CASTLE BIOSCIENCES INC (CSTL) has 236 open-market insider trades by 20 insiders since 2006. Over the last six months insiders net sold $1.6M. The most active filer is Derek J. Maetzold, President.
| Name | Title | Tier | Trades | Value | Last Trade |
|---|---|---|---|---|---|
| Derek J. Maetzold | Pres | — | 81 | $66.7M | 2026-09-21 |
| David S. Kabakoff | Dir | — | 21 | $65.4M | 2021-06-17 |
| Joseph C. Cook III | Dir | — | 26 | $58.0M | 2021-03-18 |
| Daniel Bradbury | Dir | — | 55 | $32.0M | 2026-05-22 |
| Garheng Kong | — | — | 3 | $10.4M | 2020-05-12 |
| Bernhard E. Spiess | — | — | 7 | $9.8M | 2021-09-02 |
| Sofinnova HealthQuest Partners, L.P. | 10% Owner | — | 1 | $8.6M | 2020-05-12 |
| Frank Stokes | CFO | — | 7 | $6.3M | 2026-08-14 |
| MGC Venture Partners 2013 GP, LLC | 10% Owner | — | 1 | $4.0M | 2019-07-29 |
| Kristen M. Oelschlager | COO | — | 4 | $3.5M | 2026-10-01 |
| Insider | Title | Type | Value | Date |
|---|---|---|---|---|
| Tobin W. Juvenal | CCO | Sell | $111K | 2026-10-12 |
| Derek J. Maetzold | President | Sell | $516K | 2026-10-05 |
| Kristen M. Oelschlager | COO | Sell | $149K | 2026-10-01 |
| Tobin W. Juvenal | CCO | Sell | $232K | 2026-09-29 |
| Derek J. Maetzold | President | Sell | $512K | 2026-09-21 |
| Tobin W. Juvenal | CCO | Sell | $223K | 2026-09-14 |
Companies that share insiders with CSTL, and sector peers with recent insider buying. Related by who files, not by how the stocks move.
| Derek J. Maetzold | President | Sell | $465K | 2026-09-11 |
| Kristen M. Oelschlager | COO | Sell | $139K | 2026-09-01 |
| Tobin W. Juvenal | CCO | Sell | $57K | 2026-08-31 |
| Derek J. Maetzold | President | Sell | $588K | 2026-08-28 |
| Tobin W. Juvenal | CCO | Sell | $317K | 2026-08-25 |
| Kristen M. Oelschlager | COO | Sell | $838K | 2026-08-24 |
| Tobin W. Juvenal | CCO | Sell | $51K | 2026-08-17 |
| Derek J. Maetzold | President | Sell | $192K | 2026-08-14 |
| Frank Stokes | CFO | Sell | $742K | 2026-08-14 |