SION
Sionna Therapeutics, Inc. Common Stock
stockNASDAQ
At CloseOct 2, 2026 3:59:59 PM EDT
4.93USD-3.048%(-0.16)1,159,021
Pre-marketOct 2, 2026 9:28:30 AM EDT
5.17USD+1.672%(+0.09)
After-hoursOct 2, 2026 4:13:30 PM EDT
4.98USD+1.014%(+0.05)
As of 2026-09-15, there were 3,966,138 shares short with a short interest of 14.90%.
SION Short Interest - Official
Short Interest
SION Short Position Change - Official
Short Position Change
SION Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | 14.90 | 3,966,138 | 3.10 | -332,527 | -7.74 | 45,212,399 | 26,609,572 |
| 2026-08-31 | 16.15 | 4,298,665 | 2.62 | +50,831 | +1.20 | 45,212,399 | 26,609,572 |
| 2026-08-14 | 15.96 | 4,247,834 | 1.00 | +49,440 | +1.18 | 45,212,399 | 26,609,572 |
| 2026-07-31 | 15.78 | 4,198,394 | 6.79 | -1,058,883 | -20.14 | 45,150,330 | 26,609,572 |
| 2026-07-15 | 19.76 | 5,257,277 | 11.51 | -265,030 | -4.80 | 45,150,330 | 26,609,572 |
| 2026-06-30 | 20.91 | 5,522,307 | 10.14 | +526,007 | +10.53 | 45,150,330 | 26,407,795 |
| 2026-06-15 | 18.92 | 4,996,300 | 13.87 | +255,485 | +5.39 | 45,150,330 | 26,407,795 |
| 2026-05-15 | 18.33 | 4,740,815 | 11.25 | +510,376 | +12.06 | 45,150,330 | 25,860,167 |
| 2026-04-30 | 17.13 | 4,230,439 | 9.29 | +430,468 | +11.33 | 45,142,330 | 24,693,643 |
| 2026-04-15 | 15.39 | 3,799,971 | 8.51 | +43,266 | +1.15 | 44,998,073 | 24,693,643 |
| 2026-03-31 | 15.21 | 3,756,705 | 11.29 | +212,539 | +6.00 | 44,998,073 | 24,693,643 |
| 2026-03-13 | 14.35 | 3,544,166 | 12.34 | +193,911 | +5.79 | 44,998,073 | 24,693,643 |
| 2026-02-27 | 13.57 | 3,350,255 | 23.36 | +285,398 | +9.31 | 44,628,788 | 24,693,643 |
| 2026-02-13 | 12.41 | 3,064,857 | 7.53 | -78,703 | -2.50 | 44,628,788 | 24,693,643 |
| 2026-01-30 | 12.73 | 3,143,560 | 13.55 | +89,893 | +2.94 | 44,628,788 | 24,693,643 |
| 2026-01-15 | 12.37 | 3,053,667 | 9.78 | -204,424 | -6.27 | 44,628,788 | 24,693,643 |
| 2025-12-31 | 13.19 | 3,258,091 | 8.47 | +381,481 | +13.26 | 44,628,788 | 24,693,643 |
| 2025-12-15 | 11.65 | 2,876,610 | 9.94 | +14,053 | +0.49 | 44,628,788 | 24,693,643 |
| 2025-11-28 | 11.75 | 2,862,557 | 10.75 | -110,873 | -3.73 | 44,628,788 | 24,363,569 |
| 2025-11-14 | 12.20 | 2,973,430 | 15.27 | +7,654 | +0.26 | 44,628,788 | 24,363,568 |
| 2025-10-31 | 12.31 | 2,965,776 | 8.13 | -406,282 | -12.05 | 44,139,823 | 24,096,636 |
| 2025-10-15 | 14.33 | 3,372,058 | 11.25 | -559,065 | -14.22 | 44,139,823 | 23,526,437 |
Historical data is split-adjusted.
1 Data from Finra. Finra publishes an updated file every two weeks.
2 Days to Cover (DTC) is also called Short Ratio. This is the Short Position / Average Daily Trading Volume.