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CIK 0001447362 · Accelerated filer

CASTLE BIOSCIENCES INC

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Ticker
CSTL
Exchange
Nasdaq
Industry
Services-Medical Laboratories
FY end
Dec 31
Incorporated
DE
Entity type
operating
EIN
770701774
Phone
866-788-9007
Business address
1500 W. PARKWOOD AVE., SUITE 400, FRIENDSWOOD, TX, 77546
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$5,765,795
in 18 filings, $4.9M under 10b5-1 plans

Net −$5,765,795. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. MAETZOLD DEREK J −$3.1M Pres. & Chief Exec. Officer sold 98% of stake
  2. Juvenal Tobin W −$1.5M Chief Commercial Officer sold 58% of stake
  3. Oelschlager Kristen M −$1.1M Chief Operating Officer sold 71% of stake

Reading 100 more Form 4s from the SEC; this list fills in as they're read.

Date Insider Transaction Shares Price Value Owned after
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −6,214 85,667
2026-07-01 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −8,186 $24.40 $200K 22,274
2026-07-01 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −400 $24.78 $10K 21,874
2026-06-16 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −8,587 $20.71 $178K 30,460
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +550 $2.39 $1K 22,029
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −550 $20.66 $11K 21,479
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,357 $20.66 $28K 42,067
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,153 $20.66 $24K 35,755
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $20.66 $6K 12,646
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $20.66 $6K 12,646
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $20.66 $6K 12,646
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $20.66 $6K 12,646
2026-06-15 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −550 91,881
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +204 $2.39 $488 21,683
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +6,010 $2.39 $14K 27,693
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −6,214 $20.86 $130K 21,479
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,357 $20.86 $28K 43,424
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,153 $20.86 $24K 36,908
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $20.86 $6K 1,668
2026-06-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $20.86 $6K 1,668

Page 8 of 45 · 897 trades