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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
Jul 9, 2021 (view filing)Jul 7-82 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−20.0K$69.78−$1.40M−4.3%446.0K after8 lots
Jul 12, 2021 (view filing)Jul 8-94 daysBradbury DanielDirectorSSale−10.0K$71.05−$710.5K−6.0%155.3K after18 lots
Jul 12, 2021 (view filing)Jul 93 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$72.56−$725.6K−2.2%436.0K after4 lots
Jul 21, 2021 (view filing)Jul 19-202 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−20.0K$65.30−$1.31M−4.6%416.0K after5 lots
Jul 21, 2021 (view filing)Jul 19-202 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$65.30−$326.5K−2.9%165.0K after9 lots
Jul 23, 2021 (view filing)Jul 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$68.05−$680.5K−2.4%406.0K after3 lots
Jul 23, 2021 (view filing)Jul 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.50K$68.03−$170.1K−1.5%164.2K after9 lots
Jul 28, 2021 (view filing)Jul 26-272 daysBradbury DanielDirectorSSale−10.0K$64.98−$649.8K−6.1%152.8K after9 lots
Aug 3, 2021 (view filing)Jul 30-Aug 24 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.48K$70.21−$244.3K−2.1%163.0K after6 lots
Aug 6, 2021 (view filing)Aug 33 daysLateMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.02K$70.35−$282.8K−2.4%161.7K after3 lots
Aug 6, 2021 (view filing)Aug 3-43 daysLateBradbury DanielDirectorSSale−10.0K$69.67−$696.7K−6.2%150.3K after9 lots
Aug 17, 2021 (view filing)Aug 13-164 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−20.0K$63.20−$1.26M−4.9%386.0K after5 lots
Aug 17, 2021 (view filing)Aug 13-164 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$63.22−$316.1K−3.0%160.0K after12 lots
Aug 19, 2021 (view filing)Aug 17-182 daysBradbury DanielDirectorSSale−10.0K$61.14−$611.4K−6.3%147.8K after7 lots
Aug 19, 2021 (view filing)Aug 17-182 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$60.00−$600.0K−2.6%376.0K after5 lots
Aug 19, 2021 (view filing)Aug 172 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.50K$58.91−$147.3K−1.5%159.2K after9 lots
Aug 25, 2021 (view filing)Aug 232 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−7.50K$70.57−$529.3K−4.6%156.7K after3 lots
Aug 31, 2021 (view filing)Aug 27-304 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−20.0K$74.36−$1.49M−5.3%356.0K after6 lots
Aug 31, 2021 (view filing)Aug 27-304 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$74.31−$743.1K−6.1%153.4K after15 lots
Sep 2, 2021 (view filing)Aug 312 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−10.0K$75.71−$757.1K−2.8%346.0K after4 lots
Sep 2, 2021 (view filing)Aug 312 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.00K$75.74−$378.7K−3.2%151.7K after12 lots
Sep 7, 2021 (view filing)Sep 25 daysSpiess Bernhard E.Chief Business OfficerSSale−15.4K$75.78−$1.17M−53.2%13.6K after3 lots
Sep 10, 2021 (view filing)Sep 8-92 daysBradbury DanielDirectorSSale−10.0K$76.55−$765.5K−6.4%145.3K 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 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 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 23, 2021 (view filing)Sep 21-222 daysBradbury DanielDirectorSSale−10.0K$74.32−$743.2K−6.5%142.8K after7 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 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
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
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 6, 2021 (view filing)Oct 4-52 daysBradbury DanielDirectorSSale−10.0K$61.73−$617.3K−6.7%140.3K after9 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 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 25, 2021 (view filing)Oct 21-224 daysBradbury DanielDirectorSSale−10.0K$62.85−$628.5K−6.8%137.8K after7 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
Nov 8, 2021 (view filing)Nov 44 daysBradbury DanielDirectorSSale−4.45K$61.05−$271.4K−3.2%136.7K after3 lots
Nov 10, 2021 (view filing)Nov 82 daysBradbury DanielDirectorSSale−5.55K$61.21−$340.0K−3.9%135.3K after4 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 17, 2021 (view filing)Nov 152 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−16.4K$52.51−$861.4K−5.4%286.0K after2 lots
Jan 6, 2022 (view filing)Jan 4-52 daysBradbury DanielDirectorSSale−21.0K$42.44−$890.0K−14.2%126.3K afterFrom original6 lots
Jan 20, 2022 (view filing)Jan 182 daysBradbury DanielDirectorSSale−2.47K$35.30−$87.2K−1.9%125.7K after3 lots
Jan 24, 2022 (view filing)Jan 204 daysBradbury DanielDirectorSSale−15.6K$35.26−$550.3K−11.4%121.5K after3 lots
Jan 26, 2022 (view filing)Jan 242 daysBradbury DanielDirectorSSale−14.6K$35.42−$518.3K−11.1%117.6K after3 lots
Feb 11, 2022 (view filing)Feb 9-102 daysBradbury DanielDirectorSSale−17.7K$46.00−$814.3K−13.6%112.6K after7 lots
Feb 24, 2022 (view filing)Feb 22-232 daysBradbury DanielDirectorSSale−17.7K$39.13−$692.7K−14.1%107.6K after6 lots