CSTLNasdaq

CASTLE BIOSCIENCES INC

Alert me on CSTL

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Oct 22 Sale MAETZOLD DEREK J Insider

1 week

Result in2 trading days

1 month

Result in18 trading days

3 months

Result in60 trading days

6 months

Result in123 trading days

Oct 15 Sale Juvenal Tobin W Insider

1 week

−1.8%S&P −1.0%

1 month

Result in13 trading days

3 months

Result in55 trading days

6 months

Result in118 trading days

Oct 8 Sale MAETZOLD DEREK J Insider

1 week

+0.3%S&P −0.3%

1 month

Result in8 trading days

3 months

Result in50 trading days

6 months

Result in113 trading days

Oct 6 Sale Oelschlager Kristen M Insider

1 week

−1.4%S&P −0.1%

1 month

Result in6 trading days

3 months

Result in48 trading days

6 months

Result in111 trading days

Oct 2 Sale Juvenal Tobin W Insider

1 week

−3.2%S&P +1.2%

1 month

Result in4 trading days

3 months

Result in46 trading days

6 months

Result in109 trading days

Show all 64

Sep 24 Sale MAETZOLD DEREK J Insider

1 week

+0.2%S&P −0.4%

1 month

−6.0%S&P −0.9%

3 months

Result in40 trading days

6 months

Result in103 trading days

Sep 17 Sale Juvenal Tobin W Insider

1 week

−4.3%S&P +0.9%

1 month

−13.1%S&P +0.3%

3 months

Result in35 trading days

6 months

Result in98 trading days

Sep 16 Sale MAETZOLD DEREK J Insider

1 week

−1.7%S&P +2.1%

1 month

−4.7%S&P +2.6%

3 months

Result in34 trading days

6 months

Result in97 trading days

Sep 4 Sale Oelschlager Kristen M Insider

1 week

+1.6%S&P −1.2%

1 month

+1.4%S&P +1.4%

3 months

Result in27 trading days

6 months

Result in90 trading days

Sep 3 Sale Juvenal Tobin W Insider

1 week

−1.0%S&P −1.1%

1 month

+12.3%S&P +0.5%

3 months

Result in26 trading days

6 months

Result in89 trading days

Sep 2 Sale MAETZOLD DEREK J Insider

1 week

−3.3%S&P −1.0%

1 month

+6.4%S&P +0.8%

3 months

Result in25 trading days

6 months

Result in88 trading days

Aug 28 Sale Juvenal Tobin W Insider

1 week

−1.8%S&P +0.1%

1 month

+4.1%S&P −0.4%

3 months

Result in22 trading days

6 months

Result in85 trading days

Aug 27 Sale Oelschlager Kristen M Insider

1 week

−4.7%S&P +0.3%

1 month

+4.9%S&P −0.5%

3 months

Result in21 trading days

6 months

Result in84 trading days

Aug 20 Sale Juvenal Tobin W Insider

1 week

+4.0%S&P +1.1%

1 month

+6.3%S&P +1.7%

3 months

Result in16 trading days

6 months

Result in79 trading days

Aug 19 Sale MAETZOLD DEREK J Insider

1 week

+5.4%S&P −0.4%

1 month

+9.3%S&P −0.7%

3 months

Result in15 trading days

6 months

Result in78 trading days

Aug 19 Sale Stokes Frank Insider

1 week

+5.4%S&P −0.4%

1 month

+9.3%S&P −0.7%

3 months

Result in15 trading days

6 months

Result in78 trading days

Aug 7 Sale MAETZOLD DEREK J Insider

1 week

−7.5%S&P +0.4%

1 month

+2.3%S&P −0.9%

3 months

Result in7 trading days

6 months

Result in70 trading days

Aug 7 Sale Juvenal Tobin W Insider

1 week

−7.5%S&P +0.4%

1 month

+2.3%S&P −0.9%

3 months

Result in7 trading days

6 months

Result in70 trading days

Aug 6 Sale Oelschlager Kristen M Insider

1 week

+0.3%S&P +1.2%

1 month

+8.0%S&P +0.2%

3 months

Result in6 trading days

6 months

Result in69 trading days

Aug 5 Sale Juvenal Tobin W Insider

1 week

+3.4%S&P +0.4%

1 month

+7.4%S&P +0.4%

3 months

Result in5 trading days

6 months

Result in68 trading days

Aug 5 Sale MAETZOLD DEREK J Insider

1 week

+3.4%S&P +0.4%

1 month

+7.4%S&P +0.4%

3 months

Result in5 trading days

6 months

Result in68 trading days

Jul 30 Sale MAETZOLD DEREK J Insider

1 week

+13.7%S&P +3.6%

1 month

+25.0%S&P +3.7%

3 months

Result in1 trading day

6 months

Result in64 trading days

Jul 17 Sale MAETZOLD DEREK J Insider

1 week

+2.2%S&P −0.6%

1 month

+24.0%S&P +4.0%

3 months

+39.9%S&P +4.1%

6 months

Result in55 trading days

Jul 7 Sale Oelschlager Kristen M Insider

1 week

−3.0%S&P +0.6%

1 month

+27.6%S&P +3.0%

3 months

+53.8%S&P +3.9%

6 months

Result in47 trading days

Jul 7 Sale MAETZOLD DEREK J Insider

1 week

−3.0%S&P +0.6%

1 month

+27.6%S&P +3.0%

3 months

+53.8%S&P +3.9%

6 months

Result in47 trading days

Jun 19 Sale Oelschlager Kristen M Insider

1 week

+14.7%S&P −0.5%

1 month

+17.0%S&P +0.4%

3 months

+65.0%S&P +4.2%

6 months

Result in37 trading days

Jun 18 Sale MAETZOLD DEREK J Insider

1 week

+15.1%S&P −2.4%

1 month

+16.1%S&P +0.2%

3 months

+67.3%S&P +2.3%

6 months

Result in36 trading days

Jun 4 Sale MAETZOLD DEREK J Insider

1 week

−2.7%S&P −2.6%

1 month

+10.3%S&P −1.0%

3 months

+51.2%S&P +2.4%

6 months

Result in26 trading days

May 23 Sale MAETZOLD DEREK J Insider

1 week

+0.1%S&P +1.2%

1 month

+16.4%S&P −1.9%

3 months

+77.8%S&P +2.3%

6 months

Result in19 trading days

May 12 Sale MAETZOLD DEREK J Insider

1 week

+3.1%S&P −0.6%

1 month

+12.8%S&P −0.1%

3 months

+68.7%S&P +4.9%

6 months

Result in10 trading days

Apr 24 Sale MAETZOLD DEREK J Insider

1 week

+1.4%S&P +0.9%

1 month

−19.5%S&P +5.1%

3 months

−0.1%S&P +3.8%

6 months

+35.2%S&P +7.0%

Apr 9 Sale MAETZOLD DEREK J Insider

1 week

+4.8%S&P +3.2%

1 month

−15.4%S&P +8.5%

3 months

+1.2%S&P +11.3%

6 months

+43.9%S&P +14.4%

Mar 31 Sale MAETZOLD DEREK J Insider

1 week

+2.6%S&P +3.9%

1 month

−0.2%S&P +10.5%

3 months

+0.7%S&P +15.0%

6 months

+44.7%S&P +17.9%

Mar 20 Sale MAETZOLD DEREK J Insider

1 week

−5.9%S&P −2.2%

1 month

−1.7%S&P +8.6%

3 months

−15.2%S&P +15.1%

6 months

+40.0%S&P +19.9%

Mar 18 Sale MAETZOLD DEREK J Insider

1 week

−1.3%S&P −0.4%

1 month

−2.2%S&P +7.7%

3 months

−20.9%S&P +12.3%

6 months

+43.6%S&P +15.9%

Mar 17 Sale Juvenal Tobin W Insider

1 week

−2.1%S&P −2.4%

1 month

−5.2%S&P +4.9%

3 months

−21.0%S&P +12.2%

6 months

+37.0%S&P +13.0%

Mar 14 Sale MAETZOLD DEREK J Insider

1 week

−0.3%S&P −1.8%

1 month

−4.7%S&P +4.9%

3 months

−20.0%S&P +13.1%

6 months

+37.4%S&P +13.8%

Mar 10 Sale Stokes Frank Insider

1 week

−2.6%S&P −0.9%

1 month

−11.9%S&P +0.7%

3 months

−20.8%S&P +9.1%

6 months

+21.5%S&P +13.2%

Mar 10 Sale Cole G Bradley Insider

1 week

−2.6%S&P −0.9%

1 month

−11.9%S&P +0.7%

3 months

−20.8%S&P +9.1%

6 months

+21.5%S&P +13.2%

Mar 6 Sale Stokes Frank Insider

1 week

−5.8%S&P −1.5%

1 month

−8.4%S&P −1.7%

3 months

−22.5%S&P +10.0%

6 months

+21.3%S&P +15.2%

Feb 6 Sale MAETZOLD DEREK J Insider

1 week

+1.2%S&P −1.3%

1 month

−18.8%S&P −1.9%

3 months

−39.5%S&P +7.1%

6 months

−1.2%S&P +12.5%

Jan 23 Sale MAETZOLD DEREK J Insider

1 week

−6.7%S&P +0.4%

1 month

−29.1%S&P −0.3%

3 months

−42.1%S&P +3.9%

6 months

−42.1%S&P +7.8%

Jan 8 Sale MAETZOLD DEREK J Insider

1 week

+2.2%S&P +0.4%

1 month

−19.2%S&P +0.6%

3 months

−42.0%S&P −1.2%

6 months

−42.4%S&P +9.2%

Dec 30, 2025 Sale MAETZOLD DEREK J Insider

1 week

+3.3%S&P +0.4%

1 month

+0.2%S&P +0.7%

3 months

−36.3%S&P −4.4%

6 months

−38.7%S&P +9.0%

Dec 20, 2025 Sale MAETZOLD DEREK J Insider

1 week

−5.0%S&P +0.3%

1 month

+2.1%S&P +0.6%

3 months

−38.9%S&P −3.8%

6 months

−44.6%S&P +7.8%

Dec 20, 2025 Sale Oelschlager Kristen M Insider

1 week

−5.0%S&P +0.3%

1 month

+2.1%S&P +0.6%

3 months

−38.9%S&P −3.8%

6 months

−44.6%S&P +7.8%

Dec 18, 2025 Sale MAETZOLD DEREK J Insider

1 week

−0.5%S&P +2.3%

1 month

+3.5%S&P +1.6%

3 months

−35.0%S&P −2.6%

6 months

−46.0%S&P +9.3%

Dec 16, 2025 Sale Juvenal Tobin W Insider

1 week

+2.9%S&P +1.6%

1 month

+2.5%S&P +2.2%

3 months

−34.2%S&P −2.5%

6 months

−45.9%S&P +10.9%

Dec 16, 2025 Sale Stokes Frank Insider

1 week

+2.9%S&P +1.6%

1 month

+2.5%S&P +2.2%

3 months

−34.2%S&P −2.5%

6 months

−45.9%S&P +10.9%

Dec 9, 2025 Sale MAETZOLD DEREK J Insider

1 week

+2.1%S&P −0.6%

1 month

+2.8%S&P +1.9%

3 months

−33.8%S&P −2.2%

6 months

−45.1%S&P +8.6%

Dec 5, 2025 Sale MAETZOLD DEREK J Insider

1 week

0.0%S&P −0.6%

1 month

+5.1%S&P +0.9%

3 months

−31.2%S&P −1.0%

6 months

−45.4%S&P +8.1%

Dec 2, 2025 Sale MAETZOLD DEREK J Insider

1 week

−2.2%S&P +0.2%

1 month

−1.4%S&P +0.5%

3 months

−28.6%S&P +0.3%

6 months

−44.8%S&P +11.7%

Nov 26, 2025 Sale MAETZOLD DEREK J Insider

1 week

−0.8%S&P +0.7%

1 month

−1.7%S&P +1.5%

3 months

−29.9%S&P +1.3%

6 months

−47.5%S&P +12.2%

Nov 25, 2025 Sale Juvenal Tobin W Insider

1 week

−1.3%S&P +1.3%

1 month

−1.3%S&P +2.6%

3 months

−25.9%S&P +1.9%

6 months

−47.2%S&P +12.7%

Nov 21, 2025 Sale MAETZOLD DEREK J Insider

1 week

+3.3%S&P +3.2%

1 month

+6.1%S&P +4.7%

3 months

−18.6%S&P +5.5%

6 months

−43.9%S&P +14.5%

Nov 14, 2025 Sale Stokes Frank Insider

1 week

+13.2%S&P −1.9%

1 month

+16.7%S&P +1.0%

3 months

+0.7%S&P +2.4%

6 months

−42.6%S&P +9.8%

Nov 14, 2025 Sale Oelschlager Kristen M Insider

1 week

+13.2%S&P −1.9%

1 month

+16.7%S&P +1.0%

3 months

+0.7%S&P +2.4%

6 months

−42.6%S&P +9.8%

Nov 14, 2025 Sale Juvenal Tobin W Insider

1 week

+13.2%S&P −1.9%

1 month

+16.7%S&P +1.0%

3 months

+0.7%S&P +2.4%

6 months

−42.6%S&P +9.8%

Nov 7, 2025 Sale MAETZOLD DEREK J Insider

1 week

+1.2%S&P +0.1%

1 month

+15.8%S&P +1.8%

3 months

−2.0%S&P +3.5%

6 months

−43.6%S&P +10.6%

Nov 5, 2025 Sale Oelschlager Kristen M Insider

1 week

+3.7%S&P +0.9%

1 month

+15.1%S&P +1.2%

3 months

−2.4%S&P +2.2%

6 months

−40.9%S&P +9.5%

Oct 23, 2025 Sale MAETZOLD DEREK J Insider

1 week

+0.1%S&P +1.2%

1 month

+56.7%S&P −1.9%

3 months

+78.0%S&P +3.4%

6 months

+3.3%S&P +7.1%

Oct 7, 2025 Sale MAETZOLD DEREK J Insider

1 week

−2.4%S&P −1.0%

1 month

+46.5%S&P +1.3%

3 months

+77.2%S&P +3.4%

6 months

+2.2%S&P +2.2%

Sep 20, 2025 Sale MAETZOLD DEREK J Insider

1 week

−7.1%S&P −0.5%

1 month

−2.8%S&P +0.7%

3 months

+63.8%S&P +2.4%

6 months

+5.3%S&P −1.5%

Sep 5, 2025 Sale MAETZOLD DEREK J Insider

1 week

−9.1%S&P +1.6%

1 month

−1.1%S&P +4.1%

3 months

+68.2%S&P +6.0%

6 months

+14.7%S&P +5.4%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for CSTL

132 held · newest 5132 held · newest 2

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See all 132 filings for CSTL

Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

No signal for this ticker yet. A signal is written when insider buying here scores one dot or more.

Stakes

Mar 31, 2026 Schedule 13G, amended

Portolan Capital Management, LLC: 4.5%, 1,350,283 shares

Mar 31, 2026 Schedule 13G, amended

RTW Investments, LP: 9.3%, 2,758,335 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Dec 31, 2025 Schedule 13G

RTW Investments, LP: 7.2%, 2,115,237 shares

Dec 31, 2025 Schedule 13G, amended

Dimensional Fund Advisors LP: 3.9%, 1,143,799 shares

Sep 30, 2025 Schedule 13G

Dimensional Fund Advisors LP: 5.1%, 1,474,089 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

$40KQ4 2025

$40KQ1 2026

$40KQ2 2026

$25KQ3 2026

Down 37 percent from Q2 2026. Reported to the Senate each quarter by the firms it hires.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 8, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.