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Castle Biosciences Inc Insider Trading
Every director, officer and 10% holder of Castle Biosciences Inc has to report each trade in its stock within two business days of making it. This is those filings.
CSTL on carbonthat →Insiders filing
4
127 reported lines
Open-market buys
0
Open-market sales
99
$8.6M
Net
$8.6M
sold more
Purchases and sales
Open-market trades only — the lines where someone chose to buy or sell at the going price.
| Insider | Action | Value |
|---|---|---|
| Derek J MaetzoldPres. & Chief Exec. Officer2026-10-058.6K shat $35.57 | Sale10b5-1 plan | $305.2K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-10-053.2K shat $35.57 | Sale10b5-1 plan | $113.7K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-10-052.7K shat $35.57 | Sale10b5-1 plan | $96.7K |
| Kristen M OelschlagerChief Operating Officer2026-10-012.8K shat $35.75 | Sale10b5-1 plan | $100.4K |
| Kristen M OelschlagerChief Operating Officer2026-10-011.3K shat $36.38 | Sale10b5-1 plan | $49K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-218.6K shat $35.33 | Sale10b5-1 plan | $303.2K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-213.2K shat $35.33 | Sale10b5-1 plan | $113K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-212.7K shat $35.33 | Sale10b5-1 plan | $96K |
| Tobin W JuvenalChief Commercial Officer2026-09-153.3K shat $35.14 | Sale10b5-1 plan | $115.8K |
| Tobin W JuvenalChief Commercial Officer2026-09-143.3K shat $32.32 | Sale10b5-1 plan | $106.9K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-118.4K shat $32.00 | Sale10b5-1 plan | $267.6K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-113.1K shat $32.00 | Sale10b5-1 plan | $100K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-112.7K shat $32.00 | Sale10b5-1 plan | $85K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-11223 shat $32.78 | Sale10b5-1 plan | $7.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-1183 shat $32.78 | Sale10b5-1 plan | $2.7K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-09-1171 shat $32.78 | Sale10b5-1 plan | $2.3K |
| Kristen M OelschlagerChief Operating Officer2026-09-014K shat $33.36 | Sale10b5-1 plan | $131.8K |
| Kristen M OelschlagerChief Operating Officer2026-09-01200 shat $34.02 | Sale10b5-1 plan | $6.8K |
| Tobin W JuvenalChief Commercial Officer2026-08-311.7K shat $32.81 | Sale10b5-1 plan | $56.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-2811.5K shat $33.14 | Sale10b5-1 plan | $380.2K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-282.5K shat $33.14 | Sale10b5-1 plan | $83K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-282.1K shat $33.14 | Sale10b5-1 plan | $70.6K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28257 shat $33.14 | Sale10b5-1 plan | $8.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28257 shat $33.14 | Sale10b5-1 plan | $8.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28257 shat $33.14 | Sale10b5-1 plan | $8.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28257 shat $33.14 | Sale10b5-1 plan | $8.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28956 shat $33.88 | Sale10b5-1 plan | $32.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28209 shat $33.88 | Sale10b5-1 plan | $7.1K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-28177 shat $33.88 | Sale10b5-1 plan | $6K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-2821 shat $33.88 | Sale10b5-1 plan | $711.5 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-2821 shat $33.88 | Sale10b5-1 plan | $711.5 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-2821 shat $33.88 | Sale10b5-1 plan | $711.5 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-2821 shat $33.88 | Sale10b5-1 plan | $711.5 |
| Tobin W JuvenalChief Commercial Officer2026-08-259.1K shat $35.04 | Sale10b5-1 plan | $317.1K |
| Kristen M OelschlagerChief Operating Officer2026-08-257.2K shat $34.26 | Sale | $245.4K |
| Kristen M OelschlagerChief Operating Officer2026-08-255.2K shat $34.64 | Sale | $180.9K |
| Kristen M OelschlagerChief Operating Officer2026-08-2412.2K shat $33.69 | Sale | $411.6K |
| Tobin W JuvenalChief Commercial Officer2026-08-171.7K shat $29.59 | Sale10b5-1 plan | $51.2K |
| Frank StokesChief Financial Officer2026-08-1424.9K shat $29.77 | Sale | $741.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-141.1K shat $30.02 | Sale10b5-1 plan | $33K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-142.7K shat $30.02 | Sale10b5-1 plan | $81.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-142.3K shat $30.02 | Sale10b5-1 plan | $69.2K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-14278 shat $30.02 | Sale10b5-1 plan | $8.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-14278 shat $30.02 | Sale10b5-1 plan | $8.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-14278 shat $30.02 | Sale10b5-1 plan | $8.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-14278 shat $30.02 | Sale10b5-1 plan | $8.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-052.5K shat $30.68 | Sale10b5-1 plan | $78.1K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-05556 shat $30.68 | Sale10b5-1 plan | $17.1K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-05473 shat $30.68 | Sale10b5-1 plan | $14.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-048.4K shat $30.79 | Sale10b5-1 plan | $259.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-043.4K shat $30.79 | Sale10b5-1 plan | $103.9K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-042.9K shat $30.79 | Sale10b5-1 plan | $88.2K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-0411.9K shat $31.34 | Sale10b5-1 plan | $374K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-044.8K shat $31.34 | Sale10b5-1 plan | $149.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-044.1K shat $31.34 | Sale10b5-1 plan | $127.3K |
| Kristen M OelschlagerChief Operating Officer2026-08-033K shat $29.12 | Sale10b5-1 plan | $87.4K |
| Kristen M OelschlagerChief Operating Officer2026-08-034.5K shat $30.00 | Sale10b5-1 plan | $134.6K |
| Kristen M OelschlagerChief Operating Officer2026-08-031.1K shat $30.62 | Sale10b5-1 plan | $33.7K |
| Tobin W JuvenalChief Commercial Officer2026-08-031.7K shat $28.25 | Sale10b5-1 plan | $48.9K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-0310.7K shat $30.35 | Sale10b5-1 plan | $323.7K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-034.2K shat $30.35 | Sale10b5-1 plan | $128.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-08-033.6K shat $30.35 | Sale10b5-1 plan | $109.2K |
| Tobin W JuvenalChief Commercial Officer2026-07-318.1K shat $28.84 | Sale10b5-1 plan | $235K |
| Tobin W JuvenalChief Commercial Officer2026-07-317.3K shat $29.58 | Sale10b5-1 plan | $215K |
| Tobin W JuvenalChief Commercial Officer2026-07-311.9K shat $30.26 | Sale10b5-1 plan | $57.2K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-316.5K shat $30.15 | Sale10b5-1 plan | $195.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-312K shat $30.15 | Sale10b5-1 plan | $59.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-311.7K shat $30.15 | Sale10b5-1 plan | $51K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-276K shat $24.13 | Sale10b5-1 plan | $144.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-271.3K shat $24.13 | Sale10b5-1 plan | $31.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-271.1K shat $24.13 | Sale10b5-1 plan | $26.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-27268 shat $24.13 | Sale10b5-1 plan | $6.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-27268 shat $24.13 | Sale10b5-1 plan | $6.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-27268 shat $24.13 | Sale10b5-1 plan | $6.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-27268 shat $24.13 | Sale10b5-1 plan | $6.5K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-27232 shat $25.06 | Sale10b5-1 plan | $5.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-2750 shat $25.06 | Sale10b5-1 plan | $1.3K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-2743 shat $25.06 | Sale10b5-1 plan | $1.1K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-2710 shat $25.06 | Sale10b5-1 plan | $250.6 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-2710 shat $25.06 | Sale10b5-1 plan | $250.6 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-2710 shat $25.06 | Sale10b5-1 plan | $250.6 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-2710 shat $25.06 | Sale10b5-1 plan | $250.6 |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-14550 shat $22.92 | Sale10b5-1 plan | $12.6K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-141.4K shat $22.92 | Sale10b5-1 plan | $31.1K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-141.2K shat $22.92 | Sale10b5-1 plan | $26.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-14278 shat $22.92 | Sale10b5-1 plan | $6.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-14278 shat $22.92 | Sale10b5-1 plan | $6.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-14278 shat $22.92 | Sale10b5-1 plan | $6.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-14278 shat $22.92 | Sale10b5-1 plan | $6.4K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-016.2K shat $24.29 | Sale10b5-1 plan | $150.9K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-011.4K shat $24.29 | Sale10b5-1 plan | $33K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-011.2K shat $24.29 | Sale10b5-1 plan | $28K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-01278 shat $24.29 | Sale10b5-1 plan | $6.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-01278 shat $24.29 | Sale10b5-1 plan | $6.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-01278 shat $24.29 | Sale10b5-1 plan | $6.8K |
| Derek J MaetzoldPres. & Chief Exec. Officer2026-07-01278 shat $24.29 | Sale10b5-1 plan | $6.8K |
| Kristen M OelschlagerChief Operating Officer2026-07-018.2K shat $24.40 | Sale10b5-1 plan | $199.7K |
| Kristen M OelschlagerChief Operating Officer2026-07-01400 shat $24.78 | Sale10b5-1 plan | $9.9K |
| Tobin W JuvenalChief Commercial Officer2025-11-241.3K shat $38.39 | Sale10b5-1 plan | $49.9K |
Source: SEC Form 4 filings, via EDGAR. A derivative line reports the shares underlying an option rather than stock outstanding, so it is marked and is not comparable with the rest. Value is shares times the reported price, and is blank where the filing priced the transaction at zero — a grant costs its recipient nothing. Insiders sell for reasons that have nothing to do with the company, which is why a sale is not read as a signal on its own.
More on CSTL
Company overviewEverything on CSTL in one place, with the price.SEC filingsWhat CSTL's 8-Ks say happened: results, departures, auditor changes.Planned salesSales CSTL insiders have filed notice of.Executive payWhat CSTL awarded its chief executive, and what it became.Who owns itEvery manager reporting a position in CSTL.Funds holding itWhich funds and ETFs hold CSTL, and how big a bet.LobbyingWhat CSTL spends lobbying Congress, and on what.Who lobbies for itThe lobbyists on CSTL's account, and who they worked for.Federal contractsWhat federal agencies pay CSTL.PatentsWhat CSTL is filing at the patent office.
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