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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
$6,517,887
in 19 filings, $4.9M under 10b5-1 plans

Net −$6,517,887. 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 −$3.3M Pres. & Chief Exec. Officer sold 99% of stake
  2. Juvenal Tobin W −$1.3M Chief Commercial Officer sold 50% of stake
  3. Oelschlager Kristen M −$1.1M Chief Operating Officer sold 71% of stake
  4. Stokes Frank −$742K Chief Financial Officer sold 41% 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
2026-11-02 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −7,555 $36.01 $272K 4,929
2026-11-02 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,816 $36.01 $101K 2,024
2026-11-02 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,393 $36.01 $86K 1,721
2026-11-02 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,025 $36.81 $38K 3,904
2026-11-02 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −382 $36.81 $14K 1,642
2026-11-02 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −325 $36.81 $12K 1,396
2026-10-28 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −1,237 $35.58 $44K 44,194
2026-10-28 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −5,341 $36.62 $196K 38,853
2026-10-26 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −3,288 $33.08 $109K 45,431
2026-10-19 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −8,580 $31.91 $274K 12,484
2026-10-19 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −3,198 $31.91 $102K 4,840
2026-10-19 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,718 $31.91 $87K 4,114
2026-10-12 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −3,288 $33.64 $111K 48,719
2026-10-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +8,165 $2.39 $20K 29,644
2026-10-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −8,580 $35.57 $305K 21,064
2026-10-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −3,198 $35.57 $114K 8,038
2026-10-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,718 $35.57 $97K 6,832
2026-10-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −8,165 0
2026-10-01 Oelschlager Kristen M Chief Operating Officer Option exercise 10b5-1 +4,153 $3.38 $14K 17,509
2026-10-01 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −2,807 $35.75 $100K 14,702

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