Castle Biosciences's top three insider shareholders as of June 06, 2026 are Derek J Maetzold (Pres. Chief Exec. Officer, 119.35K shares), Kristen M Oelschlager (Chief Operating Officer, 100.94K shares), Tobin W Juvenal (Chief Commercial Officer, 86.83K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Daniel Bradbury | - | 8,673 | 0 | 23 May, 2025 |
| Derek J Maetzold | Pres. Chief Exec. Officer | 21,479 | 97,870 | 23 Apr, 2026 |
| G Bradley Cole | - | 19,309 | 0 | 09 Mar, 2026 |
| Tiffany Olson | - | 25,906 | 0 | 23 May, 2025 |
| Mara G. Aspinall | - | 44,139 | 0 | 04 Jun, 2024 |
| Frank Stokes | Chief Financial Officer | 60,085 | 0 | 09 Mar, 2026 |
| Bernhard E. Spiess | Chief Business Officer | 14,696 | 0 | 14 Dec, 2021 |
| Miles Harrison | - | 21,964 | 0 | 23 May, 2025 |
| Tobin W Juvenal | Chief Commercial Officer | 86,825 | 0 | 16 Mar, 2026 |
| Kristen M Oelschlager | Chief Operating Officer | 0 | 100,937 | 04 Nov, 2025 |
| Ellen Goldberg | - | 27,254 | 0 | 23 May, 2025 |
| Kim Caple | - | 22,454 | 0 | 23 May, 2025 |
| Rodney Cotton | - | 19,331 | 0 | 30 Mar, 2026 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | A | 550 | $2.39 | 22,029 | D | M |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 550 | $25.10 | 21,479 | D | S |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 1,357 | $25.10 | 47,495 | I | S |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 1,153 | $25.10 | 40,367 | I | S |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.10 | 2,502 | I | S |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.10 | 2,502 | I | S |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.10 | 2,502 | I | S |
| 21 Apr, 2026 | Derek J Maetzold | Common Stock | D | 278 | $25.10 | 2,502 | I | S |
| 21 Apr, 2026 | Derek J Maetzold | Stock option (right to buy) | D | 550 | $0.00 | 6,968 | D | M |
| 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 | Rodney Cotton | Common Stock | A | 5,329 | - | 19,331 | D | M |