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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
Oct 5, 2022 (view filing)Oct 32 daysBradbury DanielDirectorSSale−7.70K$27.17−$209.3K−3.3%222.7K after2 lots
Sep 28, 2022 (view filing)Sep 26-272 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.83K$24.03−$92.1K−1.2%304.4K after3 lots
Sep 28, 2022 (view filing)Sep 26-272 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.13K$24.03−$123.2K−15.6%27.8K after18 lots
Sep 14, 2022 (view filing)Sep 12-132 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.85K$29.17−$112.3K−1.2%308.3K after3 lots
Sep 14, 2022 (view filing)Sep 12-132 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.15K$29.17−$150.2K−15.5%28.1K after18 lots
Sep 6, 2022 (view filing)Sep 15 daysBradbury DanielDirectorSSale−7.70K$28.08−$216.3K−3.2%230.4K after
Aug 31, 2022 (view filing)Aug 29-302 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.42K$29.55−$130.6K−1.4%312.1K after3 lots
Aug 31, 2022 (view filing)Aug 29-302 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.94K$29.55−$175.6K−17.2%28.5K after18 lots
Aug 17, 2022 (view filing)Aug 161 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−36$32.83−$1.18K−0.1%29.0K after5 lots
Aug 17, 2022 (view filing)Aug 15-162 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−8.00K$32.99−$264.0K−2.5%316.5K after5 lots
Aug 17, 2022 (view filing)Aug 15-162 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.9K$33.00−$360.7K−7.1%142.6K after25 lots
Aug 9, 2022 (view filing)Aug 54 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−649$30.31−$19.7K−0.2%324.5K after
Aug 9, 2022 (view filing)Aug 54 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−909$30.31−$27.6K−3.0%29.8K after6 lots
Aug 5, 2022 (view filing)Aug 3-42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.52K$30.73−$108.1K−1.1%325.2K after3 lots
Aug 5, 2022 (view filing)Aug 3-42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.93K$30.73−$151.5K−14.2%29.8K after18 lots
Aug 3, 2022 (view filing)Aug 1-22 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.83K$27.43−$105.2K−1.2%328.7K after2 lots
Aug 3, 2022 (view filing)Aug 1-22 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.13K$27.43−$140.6K−14.5%30.2K after12 lots
Aug 3, 2022 (view filing)Aug 12 daysBradbury DanielDirectorSSale−7.70K$27.47−$211.6K−3.1%238.1K after
Jul 7, 2022 (view filing)May 1256 daysLateOlson TiffanyDirectorPPurchase+1.32K$18.76+$24.8K+271.6%1.81K after2 lots
Jun 13, 2022 (view filing)Jan 4160 daysBradbury DanielDirectorSSale−16.1K$43.55−$699.1K−10.9%130.9K afterAmended3 lots
Mar 31, 2022 (view filing)Mar 29-302 daysBradbury DanielDirectorSSale−17.7K$45.12−$798.8K−15.4%97.6K after7 lots
Mar 16, 2022 (view filing)Mar 14-152 daysBradbury DanielDirectorSSale−17.7K$37.39−$661.9K−14.7%102.6K after8 lots
Feb 24, 2022 (view filing)Feb 22-232 daysBradbury DanielDirectorSSale−17.7K$39.13−$692.7K−14.1%107.6K after6 lots
Feb 11, 2022 (view filing)Feb 9-102 daysBradbury DanielDirectorSSale−17.7K$46.00−$814.3K−13.6%112.6K after7 lots
Jan 26, 2022 (view filing)Jan 242 daysBradbury DanielDirectorSSale−14.6K$35.42−$518.3K−11.1%117.6K after3 lots
Jan 24, 2022 (view filing)Jan 204 daysBradbury DanielDirectorSSale−15.6K$35.26−$550.3K−11.4%121.5K after3 lots
Jan 20, 2022 (view filing)Jan 182 daysBradbury DanielDirectorSSale−2.47K$35.30−$87.2K−1.9%125.7K after3 lots
Jan 6, 2022 (view filing)Jan 4-52 daysBradbury DanielDirectorSSale−21.0K$42.44−$890.0K−14.2%126.3K afterFrom original6 lots
Nov 17, 2021 (view filing)Nov 152 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−16.4K$52.51−$861.4K−5.4%286.0K after2 lots
Nov 12, 2021 (view filing)Nov 9-103 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.70K$56.53−$209.2K−2.6%138.0K after21 lots
Nov 10, 2021 (view filing)Nov 82 daysBradbury DanielDirectorSSale−5.55K$61.21−$340.0K−3.9%135.3K after4 lots
Nov 8, 2021 (view filing)Nov 44 daysBradbury DanielDirectorSSale−4.45K$61.05−$271.4K−3.2%136.7K after3 lots
Oct 25, 2021 (view filing)Oct 214 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.50K$62.95−$157.4K−1.8%139.2K after9 lots
Oct 25, 2021 (view filing)Oct 21-224 daysBradbury DanielDirectorSSale−10.0K$62.85−$628.5K−6.8%137.8K after7 lots
Oct 21, 2021 (view filing)Oct 19-202 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$66.24−$331.2K−3.4%140.0K after15 lots
Oct 8, 2021 (view filing)Oct 62 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.50K$63.74−$159.4K−1.7%141.7K after6 lots
Oct 6, 2021 (view filing)Oct 4-52 daysBradbury DanielDirectorSSale−10.0K$61.73−$617.3K−6.7%140.3K after9 lots
Oct 6, 2021 (view filing)Oct 4-52 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$61.70−$308.5K−3.4%142.5K after18 lots
Oct 1, 2021 (view filing)Sep 301 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$65.92−$659.2K−3.4%286.0K after3 lots
Oct 1, 2021 (view filing)Sep 301 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.50K$65.89−$164.7K−1.7%144.2K after9 lots
Sep 30, 2021 (view filing)Sep 28-292 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−20.0K$66.15−$1.32M−6.3%296.0K after8 lots
Sep 30, 2021 (view filing)Sep 28-292 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$66.15−$330.8K−3.3%145.0K after18 lots
Sep 29, 2021 (view filing)Sep 272 daysOelschlager Kristen MChief Operating OfficerSSale−10.0K$71.02−$710.2K−9.3%97.5K after2 lots
Sep 23, 2021 (view filing)Sep 21-222 daysBradbury DanielDirectorSSale−10.0K$74.32−$743.2K−6.5%142.8K after7 lots
Sep 16, 2021 (view filing)Sep 151 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$74.36−$743.6K−3.1%316.0K after3 lots
Sep 16, 2021 (view filing)Sep 151 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$74.39−$371.9K−3.3%146.7K after6 lots
Sep 15, 2021 (view filing)Sep 141 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.33K$74.39−$247.9K−2.2%148.4K after8 lots
Sep 15, 2021 (view filing)Sep 13-142 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−20.0K$73.84−$1.48M−5.8%326.0K after9 lots
Sep 15, 2021 (view filing)Sep 13-142 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.67K$73.48−$489.9K−4.6%138.1K after19 lots
Sep 10, 2021 (view filing)Sep 8-92 daysBradbury DanielDirectorSSale−10.0K$76.55−$765.5K−6.4%145.3K after8 lots