Arkolith/Insider Trading/CSTL/Form 4

Maetzold Derek J

Pres. & Chief Exec. Officer, DirectorCASTLE BIOSCIENCES INC (CSTL) · full profile →Form 4 · filed Sep 1, 2026
Net Selling
Open-Market Buys
$0
Open-Market Sells
$616K
Net Open-Market Flow
-$616K
Transactions
16
15 non-derivative · 1 derivative

Non-Derivative Transactions (Table I)

DateActionSharesPriceValueOwned After
Aug 28, 2026Option exercise(M)12K$2.39$30K34K
Aug 28, 2026Sell(S)11K$33.14$380K22K
Aug 28, 2026Sell(S)3K$33.14$83K18K
Aug 28, 2026Sell(S)2K$33.14$71K15K
Aug 28, 2026Sell(S)257$33.14$9K11K
Aug 28, 2026Sell(S)257$33.14$9K11K
Aug 28, 2026Sell(S)257$33.14$9K11K
Aug 28, 2026Sell(S)257$33.14$9K11K
Aug 28, 2026Sell(S)956$33.88$32K21K
Aug 28, 2026Sell(S)209$33.88$7K18K
Aug 28, 2026Sell(S)177$33.88$6K15K
Aug 28, 2026Sell(S)21$33.88$71111K
Aug 28, 2026Sell(S)21$33.88$71111K
Aug 28, 2026Sell(S)21$33.88$71111K
Aug 28, 2026Sell(S)21$33.88$71111K

Derivative Transactions (Table II)

DateActionSharesPriceValueOwned After
Aug 28, 2026Option exercise(M)12K—$025K

Transaction Codes

M
Option exercise / conversion
S
Open-market sale

Data Source & Provenance

Parsed from a single SEC EDGAR Form 4 filing (accession 0001628280-26-059816) 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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