Masimo Corp (MASI) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

54,400,000Shares Outstanding

56,617,257Shares held by institutions

$10,102,783,339Value of institutional holdings

104.08%Institutional ownership %

1.52%Shares Changed QoQ

381No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Masimo Corp (NASDAQ:MASI) appears in 380 institutional 13F filings for the quarter ending December 2025.

These investors held 102.7% of outstanding shares in December 2025, down from 105.6% in September 2025.
They increased total shares held in MASI by 0.43% quarter over quarter, and investors in Masimo increased 5.26% from a year ago.
During the quarter, 183 of these 380 funds increased positions in MASI, 128 reduced exposure, and 69 held steady.
Altogether, these fund groups held 55.89Mn shares in MASI by December 2025, up by 238.01K shares quarter on quarter, and up 2.84Mn shares year over year.
As of December 31, 2025, the biggest holder of Masimo is SG Americas Securities, LLC at 522.82K shares, representing 0.96% of shares outstanding.
Leading buyers of Masimo shares for the quarter ending December 2025 were SG Americas Securities, LLC (506.4K), ALPINE ASSOCIATES MANAGEMENT INC. (189.0K), CIBRA Capital Ltd (90.38K), Capricorn Fund Managers Ltd (22.81K), WEALTH ENHANCEMENT ADVISORY SERVICES, LLC (16.84K).
The largest sales of MASI for the quarter ending December 2025 came from Sterling Capital Management LLC (10.56K), Avior Wealth Management, LLC (2.39K), Krilogy Financial LLC (1.48K), LOCKERMAN FINANCIAL GROUP, INC. (1.3K), YOUSIF CAPITAL MANAGEMENT, LLC (660).
Per Business Quant data, the top 10 holders of Masimo for the quarter ending December 2025 are SG Americas Securities, LLC (522.82K), ALPINE ASSOCIATES MANAGEMENT INC. (189.0K), CIBRA Capital Ltd (90.38K), Retirement Systems of Alabama (55.97K), STRS OHIO (37.21K), Westmount Partners, LLC (24.23K), Capricorn Fund Managers Ltd (22.81K), Cardinal Capital Management (22.13K), WEALTH ENHANCEMENT ADVISORY SERVICES, LLC (16.84K), YOUSIF CAPITAL MANAGEMENT, LLC (13.87K).

385 Institutional Holders

56,617,257 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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