, 2025	1,091,326	1,060,292	3,416.55%	$141,937,886.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	953,976	11,537	1.22%	$124,096,067.00
MORGAN STANLEY	31 Dec, 2025	920,735	230,134	33.32%	$119,751,047.00
RTW INVESTMENTS, LP	31 Dec, 2025	683,294	0	0.00%	$88,869,218.00
Capital Research Global Investors	31 Dec, 2025	637,894	-1,216,234	-65.60%	$82,964,494.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	636,698	-107,704	-14.47%	$82,808,942.00
Liontrust Investment Partners LLP	31 Dec, 2025	627,796	-762,399	-54.84%	$81,651,148.00
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	600,293	-1,526,470	-71.77%	$78,075.00
UBS Group AG	31 Dec, 2025	599,274	429,474	252.93%	$77,941,576.00
Squarepoint Ops LLC	31 Dec, 2025	583,747	-37,185	-5.99%	$75,922,135.00
VIKING GLOBAL INVESTORS LP	31 Dec, 2025	514,340	-559,093	-52.08%	$66,895,060.00
SCHRODER INVESTMENT MANAGEMENT GROUP	31 Dec, 2025	475,504	138,854	41.25%	$62,324,309.00

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