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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
2026-09-11 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −8,584 16,745
2026-09-01 Oelschlager Kristen M Chief Operating Officer Option exercise 10b5-1 +4,152 $3.38 $14K 17,508
2026-09-01 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −3,952 $33.36 $132K 13,556
2026-09-01 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −200 $34.02 $7K 13,356
2026-09-01 Oelschlager Kristen M Chief Operating Officer Option exercise · Stock option (right to buy) 10b5-1 −4,152 12,458
2026-08-31 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −1,730 $32.81 $57K 65,184
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +12,428 $2.39 $30K 33,907
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −11,472 $33.14 $380K 22,435
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,505 $33.14 $83K 17,850
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,129 $33.14 $71K 15,172
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −257 $33.14 $9K 11,277
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −257 $33.14 $9K 11,277
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −257 $33.14 $9K 11,277
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −257 $33.14 $9K 11,277
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −956 $33.88 $32K 21,479
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −209 $33.88 $7K 17,641
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −177 $33.88 $6K 14,995
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −21 $33.88 $711 11,256
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −21 $33.88 $711 11,256
2026-08-28 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −21 $33.88 $711 11,256

Page 3 of 45 · 897 trades