CASTLE BIOSCIENCES INC (CSTL) — insider trading
Health Care · NASDAQ
CASTLE BIOSCIENCES INC (CSTL) has 225 reported SEC Form 4 insider transactions in our data, including 77 open-market sales among the most recent 100 (latest 2026-10-05).
Recent Form 4 transactions
Showing the 100 most recent of 225 recorded transactions. See all on SEC EDGAR →
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 8,165 | — | $0 | Form 4 |
| 2026-10-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,718 | $35.57 | $96.7K | Form 4 |
| 2026-10-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 3,198 | $35.57 | $113.7K | Form 4 |
| 2026-10-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 8,580 | $35.57 | $305.2K | Form 4 |
| 2026-10-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 8,165 | $2.39 | $19.5K | Form 4 |
| 2026-10-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Option exercise / conversion (derivative) | 4,153 | — | $0 | Form 4 |
| 2026-10-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 1,346 | $36.38 | $49.0K | Form 4 |
| 2026-10-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 2,807 | $35.75 | $100.4K | Form 4 |
| 2026-10-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Option exercise / conversion | 4,153 | $3.38 | $14.0K | Form 4 |
| 2026-09-30 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 1,034 | $34.20 | $35.4K | Form 4 |
| 2026-09-29 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 5,543 | $35.50 | $196.8K | Form 4 |
| 2026-09-21 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 8,580 | — | $0 | Form 4 |
| 2026-09-21 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,718 | $35.33 | $96.0K | Form 4 |
| 2026-09-21 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 3,198 | $35.33 | $113.0K | Form 4 |
| 2026-09-21 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 8,580 | $35.33 | $303.2K | Form 4 |
| 2026-09-21 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 8,580 | $2.39 | $20.5K | Form 4 |
| 2026-09-15 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 3,294 | $35.14 | $115.8K | Form 4 |
| 2026-09-14 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 3,306 | $32.32 | $106.9K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 8,584 | — | $0 | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 71 | $32.78 | $2.3K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 83 | $32.78 | $2.7K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 223 | $32.78 | $7.3K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,656 | $32.00 | $85.0K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 3,124 | $32.00 | $100.0K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 8,361 | $32.00 | $267.6K | Form 4 |
| 2026-09-11 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 8,584 | $2.39 | $20.5K | Form 4 |
| 2026-09-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Option exercise / conversion (derivative) | 4,152 | — | $0 | Form 4 |
| 2026-09-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 200 | $34.02 | $6.8K | Form 4 |
| 2026-09-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 3,952 | $33.36 | $131.8K | Form 4 |
| 2026-09-01 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Option exercise / conversion | 4,152 | $3.38 | $14.0K | Form 4 |
| 2026-08-31 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 1,730 | $32.81 | $56.8K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 12,428 | — | $0 | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 21 | $33.88 | $711 | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 21 | $33.88 | $711 | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 21 | $33.88 | $711 | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 21 | $33.88 | $711 | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 177 | $33.88 | $6.0K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 209 | $33.88 | $7.1K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 956 | $33.88 | $32.4K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 257 | $33.14 | $8.5K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 257 | $33.14 | $8.5K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 257 | $33.14 | $8.5K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 257 | $33.14 | $8.5K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,129 | $33.14 | $70.6K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,505 | $33.14 | $83.0K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 11,472 | $33.14 | $380.2K | Form 4 |
| 2026-08-28 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 12,428 | $2.39 | $29.7K | Form 4 |
| 2026-08-25 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 9,050 | $35.04 | $317.1K | Form 4 |
| 2026-08-25 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 5,223 | $34.64 | $180.9K | Form 4 |
| 2026-08-25 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 7,161 | $34.26 | $245.4K | Form 4 |
| 2026-08-24 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 12,218 | $33.69 | $411.6K | Form 4 |
| 2026-08-17 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 1,730 | $29.59 | $51.2K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 1,100 | — | $0 | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 278 | $30.02 | $8.3K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 278 | $30.02 | $8.3K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 278 | $30.02 | $8.3K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 278 | $30.02 | $8.3K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,306 | $30.02 | $69.2K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,714 | $30.02 | $81.5K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 1,100 | $30.02 | $33.0K | Form 4 |
| 2026-08-14 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 1,100 | $2.39 | $2.6K | Form 4 |
| 2026-08-14 | Stokes Frank | Officer (Chief Financial Officer) | Open-market sale | 24,908 | $29.77 | $741.5K | Form 4 |
| 2026-08-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 2,546 | — | $0 | Form 4 |
| 2026-08-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 473 | $30.68 | $14.5K | Form 4 |
| 2026-08-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 556 | $30.68 | $17.1K | Form 4 |
| 2026-08-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,546 | $30.68 | $78.1K | Form 4 |
| 2026-08-05 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 2,546 | $2.39 | $6.1K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 20,356 | — | $0 | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 4,063 | $31.34 | $127.3K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 4,782 | $31.34 | $149.8K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 11,935 | $31.34 | $374.0K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 2,866 | $30.79 | $88.2K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 3,374 | $30.79 | $103.9K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 8,421 | $30.79 | $259.3K | Form 4 |
| 2026-08-04 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 20,356 | $2.39 | $48.7K | Form 4 |
| 2026-08-03 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 1,100 | $30.62 | $33.7K | Form 4 |
| 2026-08-03 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 4,486 | $30.00 | $134.6K | Form 4 |
| 2026-08-03 | Oelschlager Kristen M | Officer (Chief Operating Officer) | Open-market sale | 3,000 | $29.12 | $87.4K | Form 4 |
| 2026-08-03 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 10,664 | — | $0 | Form 4 |
| 2026-08-03 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 3,597 | $30.35 | $109.2K | Form 4 |
| 2026-08-03 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 4,232 | $30.35 | $128.5K | Form 4 |
| 2026-08-03 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 10,664 | $30.35 | $323.7K | Form 4 |
| 2026-08-03 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 10,664 | $2.39 | $25.5K | Form 4 |
| 2026-08-03 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 1,730 | $28.25 | $48.9K | Form 4 |
| 2026-07-31 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 6,480 | — | $0 | Form 4 |
| 2026-07-31 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 1,690 | $30.15 | $51.0K | Form 4 |
| 2026-07-31 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 1,983 | $30.15 | $59.8K | Form 4 |
| 2026-07-31 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 6,480 | $30.15 | $195.4K | Form 4 |
| 2026-07-31 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion | 6,480 | $2.39 | $15.5K | Form 4 |
| 2026-07-31 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 1,891 | $30.26 | $57.2K | Form 4 |
| 2026-07-31 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 7,270 | $29.58 | $215.0K | Form 4 |
| 2026-07-31 | Juvenal Tobin W | Officer (Chief Commercial Officer) | Open-market sale | 8,149 | $28.84 | $235.0K | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Option exercise / conversion (derivative) | 6,214 | — | $0 | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 10 | $25.06 | $251 | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 10 | $25.06 | $251 | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 10 | $25.06 | $251 | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 10 | $25.06 | $251 | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 43 | $25.06 | $1.1K | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 50 | $25.06 | $1.3K | Form 4 |
| 2026-07-27 | MAETZOLD DEREK J | Director, Officer (Pres. & Chief Exec. Officer) | Open-market sale | 232 | $25.06 | $5.8K | Form 4 |
Ask the chat about CSTL's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: CASTLE BIOSCIENCES INC (CSTL).
Last updated 2026-10-05 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.