CSTL · Insider Trading
Castle Biosciences, Inc. Common Stock
Every open-market purchase and sale reported by CSTL officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-10-01 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-09-23 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-09-16 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-09-15 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-09-03 | Kristen M Oelschlager | Chief Operating Officer | MIXED | — | — |
| 2026-09-02 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-09-01 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-08-27 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-08-26 | Kristen M Oelschlager | Chief Operating Officer | Sell | — | — |
| 2026-08-19 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-08-18 | Frank Stokes | Chief Financial Officer | Sell | — | — |
| 2026-08-18 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-08-06 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-08-06 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-08-06 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-08-06 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-08-05 | Kristen M Oelschlager | Chief Operating Officer | Sell | — | — |
| 2026-08-04 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| 2026-08-04 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-07-29 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-07-16 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-07-06 | Kristen M Oelschlager | Chief Operating Officer | Sell | — | — |
| 2026-07-06 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-06-18 | Kristen M Oelschlager | Chief Operating Officer | Sell | — | — |
| 2026-06-17 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-06-03 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-06-01 | DANIEL BRADBURY | Director | A | — | — |
| 2026-06-01 | Rodney Cotton | Director | A | — | — |
| 2026-06-01 | G Bradley Cole | Director | A | — | — |
| 2026-06-01 | Ellen Goldberg | Director | A | — | — |
| 2026-06-01 | Miles Harrison | Director | A | — | — |
| 2026-06-01 | Kim Caple | Director | A | — | — |
| 2026-06-01 | Tiffany Olson | Director | A | — | — |
| 2026-05-27 | Kim Caple | Director | M | — | — |
| 2026-05-27 | Ellen Goldberg | Director | M | — | — |
| 2026-05-27 | Tiffany Olson | Director | M | — | — |
| 2026-05-27 | Miles Harrison | Director | M | — | — |
| 2026-05-27 | DANIEL BRADBURY | Director | M | — | — |
| 2026-05-27 | G Bradley Cole | Director | M | — | — |
| 2026-05-27 | Rodney Cotton | Director | M | — | — |
| 2026-05-26 | Tobin W Juvenal | Chief Commercial Officer | M | — | — |
| 2026-05-22 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-05-11 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-04-23 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-04-08 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-03-30 | Rodney Cotton | Director | M | — | — |
| 2026-03-30 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | MIXED | — | — |
| 2026-03-19 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | Sell | — | — |
| 2026-03-17 | DEREK J MAETZOLD | Pres. & Chief Exec. Officer | Sell | — | — |
| 2026-03-16 | Tobin W Juvenal | Chief Commercial Officer | Sell | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 1,676,061 | — |
| — | 10%+ Owner | 1,533,577 | — |
| — | 10%+ Owner | 1,496,855 | — |
| — | 10%+ Owner | 1,433,577 | — |
| — | Director | 503,577 | — |
| — | Director | 125,124 | — |
| — | 10%+ Owner | 115,300 | — |
| — | 10%+ Owner | 115,300 | — |
| — | Chief Operating Officer | 90,157 | — |
| — | Chief Commercial Officer | 64,108 | — |
| — | Pres. & Chief Exec. Officer | 62,414 | — |
| — | Director | 45,362 | — |
| — | Director | 44,139 | — |
| — | Director | 40,921 | — |
| — | Director | 39,573 | — |
| — | Director | 36,121 | — |
| — | Director | 35,631 | — |
| — | Director | 35,631 | — |
| — | Chief Financial Officer | 35,177 | — |
| — | Director | 32,998 | — |
| — | Director | 32,976 | — |
| — | Chief Medical Officer | 31,459 | — |
| — | Chief Business Officer | 14,696 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the CSTL quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.