Cyclerion Therapeutics (CYCN) Institutional Ownership $2.49 +0.11 (+4.45%) Closing price 08/22/2025 03:58 PM EasternExtended Trading$2.52 +0.03 (+1.17%) As of 08/22/2025 04:11 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 AnalysisChartCompetitorsEarningsInsider TradesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Cyclerion Therapeutics (NASDAQ:CYCN)CurrentInstitutional OwnershipPercentage75.62%Number ofInstitutional Buyers(last 12 months)1TotalInstitutional Inflows(last 12 months)$34.17KNumber ofInstitutional Sellers(last 12 months)1TotalInstitutional Outflows(last 12 months)$27.91K Get CYCN Insider Trade Alerts Want to know when executives and insiders are buying or selling Cyclerion Therapeutics stock? 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Email Address Skip Chart & View Institutional Buying and Selling Data CYCN Institutional Buying and Selling by Quarter Cyclerion Therapeutics Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails8/15/2025 Tyndall Capital Partners L P155,187$452K100.0%-5.8%4.646% 2/13/2025 Renaissance Technologies LLC10,611$34K0.0%N/A0.392% 2/14/2024 Tyndall Capital Partners L P164,429$551K100.0%+11.3%6.711% 11/14/2023 Tyndall Capital Partners L P147,712$505K100.0%N/A6.129% 8/11/2023 Artal Group S.A.138,955$572K0.0%-95.0%5.766% 5/9/2022Trustcore Financial Services LLC292,645$325K0.0%+47.7%0.674% 2/14/2022 Diametric Capital LP100,480$173K0.1%+43.9%0.232% 2/10/2022 Acadian Asset Management LLC249,792$428K0.0%N/A0.577% 11/16/2021 Two Sigma Advisers LP647,700$1.99M0.0%+98.4%1.495% 11/16/2021 Two Sigma Investments LP390,596$1.20M0.0%+154.1%0.902% Get the Latest News and Ratings for CYCN and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Cyclerion Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 11/15/2021 Pura Vida Investments LLC422,311$1.30M0.0%-16.8%0.975% 11/15/2021 Eversept Partners LP371,955$1.14M0.1%N/A0.859% 11/15/2021 Franklin Resources Inc.116,035$356K0.0%N/A0.268% 11/12/2021 Jump Financial LLC52,000$160K0.0%N/A0.120% 11/12/2021 Geode Capital Management LLC490,660$1.51M0.0%+27.5%1.134% 9/17/2021 Virtu Financial LLC80,384$313K0.0%-9.2%0.186% 9/3/2021Parametric Portfolio Associates LLC12,596$49K0.0%-52.0%0.029% 8/25/2021 Marshall Wace LLP28,863$113K0.0%N/A0.067% 8/18/2021 Ikarian Capital LLC509,924$1.99M0.2%+70.0%1.178% 8/17/2021 Millennium Management LLC389,041$1.52M0.0%N/A0.899% 8/17/2021 Boothbay Fund Management LLC66,977$261K0.0%+96.3%0.155% 8/16/2021 Cubist Systematic Strategies LLC17,084$67K0.0%N/A0.039% 8/16/2021 Diametric Capital LP80,336$313K0.2%N/A0.186% 8/16/2021 Slate Path Capital LP7,157,601$27.92M1.6%+15.5%16.539% 8/16/2021 Charles Schwab Investment Management Inc.129,628$506K0.0%-35.1%0.300% 8/16/2021 State Street Corp83,321$325K0.0%-79.2%0.193% 8/16/2021Tibra Equities Europe Ltd85,000$332K0.1%N/A0.196% 8/16/2021 Goldman Sachs Group Inc.36,317$141K0.0%-9.4%0.084% 8/16/2021 Marshall Wace LLP28,863$113K0.0%N/A0.067% 8/13/2021 Renaissance Technologies LLC284,744$1.11M0.0%+22.1%0.658% 8/13/2021 Northern Trust Corp64,616$252K0.0%-73.0%0.149% 8/13/2021 Geode Capital Management LLC384,820$1.50M0.0%-21.0%0.889% 8/13/2021 Vanguard Group Inc.1,423,532$5.55M0.0%-14.7%3.289% 8/13/2021 FMR LLC2,674,811$10.43M0.0%-1.9%6.181% 8/12/2021 Prime Capital Investment Advisors LLC22,250$87K0.0%N/A0.051% 8/12/2021 XTX Topco Ltd17,968$70K0.0%+34.4%0.042% 8/12/2021 Dimensional Fund Advisors LP158,994$620K0.0%+160.1%0.367% 8/12/2021 JPMorgan Chase & Co.59,786$233K0.0%-43.7%0.138% 8/12/2021Ergoteles LLC96,100$375K0.0%N/A0.222% 8/11/2021 Bank of New York Mellon Corp66,792$260K0.0%-31.9%0.154% Washington Thinks They Own Your Bank Account (Ad)What If Washington Declared That: YOUR Money ISN'T Actually Yours? Sounds insane, but that's exactly what the Department of Justice just admitted in court—claiming cash isn't legally your property. What does that mean? It means Washington thinks they can seize, freeze, or drain your accounts—whenever they want.Get your free guide now by clicking here >>8/11/2021 Deutsche Bank AG65,900$257K0.0%-18.7%0.152% 8/11/2021 Susquehanna Fundamental Investments LLC105,572$412K0.0%N/A0.244% (Data available from 1/1/2016 forward) CYCN Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of CYCN shares? During the previous two years, the following institutional investors and hedge funds held shares of Cyclerion Therapeutics shares: Tyndall Capital Partners L P ($452K), Renaissance Technologies LLC ($34K).Learn more on Cyclerion Therapeutics' institutional investors. What percentage of Cyclerion Therapeutics' stock is owned by institutional investors? 75.62% of Cyclerion Therapeutics' stock is owned by institutional investors. Learn more on CYCN's institutional investor holdings. Which institutional investors have been buying Cyclerion Therapeutics' stock? The following institutional investors have purchased Cyclerion Therapeutics' stock in the last 24 months: Tyndall Capital Partners L P ($164.43K), and Renaissance Technologies LLC ($10.61K). How much institutional buying is happening at Cyclerion Therapeutics? Institutional investors have bought a total of 10,611 shares in the last 24 months. This purchase volume represents approximately $34.17K in transactions. Which of Cyclerion Therapeutics' major shareholders have been selling company stock? The following institutional investors have sold Cyclerion Therapeutics stock in the last 24 months: Tyndall Capital Partners L P ($9.59K). How much institutional selling is happening at Cyclerion Therapeutics? Institutional investors have sold a total of 9,590 shares in the last 24 months. This volume of shares sold represents approximately $27.91K in transactions. Related Companies CLNN Institutional Ownership ESLA Institutional Ownership KZR Institutional Ownership DYAI Institutional Ownership GBIO Institutional Ownership OKUR Institutional Ownership MURA Institutional Ownership TPST Institutional Ownership MDCX Institutional Ownership RNTX Institutional Ownership This page (NASDAQ:CYCN) was last updated on 8/23/2025 by MarketBeat.com Staff From Our PartnersBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. Economist ...Goldco Precious Metals | SponsoredGENIUS Act: Cancel Your Money?A new law called the GENIUS Act could quietly trigger the most radical shift in American finance in decades. B...Priority Gold | SponsoredAlex’s “Next Magnificent Seven” stocksThe original “Magnificent Seven” turned $7K into $1.18 million. 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