Sionna Therapeutics, Inc. Comm | SION | Nasdaq | Latest report: February 27, 2026
At the latest settlement date of February 27, 2026, Sionna Therapeutics, Inc. Comm (SION) showed reported short interest of 3,350,255 shares. That compared with 3,064,857 shares in the prior report, a change of 285.4K shares, or +9.3%. The latest reported days to cover was 23.36, based on average daily volume of 143.4K.
The historical data currently tracked for SION includes 24 reported entries from February 14, 2025 to February 27, 2026. During that span, reported short interest ranged between 630.7K and 3.8M shares.
Extreme edge-case readings may reflect unusually low reported average volume.
| Settlement Date | Short Interest | Prior Short Interest | Change Shares | Change % | Average Daily Volume | Days to Cover |
|---|---|---|---|---|---|---|
| February 27, 2026 | 3,350,255 | 3,064,857 | 285.4K | +9.3% | 143.4K | 23.36 |
| February 13, 2026 | 3,064,857 | 3,143,560 | -78.7K | -2.5% | 407.2K | 7.53 |
| January 30, 2026 | 3,143,560 | 3,053,667 | 89.9K | +2.9% | 231.9K | 13.55 |
| January 15, 2026 | 3,053,667 | 3,258,091 | -204.4K | -6.3% | 312.3K | 9.78 |
| December 31, 2025 | 3,258,091 | 2,876,610 | 381.5K | +13.3% | 384.5K | 8.47 |
| December 15, 2025 | 2,876,610 | 2,862,557 | 14.1K | +0.5% | 289.4K | 9.94 |
| November 28, 2025 | 2,862,557 | 2,973,430 | -110.9K | -3.7% | 266.3K | 10.75 |
| November 14, 2025 | 2,973,430 | 2,965,776 | 7.7K | +0.3% | 194.7K | 15.27 |
| October 31, 2025 | 2,965,776 | 3,372,058 | -406.3K | -12.1% | 364.6K | 8.13 |
| October 15, 2025 | 3,372,058 | 3,931,123 | -559.1K | -14.2% | 299.6K | 11.25 |
| September 15, 2025 | 3,771,820 | 3,475,743 | 296.1K | +8.5% | 306.3K | 12.31 |
| August 29, 2025 | 3,475,743 | 3,600,368 | -124.6K | -3.5% | 197.6K | 17.59 |
| August 15, 2025 | 3,600,368 | 3,679,050 | -78.7K | -2.1% | 174.7K | 20.61 |
| July 31, 2025 | 3,679,050 | 3,530,059 | 149.0K | +4.2% | 144.9K | 25.39 |
| July 15, 2025 | 3,530,059 | 3,631,953 | -101.9K | -2.8% | 159.5K | 22.13 |
| June 30, 2025 | 3,631,953 | 2,827,394 | 804.6K | +28.5% | 355.4K | 10.22 |
| June 13, 2025 | 2,827,394 | 2,871,885 | -44.5K | -1.6% | 138.6K | 20.41 |
| May 30, 2025 | 2,871,885 | 2,587,312 | 284.6K | +11.0% | 117.8K | 24.39 |
| May 15, 2025 | 2,587,312 | 2,502,341 | 85.0K | +3.4% | 173.9K | 14.88 |
| April 30, 2025 | 2,502,341 | 2,291,588 | 210.8K | +9.2% | 108.1K | 23.14 |
| April 15, 2025 | 2,291,588 | 2,280,720 | 10.9K | +0.5% | 180.5K | 12.69 |
| March 31, 2025 | 2,280,720 | 1,739,754 | 541.0K | +31.1% | 272.2K | 8.38 |
| February 28, 2025 | 1,329,000 | 630,656 | 698.3K | +110.7% | 199.9K | 6.65 |
| February 14, 2025 | 630,656 | 0 | 630.7K | +100.0% | 301.4K | 2.09 |