Sionna Therapeutics (SION) Institutional Ownership $16.98 -0.55 (-3.14%) As of 08/6/2025 04:00 PM Eastern Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOwnershipSEC FilingsTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Sionna Therapeutics (NASDAQ:SION)Number ofInstitutional Buyers(last 12 months)15TotalInstitutional Inflows(last 12 months)$261.65MNumber ofInstitutional Sellers(last 12 months)2TotalInstitutional Outflows(last 12 months)$1.95M 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 CompanyDetails8/1/2025 Jennison Associates LLC752,800$13.06M0.0%-12.5%1.706% 7/28/2025 TD Asset Management Inc49,966$867K0.0%-9.8%0.113% 7/24/2025 Aberdeen Group plc950,547$16.49M0.0%+27.4%2.154% 6/27/2025Goldman Sachs Group Inc.63,741$667K0.0%N/A0.144% 5/23/2025Siren L.L.C.325,000$3.40M0.2%N/A0.737% 5/16/2025Woodline Partners LP80,000$837K0.0%N/A0.181% 5/16/2025Zimmer Partners LP237,500$2.48M0.0%N/A0.538% 5/16/2025Goldman Sachs Group Inc.63,741$667K0.0%N/A0.144% 5/16/2025Alyeska Investment Group L.P.186,222$1.95M0.0%N/A0.422% 5/15/2025RA Capital Management L.P.10,445,322$109.26M1.8%N/A23.673% 5/15/2025Baker BROS. Advisors LP400,000$4.18M0.1%N/A0.907% 5/15/2025TPG GP A LLC6,684,962$69.93M1.4%N/A15.150% 5/15/2025Driehaus Capital Management LLC328,889$3.44M0.0%N/A0.745% 5/15/2025Siren L.L.C.325,000$3.40M0.2%N/A0.737% 5/14/2025Atlas 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% 5/9/2025CenterBook Partners LP114,284$1.20M0.1%N/A0.259% 5/9/2025Charles 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), Aberdeen Group plc ($16.49M), Jennison Associates LLC ($13.06M), Baker BROS. Advisors LP ($4.18M), and Driehaus Capital Management LLC ($3.44M).Learn more on Sionna Therapeutics' 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), Aberdeen Group plc ($950.55K), Jennison Associates LLC ($859.93K), 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 24,879,165 shares in the last 24 months. This purchase volume represents approximately $261.65M in transactions. Which of Sionna Therapeutics' major shareholders have been selling company stock? The following institutional investors have sold Sionna Therapeutics stock in the last 24 months: Jennison Associates LLC ($107.13K), and TD Asset Management Inc ($5.40K). How much institutional selling is happening at Sionna Therapeutics? Institutional investors have sold a total of 112,527 shares in the last 24 months. This volume of shares sold represents approximately $1.95M in transactions. Related Companies MOR Major Shareholders KYMR Major Shareholders APLS Major Shareholders IMVT Major Shareholders ALVO Major Shareholders CRNX Major Shareholders CPRX Major Shareholders RARE Major Shareholders MIRM Major Shareholders OGN Major Shareholders This page (NASDAQ:SION) was last updated on 8/7/2025 by MarketBeat.com Staff From Our PartnersMan Who Called Nvidia at $1.10 Says Buy This Now...In 2004, one man called Nvidia before just about anyone knew it existed. 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