CSTL
Castle Biosciences, Inc.$36.92-1.59 (-4.13%)Prev Close$38.51·MCap$1.05B·P/E—·Vol189.5K·Yield—
▲
Buys (12M)
0
$0.00
▼
Sells (12M)
67
$21.08M
◆
Net Activity
Net Seller
$21.08M
●
Active Insiders
5
last 12 mo
Over the past 12 months, insider activity at Castle Biosciences, Inc. (CSTL) has been exclusively selling, with 0 insider purchases totaling $0.00 and 67 insider sales totaling $21.08M. The most recent insider transaction was by Juvenal Tobin W (officer: Chief Commercial Officer), who sold $239.6K worth of shares on Oct 30, 2026. Castle Biosciences, Inc. operates in the Healthcare sector, within the Medical - Diagnostics & Research industry, with a market cap of $1.05B.
CSTL Insider Trading Activity
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Oct 30, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 6,578 | $36.42 | $239.6K | 44,194 |
| Oct 28, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 3,288 | $33.08 | $108.8K | 45,431 |
| Oct 21, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,496 | $31.91 | $462.6K | 12,484-54% |
| Oct 14, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 3,288 | $33.64 | $110.6K | 48,719 |
| Oct 7, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,496 | $35.57 | $515.6K | 21,064-41% |
| Oct 5, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 4,153 | $35.95 | $149.3K | 14,702 |
| Oct 1, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 6,577 | $35.29 | $232.1K | 53,041 |
| Sep 23, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,496 | $35.33 | $512.2K | 21,479-40% |
| Sep 16, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 6,600 | $33.73 | $222.6K | 61,878 |
| Sep 15, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,518 | $32.02 | $464.9K | 21,702-40% |
| Sep 3, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 4,152 | $33.39 | $138.6K | 13,556 |
| Sep 2, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 1,730 | $32.81 | $56.8K | 65,184 |
| Sep 1, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 17,726 | $33.20 | $588.4K | 22,435-44% |
| Aug 27, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 9,050 | $35.04 | $317.1K | 66,914 |
| Aug 26, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 24,602 | $34.06 | $837.9K | 85,033 |
| Aug 19, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 1,730 | $29.59 | $51.2K | 75,964 |
| Aug 18, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 6,398 | $30.02 | $192.1K | 21,479 |
| Aug 18, 2026 | Stokes Frank | officer: Chief Financial Officer | Sell | 24,908 | $29.77 | $741.5K | 35,177-41% |
| Aug 6, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 1,301 | $38.39 | $49.9K | 77,694 |
| Aug 6, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 39,016 | $31.07 | $1.21M | 33,414-54% |
| Aug 5, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 8,586 | $29.77 | $255.6K | 18,874-31% |
| Aug 4, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 19,040 | $29.21 | $556.2K | 89,886 |
| Aug 4, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 28,646 | $30.28 | $867.5K | 36,013-44% |
| Jul 29, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $24.16 | $217.5K | 38,046 |
| Jul 16, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $22.92 | $76.5K | 39,353 |
| Jul 6, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $24.29 | $218.7K | 40,710 |
| Jul 6, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 8,586 | $24.42 | $209.7K | 22,274-28% |
| Jun 18, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 8,587 | $20.71 | $177.8K | 30,460 |
| Jun 17, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $20.66 | $69.0K | 42,067 |
| May 22, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $20.15 | $67.3K | 45,816 |
| May 11, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $22.15 | $199.4K | 46,336 |
| Apr 23, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $25.10 | $83.8K | 47,495 |
| Apr 8, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $25.03 | $225.3K | 48,852 |
| Mar 30, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $25.55 | $85.3K | 50,209 |
| Mar 19, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 19,300 | $25.91 | $500.1K | 22,129-47% |
| Mar 17, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 30,779 | $25.75 | $792.4K | 58,354-35% |
| Mar 16, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 20,863 | $25.24 | $526.6K | 86,825 |
| Mar 13, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 43,285 | $25.66 | $1.11M | 94,737-31% |
| Mar 9, 2026 | Cole G Bradley | director | Sell | 7,403 | $28.47 | $210.7K | 21,964-25% |
| Mar 9, 2026 | Stokes Frank | officer: Chief Financial Officer | Sell | 6,001 | $27.98 | $167.9K | 60,085 |
| Mar 5, 2026 | Stokes Frank | officer: Chief Financial Officer | Sell | 7,000 | $27.44 | $192.1K | 54,183 |
| Feb 5, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,846 | $39.56 | $152.2K | 84,515 |
| Feb 3, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 4,017 | $39.52 | $158.8K | 0 |
| Jan 22, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 4,017 | $40.01 | $160.7K | 87,715 |
| Jan 20, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 4,017 | $40.01 | $160.7K | 0 |
| Jan 7, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 1,339 | $40.10 | $53.7K | 29,513 |
| Jan 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 4,017 | $38.76 | $155.7K | 0 |
| Dec 22, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 830 | $40.35 | $33.5K | 0 |
| Dec 17, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 509 | $40.04 | $20.4K | 0 |
| Dec 17, 2025 | Oelschlager Kristen M | Chief Operating Officer | Sell | 14,888 | $39.31 | $585.3K | 0 |
Showing 1–50 of 298
1 / 6
...
CSTL Insider Buying Activity
The following table shows recent insider purchases of Castle Biosciences, Inc. (CSTL) stock reported via SEC Form 4 filings.
No insider buying activity found for CSTL in the last 12 months.
CSTL Insider Selling Activity
The following table shows recent insider sales of Castle Biosciences, Inc. (CSTL) stock reported via SEC Form 4 filings.
| Date | Insider | Role | Type | Shares | Avg Price | Value | Shares After |
|---|---|---|---|---|---|---|---|
| Oct 30, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 6,578 | $36.42 | $239.6K | 44,194 |
| Oct 28, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 3,288 | $33.08 | $108.8K | 45,431 |
| Oct 21, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,496 | $31.91 | $462.6K | 12,484-54% |
| Oct 14, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 3,288 | $33.64 | $110.6K | 48,719 |
| Oct 7, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,496 | $35.57 | $515.6K | 21,064-41% |
| Oct 5, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 4,153 | $35.95 | $149.3K | 14,702 |
| Oct 1, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 6,577 | $35.29 | $232.1K | 53,041 |
| Sep 23, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,496 | $35.33 | $512.2K | 21,479-40% |
| Sep 16, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 6,600 | $33.73 | $222.6K | 61,878 |
| Sep 15, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 14,518 | $32.02 | $464.9K | 21,702-40% |
| Sep 3, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 4,152 | $33.39 | $138.6K | 13,556 |
| Sep 2, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 1,730 | $32.81 | $56.8K | 65,184 |
| Sep 1, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 17,726 | $33.20 | $588.4K | 22,435-44% |
| Aug 27, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 9,050 | $35.04 | $317.1K | 66,914 |
| Aug 26, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 24,602 | $34.06 | $837.9K | 85,033 |
| Aug 19, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 1,730 | $29.59 | $51.2K | 75,964 |
| Aug 18, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 6,398 | $30.02 | $192.1K | 21,479 |
| Aug 18, 2026 | Stokes Frank | officer: Chief Financial Officer | Sell | 24,908 | $29.77 | $741.5K | 35,177-41% |
| Aug 6, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 1,301 | $38.39 | $49.9K | 77,694 |
| Aug 6, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 39,016 | $31.07 | $1.21M | 33,414-54% |
| Aug 5, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 8,586 | $29.77 | $255.6K | 18,874-31% |
| Aug 4, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 19,040 | $29.21 | $556.2K | 89,886 |
| Aug 4, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 28,646 | $30.28 | $867.5K | 36,013-44% |
| Jul 29, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $24.16 | $217.5K | 38,046 |
| Jul 16, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $22.92 | $76.5K | 39,353 |
| Jul 6, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $24.29 | $218.7K | 40,710 |
| Jul 6, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 8,586 | $24.42 | $209.7K | 22,274-28% |
| Jun 18, 2026 | Oelschlager Kristen M | officer: Chief Operating Officer | Sell | 8,587 | $20.71 | $177.8K | 30,460 |
| Jun 17, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $20.66 | $69.0K | 42,067 |
| May 22, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $20.15 | $67.3K | 45,816 |
| May 11, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $22.15 | $199.4K | 46,336 |
| Apr 23, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $25.10 | $83.8K | 47,495 |
| Apr 8, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 9,002 | $25.03 | $225.3K | 48,852 |
| Mar 30, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,338 | $25.55 | $85.3K | 50,209 |
| Mar 19, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 19,300 | $25.91 | $500.1K | 22,129-47% |
| Mar 17, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 30,779 | $25.75 | $792.4K | 58,354-35% |
| Mar 16, 2026 | Juvenal Tobin W | officer: Chief Commercial Officer | Sell | 20,863 | $25.24 | $526.6K | 86,825 |
| Mar 13, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 43,285 | $25.66 | $1.11M | 94,737-31% |
| Mar 9, 2026 | Cole G Bradley | director | Sell | 7,403 | $28.47 | $210.7K | 21,964-25% |
| Mar 9, 2026 | Stokes Frank | officer: Chief Financial Officer | Sell | 6,001 | $27.98 | $167.9K | 60,085 |
| Mar 5, 2026 | Stokes Frank | officer: Chief Financial Officer | Sell | 7,000 | $27.44 | $192.1K | 54,183 |
| Feb 5, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 3,846 | $39.56 | $152.2K | 84,515 |
| Feb 3, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 4,017 | $39.52 | $158.8K | 0 |
| Jan 22, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 4,017 | $40.01 | $160.7K | 87,715 |
| Jan 20, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 4,017 | $40.01 | $160.7K | 0 |
| Jan 7, 2026 | MAETZOLD DEREK J | director, officer: Pres. & Chief Exec. Officer | Sell | 1,339 | $40.10 | $53.7K | 29,513 |
| Jan 5, 2026 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 4,017 | $38.76 | $155.7K | 0 |
| Dec 22, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 830 | $40.35 | $33.5K | 0 |
| Dec 17, 2025 | MAETZOLD DEREK J | Pres. & Chief Exec. Officer | Sell | 509 | $40.04 | $20.4K | 0 |
| Dec 17, 2025 | Oelschlager Kristen M | Chief Operating Officer | Sell | 14,888 | $39.31 | $585.3K | 0 |
CSTL Insiders
Similar Stocks to CSTL
TMO
Thermo Fisher Scientific Inc.
$695.46-1.97%
$253.24B
DHR
Danaher Corporation
$232.46-1.91%
$163.77B
NTRA
Natera, Inc.
$413.73-5.02%
$58.36B
A
Agilent Technologies, Inc.
$175.31-3.22%
$49.61B
WAT
Waters Corporation
$461.66-3.84%
$46.82B
IQV
IQVIA Holdings Inc.
$266.23-3.21%
$44.98B
IDXX
IDEXX Laboratories, Inc.
$553.83-3.85%
$44.92B
ILMN
Illumina, Inc.
$236.85-18.37%
$43.61B