American Shared Hospital Services (AMS) Institutional Ownership $2.52 -0.10 (-3.82%) As of 03:42 PM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Ownership Stock AnalysisChartHeadlinesOwnershipSEC FilingsShort InterestBuy This Stock Institutional Ownership Changes (13F Filings) for American Shared Hospital Services (NYSEAMERICAN:AMS)CurrentInstitutional OwnershipPercentage23.16%Number ofInstitutional Buyers(last 12 months)1Number ofInstitutional Sellers(last 12 months)0 Get AMS Insider Trade Alerts Want to know when executives and insiders are buying or selling American Shared Hospital Services stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. Email Address Skip Chart & View Institutional Buying and Selling Data AMS Institutional Buying and Selling by Quarter American Shared Hospital Services Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails2/13/2025 Renaissance Technologies LLC71,225$227K0.0%+5.6%1.109% 8/9/2024 Renaissance Technologies LLC55,501$177K0.0%+31.2%0.877% 8/9/2024 Dimensional Fund Advisors LP179,637$574K0.0%+4.9%2.838% 5/10/2024 Acadian Asset Management LLC86,399$254K0.0%-38.7%1.365% 5/7/2024 Empowered Funds LLC10,468$31K0.0%N/A0.165% 10/11/2023 Canton Hathaway LLC20,000$49K0.0%-33.3%0.321% 8/7/2023 Acadian Asset Management LLC140,864$358K0.0%-5.7%2.268% 4/11/2023 Canton Hathaway LLC30,000$84K0.0%+50.0%0.488% 1/19/2023 Canton Hathaway LLC20,000$59K0.0%+100.0%0.325% 10/17/2022 Canton Hathaway LLC10,000$26K0.0%N/A0.164% 8/2/2022 Financial Counselors Inc.37,123$82K0.0%N/A0.611% 11/16/2021 Squarepoint Ops LLC27,453$76K0.0%-13.9%0.468% 8/17/2021 Bridgeway Capital Management LLC220,800$647K0.0%+47.0%3.806% 8/16/2021 Squarepoint Ops LLC31,871$93K0.0%N/A0.549% 8/13/2021 Vanguard Group Inc.104,644$307K0.0%+126.6%1.804% 8/12/2021 Dimensional Fund Advisors LP220,839$647K0.0%-9.8%3.807% 8/11/2021 Susquehanna Fundamental Investments LLC10,600$31K0.0%N/A0.183% 7/31/2021 GWM Advisors LLC31,595$93K0.0%+46.3%0.545% 5/21/2021 Citadel Advisors LLC27,220$75K0.0%+164.3%0.469% (Data available from 1/1/2016 forward) AMS Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of AMS shares? During the previous two years, the following institutional investors and hedge funds held shares of American Shared Hospital Services shares: Dimensional Fund Advisors LP ($574K), Acadian Asset Management LLC ($254K), Renaissance Technologies LLC ($227K), and Canton Hathaway LLC ($49K), Empowered Funds LLC ($31K).Learn more on American Shared Hospital Services' institutional investors. What percentage of American Shared Hospital Services' stock is owned by institutional investors? 23.16% of American Shared Hospital Services' stock is owned by institutional investors. Learn more on AMS's institutional investor holdings. Which institutional investors have been buying American Shared Hospital Services' stock? The following institutional investors have purchased American Shared Hospital Services' stock in the last 24 months: Renaissance Technologies LLC ($16.98K), Empowered Funds LLC ($10.47K), and Dimensional Fund Advisors LP ($8.44K). How much institutional buying is happening at American Shared Hospital Services? Institutional investors have bought a total of 3,776 shares in the last 24 months. This purchase volume represents approximately $0.00 in transactions. Related Companies Biodesix Major Shareholders P3 Health Partners Major Shareholders Cryo-Cell International Major Shareholders Mangoceuticals Major Shareholders SunLink Health Systems Major Shareholders ATI Physical Therapy Major Shareholders Ontrak Major Shareholders NewGenIvf Group Major Shareholders Natera Major Shareholders This page (NYSEAMERICAN:AMS) was last updated on 8/18/2025 by MarketBeat.com Staff From Our PartnersWhen the levee breaksThe U.S. Treasury just confirmed it plans to borrow $1.01 trillion this quarter—nearly double what was project...Porter & Company | Sponsored"AI Upgrade" Coming Sept. 1stA new “AI Upgrade” is rolling out on September 1st—and tech leaders are calling it transformational. 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