Sionna Therapeutics (SION) Institutional Ownership $18.49 -0.04 (-0.22%) As of 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)$258.10MNumber 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 CompanyDetails6/27/2025Goldman 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% 5/13/2025Aberdeen 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% 5/7/2025TD Asset Management Inc55,366$579K0.0%N/A0.125% 5/5/2025Jennison 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 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), 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 24,674,582 shares in the last 24 months. This purchase volume represents approximately $258.10M in transactions. Related Companies ACAD Major Shareholders SRRK Major Shareholders SWTX Major Shareholders VKTX Major Shareholders PTGX Major Shareholders MLTX Major Shareholders CRNX Major Shareholders IMVT Major Shareholders KYMR Major Shareholders MOR Major Shareholders This page (NASDAQ:SION) was last updated on 7/16/2025 by MarketBeat.com Staff From Our PartnersMarket Panic: Trump Just Dropped a Bomb on Your Stockstock Market Panic: Trump Just Dropped a Bomb on Your Stocks The market is in freefall—and Trump's new tarif...American Alternative | Sponsored"Death Spiral" Threatening Your SavingsThe "Death Spiral" Threatening Your Savings But this time, it's not just Dalio ringing the alarm bells…GoldCo Precious Metals | SponsoredINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | SponsoredThe Trump Dump is starting; Get out of stocks now?The first 365 days of the Trump presidency… Will be the best time to get rich in American history.Paradigm Press | SponsoredSpecial gold investment soars 2,300% ... 5,090% ... 9,850%In my 54 years as an investor, I’ve seen my share of gold bull markets. 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