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Castle Biosciences Inc

CSTL
Exchange
Nasdaq
Industry
Services-Medical Laboratories
SEC CIK
0001447362

In the last 90 days, Castle Biosciences Inc insiders filed 0 open-market purchases and 20 sales; 176 institutions reported holding it in 13F filings for Q2 2026, worth $653.8M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Castle Biosciences Inc insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
20 filings
4 insiders, $7.90M in total
Insiders trading
4
Net value
−$7.90M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Castle Biosciences Inc, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Castle Biosciences Inc
NameTitleLast reported holdingLast filingFilings, past year
Maetzold Derek JPres. & Chief Exec. Officer9,550IndirectSep 23, 202636
Juvenal Tobin WChief Commercial Officer58,584Sep 16, 202614
Oelschlager Kristen MChief Operating Officer13,356Sep 3, 202612
Stokes FrankChief Financial Officer35,177Aug 18, 20267
Bradbury DanielDirector22,340Jun 1, 20262
Cole G BradleyDirector32,976Jun 1, 20263
Olson TiffanyDirector39,573Jun 1, 20262
Harrison MilesDirector35,631Jun 1, 20262
Goldberg EllenDirector40,921Jun 1, 20262
Caple KimDirector36,121Jun 1, 20262
Cotton RodneyDirector32,998Jun 1, 20263
Aspinall Mara G.Director44,139Jun 4, 20240
Spiess Bernhard E.Chief Business Officer14,696Dec 14, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Dec 20, 2023 (view filing)Dec 18-192 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.81K$20.66−$99.4K−28.3%12.2K after12 lots10b5-1
Dec 22, 2023 (view filing)Dec 20-212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−16.2K$21.29−$344.9K−15.8%86.5K after2 lots10b5-1
Dec 22, 2023 (view filing)Dec 20-212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.28K$21.29−$48.6K−16.0%12.0K after12 lots10b5-1
Dec 27, 2023 (view filing)Dec 22-265 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.4K$21.95−$228.3K−12.0%76.1K after2 lots10b5-1
Dec 27, 2023 (view filing)Dec 22-265 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.47K$21.95−$32.1K−11.0%11.8K after12 lots10b5-1
Dec 29, 2023 (view filing)Dec 27-282 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−12.0K$21.99−$264.5K−15.8%64.1K after2 lots10b5-1
Dec 29, 2023 (view filing)Dec 27-282 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.69K$21.99−$37.2K−12.7%11.6K after12 lots10b5-1
Jan 8, 2024 (view filing)Jan 4-54 daysBradbury DanielDirectorSSale−23.3K$20.39−$475.6K−35.8%41.8K after6 lots10b5-1
Feb 7, 2024 (view filing)Feb 5-62 daysBradbury DanielDirectorSSale−21.2K$23.24−$493.8K−38.1%34.6K after9 lots10b5-1
Feb 9, 2024 (view filing)Feb 72 daysBradbury DanielDirectorSSale−2.07K$23.20−$48.1K−5.8%33.9K after3 lots10b5-1
Mar 6, 2024 (view filing)Mar 42 daysBradbury DanielDirectorSSale−23.3K$20.68−$482.3K−47.4%25.9K after6 lots10b5-1
Mar 6, 2024 (view filing)Mar 51 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.13K$21.41−$88.4K−5.3%74.5K after
Mar 11, 2024 (view filing)Mar 74 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.37K$20.77−$49.3K−3.2%72.1K after10b5-1
Mar 11, 2024 (view filing)Mar 74 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.00K$20.77−$83.0K−26.9%10.8K after6 lots10b5-1
Mar 22, 2024 (view filing)Mar 20-212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.37K$20.28−$48.0K−3.3%69.7K after2 lots10b5-1
Mar 22, 2024 (view filing)Mar 20-212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.97K$20.28−$80.5K−27.5%10.5K after12 lots10b5-1
Apr 5, 2024 (view filing)Apr 32 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.37K$21.70−$51.4K−3.4%67.4K after10b5-1
Apr 5, 2024 (view filing)Apr 32 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.97K$21.70−$86.1K−28.3%10.1K after6 lots10b5-1
Apr 8, 2024 (view filing)Apr 4-54 daysBradbury DanielDirectorSSale−20.9K$21.12−$441.9K−52.7%18.8K after6 lots10b5-1
Apr 10, 2024 (view filing)Apr 82 daysBradbury DanielDirectorSSale−2.40K$20.45−$49.1K−11.8%17.9K after3 lots10b5-1
Apr 16, 2024 (view filing)Apr 124 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.95K$20.35−$39.6K−2.9%65.4K after10b5-1
Apr 16, 2024 (view filing)Apr 124 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.26K$20.35−$66.4K−25.1%9.75K after6 lots10b5-1
Apr 25, 2024 (view filing)Apr 232 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−421$20.11−$8.47K−0.6%65.0K after10b5-1
Apr 25, 2024 (view filing)Apr 232 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−705$20.11−$14.2K−6.8%9.68K after6 lots10b5-1
May 8, 2024 (view filing)May 62 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.37K$24.72−$58.5K−3.6%62.6K after10b5-1
May 8, 2024 (view filing)May 62 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.97K$24.72−$98.1K−29.9%9.30K after6 lots10b5-1
May 8, 2024 (view filing)May 62 daysBradbury DanielDirectorSSale−23.3K$24.64−$574.7K−70.0%9.98K after3 lots10b5-1
May 16, 2024 (view filing)May 142 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.37K$24.26−$57.5K−3.8%60.3K after2 lots10b5-1
May 16, 2024 (view filing)May 142 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.97K$24.26−$96.3K−30.8%8.91K after12 lots10b5-1
Jun 5, 2024 (view filing)Jun 32 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.37K$23.40−$55.4K−3.9%57.9K after2 lots10b5-1
Jun 5, 2024 (view filing)Jun 32 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.97K$23.40−$92.8K−31.8%8.53K after12 lots10b5-1
Jul 3, 2024 (view filing)Jul 12 daysOelschlager Kristen MChief Operating OfficerSSale−2.79K$21.22−$59.3K−1.8%148.6K after10b5-1
Jul 31, 2024 (view filing)Jul 292 daysOelschlager Kristen MChief Operating OfficerSSale−2.79K$22.06−$61.6K−1.9%145.8K after10b5-1
Aug 5, 2024 (view filing)Aug 14 daysOelschlager Kristen MChief Operating OfficerSSale−13.0K$23.06−$299.5K−8.9%132.8K after2 lots10b5-1
Aug 13, 2024 (view filing)Aug 76 daysLateStokes FrankChief Financial OfficerSSale−10.0K$25.70−$257.0K−24.5%30.8K after2 lots10b5-1
Aug 14, 2024 (view filing)Aug 122 daysBradbury DanielDirectorSSale−7.88K$26.65−$210.1K−48.0%8.55K after3 lots10b5-1
Aug 27, 2024 (view filing)Aug 23-264 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.11K$30.09−$33.5K−1.1%101.9K after2 lots10b5-1
Aug 27, 2024 (view filing)Aug 23-264 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.87K$30.09−$56.4K−18.3%8.34K after12 lots10b5-1
Sep 3, 2024 (view filing)Aug 29-305 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.66K$30.08−$49.8K−1.6%100.3K after2 lots10b5-1
Sep 3, 2024 (view filing)Aug 29-305 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.79K$30.08−$83.8K−25.6%8.07K after12 lots10b5-1
Sep 5, 2024 (view filing)Sep 32 daysOelschlager Kristen MChief Operating OfficerSSale−5.83K$29.21−$170.3K−4.1%134.8K after2 lots10b5-1
Sep 5, 2024 (view filing)Sep 3-42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−715$30.04−$21.5K−0.7%99.6K after2 lots10b5-1
Sep 5, 2024 (view filing)Sep 3-42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.20K$30.04−$36.0K−13.1%7.96K after12 lots10b5-1
Sep 9, 2024 (view filing)Sep 54 daysBradbury DanielDirectorSSale−7.87K$29.02−$228.3K−52.5%7.13K after3 lots10b5-1
Sep 11, 2024 (view filing)Sep 92 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−996$29.46−$29.3K−1.0%98.6K after10b5-1
Sep 11, 2024 (view filing)Sep 92 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.59K$29.46−$46.8K−16.9%7.81K after6 lots10b5-1
Sep 13, 2024 (view filing)Sep 112 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−996$30.32−$30.2K−1.0%97.6K after10b5-1
Sep 13, 2024 (view filing)Sep 112 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.62K$30.32−$49.1K−17.5%7.65K after6 lots10b5-1
Sep 18, 2024 (view filing)Sep 162 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.97K$30.97−$61.1K−2.0%95.6K after10b5-1
Sep 18, 2024 (view filing)Sep 162 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.15K$30.97−$97.7K−30.0%7.35K after6 lots10b5-1