11 insiders reported 327 Form 4 transactions for CASTLE BIOSCIENCES INC (CSTL) over the past 18 months (most recent 2026-09-23). Recent activity: MAETZOLD DEREK J (Pres. & Chief Exec. Officer) Buy 8,580 shares, MAETZOLD DEREK J (Pres. & Chief Exec. Officer) Sell 8,580 shares, MAETZOLD DEREK J (Pres. & Chief Exec. Officer) Sell 3,198 shares, MAETZOLD DEREK J (Pres. & Chief Exec. Officer) Sell 2,718 shares, Juvenal Tobin W (Chief Commercial Officer) Sell 3,306 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-23 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Buy | 8,580 | $20,506 |
| 2026-09-23 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 8,580 | $303,166 |
| 2026-09-23 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 3,198 | $112,998 |
| 2026-09-23 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 2,718 | $96,038 |
| 2026-09-16 | Juvenal Tobin W | Chief Commercial Officer | Sell | 3,306 | $106,863 |
| 2026-09-16 | Juvenal Tobin W | Chief Commercial Officer | Sell | 3,294 | $115,758 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 223 | $7,310 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 8,361 | $267,552 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 3,124 | $99,968 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 2,656 | $84,992 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Buy | 8,584 | $20,516 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 83 | $2,721 |
| 2026-09-15 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 71 | $2,327 |
| 2026-09-03 | Oelschlager Kristen M | Chief Operating Officer | Buy | 4,152 | $14,034 |
| 2026-09-03 | Oelschlager Kristen M | Chief Operating Officer | Sell | 3,952 | $131,839 |
| 2026-09-03 | Oelschlager Kristen M | Chief Operating Officer | Sell | 200 | $6,804 |
| 2026-09-02 | Juvenal Tobin W | Chief Commercial Officer | Sell | 1,730 | $56,761 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Buy | 12,428 | $29,703 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 11,472 | $380,182 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 2,505 | $83,016 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 2,129 | $70,555 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 257 | $8,517 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 257 | $8,517 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 257 | $8,517 |
| 2026-09-01 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 257 | $8,517 |
Source: SEC Form 4 filings · as of 2026-09-23