CSTL short interest
Castle Biosciences Inc. · Healthcare · Medical - Diagnostics & Research · settlement date 2026-09-30
| Shares short | 1,999,726 |
|---|---|
| Change vs prior report | 100,357 (+5.3%) |
| Change over six months | +30.3% |
| Days to cover | 4.77 (sector: 3.78) |
| Average daily volume | 419,633 |
| Rank in Healthcare | #441 of 922 by days to cover |
CSTL short interest, last 12 months
| Settlement | Shares short | Change | Days to cover | Avg daily volume |
|---|---|---|---|---|
| 2026-09-30 | 1,999,726 | +5.3% | 4.77 | 419,633 |
| 2026-09-15 | 1,899,369 | -3.9% | 7.36 | 257,937 |
| 2026-08-31 | 1,976,754 | +12.7% | 5.05 | 391,437 |
| 2026-08-14 | 1,753,605 | +12.3% | 3.68 | 477,095 |
| 2026-07-31 | 1,561,988 | +9.9% | 3.17 | 491,979 |
| 2026-07-15 | 1,421,793 | -4.7% | 5.66 | 251,097 |
| 2026-06-30 | 1,491,750 | +0.5% | 3.18 | 469,005 |
| 2026-06-15 | 1,485,061 | +0.0% | 5.23 | 284,222 |
| 2026-05-29 | 1,484,771 | +4.9% | 3.78 | 393,031 |
| 2026-05-15 | 1,415,745 | -0.9% | 2.23 | 633,871 |
| 2026-04-30 | 1,429,016 | -2.3% | 4.73 | 302,361 |
| 2026-04-15 | 1,463,047 | -4.7% | 5.26 | 278,210 |
| 2026-03-31 | 1,534,400 | +7.4% | 4.87 | 314,771 |
| 2026-03-13 | 1,429,011 | +2.5% | 3.50 | 408,340 |
| 2026-02-27 | 1,394,294 | +2.6% | 2.89 | 483,116 |
| 2026-02-13 | 1,359,050 | -10.3% | 3.09 | 439,178 |
| 2026-01-30 | 1,514,895 | -1.2% | 4.07 | 372,144 |
| 2026-01-15 | 1,532,958 | +1.7% | 4.03 | 380,608 |
| 2025-12-31 | 1,507,676 | -12.5% | 5.28 | 285,598 |
| 2025-12-15 | 1,722,466 | -6.2% | 3.96 | 434,833 |
| 2025-11-28 | 1,835,348 | +11.8% | 3.73 | 492,305 |
| 2025-11-14 | 1,641,694 | +6.1% | 2.44 | 673,049 |
| 2025-10-31 | 1,547,250 | -3.8% | 6.42 | 240,965 |
| 2025-10-15 | 1,608,069 | +3.4% | 5.46 | 294,656 |
| 2025-09-30 | 1,554,710 | -13.4% | 4.71 | 330,082 |
import finzdata as yf
yf.Ticker("CSTL").short_interest # every report since 2017
yf.Client().short_interest(["CSTL"], start="2018-01-01")Healthcare short interest · CSTL price history · Who owns CSTL · All short interest