Sionna Therapeutics (SION) Insider Trading & Ownership $27.50 +0.42 (+1.55%) As of 09/25/2025 04:00 PM Eastern Add Compare Share Share Insider Trades Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Sionna Therapeutics (NASDAQ:SION) Insider Buying and Selling ActivityCurrentInsider OwnershipPercentage3.90%Number OfInsiders Buying(Last 12 Months)1Amount OfInsider Buying(Last 12 Months)$950.40KNumber OfInsiders Selling(Last 12 Months)2Amount OfInsider Selling(Last 12 Months)$1.47M 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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SION Insider Buying and Selling by Quarter Sionna Therapeutics Insider and Congressional Trades History Insiders and Members of Congress Insiders Only Members of Congress Only Transaction Type Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 2 Years 3 Years Time Frame Start Date End Date Export to Excel Transaction DateNameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionDetails9/2/2025Elena RidloffCFOSell8,836$25.08$221,606.88 8/29/2025Elena RidloffCFOSell748$25.18$18,834.64 8/28/2025Elena RidloffCFOSell16,098$25.97$418,065.06 8/27/2025Elena RidloffCFOSell3,618$25.10$90,811.80 8/27/2025Michael CloonanCEOSell7,426$25.01$185,724.26 8/26/2025Elena RidloffCFOSell3,700$25.13$92,981.00 8/26/2025Michael CloonanCEOSell17,574$24.96$438,647.04 6/27/2025Tpg Gp A, LlcMajor ShareholderBuy60,000$15.84$950,400.00 (Data available from 1/1/2013 forward) SION Insider Trading Activity - Frequently Asked Questions Who is on Sionna Therapeutics' Insider Roster? The list of insiders at Sionna Therapeutics includes Elena Ridloff, Michael Cloonan, and Tpg Gp A, Llc. Learn more on insiders at SION. What percentage of Sionna Therapeutics stock is owned by insiders? 3.90% of Sionna Therapeutics stock is owned by insiders. Learn more on SION's insider holdings. Which Sionna Therapeutics insiders have been buying company stock? The following insider purchased SION shares in the last 24 months: Tpg Gp A, Llc ($950,400.00). How much insider buying is happening at Sionna Therapeutics? Insiders have purchased a total of 60,000 SION shares in the last 24 months for a total of $950,400.00 bought. Which Sionna Therapeutics insiders have been selling company stock? The following insiders have sold SION shares in the last 24 months: Elena Ridloff ($842,299.38), and Michael Cloonan ($624,371.30). How much insider selling is happening at Sionna Therapeutics? Insiders have sold a total of 58,000 Sionna Therapeutics shares in the last 24 months for a total of $1,466,670.68 sold. 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This page (NASDAQ:SION) was last updated on 9/26/2025 by MarketBeat.com Staff From Our PartnersNew Buy Alert: Should you put $1,000 into Oracle (ORCL) now?Barron's is calling this Oracle's "Nvidia Moment..." While the Wall Street Journal is simply calling Oracle...Chaikin Analytics | SponsoredAnother gold high? 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