As of September 17, 2026, Castle Biosciences's top three insider holders are Derek J Maetzold (Pres. Chief Exec. Officer, 93.20K shares), Kristen M Oelschlager (Chief Operating Officer, 72.65K shares), Tobin W Juvenal (Chief Commercial Officer, 58.58K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Derek J Maetzold | Pres. Chief Exec. Officer | 21,479 | 71,726 | 93,205 | 18.7% | 15 Sep, 2026 |
| 2 | Tobin W Juvenal | Chief Commercial Officer | 58,584 | 0 | 58,584 | 11.7% | 16 Sep, 2026 |
| 3 | Mara G. Aspinall | Director | 44,139 | 0 | 44,139 | 8.8% | 04 Jun, 2024 |
| 4 | Ellen Goldberg | Director | 40,921 | 0 | 40,921 | 8.2% | 27 May, 2025 |
| 5 | Tiffany Olson | Director | 39,573 | 0 | 39,573 | 7.9% | 27 May, 2025 |
| 6 | Kim Caple | Director | 36,121 | 0 | 36,121 | 7.2% | 27 May, 2025 |
| 7 | Miles Harrison | Director | 35,631 | 0 | 35,631 | 7.1% | 27 May, 2025 |
| 8 | Frank Stokes | Chief Financial Officer | 35,177 | 0 | 35,177 | 7.0% | 18 Aug, 2026 |
| 9 | Rodney Cotton | Director | 32,998 | 0 | 32,998 | 6.6% | 27 May, 2025 |
| 10 | G Bradley Cole | Director | 32,976 | 0 | 32,976 | 6.6% | 27 May, 2026 |
| 11 | Daniel Bradbury | Director | 22,340 | 0 | 22,340 | 4.5% | 27 May, 2025 |
| 12 | Bernhard E. Spiess | Chief Business Officer | 14,696 | 0 | 14,696 | 2.9% | 14 Dec, 2021 |
| 13 | Kristen M Oelschlager | Chief Operating Officer | 13,356 | 0 | 13,356 | 2.7% | 03 Sep, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 01 Sep, 2026 | Kristen M Oelschlager | Chief Operating Officer | Acquired M | 4,152 | $3.38 | $14.03K | 17,508 | Direct |
| 01 Sep, 2026 | Kristen M Oelschlager | Chief Operating Officer | Disposed S | 3,952 | $33.36 | $131.84K | 13,556 | Direct |
| 01 Sep, 2026 | Kristen M Oelschlager | Chief Operating Officer | Disposed S | 200 | $34.02 | $6.80K | 13,356 | Direct |
| 01 Sep, 2026 | Kristen M Oelschlager | Chief Operating Officer | Disposed M | 4,152 | $0.00 | $0 | 12,458 | Direct |
| 31 Aug, 2026 | Tobin W Juvenal | Chief Commercial Officer | Disposed S | 1,730 | $32.81 | $56.76K | 65,184 | Direct |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Acquired M | 12,428 | $2.39 | $29.70K | 33,907 | Direct |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 11,472 | $33.14 | $380.18K | 22,435 | Direct |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 2,505 | $33.14 | $83.02K | 17,850 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 2,129 | $33.14 | $70.56K | 15,172 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 257 | $33.14 | $8.52K | 11,277 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 257 | $33.14 | $8.52K | 11,277 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 257 | $33.14 | $8.52K | 11,277 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 257 | $33.14 | $8.52K | 11,277 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 956 | $33.88 | $32.39K | 21,479 | Direct |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 209 | $33.88 | $7.08K | 17,641 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 177 | $33.88 | $6.00K | 14,995 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 21 | $33.88 | $711 | 11,256 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 21 | $33.88 | $711 | 11,256 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 21 | $33.88 | $711 | 11,256 | Indirect |
| 28 Aug, 2026 | Derek J Maetzold | Pres. Chief Exec. Officer | Disposed S | 21 | $33.88 | $711 | 11,256 | Indirect |