Go Pro
→ The world’s least risky AI stock? (From Stansberry Research) (Ad)tc pixel Free MASI Stock Alerts

This company has been marked as potentially delisted and may not be actively trading.

Masimo (MASI) Institutional Ownership

Masimo logo
Compare

Institutional Ownership Changes (13F Filings) for Masimo (NASDAQ:MASI)

Current
Institutional Ownership
Percentage
85.96%
Number of
Institutional Buyers
(last 12 months)
233
Total
Institutional Inflows
(last 12 months)
$1.82B
Number of
Institutional Sellers
(last 12 months)
144
Total
Institutional Outflows
(last 12 months)
$1.29B
Get MASI Insider Trade Alerts

Want to know when executives and insiders are buying or selling Masimo stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily.

Subscribe Now
SMS is currently available in Australia, Belgium, Canada, France, Germany, Ireland, Italy, New Zealand, the Netherlands, Singapore, South Africa, Spain, Switzerland, the United Kingdom, and the United States. By entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy.
Skip Chart & View Institutional Buying and Selling Data

MASI Institutional Buying and Selling by Quarter

Masimo Major Shareholders & Ownership History

Export
Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
6/24/2026Redwood Investment Management LLC5,835$1.04M0.1%-30.8%0.011%
6/18/2026Pacer Advisors Inc.7,618$1.36M0.0%+3.5%0.015%
6/16/2026Empowered Funds LLC1,376$245K0.0%-14.2%0.003%
6/15/2026Carmignac Gestion64,831$11.53M0.2%N/A0.124%
6/3/2026 NewEdge Advisors LLC1,827$325K0.0%+1,531.3%0.003%
6/1/2026Caerus Investment Advisors LLC1,526$271K0.1%N/A0.003%
6/1/2026Keel Point LLC1,228$218K0.0%N/A0.002%
5/21/2026 Essential Partners LLC1,183$210K0.1%+33.4%0.002%
5/21/2026Groupe la Francaise31,950$5.68M0.1%N/A0.061%
5/20/2026Liontrust Investment Partners LLP20,138$3.58M0.1%-96.8%0.038%
5/19/2026Western Wealth Management LLC250$44K0.0%N/A0.000%
5/19/2026Bank of America Corp DE232,003$41.27M0.0%-18.5%0.443%
5/19/2026 Bull Harbor Capital LLC2,151$383K0.1%N/A0.004%
5/19/2026 South Dakota Investment Council17,568$3.13M0.1%-17.4%0.034%
5/18/2026 Amundi243,143$43.25M0.0%+454.4%0.464%
5/18/2026 EverSource Wealth Advisors LLC1,064$189K0.0%+9.0%0.002%
5/18/2026California State Teachers Retirement System53,287$9.48M0.0%+21.6%0.102%
5/18/2026Readystate Asset Management LP171,115$30.44M1.4%N/A0.327%
5/18/2026Royal Bank of Canada2,748$489K0.0%-75.8%0.005%
5/18/2026Empowered Funds LLC1,376$245K0.0%-14.2%0.003%
5/16/2026The Manufacturers Life Insurance Company 23,637$4.20M0.0%-28.8%0.045%
5/16/2026Quantinno Capital Management LP22,501$4.00M0.0%+69.8%0.043%
5/16/2026Whitebox Advisors LLC270,001$48.03M0.6%N/A0.516%
5/16/2026SummitTX Capital L.P.7,000$1.25M0.0%+336.7%0.013%
5/15/2026Weiss Asset Management LP112,600$20.03M0.3%N/A0.215%
5/15/2026Waverly Advisors LLC1,415$252K0.0%N/A0.003%
5/15/2026Kryger Capital LLC100,589$17.89M1.3%N/A0.192%
5/14/2026Healthcare of Ontario Pension Plan Trust Fund67,600$12.02M0.0%N/A0.129%
5/14/2026Renaissance Technologies LLC239,500$42.60M0.1%+299.8%0.457%
5/14/2026 Gabelli Funds LLC126,082$22.43M0.2%+285.6%0.241%
5/14/2026 GABELLI & Co INVESTMENT ADVISERS INC.88,650$15.77M2.3%N/A0.169%
5/14/2026 Gamco Investors INC. ET AL92,000$16.36M0.2%+10.8%0.176%
5/14/2026Public Employees Retirement System of Ohio13,446$2.39M0.0%-3.1%0.026%
5/14/2026Arrowstreet Capital Limited Partnership172,588$30.70M0.0%N/A0.330%
5/14/2026Caxton Associates LLP45,917$8.17M0.2%N/A0.088%
5/14/2026Capula Management Ltd142,800$25.40M0.2%N/A0.273%
5/14/2026 Bank of Nova Scotia152,584$27.14M0.0%+2,808.0%0.291%
5/14/2026Sei Investments Co.13,195$2.35M0.0%+71.0%0.025%
5/8/2026 PNC Financial Services Group Inc.5,107$908K0.0%-29.9%0.010%
5/7/2026 Dimensional Fund Advisors LP164,402$29.24M0.0%-5.5%0.315%
Here’s the stock symbol I’ve promised (Ad)

Whitney Tilson of Stansberry Research has long recommended Berkshire Hathaway as a core retirement holding - but now he believes he's found something better. This under-the-radar company sits at the intersection of America's two most important industries, including AI, pays massive dividends, and attracted a famous money manager who put 60% of his multi-billion-dollar fund into it. Tilson is revealing the name and ticker symbol completely free - no credit card or email required.tc pixel

Get the stock name and ticker symbol free of charge today
5/7/2026 Parallel Advisors LLC624$111K0.0%+119.7%0.001%
5/7/2026 Swiss National Bank90,300$16.06M0.0%-0.9%0.173%
5/6/2026California Public Employees Retirement System77,397$13.77M0.0%+22.2%0.148%
5/6/2026 Assetmark Inc.2,068$368K0.0%+11.8%0.004%
5/6/2026 Bessemer Group Inc.1,857$331K0.0%+1,217.0%0.004%
5/5/2026 Bank of New York Mellon Corp306,400$54.50M0.0%-0.7%0.570%
5/5/2026 Illinois Municipal Retirement Fund7,626$1.36M0.0%-32.9%0.014%
5/4/2026 ABC Arbitrage SA23,604$4.20M0.6%N/A0.044%
5/4/2026 Calamos Wealth Management LLC1,511$269K0.0%N/A0.003%
5/4/2026 Calamos Advisors LLC1,511$269K0.0%N/A0.003%
5/4/2026 State of Michigan Retirement System10,996$1.96M0.0%+1.9%0.020%
5/4/2026 Principal Financial Group Inc.102,718$18.27M0.0%+5.0%0.191%
5/1/2026 180 Wealth Advisors LLC2,728$485K0.1%+2.5%0.005%
5/1/2026 Commonwealth of Pennsylvania Public School Empls Retrmt SYS18,940$3.37M0.0%+65.8%0.035%
5/1/2026 Fifth Third Bancorp11,736$2.09M0.0%+1,934.0%0.022%
4/30/2026Hsbc Holdings PLC473,434$84.27M0.0%N/A0.881%
4/30/2026 Oregon Public Employees Retirement Fund9,374$1.67M0.0%+3.3%0.017%
4/29/2026 R Squared Ltd1,289$229K0.1%N/A0.002%
4/29/2026 Credit Industriel ET Commercial23,050$4.10M0.3%N/A0.043%
4/29/2026 Canvas Wealth Advisors LLC3,191$568K0.1%N/A0.006%
4/28/2026 Hardy Reed LLC2,381$424K0.0%+9.6%0.004%
4/28/2026 Praxis Investment Management Inc.1,773$315K0.0%N/A0.003%
4/27/2026 HB Wealth Management LLC2,704$481K0.0%+15.7%0.005%
4/27/2026 New York State Teachers Retirement System38,569$6.86M0.0%-3.7%0.072%
4/25/2026 Strs Ohio37,213$6.62M0.0%+0.8%0.069%
4/24/2026 Root Financial Partners LLC457$81K0.0%+7,516.7%0.001%
4/24/2026 Capricorn Fund Managers Ltd22,811$4.06M0.6%N/A0.042%
4/22/2026 Pictet Asset Management Holding SA7,020$1.25M0.0%+7.3%0.013%
4/22/2026 Sterling Capital Management LLC322$57K0.0%-97.0%0.001%
4/22/2026 Ground Swell Capital LLC1,319$235K0.5%N/A0.002%
4/21/2026 Pinnacle Wealth Management Advisory Group LLC1,324$236K0.0%N/A0.002%
4/21/2026 Louisiana State Employees Retirement System13,200$2.35M0.0%N/A0.025%
4/21/2026 Silver Oak Securities Incorporated1,755$312K0.0%-10.2%0.003%
4/20/2026 Blue Trust Inc.232$41K0.0%-24.2%0.000%
4/20/2026 Fifth Third Wealth Advisors LLC1,528$272K0.0%N/A0.003%
4/17/2026 Krilogy Financial LLC1,879$335K0.0%-44.1%0.003%
4/17/2026 Andina Capital Management LLC1,420$253K0.2%N/A0.003%
4/16/2026 SG Americas Securities LLC522,824$93.00M0.1%+3,082.3%0.973%
4/16/2026 Evolve Private Wealth LLC1,713$305K0.0%N/A0.003%
4/16/2026 Diversified Trust Co4,685$833K0.0%N/A0.009%
3/17/2026Rockefeller Capital Management L.P.86,411$11.24M0.0%-41.4%0.161%
3/9/2026 Corient Private Wealth LLC340,230$44.25M0.1%+1.2%0.633%
3/3/2026 Caitong International Asset Management Co. Ltd890$116K0.0%N/A0.002%
2/24/2026Pacer Advisors Inc.7,360$957K0.0%+21.1%0.014%
2/23/2026Virtu Financial LLC1,985$258K0.0%N/A0.004%
2/19/2026T. Rowe Price Investment Management Inc.2,330,158$303.06M0.2%+9.6%4.338%
2/19/2026Invesco Ltd.319,308$41.53M0.0%-0.6%0.595%
2/19/2026 Corient Private Wealth LLC341,730$44.45M0.0%+1.6%0.636%
2/18/2026 Mercer Global Advisors Inc. ADV10,862$1.41M0.0%N/A0.020%
2/18/2026Naya Capital Management UK Ltd.1,560,697$202.98M15.3%N/A2.906%
The options guide that actually starts at the beginning (Ad)

Most options educators jump straight into Greeks, spreads, and implied volatility - losing beginners before they ever place a trade. This free guide from Base Camp Trading takes a different approach, starting with the basics and showing you exactly how options work, why traders use them, and how they fit into a simple trading plan.tc pixel

Claim your free options guide and start building real trading knowledge
2/18/2026State of Tennessee Department of Treasury13,918$1.91M0.0%-4.1%0.026%
2/18/2026Empowered Funds LLC1,603$208K0.0%-34.9%0.003%
2/18/2026XTX Topco Ltd12,746$1.66M0.0%N/A0.024%
2/18/2026 nVerses Capital LLC2,067$269K0.6%N/A0.004%
2/18/2026Voloridge Investment Management LLC39,557$5.15M0.0%+1,281.7%0.074%
2/18/2026Wellington Management Group LLP7,832$1.02M0.0%+257.0%0.015%
2/18/2026SummitTX Capital L.P.1,603$208K0.0%N/A0.003%
2/18/2026Tudor Investment Corp ET AL16,242$2.11M0.0%-48.7%0.030%
2/18/2026Polymer Capital Management US LLC9,523$1.24M0.1%+62.1%0.018%
2/18/2026Occudo Quantitative Strategies LP9,663$1.26M0.1%+87.7%0.018%


MASI Institutional Ownership - Frequently Asked Questions

During the previous two years, 434 institutional investors and hedge funds held shares of Masimo. The most heavily invested institutionals were FMR LLC ($1.34B), Politan Capital Management LP ($677.20M), Vanguard Group Inc. ($565.60M), Massachusetts Financial Services Co. MA ($346.46M), T. Rowe Price Investment Management Inc. ($303.06M), Holocene Advisors LP ($209.20M), and Naya Capital Management UK Ltd. ($202.98M).Learn more on Masimo's institutional investors.

85.96% of Masimo's stock is owned by institutional investors. Learn more on MASI's institutional investor holdings.

Of the 374 institutional investors that purchased Masimo's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: FMR LLC ($3.31M), Massachusetts Financial Services Co. MA ($1.94M), Naya Capital Management UK Ltd. ($1.56M), Durable Capital Partners LP ($1.16M), Westfield Capital Management Co. LP ($1.11M), AQR Capital Management LLC ($1.11M), and Capital Research Global Investors ($1.09M).

Institutional investors have bought a total of 12,369,886 shares in the last 24 months. This purchase volume represents approximately $1.82B in transactions.

Of the 142 institutional investors that sold Masimo's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: T. Rowe Price Investment Management Inc. ($1.53M), Capital Research Global Investors ($1.22M), Alliancebernstein L.P. ($790.51K), Liontrust Investment Partners LLP ($646.86K), Viking Global Investors LP ($559.09K), Durable Capital Partners LP ($543.28K), and Vanguard Group Inc. ($461.23K).

Institutional investors have sold a total of 9,226,324 shares in the last 24 months. This volume of shares sold represents approximately $1.29B in transactions.


Related Companies

Institutional ownership data for NASDAQ:MASI is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 6/24/2026. New 13F filings are added each quarter as they're published.
From Our Partners
The options guide that actually starts at the beginning
Most options educators jump straight into Greeks, spreads, and implied volatility - losing beginners before th...
Base Camp Trading | Sponsoredtc pixel
Here’s the stock symbol I’ve promised
Whitney Tilson of Stansberry Research has long recommended Berkshire Hathaway as a core retirement holding - b...
Stansberry Research | Sponsoredtc pixel
Man who Predicted Trump 2016 Win: “Prepare for Mid-Term Meltdown”
In 2016, major election models gave Hillary Clinton a 99% chance of winning - but former CIA and Pentagon advi...
Paradigm Press | Sponsoredtc pixel
Trump’s New Currency Reset
Trump is launching a new $250 bill - but that may be a distraction. Behind the scenes, Executive Order 14241 i...
Porter & Company | Sponsoredtc pixel
Your book attached
Bill Poulos is giving away his 'Safe Trade Options Formula' book for free - but only for a limited time throug...
Profits Run | Sponsoredtc pixel
The REAL Reason Trump is Invading Iran
For a moment… Forget about Trump’s ties to Israel. Forget about reports of Iran’s nuclear program. Be...
Banyan Hill Publishing | Sponsoredtc pixel
Wall Street is staring at the wrong AI trade
Anthropic just signed a 9.1 billion dollar, 20 year data center agreement covering 191 megawatts of capacity, ...
The Oxford Club | Sponsoredtc pixel
Why I'm sending this one to my own family
Behind the Markets editor Kelly Maguire says she has never sent an email quite like this one. A sealed congres...
Behind the Markets | Sponsoredtc pixel