Arkolith/Insider Trading/CSTL/Form 4

Maetzold Derek J

Pres. & Chief Exec. Officer, DirectorCASTLE BIOSCIENCES INC (CSTL) · full profile →Form 4 · filed Aug 18, 2026
Net Selling
Open-Market Buys
$0
Open-Market Sells
$217K
Net Open-Market Flow
-$217K
Transactions
9
8 non-derivative · 1 derivative

Non-Derivative Transactions (Table I)

DateActionSharesPriceValueOwned After
Aug 14, 2026Option exercise(M)1K$2.39$3K23K
Aug 14, 2026Sell(S)1K$30.02$33K21K
Aug 14, 2026Sell(S)3K$30.02$81K20K
Aug 14, 2026Sell(S)2K$30.02$69K17K
Aug 14, 2026Sell(S)278$30.02$8K12K
Aug 14, 2026Sell(S)278$30.02$8K12K
Aug 14, 2026Sell(S)278$30.02$8K12K
Aug 14, 2026Sell(S)278$30.02$8K12K

Derivative Transactions (Table II)

DateActionSharesPriceValueOwned After
Aug 14, 2026Option exercise(M)1K—$038K

Transaction Codes

M
Option exercise / conversion
S
Open-market sale

Data Source & Provenance

Parsed from a single SEC EDGAR Form 4 filing (accession 0001628280-26-057642) within minutes of acceptance. Every field above traces to the original document. Verify it directly:

View original filing on SEC.govRaw Form 4 XML

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