Masimo Corp (MASI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

54,400,000Shares Outstanding

56,609,050Shares held by institutions

$10,100,752,792Value of institutional holdings

104.06%Institutional ownership %

1.51%Shares Changed QoQ

380No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Masimo Corp (NASDAQ:MASI) showed up in the 13F filings of 380 institutional investors as of December 2025.

Their combined ownership stood at 102.7% of 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.
Of these 380 funds, 183 grew their exposure to Masimo, 128 cut back, and 69 maintained positions.
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.
Hilltop National Bank holds the largest position in MASI at 218 shares as of December 31, 2025, or 0.0% of shares outstanding.
According to Business Quant data, leading holders of MASI for December 2025 are Hilltop National Bank (218), Investors Research Corp (50), ADIRONDACK TRUST CO (12).

380 Institutional Holders

56,609,050 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
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	2,930,451	803,688	37.79%	$381,136.00
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	31 Dec, 2025	2,663,875	43,915	1.68%	$346,463,583.00
NAYA CAPITAL MANAGEMENT UK LTD	31 Dec, 2025	1,560,697	1,560,697	0.00%	$202,984,252.00
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
Goldman Sachs Group Inc	31 Dec, 2025	1,273,396	528,994	71.06%	$165,617,884.00
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
Corient Private Wealth LLC	31 Dec, 2025	681,960	345,745	102.83%	$88,695,720.00
Capital Research Global Investors	31 Dec, 2025	637,894	-1,216,234	-65.60%	$82,964,494.00
Liontrust Investment Partners LLP	31 Dec, 2025	627,796	-762,399	-54.84%	$81,651,148.00
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

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