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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
Sep 23, 2026 (view filing)4:27 PM ETSep 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−8.58K$35.33−$303.2K−28.5%21.5K after10b5-1
Sep 23, 2026 (view filing)4:27 PM ETSep 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.92K$35.33−$209.0K−38.3%9.55K after2 lots10b5-1
Sep 16, 2026 (view filing)4:20 PM ETSep 14-152 daysJuvenal Tobin WChief Commercial OfficerSSale−6.60K$33.73−$222.6K−10.1%58.6K after2 lots10b5-1
Sep 15, 2026 (view filing)4:08 PM ETSep 114 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−8.58K$32.02−$274.9K−28.6%21.5K after2 lots10b5-1
Sep 15, 2026 (view filing)4:08 PM ETSep 114 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−5.93K$32.02−$190.0K−32.6%12.3K after4 lots10b5-1
Sep 3, 2026 (view filing)4:07 PM ETSep 12 daysOelschlager Kristen MChief Operating OfficerSSale−4.15K$33.39−$138.6K−23.7%13.4K after2 lots10b5-1
Sep 2, 2026 (view filing)4:07 PM ETAug 312 daysJuvenal Tobin WChief Commercial OfficerSSale−1.73K$32.81−$56.8K−2.6%65.2K after10b5-1
Sep 1, 2026 (view filing)4:12 PM ETAug 284 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−12.4K$33.20−$412.6K−36.7%21.5K after2 lots10b5-1
Sep 1, 2026 (view filing)4:12 PM ETAug 284 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.13K$33.20−$203.6K−35.3%11.3K after12 lots10b5-1
Aug 27, 2026 (view filing)4:38 PM ETAug 252 daysJuvenal Tobin WChief Commercial OfficerSSale−9.05K$35.04−$317.1K−11.9%66.9K after10b5-1
Aug 26, 2026 (view filing)4:16 PM ETAug 24-252 daysOelschlager Kristen MChief Operating OfficerSSale−24.6K$34.06−$837.9K−25.3%72.6K after3 lots
Aug 19, 2026 (view filing)4:11 PM ETAug 172 daysJuvenal Tobin WChief Commercial OfficerSSale−1.73K$29.59−$51.2K−2.2%76.0K after10b5-1
Aug 18, 2026 (view filing)4:10 PM ETAug 144 daysStokes FrankChief Financial OfficerSSale−24.9K$29.77−$741.5K−41.5%35.2K after
Aug 18, 2026 (view filing)4:09 PM ETAug 144 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−1.10K$30.02−$33.0K−4.9%21.5K after10b5-1
Aug 18, 2026 (view filing)4:09 PM ETAug 144 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.13K$30.02−$184.1K−34.7%11.5K after6 lots10b5-1
Aug 6, 2026 (view filing)4:14 PM ETNov 24, 2025255 daysLateJuvenal Tobin WChief Commercial OfficerSSale−1.30K$38.39−$49.9K−1.6%77.7K after10b5-1
Aug 6, 2026 (view filing)4:14 PM ETAug 4-52 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−22.9K$31.06−$711.4K−51.6%21.5K after3 lots10b5-1
Aug 6, 2026 (view filing)4:14 PM ETAug 4-52 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−16.1K$31.08−$500.9K−45.1%19.6K after6 lots10b5-1
Aug 5, 2026 (view filing)4:18 PM ETAug 32 daysOelschlager Kristen MChief Operating OfficerSSale−8.59K$29.77−$255.6K−39.3%13.3K after3 lots10b5-1
Aug 4, 2026 (view filing)4:36 PM ETJul 31-Aug 34 daysJuvenal Tobin WChief Commercial OfficerSSale−19.0K$29.21−$556.2K−19.4%79.0K after4 lots10b5-1
Aug 4, 2026 (view filing)4:35 PM ETJul 31-Aug 34 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−17.1K$30.28−$519.1K−44.4%21.5K after2 lots10b5-1
Aug 4, 2026 (view filing)4:35 PM ETJul 31-Aug 34 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−11.5K$30.29−$348.4K−29.9%27.0K after4 lots10b5-1
Jul 29, 2026 (view filing)4:09 PM ETJul 272 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.21K$24.16−$150.2K−22.4%21.5K after2 lots10b5-1
Jul 29, 2026 (view filing)4:09 PM ETJul 272 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$24.16−$87.5K−23.5%11.8K after12 lots10b5-1
Jul 16, 2026 (view filing)4:16 PM ETJul 142 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−550$22.92−$12.6K−2.5%21.5K after10b5-1
Jul 16, 2026 (view filing)4:16 PM ETJul 142 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$22.92−$83.0K−23.1%12.1K after6 lots10b5-1
Jul 6, 2026 (view filing)4:25 PM ETJul 15 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.21K$24.29−$150.9K−22.4%21.5K after10b5-1
Jul 6, 2026 (view filing)4:25 PM ETJul 15 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$24.29−$88.0K−22.7%12.4K after6 lots10b5-1
Jul 6, 2026 (view filing)4:24 PM ETJul 15 daysOelschlager Kristen MChief Operating OfficerSSale−8.59K$24.42−$209.7K−28.2%21.9K after2 lots10b5-1
Jun 18, 2026 (view filing)Jun 162 daysOelschlager Kristen MChief Operating OfficerSSale−8.59K$20.71−$177.8K−22.0%30.5K after10b5-1
Jun 17, 2026 (view filing)Jun 152 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−550$20.66−$11.4K−2.5%21.5K after10b5-1
Jun 17, 2026 (view filing)Jun 152 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$20.66−$74.8K−22.3%12.6K after6 lots10b5-1
Jun 3, 2026 (view filing)Jun 12 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.21K$20.86−$129.6K−22.4%21.5K after10b5-1
Jun 3, 2026 (view filing)Jun 12 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$20.86−$75.6K−68.5%1.67K after6 lots10b5-1
May 22, 2026 (view filing)May 20-212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−550$20.15−$11.1K−2.5%21.5K after2 lots10b5-1
May 22, 2026 (view filing)May 20-212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$20.15−$73.0K−65.1%1.95K after12 lots10b5-1
May 11, 2026 (view filing)May 74 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.21K$22.15−$137.7K−22.4%21.5K after2 lots10b5-1
May 11, 2026 (view filing)May 74 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$22.15−$80.2K−62.0%2.22K after12 lots10b5-1
Apr 23, 2026 (view filing)Apr 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−550$25.10−$13.8K−2.5%21.5K after10b5-1
Apr 23, 2026 (view filing)Apr 212 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$25.10−$90.9K−59.1%2.50K after6 lots10b5-1
Apr 8, 2026 (view filing)Apr 62 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−6.21K$25.03−$155.5K−22.4%21.5K after10b5-1
Apr 8, 2026 (view filing)Apr 62 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$25.03−$90.7K−56.6%2.78K after6 lots10b5-1
Mar 30, 2026 (view filing)Mar 264 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−550$25.55−$14.1K−2.5%21.5K after10b5-1
Mar 30, 2026 (view filing)Mar 264 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.62K$25.55−$92.5K−54.2%3.06K after6 lots10b5-1
Mar 19, 2026 (view filing)Mar 17-182 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−19.3K$25.91−$500.1K−47.3%21.5K after2 lots10b5-1
Mar 17, 2026 (view filing)Mar 13-164 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−30.8K$25.74−$792.4K−43.0%40.8K after3 lots10b5-1
Mar 16, 2026 (view filing)Mar 124 daysJuvenal Tobin WChief Commercial OfficerSSale−20.9K$25.24−$526.6K−19.4%86.8K after10b5-1
Mar 13, 2026 (view filing)Mar 11-122 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−40.5K$25.63−$1.04M−36.1%71.6K after2 lots10b5-1
Mar 13, 2026 (view filing)Mar 112 daysMaetzold Derek JPres. & Chief Exec. OfficerSSale−3.64K$26.11−$94.9K−52.2%3.34K after6 lots10b5-1
Mar 9, 2026 (view filing)Mar 54 daysStokes FrankChief Financial OfficerSSale−6.00K$27.98−$167.9K−9.1%60.1K after10b5-1