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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
2026-07-27 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −10 $25.06 $251 11,812
2026-07-27 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −10 $25.06 $251 11,812
2026-07-27 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −6,214 78,903
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +550 $2.39 $1K 22,029
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −550 $22.92 $13K 21,479
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,357 $22.92 $31K 39,353
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,153 $22.92 $26K 33,449
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $22.92 $6K 12,090
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $22.92 $6K 12,090
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $22.92 $6K 12,090
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $22.92 $6K 12,090
2026-07-14 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −550 85,117
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +6,214 $2.39 $15K 27,693
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −6,214 $24.29 $151K 21,479
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,357 $24.29 $33K 40,710
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,153 $24.29 $28K 34,602
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $24.29 $7K 12,368
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $24.29 $7K 12,368
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $24.29 $7K 12,368
2026-07-01 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $24.29 $7K 12,368

Page 7 of 45 · 897 trades