CSTL · Castle Biosciences 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 | 1,421,793 | 1,491,750 | -69,957 | 5.66 |
| 2026-06-30 | 1,491,750 | 1,485,061 | +6,689 | 3.18 |
| 2026-06-15 | 1,485,061 | 1,484,771 | +290 | 5.23 |
| 2026-05-29 | 1,484,771 | 1,415,745 | +69,026 | 3.78 |
| 2026-05-15 | 1,415,745 | 1,429,016 | -13,271 | 2.23 |
| 2026-04-30 | 1,429,016 | 1,463,047 | -34,031 | 4.73 |
| 2026-04-15 | 1,463,047 | 1,534,400 | -71,353 | 5.26 |
| 2026-03-31 | 1,534,400 | 1,429,011 | +105,389 | 4.87 |
| 2026-03-13 | 1,429,011 | 1,394,294 | +34,717 | 3.50 |
| 2026-02-27 | 1,394,294 | 1,359,050 | +35,244 | 2.89 |
| 2026-02-13 | 1,359,050 | 1,514,895 | -155,845 | 3.09 |
| 2026-01-30 | 1,514,895 | 1,532,958 | -18,063 | 4.07 |
| 2026-01-15 | 1,532,958 | 1,507,676 | +25,282 | 4.03 |
| 2025-12-31 | 1,507,676 | 1,722,466 | -214,790 | 5.28 |
| 2025-12-15 | 1,722,466 | 1,835,348 | -112,882 | 3.96 |
| 2025-11-28 | 1,835,348 | 1,641,694 | +193,654 | 3.73 |
| 2025-11-14 | 1,641,694 | 1,547,250 | +94,444 | 2.44 |
| 2025-10-31 | 1,547,250 | 1,608,069 | -60,819 | 6.42 |
| 2025-10-15 | 1,608,069 | 1,554,710 | +53,359 | 5.46 |
| 2025-09-30 | 1,554,710 | 1,795,589 | -240,879 | 4.71 |
| 2025-09-15 | 1,795,589 | 1,518,009 | +277,580 | 4.31 |
| 2025-08-29 | 1,518,009 | 1,288,459 | +229,550 | 3.25 |
| 2025-08-15 | 1,288,459 | 1,398,140 | -109,681 | 1.34 |
| 2025-07-31 | 1,398,140 | 1,412,558 | -14,418 | 3.63 |