Frank Stokes is CFO at CASTLE BIOSCIENCES INC (CSTL). They have made 7 open-market trades across 1 company since 2020, most recently 2026-08-14.
CIK 0001782815
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 7 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CSTL | 35,177 | $1.1M |
Shares reported on the most recent Form 4, priced at the 2026-08-18 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| CSTL | SELL | 2026-08-14 | 2026-08-18 | $29.77 | $742K | +13.8% | +24.8% | — |
| CSTL | SELL · 10b5-1 | 2026-03-05 | 2026-03-09 | $27.98 | $168K | -4.6% | -6.5% | -25.2% |
| CSTL | SELL | 2026-03-03 | 2026-03-05 | $27.44 | $192K | -4.9% | -9.2% | -25.0% |
| CSTL | SELL | 2025-12-11 | 2025-12-15 | $37.45 | $337K | +2.4% | +6.0% | -32.8% |
| CSTL | SELL · 10b5-1 | 2025-11-11 | 2025-11-13 | $35.08 | $378K | +20.9% | +17.7% | -2.1% |
| CSTL | SELL · 10b5-1 | 2025-02-20 | 2025-02-24 | $26.70 | $430K | -17.9% | -20.0% | -37.0% |
| CSTL | SELL · 10b5-1 | 2024-11-15 | 2024-11-19 | $29.90 | $390K | +9.0% | -5.9% | -7.2% |
| CSTL | SELL · 10b5-1 | 2024-08-07 | 2024-08-13 | $25.70 | $257K | +6.0% | +10.0% | +21.1% |
| CSTL | SELL | 2021-06-15 | 2021-06-17 | $73.03 | $1.3M | +0.2% | -13.1% | +0.3% |
| CSTL | SELL | 2020-11-12 | 2020-11-16 | $50.86 | $2.6M | -13.0% | +32.4% | +82.4% |
| CSTL | SELL | 2020-10-13 | 2020-10-15 | $54.51 | $1.4M | +0.8% | -1.5% | +43.4% |
| CSTL | SELL | 2020-09-14 | 2020-09-16 | $49.37 | $1.9M | +5.3% | +5.2% | +28.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.