As of Jul 14, 2025, Sionna Therapeutics Inc. has 3,957 shares failed to deliver, representing 2.17% of the average daily volume of 181,990 shares. Over the past year, the monthly average FTD is 14,259 shares, with the current level 72% below the historical average, indicating low settlement pressure. The weighted FTD ratio above 1% suggests potential liquidity constraints or heightened short-selling activity.