SION · Sionna Therapeutics, Inc.
Total shares sold short and not yet covered, reported to FINRA by broker-dealers twice a month. Each reading settles on the 15th and the last business day of the month and is published seven business days later — the next scheduled dates are listed at the top of the table. Days to cover divides the short position by average daily volume; a high value (above 5) can signal short-squeeze potential.
Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-07-15). Weighted mean of the available factors (short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, fails-to-deliver 10%) plus catalyst boosts (price spike, volume surge, earnings within days), capped at +20 and clamped to 100.
Short Interest History
| Settlement Date | Current Position | Previous Position | Change | Days to Cover |
|---|---|---|---|---|
|
2026-08-14
Scheduled
FINRA publishes Aug 25
|
— | — | — | — |
|
2026-07-31
Scheduled
FINRA publishes Aug 11
|
— | — | — | — |
| 2026-07-15 | 5,257,277 | 5,522,307 | -265,030 | 11.51 |
| 2026-06-30 | 5,522,307 | 4,996,300 | +526,007 | 10.14 |
| 2026-06-15 | 4,996,300 | 4,639,069 | +357,231 | 13.87 |
| 2026-05-29 | 4,639,069 | 4,740,815 | -101,746 | 14.53 |
| 2026-05-15 | 4,740,815 | 4,230,439 | +510,376 | 11.25 |
| 2026-04-30 | 4,230,439 | 3,799,971 | +430,468 | 9.29 |
| 2026-04-15 | 3,799,971 | 3,756,705 | +43,266 | 8.51 |
| 2026-03-31 | 3,756,705 | 3,544,166 | +212,539 | 11.29 |
| 2026-03-13 | 3,544,166 | 3,350,255 | +193,911 | 12.34 |
| 2026-02-27 | 3,350,255 | 3,064,857 | +285,398 | 23.36 |
| 2026-02-13 | 3,064,857 | 3,143,560 | -78,703 | 7.53 |
| 2026-01-30 | 3,143,560 | 3,053,667 | +89,893 | 13.55 |
| 2026-01-15 | 3,053,667 | 3,258,091 | -204,424 | 9.78 |
| 2025-12-31 | 3,258,091 | 2,876,610 | +381,481 | 8.47 |
| 2025-12-15 | 2,876,610 | 2,862,557 | +14,053 | 9.94 |
| 2025-11-28 | 2,862,557 | 2,973,430 | -110,873 | 10.75 |
| 2025-11-14 | 2,973,430 | 2,965,776 | +7,654 | 15.27 |
| 2025-10-31 | 2,965,776 | 3,372,058 | -406,282 | 8.13 |
| 2025-10-15 | 3,372,058 | 3,931,123 | -559,065 | 11.25 |
| 2025-09-30 | 3,931,123 | 3,771,820 | +159,303 | 11.89 |
| 2025-09-15 | 3,771,820 | 3,475,743 | +296,077 | 12.31 |
| 2025-08-29 | 3,475,743 | 3,600,368 | -124,625 | 17.59 |
| 2025-08-15 | 3,600,368 | 3,679,050 | -78,682 | 20.61 |
| 2025-07-31 | 3,679,050 | 3,530,059 | +148,991 | 25.39 |