As of April 22, 2026, Castle Biosciences's top three insider holders are Derek J Maetzold (Pres. Chief Exec. Officer, 122.97K shares), Kristen M Oelschlager (Chief Operating Officer, 100.94K shares), Kristen M Oelschlager (Chief Operating Officer, 100.94K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Derek J Maetzold | Pres. Chief Exec. Officer | 21,479 | 101,492 | 08 Apr, 2026 |
| Kristen M Oelschlager | Chief Operating Officer | 0 | 100,937 | 04 Nov, 2025 |
| Kristen M Oelschlager | Chief Operating Officer | 0 | 100,937 | 04 Nov, 2025 |
| Tobin W Juvenal | Chief Commercial Officer | 86,825 | 0 | 16 Mar, 2026 |
| Tobin W Juvenal | Chief Commercial Officer | 86,825 | 0 | 16 Mar, 2026 |
| Frank Stokes | Chief Financial Officer | 60,085 | 0 | 09 Mar, 2026 |
| Frank Stokes | Chief Financial Officer | 60,085 | 0 | 09 Mar, 2026 |
| Mara G. Aspinall | - | 44,139 | 0 | 04 Jun, 2024 |
| Kristen M Oelschlager | Chief Operating Officer | 39,047 | 0 | 05 Mar, 2025 |
| Kristen M Oelschlager | Chief Operating Officer | 39,047 | 0 | 05 Mar, 2025 |
| Ellen Goldberg | - | 27,254 | 0 | 23 May, 2025 |
| Ellen Goldberg | - | 27,254 | 0 | 23 May, 2025 |
| Tiffany Olson | - | 25,906 | 0 | 23 May, 2025 |
| Tiffany Olson | - | 25,906 | 0 | 23 May, 2025 |
| Kim Caple | - | 22,454 | 0 | 23 May, 2025 |
| Kim Caple | - | 22,454 | 0 | 23 May, 2025 |
| Miles Harrison | - | 21,964 | 0 | 23 May, 2025 |
| Miles Harrison | - | 21,964 | 0 | 23 May, 2025 |
| Rodney Cotton | - | 19,331 | 0 | 30 Mar, 2026 |
| Rodney Cotton | - | 19,331 | 0 | 30 Mar, 2026 |
| Bernhard E. Spiess | Chief Business Officer | 14,696 | 0 | 14 Dec, 2021 |
| Bernhard E. Spiess | Chief Business Officer | 14,696 | 0 | 14 Dec, 2021 |
| Daniel Bradbury | - | 8,673 | 0 | 23 May, 2025 |
| Daniel Bradbury | - | 0 | 5,700 | 05 Dec, 2024 |
| Tobin W Juvenal | Chief Commercial Officer | 0 | 2,230 | 28 Apr, 2022 |
| Tobin W Juvenal | Chief Commercial Officer | 0 | 2,230 | 28 Apr, 2022 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | A | 6,214 | $2.39 | 27,693 | D | M |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 6,214 | $25.03 | 21,479 | D | S |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 1,357 | $25.03 | 48,852 | I | S |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 1,153 | $25.03 | 41,520 | I | S |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.03 | 2,780 | I | S |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.03 | 2,780 | I | S |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.03 | 2,780 | I | S |
| 06 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.03 | 2,780 | I | S |
| 06 Apr, 2026 | Derek J Maetzold | Stock option (right to buy) | D | 6,214 | $0.00 | 7,518 | D | M |
| 26 Mar, 2026 | Rodney Cotton | Common Stock | A | 5,329 | - | 19,331 | D | M |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | A | 550 | $2.39 | 22,029 | D | M |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 550 | $25.55 | 21,479 | D | S |
| 26 Mar, 2026 | Rodney Cotton | Restricted Stock Units | D | 5,329 | $0.00 | 5,330 | D | M |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 1,357 | $25.55 | 50,209 | I | S |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 1,153 | $25.55 | 42,673 | I | S |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.55 | 3,058 | I | S |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.55 | 3,058 | I | S |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.55 | 3,058 | I | S |
| 26 Mar, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.55 | 3,058 | I | S |
| 26 Mar, 2026 | Derek J Maetzold | Stock option (right to buy) | D | 550 | $0.00 | 13,732 | D | M |