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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
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −550 $25.55 $14K 21,479
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,357 $25.55 $35K 50,209
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,153 $25.55 $29K 42,673
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $25.55 $7K 3,058
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $25.55 $7K 3,058
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $25.55 $7K 3,058
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −278 $25.55 $7K 3,058
2026-03-26 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −550 13,732
2026-03-26 Cotton Rodney Director Option exercise +5,329 19,331
2026-03-26 Cotton Rodney Director Option exercise · Restricted Stock Units −5,329 5,330
2026-03-18 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −650 $25.39 $17K 21,479
2026-03-17 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −18,650 $25.93 $484K 22,129
2026-03-16 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −17,449 $25.96 $453K 40,905
2026-03-16 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −126 $26.68 $3K 40,779
2026-03-13 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −13,204 $25.45 $336K 58,354
2026-03-12 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −20,863 $25.24 $527K 86,825
2026-03-12 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −23,179 $25.28 $586K 71,558
2026-03-11 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +6,226 $2.39 $15K 112,047
2026-03-11 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −17,310 $26.11 $452K 94,737
2026-03-11 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −1,357 $26.11 $35K 51,566

Page 13 of 45 · 897 trades