WallStreetZenWallStreetZen

NASDAQ: SION
Sionna Therapeutics Inc Stock Ownership - Who owns Sionna Therapeutics?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Sionna Therapeutics Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Ra Capital Management LPDirector2026-09-173,415,011$6.32
$21.58MSell
Ra Capital Management LPDirector2026-09-1733,800$7.46
$252.15kSell
Orbimed Advisors LLCDirector2026-07-0785,918$44.86
$3.85MSell
Peter A. ThompsonDirector2026-07-0785,918$44.86
$3.85MSell
Jennifer FitzpatrickChief Legal Officer2026-07-0610,250$6.11
$62.63kBuy
Jennifer FitzpatrickChief Legal Officer2026-07-0610,250$43.60
$446.86kSell
Peter A. ThompsonDirector2026-06-30115,844$45.50
$5.27MSell
Orbimed Advisors LLCDirector2026-06-30115,844$45.50
$5.27MSell
Orbimed Advisors LLCDirector2026-05-27101$44.49
$4.49kSell
Peter A. ThompsonDirector2026-05-27101$44.49
$4.49kSell

1 of 9

SION insiders have sold more... subscribe to Premium to read more.
Net Insider Buy/Sell (L12M) Ownership

Be the first to know when SION insiders and whales buy or sell their stock.

SION Shareholders

What type of owners hold Sionna Therapeutics Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Tpg GP A LLC14.37%6,494,962$23.71MInsider
Peter A. Thompson13.66%6,174,918$22.54MInsider
Atlas Venture Fund XI LP8.17%3,694,020$13.48MInsider
Bruce Booth6.63%2,995,602$10.93MInsider
Orbimed Advisors LLC5.46%2,469,959$9.02MInsider
Michael Cloonan1.69%765,393$2.79MInsider
Ra Capital Management LP0.70%318,066$1.16MInsider
Elena Ridloff0.29%133,069$485.70kInsider
Charlotte McKee0.28%128,415$468.71kInsider
Jennifer Fitzpatrick0.12%56,265$205.37kInsider

1 of 3

SION vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
SION0.11%51.38%Net SellingNet Selling
PEPG0.08%9.73%Net Selling
INO0.03%30.13%Net Selling
ORMP0.04%58.05%Net SellingNet Selling
CNTN0.03%7.04%Net Selling
View Top Biotech Stocks

Sionna Therapeutics Stock Ownership FAQ

Who owns Sionna Therapeutics?

Sionna Therapeutics (NASDAQ: SION) is owned by 0.11% institutional shareholders, 51.38% Sionna Therapeutics insiders, and 48.51% retail investors. Tpg GP A LLC is the largest individual Sionna Therapeutics shareholder, owning 6.49M shares representing 14.37% of the company. Tpg GP A LLC's Sionna Therapeutics shares are currently valued at $24.23M.

If you're new to stock investing, here's how to buy Sionna Therapeutics stock.
©2026 WallStreetZen
Company
AboutNewsBlogStock Investing FAQPlansPrivacy PolicyTerms of ServiceCancellation & RefundsPerformanceHelp GuidesContactTwitterYouTubeNewsletter
Stock Tools
Top Performing AnalystsStock ScreenerStock ForecastTrending StocksStrong Buy StocksHighest Earnings StocksBest Dividend Paying StocksStatisticsStock Market SectorsStock Market IndustriesHow to Buy Stocks Online
Stock Ideas
Buy The DipBiggest Stock Gainers TodayBiggest Stock Losers Today52 Week High Stocks52 Week Low StocksMost Active Stocks TodayMost Undervalued StocksBest Penny Stocks to Buy NowBest Stocks Under $5Best Stocks Under $10
WallStreetZen does not provide financial advice and does not issue recommendations or offers to buy stock or sell any security.

Information is provided 'as-is' and solely for informational purposes and is not advice. WallStreetZen does not bear any responsibility for any losses or damage that may occur as a result of reliance on this data.