Sionna Therapeutics (SION) Institutional Ownership $14.11 +1.38 (+10.84%) As of 05/29/2025 04:00 PM Eastern Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesOwnershipSEC FilingsTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Sionna Therapeutics (NASDAQ:SION)Number ofInstitutional Buyers(last 12 months)15TotalInstitutional Inflows(last 12 months)$257.43MNumber ofInstitutional Sellers(last 12 months)0 Get SION Insider Trade Alerts Want to know when executives and insiders are buying or selling Sionna Therapeutics 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 SION Institutional Buying and Selling by Quarter Sionna Therapeutics Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails5/23/2025 Siren L.L.C.325,000$3.40M0.2%N/A0.737% 5/16/2025 Woodline Partners LP80,000$837K0.0%N/A0.181% 5/16/2025 Zimmer Partners LP237,500$2.48M0.0%N/A0.538% 5/16/2025 Goldman Sachs Group Inc.63,741$667K0.0%N/A0.144% 5/16/2025 Alyeska Investment Group L.P.186,222$1.95M0.0%N/A0.422% 5/15/2025 RA Capital Management L.P.10,445,322$109.26M1.8%N/A23.673% 5/15/2025 Baker BROS. Advisors LP400,000$4.18M0.1%N/A0.907% 5/15/2025 TPG GP A LLC6,684,962$69.93M1.4%N/A15.150% 5/15/2025 Driehaus Capital Management LLC328,889$3.44M0.0%N/A0.745% 5/15/2025 Siren L.L.C.325,000$3.40M0.2%N/A0.737% 5/14/2025 Atlas Venture Life Science Advisors LLC3,694,020$38.64M7.4%N/A8.372% 5/13/2025 Aberdeen Group plc745,964$7.80M0.0%N/A1.691% 5/9/2025 CenterBook Partners LP114,284$1.20M0.1%N/A0.259% 5/9/2025 Charles Schwab Investment Management Inc.64,644$676K0.0%N/A0.147% 5/7/2025 TD Asset Management Inc55,366$579K0.0%N/A0.125% 5/5/2025 Jennison Associates LLC859,927$9.00M0.0%N/A1.949% (Data available from 1/1/2016 forward) SION Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of SION shares? During the previous two years, 15 institutional investors and hedge funds held shares of Sionna Therapeutics. The most heavily invested institutionals were RA Capital Management L.P. ($109.26M), TPG GP A LLC ($69.93M), Atlas Venture Life Science Advisors LLC ($38.64M), Jennison Associates LLC ($9.00M), Aberdeen Group plc ($7.80M), Baker BROS. Advisors LP ($4.18M), and Driehaus Capital Management LLC ($3.44M).Learn more on SION's institutional investors. Which institutional investors have been buying Sionna Therapeutics stock? Of the 15 institutional investors that purchased Sionna Therapeutics stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: RA Capital Management L.P. ($10.45M), TPG GP A LLC ($6.68M), Atlas Venture Life Science Advisors LLC ($3.69M), Jennison Associates LLC ($859.93K), Aberdeen Group plc ($745.96K), Siren L.L.C. ($650K), and Baker BROS. Advisors LP ($400K). How much institutional buying is happening at Sionna Therapeutics? Institutional investors have bought a total of 24,610,841 shares in the last 24 months. This purchase volume represents approximately $257.43M in transactions. 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