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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
2026-08-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −473 $30.68 $15K 19,607
2026-08-05 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −2,546 38,857
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +20,356 $2.39 $49K 41,835
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −8,421 $30.79 $259K 33,414
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −3,374 $30.79 $104K 28,407
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −2,866 $30.79 $88K 24,143
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −11,935 $31.34 $374K 21,479
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −4,782 $31.34 $150K 23,625
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −4,063 $31.34 $127K 20,080
2026-08-04 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −20,356 41,403
2026-08-03 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −3,000 $29.12 $87K 18,874
2026-08-03 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −4,486 $30.00 $135K 14,388
2026-08-03 Oelschlager Kristen M Chief Operating Officer Sale 10b5-1 −1,100 $30.62 $34K 13,288
2026-08-03 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −1,730 $28.25 $49K 78,995
2026-08-03 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise 10b5-1 +10,664 $2.39 $25K 32,143
2026-08-03 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −10,664 $30.35 $324K 21,479
2026-08-03 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −4,232 $30.35 $128K 31,781
2026-08-03 MAETZOLD DEREK J Pres. & Chief Exec. Officer Sale 10b5-1 −3,597 $30.35 $109K 27,009
2026-08-03 MAETZOLD DEREK J Pres. & Chief Exec. Officer Option exercise · Stock option (right to buy) 10b5-1 −10,664 61,759
2026-07-31 Juvenal Tobin W Chief Commercial Officer Sale 10b5-1 −8,149 $28.84 $235K 89,886

Page 5 of 45 · 897 trades