Masimo (MASI) Institutional Ownership $153.93 +0.06 (+0.04%) Closing price 04:00 PM EasternExtended Trading$153.74 -0.19 (-0.12%) As of 04:20 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Masimo (NASDAQ:MASI)CurrentInstitutional OwnershipPercentage85.96%Number ofInstitutional Buyers(last 12 months)248TotalInstitutional Inflows(last 12 months)$2.63BNumber ofInstitutional Sellers(last 12 months)166TotalInstitutional Outflows(last 12 months)$1.30B Get MASI Insider Trade Alerts Want to know when executives and insiders are buying or selling Masimo stock? 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Email Address Skip Chart & View Institutional Buying and Selling Data MASI Institutional Buying and Selling by Quarter Masimo Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails8/15/2025CANADA LIFE ASSURANCE Co26,120$4.39M0.0%-1.8%0.048% 8/15/2025Tower Research Capital LLC TRC 1,516$255K0.0%+12.3%0.003% 8/15/2025Corient Private Wealth LLC330,414$55.58M0.1%-5.1%0.608% 8/15/2025 Vident Advisory LLC1,749$294K0.0%-37.5%0.003% 8/15/2025 Tidal Investments LLC106,198$17.87M0.1%-3.9%0.195% 8/15/2025 Smartleaf Asset Management LLC170$29K0.0%-34.1%0.000% 8/15/2025 Onex Canada Asset Management Inc.8,224$1.38M0.2%-52.9%0.015% 8/15/2025 Orion Porfolio Solutions LLC4,871$819K0.0%+2.2%0.009% 8/15/2025 Holocene Advisors LP1,243,607$209.20M0.5%-6.7%2.289% 8/15/2025 Engineers Gate Manager LP6,873$1.16M0.0%-11.4%0.013% Get the Latest News and Ratings for MASI and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Masimo and its competitors with MarketBeat's FREE daily newsletter. 8/15/2025 BNP Paribas Financial Markets4,483$754K0.0%-93.7%0.008% 8/15/2025 Brevan Howard Capital Management LP3,486$586K0.0%-78.2%0.006% 8/15/2025 Bellevue Group AG89,673$15.09M0.3%+28.5%0.165% 8/15/2025 Birchview Capital LP8,280$1.39M1.4%-26.6%0.015% 8/15/2025 Bamco Inc. NY384,589$64.70M0.2%+21.2%0.708% 8/15/2025 Bank of America Corp DE190,176$31.99M0.0%-39.9%0.350% 8/15/2025 4D Advisors LLC45,000$7.57M4.1%+50.0%0.083% 8/15/2025 AQR Capital Management LLC50,256$8.45M0.0%+517.2%0.093% 8/15/2025 Ameriprise Financial Inc.394,487$66.36M0.0%+86.3%0.726% 8/14/2025 Alamea Verwaltungs GmbH2,566$432K0.3%+30.7%0.005% 8/14/2025 Viking Global Investors LP767,426$129.10M0.4%N/A1.413% 8/14/2025 Durable Capital Partners LP1,163,898$195.79M1.5%+3.4%2.142% 8/14/2025 California State Teachers Retirement System43,353$7.29M0.0%+0.2%0.080% 8/14/2025 Raymond James Financial Inc.200,229$33.68M0.0%-2.9%0.369% 8/14/2025 Occudo Quantitative Strategies LP2,115$356K0.0%N/A0.004% 8/14/2025 Quantinno Capital Management LP120,383$20.25M0.1%+88.9%0.222% 8/14/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.11,062$1.86M0.0%-2.7%0.020% 8/14/2025 Alliancebernstein L.P.844,067$141.99M0.0%-2.5%1.554% 8/14/2025 Treasurer of the State of North Carolina21,053$3.54M0.0%+6.0%0.039% 8/14/2025 The Manufacturers Life Insurance Company 58,714$9.88M0.0%+8.9%0.108% 8/14/2025 Squarepoint Ops LLC74,027$12.45M0.0%+344.1%0.136% 8/14/2025 Sei Investments Co.30,506$5.13M0.0%-0.8%0.056% 8/14/2025 State Street Corp1,486,394$250.04M0.0%+0.7%2.736% 8/14/2025 WINTON GROUP Ltd5,617$945K0.0%N/A0.010% 8/14/2025 Natixis45,648$7.68M0.0%N/A0.084% 8/14/2025 Bank of Nova Scotia53,108$8.93M0.0%-43.0%0.098% 8/14/2025 California Public Employees Retirement System72,807$12.25M0.0%+4.2%0.134% 8/14/2025 Federated Hermes Inc.4,201$707K0.0%-91.8%0.008% 8/13/2025 Gabelli Funds LLC32,700$5.50M0.0%-0.9%0.060% 8/13/2025 Tema Etfs LLC3,949$664K0.2%-13.1%0.007% Top Picks for Trump’s Pro-Crypto America (Ad)27 industry leaders share urgent market intel (free access)... For a very limited time, you can claim your spot for FREE.Click here to reserve your free seat at the Crypto Community Summit8/13/2025 Knollwood Investment Advisory LLC1,200$202K0.0%N/A0.002% 8/13/2025 Amundi41,583$7.13M0.0%+1.0%0.077% 8/13/2025 Marshall Wace LLP7,208$1.21M0.0%-34.3%0.013% 8/13/2025 Alpha Wave Global LP102,068$17.17M1.9%N/A0.188% 8/13/2025 Walleye Capital LLC43,232$7.27M0.0%-43.2%0.080% 8/13/2025 Baird Financial Group Inc.40,720$6.85M0.0%-9.8%0.075% 8/13/2025 First Trust Advisors LP99,612$16.76M0.0%-31.4%0.183% 8/13/2025 Guggenheim Capital LLC5,673$954K0.0%-10.7%0.010% 8/13/2025 Invesco Ltd.237,303$39.92M0.0%-9.2%0.437% 8/13/2025 Quantbot Technologies LP509$86K0.0%N/A0.001% 8/13/2025 M&T Bank Corp2,759$464K0.0%+26.3%0.005% 8/13/2025 BLI Banque de Luxembourg Investments86,700$14.58M0.4%-14.3%0.160% 8/13/2025 Schroder Investment Management Group448,501$75.45M0.1%+3.0%0.826% 8/13/2025 Norges Bank39,053$6.57M0.0%N/A0.072% 8/13/2025 Grantham Mayo Van Otterloo & Co. LLC240,563$40.47M0.1%N/A0.443% 8/13/2025 State Board of Administration of Florida Retirement System43,319$7.29M0.0%+1.3%0.080% 8/13/2025 Quadrant Capital Group LLC4,981$838K0.0%+23.0%0.009% 8/13/2025 Choreo LLC1,835$309K0.0%+28.1%0.003% 8/13/2025 Russell Investments Group Ltd.10,935$1.84M0.0%-68.5%0.020% 8/12/2025 Advisors Asset Management Inc.24,383$4.10M0.1%-10.6%0.045% 8/12/2025 XTX Topco Ltd10,837$1.82M0.1%N/A0.020% 8/12/2025 Prudential Financial Inc.3,872$651K0.0%+21.4%0.007% 8/12/2025 American Century Companies Inc.152,228$25.61M0.0%+92.3%0.280% 8/12/2025 Rhumbline Advisers127,496$21.45M0.0%+3.8%0.235% 8/12/2025 Franklin Resources Inc.4,902$825K0.0%-60.1%0.009% 8/12/2025 Legal & General Group Plc104,364$17.56M0.0%+4.8%0.192% 8/12/2025 MAI Capital Management202$34K0.0%+176.7%0.000% 8/12/2025 JPMorgan Chase & Co.138,090$23.23M0.0%-44.0%0.254% 8/12/2025 Entropy Technologies LP8,000$1.35M0.1%+343.7%0.015% 8/12/2025 Swiss National Bank87,700$14.75M0.0%-0.6%0.161% 8/12/2025 Handelsbanken Fonder AB12,330$2.07M0.0%-4.6%0.023% 8/12/2025 Westfield Capital Management Co. LP1,181,203$198.70M0.8%+75.9%2.174% 8/12/2025 Ensign Peak Advisors Inc15,976$2.69M0.0%+5.6%0.029% 8/11/2025 Bridger Management LLC33,641$5.66M3.3%-14.4%0.062% 8/11/2025 Universal Beteiligungs und Servicegesellschaft mbH6,640$1.12M0.0%+3.7%0.012% 8/8/2025 Intech Investment Management LLC31,750$5.34M0.1%-2.3%0.059% 8/8/2025 SG Americas Securities LLC14,766$2.48M0.0%+809.8%0.027% 8/8/2025 Commonwealth of Pennsylvania Public School Empls Retrmt SYS11,562$1.95M0.0%+8.8%0.021% 8/8/2025 Massachusetts Financial Services Co. MA2,470,393$415.57M0.1%+25.5%4.556% 8/8/2025 Calamos Advisors LLC5,617$945K0.0%-76.0%0.010% 8/8/2025 Police & Firemen s Retirement System of New Jersey16,943$2.85M0.0%+7.7%0.031% 8/8/2025 Geode Capital Management LLC896,418$150.82M0.0%+6.2%1.653% 8/8/2025 PNC Financial Services Group Inc.6,398$1.08M0.0%+12.6%0.012% 8/8/2025 KBC Group NV1,258$212K0.0%-40.2%0.002% 8/7/2025 Allworth Financial LP387$65K0.0%+72.8%0.001% 8/7/2025 ProShare Advisors LLC1,995$336K0.0%+5.3%0.004% 8/7/2025 Mitsubishi UFJ Asset Management Co. Ltd.4,319$727K0.0%+6.9%0.008% 8/6/2025 Summit Investment Advisors Inc.8,744$1.46M1.2%-1.8%0.016% 8/6/2025 Vestmark Advisory Solutions Inc.4,250$715K0.0%+29.8%0.008% 8/6/2025 Malaga Cove Capital LLC2,826$475K0.2%-2.8%0.005% Top Picks for Trump’s Pro-Crypto America (Ad)27 industry leaders share urgent market intel (free access)... For a very limited time, you can claim your spot for FREE.Click here to reserve your free seat at the Crypto Community Summit8/6/2025 Eukles Asset Management4,853$816K0.3%-5.1%0.009% 8/5/2025 Bryce Point Capital LLC4,885$822K0.7%N/A0.009% 8/5/2025 Bank of New York Mellon Corp317,593$53.43M0.0%-4.4%0.586% 8/5/2025 Bank of Montreal Can5,563$936K0.0%-9.2%0.010% 8/5/2025 Montanaro Asset Management Ltd22,860$3.85M1.0%-29.2%0.042% 8/5/2025 State of Michigan Retirement System10,796$1.82M0.0%+1.9%0.020% 8/4/2025 Simon Quick Advisors LLC2,267$381K0.0%N/A0.004% 8/4/2025 Strs Ohio55,983$9.42M0.0%+39.5%0.103% 8/4/2025 Amalgamated Bank21,743$3.66M0.0%+5.2%0.040% 8/4/2025 Atria Investments Inc1,928$324K0.0%-8.9%0.004% (Data available from 1/1/2016 forward) MASI Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of MASI shares? During the previous two years, 402 institutional investors and hedge funds held shares of Masimo. The most heavily invested institutionals were FMR LLC ($1.34B), Vanguard Group Inc. ($763.57M), Massachusetts Financial Services Co. MA ($415.57M), Capital Research Global Investors ($405.81M), T. Rowe Price Investment Management Inc. ($278.76M), State Street Corp ($250.04M), and Holocene Advisors LP ($209.20M).Learn more on Masimo's institutional investors. What percentage of Masimo's stock is owned by institutional investors? 85.96% of Masimo's stock is owned by institutional investors. Learn more on MASI's institutional investor holdings. Which institutional investors have been buying Masimo's stock? Of the 323 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: Massachusetts Financial Services Co. MA ($3.36M), FMR LLC ($3.31M), Capital Research Global Investors ($1.23M), Durable Capital Partners LP ($1.16M), Eminence Capital LP ($1.04M), Westfield Capital Management Co. LP ($986.89K), and Alliancebernstein L.P. ($878.59K). How much institutional buying is happening at Masimo? Institutional investors have bought a total of 16,405,401 shares in the last 24 months. This purchase volume represents approximately $2.63B in transactions. Which of Masimo's major shareholders have been selling company stock? Of the 166 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: Thrivent Financial for Lutherans ($1.21M), Ace Management Global Ltd. ($1.01M), Farallon Capital Management LLC ($861.56K), RTW Investments LP ($779.11K), JPMorgan Chase & Co. ($409.91K), Man Group plc ($335.06K), and Two Sigma Investments LP ($302.94K). How much institutional selling is happening at Masimo? Institutional investors have sold a total of 8,202,737 shares in the last 24 months. This volume of shares sold represents approximately $1.30B in transactions. 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