MASI

MASIMO CORP
USCUSIP 574795100
Institutional Owners
170
+45 QoQ
13F Value Held
$2.6B
Insider Net · 180d
$0
0↑ 0↓
Recent Filings
0
Smart-money sentimentBullish
BearishBullish
13F funds (latest Q)72 adding · 24 trimming
Insider net (180d)+$0
Price history not yet available for MASI.

Top institutional holders

170 13F filers
#FundPosition valueSharesLast moveAs of
1HBK INVESTMENTS L P
$458.2M
2.58MNewQ1 2026
2VANGUARD CAPITAL MANAGEMENT LLC
$364.6M
2.05MNewQ1 2026
3VANGUARD PORTFOLIO MANAGEMENT LLC
$357.0M
2.01MNewQ1 2026
4STATE STREET CORP
$255.7M
1.44MAddedQ1 2026
5First Trust Capital Management L.P.
$83.6M
470.2KNewQ1 2026
6Liontrust Investment Partners LLP
$81.7M
627.8KNewQ1 2026
7AQR Arbitrage LLC
$73.9M
417.0KNewQ1 2026
8VIKING GLOBAL INVESTORS LP
$66.9M
514.3KReducedQ4 2025
9Gotham Asset Management, LLC
$60.7M
341.5KReducedQ1 2026
10WESTFIELD CAPITAL MANAGEMENT CO LP
$60.7M
341.2KReducedQ1 2026
11CAPITOLIS LIQUID GLOBAL MARKETS LLC
$55.0M
309.1KNewQ1 2026
12VANGUARD FIDUCIARY TRUST CO
$51.6M
289.9KNewQ1 2026
13WHITEBOX ADVISORS LLC
$48.0M
270.0KNewQ1 2026
14Caption Management, LLC
$41.4M
232.9KNewQ1 2026
15Erste Asset Management GmbH
$35.5M
200.0KHeldQ1 2026
16READYSTATE ASSET MANAGEMENT LP
$30.4M
171.1KNewQ1 2026
17Woodline Partners LP
$27.3M
153.2KNewQ1 2026
18BANK OF NOVA SCOTIA
$27.1M
152.6KAddedQ1 2026
19TUDOR INVESTMENT CORP ET AL
$25.6M
143.9KAddedQ1 2026
20Champlain Investment Partners, LLC
$25.1M
141.3KNewQ1 2026
21Grantham, Mayo, Van Otterloo & Co. LLC
$24.5M
137.6KReducedQ1 2026
22TIG Advisors, LLC
$24.0M
135.2KNewQ1 2026
23Magnetar Financial LLC
$24.0M
135.0KAddedQ1 2026
24Schonfeld Strategic Advisors LLC
$20.9M
117.3KReducedQ1 2026
25WINTON GROUP Ltd
$20.1M
112.8KNewQ1 2026

Fund activity — latest quarter

Opened (NEW)
40
funds
Added
32
funds
Reduced
24
funds
Exited
0
funds

Insider activity (Form 4)

No Form 4 insider transactions on file yet.

Institutional ownership over time

159 funds+156 since Q2 2022
080159Q2 2022Q1 2023Q4 2023Q3 2024Q2 2025Q1 2026
funds holding aggregate valuelatest $2.4B

Funds that own MASI also own

CompanyCo-held byCombined value
Meta Platforms Inc-ClasMETA148 funds$79.5B
Nvidia Corp - USNVDA147 funds$260.1B
Amazon.com IncAMZN147 funds$127.8B
Alphabet, Inc.GOOGL147 funds$105.2B
Lilly Eli & CoLLY147 funds$49.0B
Microsoft Corp - USMSFT146 funds$175.9B
Apple Inc - USAAPL145 funds$224.6B
Broadcom LtdAVGO145 funds$91.1B
Tesla Inc - USTSLA143 funds$61.4B
Micron Technology Inc - USMU143 funds$28.8B
Boston Scientific Corp - USBSX143 funds$7.8B
Netflix Inc - USNFLX142 funds$25.7B

Ranked by how many of MASI's institutional holders also hold each name — a cross-fund conviction signal. Via the MCP server (ticker.co_held).

Recent filings

0 shown

No filings captured for this ticker in the live stream yet.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for MASI. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes. Every panel above is one call to the Arkolith API & MCP server.