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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 LPDirector2025-10-2817,118$39.58
$677.53kSell
Ra Capital Management LPDirector2025-10-2831,392$39.58
$1.24MSell
Ra Capital Management LPDirector2025-10-283,624$39.58
$143.44kSell
Ra Capital Management LPDirector2025-10-2810,476$39.58
$414.64kSell
Ra Capital Management LPDirector2025-10-2466,672$39.50
$2.63MSell
Ra Capital Management LPDirector2025-10-24122,271$39.50
$4.83MSell
Ra Capital Management LPDirector2025-10-2414,116$39.50
$557.58kSell
Ra Capital Management LPDirector2025-10-24107,941$39.50
$4.26MSell
Michael CloonanPresident CEO2025-10-2113,324$6.11
$81.41kBuy
Bruce BoothDirector2025-10-2117$36.42
$619.14Sell

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Net Insider Buy/Sell (L12M) Ownership

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SION Shareholders

What type of owners hold Sionna Therapeutics Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Ra Capital Management LP23.66%10,445,322$412.07MInstitution
Tpg GP A LLC15.28%6,744,962$266.09MInstitution
Tpg GP A LLC15.28%6,744,962$266.09MInsider
Peter A. Thompson8.39%3,704,959$146.16MInsider
Orbimed Advisors LLC8.39%3,704,959$146.16MInstitution
Orbimed Advisors LLC8.39%3,704,959$146.16MInsider
Atlas Venture Life Science Advisors LLC8.37%3,694,020$145.73MInstitution
Atlas Venture Fund XI LP8.37%3,694,020$145.73MInsider
Viking Global Investors LP7.24%3,195,181$126.05MInstitution
Bruce Booth6.79%2,995,602$118.18MInsider

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SION vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
SION66.72%33.28%Net BuyingNet Selling
IMCR95.69%4.31%Net BuyingNet Buying
JANX63.40%36.60%Net Buying
ABCL36.06%44.65%Net Buying
HRMY77.54%22.46%Net SellingNet Selling
View Top Biotech Stocks

Sionna Therapeutics Stock Ownership FAQ

Who owns Sionna Therapeutics?

Sionna Therapeutics (NASDAQ: SION) is owned by 98.43% institutional shareholders, 49.09% Sionna Therapeutics insiders, and 0.00% retail investors. Tpg GP A LLC is the largest individual Sionna Therapeutics shareholder, owning 6.74M shares representing 15.28% of the company. Tpg GP A LLC's Sionna Therapeutics shares are currently valued at $253.07M.

If you're new to stock investing, here's how to buy Sionna Therapeutics stock.
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