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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
Mar 9, 2026 (view filing)Mar 54 daysCole G BradleyDirectorSSale−7.40K$28.47−$210.7K−27.7%19.3K after2 lots
Mar 5, 2026 (view filing)Mar 32 daysStokes FrankChief Financial OfficerSSale−7.00K$27.44−$192.1K−11.8%52.5K after2 lots10b5-1
Feb 5, 2026 (view filing)Feb 3-42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.02K$39.52−$158.7K−4.6%83.7K after3 lots10b5-1
Jan 22, 2026 (view filing)Jan 202 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.02K$40.01−$160.7K−4.4%87.7K after10b5-1
Jan 7, 2026 (view filing)Jan 5-62 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.02K$38.76−$155.7K−12.0%29.5K after2 lots10b5-1
Dec 29, 2025 (view filing)Dec 227 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−830$40.35−$33.5K−2.4%33.5K after10b5-1
Dec 19, 2025 (view filing)Dec 172 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−509$40.04−$20.4K−1.5%34.4K after10b5-1
Dec 19, 2025 (view filing)Dec 172 daysOelschlager Kristen MChief Operating OfficerSSale−14.9K$39.31−$585.2K−54.7%12.3K after
Dec 17, 2025 (view filing)Dec 15-162 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−32.3K$38.69−$1.25M−48.1%34.9K after3 lots10b5-1
Dec 15, 2025 (view filing)Dec 114 daysJuvenal Tobin WChief Commercial OfficerSSale−13.2K$37.48−$494.7K−13.2%86.8K after
Dec 15, 2025 (view filing)Dec 114 daysStokes FrankChief Financial OfficerSSale−4.50K$37.45−$168.4K−8.2%50.3K after
Dec 8, 2025 (view filing)Dec 44 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.34K$40.03−$53.6K−3.4%37.5K after10b5-1
Dec 4, 2025 (view filing)Dec 22 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.68K$39.23−$105.1K−6.4%38.9K after10b5-1
Dec 1, 2025 (view filing)Nov 265 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.26K$40.09−$170.7K−9.3%41.6K after10b5-1
Nov 26, 2025 (view filing)Nov 251 dayMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.12K$40.05−$204.9K−10.0%45.8K after10b5-1
Nov 24, 2025 (view filing)Nov 204 daysJuvenal Tobin WChief Commercial OfficerSSale−4.69K$35.58−$167.0K−5.3%84.6K after10b5-1
Nov 20, 2025 (view filing)Nov 182 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.68K$34.02−$91.1K−5.0%50.9K after10b5-1
Nov 14, 2025 (view filing)Nov 11-123 daysJuvenal Tobin WChief Commercial OfficerSSale−700$35.39−$24.8K−0.8%84.5K afterAmended2 lots10b5-1
Nov 13, 2025 (view filing)Nov 112 daysStokes FrankChief Financial OfficerSSale−5.39K$35.08−$189.0K−11.1%43.3K after10b5-1
Nov 13, 2025 (view filing)Nov 112 daysOelschlager Kristen MChief Operating OfficerSSale−18.9K$35.10−$664.5K−60.6%12.3K after10b5-1
Nov 6, 2025 (view filing)Nov 4-52 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−9.37K$30.84−$289.1K−14.9%53.6K after3 lots10b5-1
Nov 4, 2025 (view filing)Oct 314 daysOelschlager Kristen MChief Operating OfficerSSale−12.7K$25.04−$317.5K−31.5%27.6K after10b5-1
Nov 4, 2025 (view filing)Aug 2769 daysOelschlager Kristen MChief Operating OfficerSSale−18.0K$21.69−$390.6K−15.1%100.9K afterAmended
Oct 23, 2025 (view filing)Oct 203 daysLateMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.34K$22.44−$30.0K−2.1%63.0K after10b5-1
Oct 6, 2025 (view filing)Oct 24 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.34K$22.58−$30.2K−2.0%64.3K after10b5-1
Sep 19, 2025 (view filing)Sep 172 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.34K$21.97−$29.4K−2.0%65.7K after10b5-1
Sep 4, 2025 (view filing)Sep 22 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.34K$23.93−$32.0K−2.0%67.0K after10b5-1
Aug 29, 2025 (view filing)Aug 272 daysOelschlager Kristen MChief Operating OfficerSSale−12.7K$22.02−$279.1K−8.2%141.1K after10b5-1
Aug 29, 2025 (view filing)Aug 272 daysOelschlager Kristen MChief Operating OfficerSSale−18.0K$21.69−$390.6K−10.5%153.8K after
Aug 19, 2025 (view filing)Aug 154 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.34K$20.04−$26.8K−1.9%68.3K after10b5-1
Aug 15, 2025 (view filing)Aug 132 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−43.0K$19.50−$838.9K−38.2%69.7K after10b5-1
Jul 1, 2025 (view filing)Jun 274 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.94K$20.30−$100.4K−6.6%69.7K after10b5-1
Jul 1, 2025 (view filing)Jun 274 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−17.6K$20.30−$357.9K−83.0%3.62K after6 lots10b5-1
Apr 23, 2025 (view filing)Apr 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.24K$21.52−$26.6K−1.6%74.6K after10b5-1
Apr 23, 2025 (view filing)Apr 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.41K$21.52−$94.9K−50.8%4.28K after6 lots10b5-1
Apr 10, 2025 (view filing)Apr 8-92 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.24K$20.19−$25.0K−1.6%75.9K after2 lots10b5-1
Apr 10, 2025 (view filing)Apr 8-92 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.41K$20.19−$89.0K−49.8%4.44K after12 lots10b5-1
Mar 28, 2025 (view filing)Mar 262 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.24K$20.30−$25.1K−1.6%77.1K after10b5-1
Mar 28, 2025 (view filing)Mar 262 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.41K$20.30−$89.5K−48.9%4.61K after6 lots10b5-1
Mar 11, 2025 (view filing)Mar 7-104 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−24.8K$20.06−$497.0K−24.0%78.3K after3 lots10b5-1
Mar 11, 2025 (view filing)Mar 74 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.41K$20.11−$88.7K−48.0%4.77K after12 lots10b5-1
Mar 6, 2025 (view filing)Mar 42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.25K$20.86−$26.0K−1.2%103.1K after10b5-1
Mar 6, 2025 (view filing)Mar 42 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.44K$20.86−$92.6K−47.4%4.93K after6 lots10b5-1
Feb 24, 2025 (view filing)Feb 204 daysStokes FrankChief Financial OfficerSSale−8.05K$26.70−$214.8K−18.6%35.3K after10b5-1
Feb 7, 2025 (view filing)Feb 52 daysBradbury DanielDirectorSSale−7.87K$28.17−$221.6K−100.0%0 after3 lots10b5-1
Jan 15, 2025 (view filing)Jan 132 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−986$28.03−$27.6K−1.2%80.8K after3 lots10b5-1
Jan 15, 2025 (view filing)Jan 132 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.58K$28.03−$44.3K−23.6%5.10K after18 lots10b5-1
Jan 8, 2025 (view filing)Jan 62 daysBradbury DanielDirectorSSale−7.87K$29.14−$229.2K−84.7%1.43K after9 lots10b5-1
Jan 8, 2025 (view filing)Jan 6-72 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−2.96K$29.66−$87.7K−3.5%81.8K after4 lots10b5-1
Jan 8, 2025 (view filing)Jan 6-72 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−4.73K$29.66−$140.3K−47.4%5.25K after24 lots10b5-1