Insider Ledger
CSTL insider buying and SEC filings, explained
Castle Biosciences Inc. · CIK 1447362
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- Nasdaq
- Industry (SIC)
- Services-Medical Laboratories
- State of incorporation
- DE
- Fiscal year end
- Dec 31
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$3.0M
Planned sales (10b5-1)
$16.9M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Nov 2, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 14,496 shares directly and indirectly (by trust) at about $36.10 ($523K), marked as a 10b5-1 plan trade. Direct holdings down 69% to 3,904 shares. | SEC filing Filed Nov 4, 2026, 4:07 PM ET |
| Oct 28, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 6,578 shares at about $36.42 ($240K), marked as a 10b5-1 plan trade. Holdings down 14% to 38,853 shares. | SEC filing Filed Oct 30, 2026, 4:06 PM ET |
| Oct 26, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 3,288 shares at about $33.08 ($109K), marked as a 10b5-1 plan trade. Holdings down 7% to 45,431 shares. | SEC filing Filed Oct 28, 2026, 4:08 PM ET |
| Oct 19, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 14,496 shares directly and indirectly (by trust) at about $31.91 ($463K), marked as a 10b5-1 plan trade. Direct holdings down 41% to 12,484 shares. | SEC filing Filed Oct 21, 2026, 4:18 PM ET |
| Oct 12, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 3,288 shares at about $33.64 ($111K), marked as a 10b5-1 plan trade. Holdings down 6% to 48,719 shares. | SEC filing Filed Oct 14, 2026, 4:06 PM ET |
| Oct 5, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 14,496 shares directly and indirectly (by trust) at about $35.57 ($516K), marked as a 10b5-1 plan trade. Direct holdings down 29% to 21,064 shares. | SEC filing Filed Oct 7, 2026, 4:10 PM ET |
| Oct 1, 2026 | Planned (10b5-1) | Kristen M Oelschlager (President / COO) sold 4,153 shares at about $35.95 ($149K), marked as a 10b5-1 plan trade. Holdings down 24% to 13,356 shares. | SEC filing Filed Oct 5, 2026, 4:07 PM ET |
| Sep 29–30, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 6,577 shares between Sep 29 and Sep 30 at about $35.29 ($232K), marked as a 10b5-1 plan trade. Holdings down 11% to 52,007 shares. | SEC filing Filed Oct 1, 2026, 4:21 PM ET |
| Sep 21, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 14,496 shares directly and indirectly (by trust) at about $35.33 ($512K), marked as a 10b5-1 plan trade. Direct holdings down 29% to 21,479 shares. | SEC filing Filed Sep 23, 2026 |
| Sep 14–15, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 6,600 shares between Sep 14 and Sep 15 at about $33.73 ($223K), marked as a 10b5-1 plan trade. Holdings down 10% to 58,584 shares. | SEC filing Filed Sep 16, 2026 |
| Sep 11, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 14,518 shares directly and indirectly (by trust) at about $32.02 ($465K), marked as a 10b5-1 plan trade. Direct holdings down 29% to 21,479 shares. | SEC filing Filed Sep 15, 2026 |
| Sep 1, 2026 | Planned (10b5-1) | Kristen M Oelschlager (President / COO) sold 4,152 shares at about $33.39 ($139K), marked as a 10b5-1 plan trade. Holdings down 24% to 13,356 shares. | SEC filing Filed Sep 3, 2026 |
| Aug 31, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 1,730 shares at about $32.81 ($57K), marked as a 10b5-1 plan trade. Holdings down 3% to 65,184 shares. | SEC filing Filed Sep 2, 2026 |
| Aug 28, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 18,560 shares directly and indirectly (by trust) at about $33.20 ($616K), marked as a 10b5-1 plan trade. Direct holdings down 37% to 21,479 shares. | SEC filing Filed Sep 1, 2026 |
| Aug 25, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 9,050 shares at about $35.04 ($317K), marked as a 10b5-1 plan trade. Holdings down 12% to 66,914 shares. | SEC filing Filed Aug 27, 2026 |
| Aug 24–25, 2026 | Sale | Kristen M Oelschlager (President / COO) sold 24,602 shares indirectly (by trust) between Aug 24 and Aug 25 at about $34.06 ($838K). Holdings by trust down 25% to 72,649 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 26, 2026 |
| Aug 17, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 1,730 shares at about $29.59 ($51K), marked as a 10b5-1 plan trade. Holdings down 2% to 75,964 shares. | SEC filing Filed Aug 19, 2026 |
| Aug 14, 2026 | Sale | Frank Stokes (CFO) sold 24,908 shares at about $29.77 ($742K). Holdings down 41% to 35,177 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 18, 2026 |
| Aug 14, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 7,232 shares directly and indirectly (by trust) at about $30.02 ($217K), marked as a 10b5-1 plan trade. Direct holdings down 5% to 21,479 shares. | SEC filing Filed Aug 18, 2026 |
| Aug 4–5, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 39,016 shares directly and indirectly (by trust) between Aug 4 and Aug 5 at about $31.07 ($1.2M), marked as a 10b5-1 plan trade. Direct holdings down 52% to 21,479 shares. | SEC filing Filed Aug 6, 2026 |
| Nov 24, 2025 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 1,301 shares at $38.39 ($50K), marked as a 10b5-1 plan trade. Holdings down 2% to 77,694 shares. | SEC filing Filed Aug 6, 2026 |
| Aug 3, 2026 | Planned (10b5-1) | Kristen M Oelschlager (President / COO) sold 8,586 shares at about $29.77 ($256K), marked as a 10b5-1 plan trade. Holdings down 39% to 13,288 shares. | SEC filing Filed Aug 5, 2026 |
| Jul 31–Aug 3, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 19,040 shares between Jul 31 and Aug 3 at about $29.21 ($556K), marked as a 10b5-1 plan trade. Holdings down 19% to 78,995 shares. | SEC filing Filed Aug 4, 2026 |
| Jul 31–Aug 3, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 28,646 shares directly and indirectly (by trust) between Jul 31 and Aug 3 at about $30.28 ($867K), marked as a 10b5-1 plan trade. Direct holdings down 44% to 21,479 shares. | SEC filing Filed Aug 4, 2026 |
| Jul 27, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 9,836 shares directly and indirectly (by trust) at about $24.16 ($238K), marked as a 10b5-1 plan trade. Direct holdings down 22% to 21,479 shares. | SEC filing Filed Jul 29, 2026 |
| Jul 14, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,172 shares directly and indirectly (by trust) at about $22.92 ($96K), marked as a 10b5-1 plan trade. Direct holdings down 2% to 21,479 shares. | SEC filing Filed Jul 16, 2026 |
| Jul 1, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 9,836 shares directly and indirectly (by trust) at about $24.29 ($239K), marked as a 10b5-1 plan trade. Direct holdings down 22% to 21,479 shares. | SEC filing Filed Jul 6, 2026 |
| Jul 1, 2026 | Planned (10b5-1) | Kristen M Oelschlager (President / COO) sold 8,586 shares at about $24.42 ($210K), marked as a 10b5-1 plan trade. Holdings down 28% to 21,874 shares. | SEC filing Filed Jul 6, 2026 |
| Jun 16, 2026 | Planned (10b5-1) | Kristen M Oelschlager (President / COO) sold 8,587 shares at about $20.71 ($178K), marked as a 10b5-1 plan trade. Holdings down 22% to 30,460 shares. | SEC filing Filed Jun 18, 2026 |
| Jun 15, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,172 shares directly and indirectly (by trust) at about $20.66 ($86K), marked as a 10b5-1 plan trade. Direct holdings down 2% to 21,479 shares. | SEC filing Filed Jun 17, 2026 |
| Jun 1, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 9,836 shares directly and indirectly (by trust) at about $20.86 ($205K), marked as a 10b5-1 plan trade. Direct holdings down 22% to 21,479 shares. | SEC filing Filed Jun 3, 2026 |
| May 20–21, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,172 shares directly and indirectly (by trust) between May 20 and May 21 at about $20.15 ($84K), marked as a 10b5-1 plan trade. Direct holdings down 2% to 21,479 shares. | SEC filing Filed May 22, 2026 |
| May 7, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 9,836 shares directly and indirectly (by trust) at about $22.15 ($218K), marked as a 10b5-1 plan trade. Direct holdings down 22% to 21,479 shares. | SEC filing Filed May 11, 2026 |
| Apr 21, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,172 shares directly and indirectly (by trust) at about $25.10 ($105K), marked as a 10b5-1 plan trade. Direct holdings down 2% to 21,479 shares. | SEC filing Filed Apr 23, 2026 |
| Apr 6, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 9,836 shares directly and indirectly (by trust) at about $25.03 ($246K), marked as a 10b5-1 plan trade. Direct holdings down 22% to 21,479 shares. | SEC filing Filed Apr 8, 2026 |
| Mar 26, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,172 shares directly and indirectly (by trust) at about $25.55 ($107K), marked as a 10b5-1 plan trade. Direct holdings down 2% to 21,479 shares. | SEC filing Filed Mar 30, 2026 |
| Mar 17–18, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 19,300 shares between Mar 17 and Mar 18 at about $25.91 ($500K), marked as a 10b5-1 plan trade. Holdings down 47% to 21,479 shares. | SEC filing Filed Mar 19, 2026 |
| Mar 13–16, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 30,779 shares between Mar 13 and Mar 16 at about $25.74 ($792K), marked as a 10b5-1 plan trade. Holdings down 43% to 40,779 shares. | SEC filing Filed Mar 17, 2026 |
| Mar 12, 2026 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 20,863 shares at about $25.24 ($527K), marked as a 10b5-1 plan trade. Holdings down 19% to 86,825 shares. | SEC filing Filed Mar 16, 2026 |
| Mar 11–12, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 44,125 shares directly and indirectly (by trust) between Mar 11 and Mar 12 at about $25.67 ($1.1M), marked as a 10b5-1 plan trade. Direct holdings down 36% to 71,558 shares. | SEC filing Filed Mar 13, 2026 |
| Mar 5, 2026 | Planned (10b5-1) | Frank Stokes (CFO) sold 6,001 shares at about $27.98 ($168K), marked as a 10b5-1 plan trade. Holdings down 9% to 60,085 shares. | SEC filing Filed Mar 9, 2026 |
| Mar 5, 2026 | Sale | G Bradley Cole (Director) sold 7,403 shares at about $28.47 ($211K). Holdings down 28% to 19,309 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 9, 2026 |
| Mar 3, 2026 | Planned (10b5-1) | Frank Stokes (CFO) sold 7,000 shares at about $27.44 ($192K), marked as a 10b5-1 plan trade. Holdings down 12% to 52,483 shares. | SEC filing Filed Mar 5, 2026 |
| Feb 3–4, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,017 shares between Feb 3 and Feb 4 at about $39.52 ($159K), marked as a 10b5-1 plan trade. Holdings down 5% to 83,698 shares. | SEC filing Filed Feb 5, 2026 |
| Jan 20, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,017 shares at about $40.01 ($161K), marked as a 10b5-1 plan trade. Holdings down 4% to 87,715 shares. | SEC filing Filed Jan 22, 2026 |
| Jan 5–6, 2026 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,017 shares between Jan 5 and Jan 6 at about $38.76 ($156K), marked as a 10b5-1 plan trade. Holdings down 12% to 29,513 shares. | SEC filing Filed Jan 7, 2026 |
| Dec 22, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 830 shares at about $40.35 ($33K), marked as a 10b5-1 plan trade. Holdings down 2% to 33,530 shares. | SEC filing Filed Dec 29, 2025 |
| Dec 17, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 509 shares at about $40.04 ($20K), marked as a 10b5-1 plan trade. Holdings down 1% to 34,360 shares. | SEC filing Filed Dec 19, 2025 |
| Dec 17, 2025 | Sale | Kristen M Oelschlager (President / COO) sold 14,888 shares at about $39.31 ($585K). Holdings down 55% to 12,323 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 19, 2025 |
| Dec 15–16, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 32,346 shares between Dec 15, 2025 and Dec 16, 2025 at about $38.69 ($1.3M), marked as a 10b5-1 plan trade. Holdings down 48% to 34,869 shares. | SEC filing Filed Dec 17, 2025 |
| Dec 11, 2025 | Sale | Tobin W Juvenal (Chief Commercial Officer) sold 13,200 shares at about $37.48 ($495K). Holdings down 13% to 86,825 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 15, 2025 |
| Dec 11, 2025 | Sale | Frank Stokes (CFO) sold 4,496 shares at $37.45 ($168K). Holdings down 8% to 50,326 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 15, 2025 |
| Dec 4, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 1,339 shares at about $40.03 ($54K), marked as a 10b5-1 plan trade. Holdings down 3% to 37,547 shares. | SEC filing Filed Dec 8, 2025 |
| Dec 2, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 2,678 shares at about $39.23 ($105K), marked as a 10b5-1 plan trade. Holdings down 6% to 38,886 shares. | SEC filing Filed Dec 4, 2025 |
| Nov 26, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 4,258 shares at about $40.09 ($171K), marked as a 10b5-1 plan trade. Holdings down 9% to 41,564 shares. | SEC filing Filed Dec 1, 2025 |
| Nov 25, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 5,115 shares at about $40.05 ($205K), marked as a 10b5-1 plan trade. Holdings down 10% to 45,822 shares. | SEC filing Filed Nov 26, 2025 |
| Nov 20, 2025 | Planned (10b5-1) | Tobin W Juvenal (Chief Commercial Officer) sold 4,693 shares at about $35.58 ($167K), marked as a 10b5-1 plan trade. Holdings down 5% to 84,595 shares. | SEC filing Filed Nov 24, 2025 |
| Nov 18, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 2,678 shares at about $34.02 ($91K), marked as a 10b5-1 plan trade. Holdings down 5% to 50,937 shares. | SEC filing Filed Nov 20, 2025 |
| Nov 11–12, 2025 | Planned (10b5-1) Amended filing | Tobin W Juvenal (Chief Commercial Officer) sold 700 shares between Nov 11, 2025 and Nov 12, 2025 at about $35.39 ($25K), marked as a 10b5-1 plan trade. Holdings down 1% to 84,527 shares. This amends a filing from Nov 13, 2025. | SEC filing Filed Nov 14, 2025 |
| Nov 11, 2025 | Planned (10b5-1) | Frank Stokes (CFO) sold 5,388 shares at about $35.08 ($189K), marked as a 10b5-1 plan trade. Holdings down 11% to 43,328 shares. | SEC filing Filed Nov 13, 2025 |
| Nov 11, 2025 | Planned (10b5-1) | Kristen M Oelschlager (President / COO) sold 18,932 shares at about $35.10 ($665K), marked as a 10b5-1 plan trade. Holdings down 61% to 12,323 shares. | SEC filing Filed Nov 13, 2025 |
| Nov 4–5, 2025 | Planned (10b5-1) | Derek J. Maetzold (Pres. & Chief Exec. Officer and Director) sold 9,373 shares between Nov 4, 2025 and Nov 5, 2025 at about $30.84 ($289K), marked as a 10b5-1 plan trade. Holdings down 15% to 53,615 shares. | SEC filing Filed Nov 6, 2025 |
51 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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