Sonnet BioTherapeutics (SONN) Institutional Ownership $5.90 +1.94 (+48.99%) Closing price 09/12/2025 04:00 PM EasternExtended Trading$5.91 +0.01 (+0.19%) As of 09/12/2025 08:00 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 EventsHeadlinesInsider TradesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Sonnet BioTherapeutics (NASDAQ:SONN)CurrentInstitutional OwnershipPercentage9.45%Number ofInstitutional Buyers(last 12 months)3TotalInstitutional Inflows(last 12 months)$264.93KNumber ofInstitutional Sellers(last 12 months)0 Get SONN Insider Trade Alerts Want to know when executives and insiders are buying or selling Sonnet BioTherapeutics stock? 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Skip Chart & View Institutional Buying and Selling Data SONN Institutional Buying and Selling by Quarter Sonnet BioTherapeutics Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails5/12/2025MMCAP International Inc. SPC133,590$179K0.0%N/A4.357% 2/17/2025Two Sigma Investments LP19,203$28K0.0%N/A0.630% 2/11/2025Virtu Financial LLC39,647$58K0.0%N/A1.300% 8/15/2024Armistice Capital LLC272,000$255K0.0%N/A8.740% 7/27/2023Virtu Financial LLC86,624$42K0.0%N/A0.315% 5/19/2023Anson Funds Management LP1,760,000$634K0.1%N/A6.405% 11/7/2022Virtu Financial LLC26,914$40K0.0%N/A0.622% 8/2/2022Advisory Services Network LLC130,525$37K0.0%+158.3%0.215% 5/10/2022Campion Asset Management90,612$34K0.0%N/A0.150% 8/16/2021State Street Corp62,688$99K0.0%N/A0.253% 8/13/2021Vanguard Group Inc.701,634$1.11M0.0%+416.0%2.834% (Data available from 1/1/2016 forward) SONN Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of SONN shares? During the previous two years, the following institutional investors and hedge funds held shares of Sonnet BioTherapeutics shares: Armistice Capital LLC ($255K), MMCAP International Inc. SPC ($179K), and Virtu Financial LLC ($58K), Two Sigma Investments LP ($28K).Learn more on Sonnet BioTherapeutics' institutional investors. What percentage of Sonnet BioTherapeutics' stock is owned by institutional investors? 9.45% of Sonnet BioTherapeutics' stock is owned by institutional investors. Learn more on SONN's institutional investor holdings. Which institutional investors have been buying Sonnet BioTherapeutics' stock? The following institutional investors have purchased Sonnet BioTherapeutics' stock in the last 24 months: Armistice Capital LLC ($272K), MMCAP International Inc. SPC ($133.59K), Virtu Financial LLC ($39.65K), and Two Sigma Investments LP ($19.20K). How much institutional buying is happening at Sonnet BioTherapeutics? Institutional investors have bought a total of 192,440 shares in the last 24 months. This purchase volume represents approximately $264.93K in transactions. 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