Castle Biosciences's top three insider shareholders as of March 23, 2026 are David S Kabakoff (Director, 503.58K shares), Tobin W Juvenal (Chief Commercial Officer, 107.69K shares), Derek J Maetzold (Pres. Chief Exec. Officer, 105.82K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| David S Kabakoff | 0 | 503,577 | 21 Jun, 2021 | |
| Kristen M Oelschlager | Chief Operating Officer | 0 | 100,937 | 04 Nov, 2025 |
| Tobin W Juvenal | Chief Commercial Officer | 86,825 | 0 | 16 Mar, 2026 |
| Frank Stokes | Chief Financial Officer | 60,085 | 0 | 09 Mar, 2026 |
| Kristen M Oelschlager | Chief Operating Officer | 39,047 | 0 | 05 Mar, 2025 |
| Ellen Goldberg | 27,254 | 0 | 23 May, 2025 | |
| Tiffany Olson | 25,906 | 0 | 23 May, 2025 | |
| Kim Caple | 22,454 | 0 | 23 May, 2025 | |
| Miles Harrison | 21,964 | 0 | 23 May, 2025 | |
| Derek J Maetzold | Pres. Chief Exec. Officer | 21,479 | 0 | 19 Mar, 2026 |
| G Bradley Cole | 19,309 | 0 | 09 Mar, 2026 | |
| Bernhard E. Spiess | Chief Business Officer | 14,696 | 0 | 14 Dec, 2021 |
| Rodney Cotton | 14,002 | 0 | 23 May, 2025 | |
| Derek J Maetzold | Pres. Chief Exec. Officer | 0 | 3,336 | 13 Mar, 2026 |
| 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 |
|---|---|---|---|---|---|---|---|---|
| 17 Mar, 2026 | Derek J Maetzold | Common Stock | D | 18,650 | $25.93 | 22,129 | D | S |
| 18 Mar, 2026 | Derek J Maetzold | Common Stock | D | 650 | $25.39 | 21,479 | D | S |
| 13 Mar, 2026 | Derek J Maetzold | Common Stock | D | 13,204 | $25.45 | 58,354 | D | S |
| 16 Mar, 2026 | Derek J Maetzold | Common Stock | D | 17,449 | $25.96 | 40,905 | D | S |
| 16 Mar, 2026 | Derek J Maetzold | Common Stock | D | 126 | $26.68 | 40,779 | D | S |
| 12 Mar, 2026 | Tobin W Juvenal | Common Stock | D | 20,863 | $25.24 | 86,825 | D | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | A | 6,226 | $2.39 | 112,047 | D | M |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 17,310 | $26.11 | 94,737 | D | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 1,357 | $26.11 | 51,566 | I | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 1,160 | $26.11 | 43,826 | I | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 282 | $26.11 | 3,336 | I | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 279 | $26.11 | 3,336 | I | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 279 | $26.11 | 3,336 | I | S |
| 11 Mar, 2026 | Derek J Maetzold | Common Stock | D | 279 | $26.11 | 3,336 | I | S |
| 12 Mar, 2026 | Derek J Maetzold | Common Stock | D | 23,179 | $25.28 | 71,558 | D | S |
| 11 Mar, 2026 | Derek J Maetzold | Stock option (right to buy) | D | 6,226 | $0.00 | 14,282 | D | M |
| 05 Mar, 2026 | G Bradley Cole | Common Stock | A | 4,748 | $3.38 | 26,712 | D | M |
| 05 Mar, 2026 | Frank Stokes | Common Stock | D | 6,001 | $27.98 | 60,085 | D | S |
| 05 Mar, 2026 | G Bradley Cole | Common Stock | D | 4,748 | $28.44 | 21,964 | D | S |
| 05 Mar, 2026 | G Bradley Cole | Common Stock | D | 2,655 | $28.51 | 19,309 | D | S |