SION NASDAQ

Of US companies ranked in the riskiest tenth, about 1 in 20 filed for bankruptcy within a year (2020-2025).
If the stock fell to about $0.07 (down 98%), Sionna Therapeutics, Inc. would be worth roughly what it owes.
Total debt $8.1M against a stock market value of $166.6M.
Distance to default 0.24 (Merton model): prices to 2026-10-26, balance sheet 2026-06-30, debt counted $4.0M (short-term plus half of long-term), stock volatility 255.6%; Altman Z'' 14.89. A ranking and a back-test, not a forecast.
US fund filings (SEC N-PORT) show under $25M of this company's bonds, so there is no bond page. Its debt may be bank loans or privately placed. How these are computed.