Watch CSTL. Know when insiders buy.
One email the day a filing lands. Free.
A free account adds a watchlist, alerts when insiders, Congress or short sellers move on your tickers, and a morning brief. Sign up
| Report date | Shares short | Change | % of shares out | Avg daily volume | Days to cover |
|---|---|---|---|---|---|
| 2026-08-31 | 2M | +223K | 6.47% | 391K | 5.0 |
| 2026-08-14 | 1.8M | +192K | 5.74% | 477K | 3.7 |
| 2026-07-31 | 1.6M | +140K | 5.11% | 492K | 3.2 |
| 2026-07-15 | 1.4M | −70K | 4.65% | 251K | 5.7 |