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Masimo (MASI) Institutional Ownership

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$178.58 +0.37 (+0.21%)
Closing price 04:00 PM Eastern
Extended Trading
$178.53 -0.05 (-0.03%)
As of 04:23 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 Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Masimo (NASDAQ:MASI)

Current
Institutional Ownership
Percentage
85.96%
Number of
Institutional Buyers
(last 12 months)
270
Total
Institutional Inflows
(last 12 months)
$2.33B
Number of
Institutional Sellers
(last 12 months)
181
Total
Institutional Outflows
(last 12 months)
$1.35B
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MASI Institutional Buying and Selling by Quarter

Masimo Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
5/5/2026Bank of New York Mellon Corp306,400$54.50M0.0%-0.7%0.570%
5/5/2026Illinois Municipal Retirement Fund7,626$1.36M0.0%-32.9%0.014%
5/4/2026ABC Arbitrage SA23,604$4.20M0.6%N/A0.044%
5/4/2026Calamos Wealth Management LLC1,511$269K0.0%N/A0.003%
5/4/2026Calamos Advisors LLC1,511$269K0.0%N/A0.003%
5/4/2026State of Michigan Retirement System10,996$1.96M0.0%+1.9%0.020%
5/4/2026Principal 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%
4/30/2026 Hsbc 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%
3/9/2026Corient Private Wealth LLC340,230$44.25M0.1%+1.2%0.633%
3/3/2026Caitong 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%
2/19/2026Corient Private Wealth LLC341,730$44.45M0.0%+1.6%0.636%
2/18/2026Mercer 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%
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%
2/18/2026nVerses 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%
2/18/2026Millennium Management LLC187,965$24.45M0.0%+1,065.2%0.350%
2/18/2026Man Group plc147,416$19.17M0.0%N/A0.274%
2/18/2026Gotham Asset Management LLC342,194$44.51M0.2%+165.2%0.637%
2/18/2026Engineers Gate Manager LP83,458$10.86M0.1%+171.2%0.155%
2/18/2026Cinctive Capital Management LP5,681$739K0.0%N/A0.011%
2/18/2026Bamco Inc. NY373,899$48.63M0.1%-3.8%0.696%
2/17/2026Viking Global Investors LP514,340$66.90M0.2%-52.1%0.958%
2/17/2026Schonfeld Strategic Advisors LLC265,036$34.47M0.2%+2,335.1%0.493%
2/17/2026AQR Capital Management LLC1,091,326$141.94M0.1%+3,416.5%2.032%
2/17/2026DF Dent & Co. Inc.142,626$18.55M0.3%+31.3%0.266%
2/17/2026Laird Norton Wetherby Trust Company LLC4,778$621K0.0%N/A0.009%
2/17/2026Trexquant Investment LP13,920$1.81M0.0%N/A0.026%
2/17/2026Amundi43,860$5.70M0.0%-48.3%0.082%
2/17/2026iSAM Funds UK Ltd1,762$229K0.1%+152.1%0.003%
2/17/2026Jump Financial LLC12,953$1.69M0.0%N/A0.024%
2/17/2026Price T Rowe Associates Inc. MD213,594$27.78M0.0%-58.5%0.398%
2/17/2026T. Rowe Price Investment Management Inc.600,293$78.08M0.1%-71.8%1.118%
2/17/2026Public Employees Retirement System of Ohio13,879$1.81M0.0%-3.6%0.026%
2/17/2026California State Teachers Retirement System43,823$5.70M0.0%+1.1%0.082%
2/17/2026Russell Investments Group Ltd.4,633$603K0.0%-5.2%0.009%
2/17/2026State of Wisconsin Investment Board19,490$2.54M0.0%-10.3%0.036%
2/17/2026Captrust Financial Advisors3,852$501K0.0%N/A0.007%
2/17/2026ExodusPoint Capital Management LP9,385$1.22M0.0%N/A0.017%
2/17/2026Royal Bank of Canada11,340$1.47M0.0%-91.1%0.021%
2/17/2026Graham Capital Management L.P.6,017$783K0.0%+4.3%0.011%
2/17/2026Magnetar Financial LLC5,455$709K0.0%N/A0.010%
2/17/2026Rothschild Wealth LLC1,747$227K0.0%N/A0.003%
2/17/2026Aster Capital Management DIFC Ltd216$28K0.0%N/A0.000%
2/16/2026Sofinnova Investments Inc.46,201$6.01M0.2%N/A0.086%
2/16/2026Squarepoint Ops LLC583,747$75.92M0.1%-6.0%1.087%
2/16/2026Vanguard Personalized Indexing Management LLC7,523$978K0.0%+10.7%0.014%
2/16/2026Verition Fund Management LLC53,020$6.90M0.0%+463.9%0.099%
2/16/2026Mariner LLC21,449$2.79M0.0%N/A0.040%
2/16/2026DE Burlo Group Inc.7,952$1.03M0.1%-1.2%0.015%
2/16/2026Barclays PLC58,358$7.59M0.0%-25.0%0.109%
2/16/2026Brown Advisory Inc.14,854$1.93M0.0%-4.4%0.028%
2/16/2026Aigen Investment Management LP2,018$262K0.1%N/A0.004%
2/13/2026FORA Capital LLC5,174$673K0.1%+42.8%0.010%
2/13/2026Marshall Wace LLP219,312$28.52M0.0%+63.5%0.408%
2/13/2026The Manufacturers Life Insurance Company 33,184$4.32M0.0%-3.0%0.062%
2/13/2026CANADA LIFE ASSURANCE Co26,610$3.46M0.0%-1.9%0.050%
2/13/2026Alpha Wave Global LP75,552$9.83M1.2%-22.2%0.141%
2/13/2026Walleye Capital LLC42,049$5.47M0.0%-52.9%0.078%
2/13/2026Onex Canada Asset Management Inc.25,805$3.36M0.5%-7.6%0.048%
2/13/2026Bridgewater Associates LP1,619$211K0.0%-5.5%0.003%


MASI Institutional Ownership - Frequently Asked Questions

Who are the largest shareholders of MASI shares?

During the previous two years, 430 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.

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 367 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).

How much institutional buying is happening at Masimo?

Institutional investors have bought a total of 15,514,647 shares in the last 24 months. This purchase volume represents approximately $2.33B in transactions.

Which of Masimo's major shareholders have been selling company stock?

Of the 181 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. ($893.83K), Viking Global Investors LP ($559.09K), Durable Capital Partners LP ($543.28K), Vanguard Group Inc. ($464.65K), and Sumitomo Mitsui Trust Group Inc. ($456.47K).

How much institutional selling is happening at Masimo?

Institutional investors have sold a total of 9,608,287 shares in the last 24 months. This volume of shares sold represents approximately $1.35B in transactions.


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This page (NASDAQ:MASI) was last updated on 5/5/2026 by MarketBeat.com Staff.
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