Sionna Therapeutics (SION) Institutional Ownership $25.22 +1.16 (+4.82%) As of 08/26/2025 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)30TotalInstitutional Inflows(last 12 months)$293.36MNumber ofInstitutional Sellers(last 12 months)4TotalInstitutional Outflows(last 12 months)$2.61M 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. 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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 CompanyDetails8/15/2025 Soleus Capital Management L.P.376,000$6.52M0.4%+56.7%0.852% 8/15/2025 Perceptive Advisors LLC1,216,045$21.10M1.9%-2.8%2.755% 8/15/2025 BNP Paribas Financial Markets1,761$31K0.0%N/A0.004% 8/15/2025 Braidwell LP1,081,855$18.77M0.6%N/A2.451% 8/15/2025 Bank of America Corp DE6,012$104K0.0%-31.2%0.014% 8/15/2025 Ameriprise Financial Inc.236,813$4.11M0.0%+13.2%0.537% 8/14/2025 Viking Global Investors LP3,195,181$55.44M0.2%+8.2%7.239% 8/14/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.6,747$117K0.0%N/A0.015% 8/14/2025 The Manufacturers Life Insurance Company 38,038$660K0.0%+13.4%0.086% 8/13/2025 Bosun Asset Management LLC16,975$295K0.1%N/A0.038% Get the Latest News and Ratings for SION and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Sionna Therapeutics and its competitors with MarketBeat's FREE daily newsletter. 8/13/2025 New York State Common Retirement Fund6,800$118K0.0%N/A0.015% 8/13/2025 Virtus Investment Advisers LLC5,535$96K0.0%N/A0.013% 8/12/2025 Prudential Financial Inc.135,185$2.35M0.0%+114.6%0.306% 8/12/2025 Rhumbline Advisers17,670$307K0.0%N/A0.040% 8/12/2025 JPMorgan Chase & Co.2,221,188$38.54M0.0%+2.4%5.034% 8/8/2025 Police & Firemen s Retirement System of New Jersey2,608$45K0.0%N/A0.006% 8/8/2025 Geode Capital Management LLC289,275$5.02M0.0%+113.4%0.656% 8/1/2025 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% 6/27/2025 Goldman Sachs Group Inc.63,741$667K0.0%N/A0.144% 5/23/2025 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, 32 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), Viking Global Investors LP ($55.44M), Atlas Venture Life Science Advisors LLC ($38.64M), JPMorgan Chase & Co. ($38.54M), Perceptive Advisors LLC ($21.10M), and Braidwell LP ($18.77M).Learn more on Sionna Therapeutics' institutional investors. Which institutional investors have been buying Sionna Therapeutics' stock? Of the 30 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), Braidwell LP ($1.08M), Aberdeen Group plc ($950.55K), Jennison Associates LLC ($859.93K), and Siren L.L.C. ($650K). How much institutional buying is happening at Sionna Therapeutics? Institutional investors have bought a total of 26,707,065 shares in the last 24 months. This purchase volume represents approximately $293.36M 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), Perceptive Advisors LLC ($35.06K), TD Asset Management Inc ($5.40K), and Bank of America Corp DE ($2.73K). How much institutional selling is happening at Sionna Therapeutics? Institutional investors have sold a total of 150,310 shares in the last 24 months. This volume of shares sold represents approximately $2.61M in transactions. 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