Derek J. Maetzold is President at CASTLE BIOSCIENCES INC (CSTL). They have made 81 open-market trades across 1 company since 2020, most recently 2026-09-21.
CIK 0001239501
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 81 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CSTL | 9,550 | $305K |
| ENCY | 122,895 | — |
| Total | $305K |
Shares reported on the most recent Form 4, priced at the 2026-09-23 close. 1 holding could not be priced and is excluded from the total.
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 · 10b5-1 | 2026-09-21 | 2026-09-23 | $35.33 | $512K | +5.6% | — | — |
| CSTL | SELL · 10b5-1 | 2026-09-11 | 2026-09-15 | $32.02 | $465K | -1.8% | -7.4% | — |
| CSTL | SELL · 10b5-1 | 2026-08-28 | 2026-09-01 | $33.20 | $588K | -1.0% | +4.2% | — |
| CSTL | SELL · 10b5-1 | 2026-08-14 | 2026-08-18 | $30.02 | $192K | +13.8% | +24.8% | — |
| CSTL | SELL · 10b5-1 | 2026-08-04 | 2026-08-06 | $31.07 | $1.2M | -7.9% | +3.8% | — |
| CSTL | SELL · 10b5-1 | 2026-07-31 | 2026-08-04 | $30.28 | $867K | -3.5% | +6.4% | — |
| CSTL | SELL · 10b5-1 | 2026-07-27 | 2026-07-29 | $24.16 | $218K | +30.1% | +35.1% | — |
| CSTL | SELL · 10b5-1 | 2026-07-14 | 2026-07-16 | $22.92 | $77K | -0.8% | +24.3% | +37.3% |
| CSTL | SELL · 10b5-1 | 2026-07-01 | 2026-07-06 | $24.29 | $219K | +0.6% | +26.0% | +52.1% |
| CSTL | SELL · 10b5-1 | 2026-06-15 | 2026-06-17 | $20.66 | $69K | +15.8% | +17.3% | +72.6% |
| CSTL | SELL · 10b5-1 | 2026-06-01 | 2026-06-03 | $20.86 | $188K | -1.6% | +15.5% | +59.6% |
| CSTL | SELL · 10b5-1 | 2026-05-20 | 2026-05-22 | $20.15 | $67K | +8.5% | +6.7% | +65.0% |
| CSTL | SELL · 10b5-1 | 2026-05-07 | 2026-05-11 | $22.15 | $199K | +6.8% | +9.7% | +68.2% |
| CSTL | SELL · 10b5-1 | 2026-04-21 | 2026-04-23 | $25.10 | $84K | +4.4% | -16.7% | +5.3% |
| CSTL | SELL · 10b5-1 | 2026-04-06 | 2026-04-08 | $25.03 | $225K | +1.3% | -20.1% | -3.9% |
| CSTL | SELL · 10b5-1 | 2026-03-26 | 2026-03-30 | $25.55 | $171K | -3.1% | +1.8% | +2.1% |
| CSTL | SELL · 10b5-1 | 2026-03-17 | 2026-03-19 | $25.91 | $500K | -4.4% | -2.1% | -21.0% |
| CSTL | SELL · 10b5-1 | 2026-03-13 | 2026-03-17 | $25.74 | $1.6M | -7.7% | -3.7% | -19.1% |
| CSTL | SELL | 2026-03-11 | 2026-03-13 | $25.67 | $1.1M | -2.1% | -8.8% | -18.7% |
| CSTL | SELL · 10b5-1 | 2026-02-03 | 2026-02-05 | $39.52 | $159K | +2.1% | -18.1% | -25.0% |
| CSTL | SELL · 10b5-1 | 2026-01-20 | 2026-01-22 | $40.01 | $161K | -7.2% | -31.0% | -40.2% |
| CSTL | SELL · 10b5-1 | 2026-01-05 | 2026-01-07 | $38.76 | $156K | +0.6% | -19.4% | -38.9% |
| CSTL | SELL · 10b5-1 | 2025-12-22 | 2025-12-29 | $40.35 | $33K | -0.1% | +0.3% | -40.2% |
| CSTL | SELL · 10b5-1 | 2025-12-17 | 2025-12-19 | $40.04 | $20K | -3.6% | +2.1% | -35.8% |
| CSTL | SELL · 10b5-1 | 2025-12-15 | 2025-12-17 | $38.68 | $2.5M | -1.1% | +0.7% | -34.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.