Arkolith/Insider Trading/CSTL/Form 4

Maetzold Derek J

Pres. & Chief Exec. Officer, DirectorCASTLE BIOSCIENCES INC (CSTL) · full profile →Form 4 · filed May 22, 2026
Net Selling
Open-Market Buys
$0
Open-Market Sells
$84K
Net Open-Market Flow
-$84K
Transactions
18
16 non-derivative · 2 derivative

Non-Derivative Transactions (Table I)

DateActionSharesPriceValueOwned After
May 21, 2026Option exercise(M)420$2.39$1K22K
May 21, 2026Sell(S)420$20.20$8K21K
May 21, 2026Sell(S)1K$20.20$21K45K
May 21, 2026Sell(S)880$20.20$18K38K
May 21, 2026Sell(S)212$20.20$4K2K
May 21, 2026Sell(S)212$20.20$4K2K
May 21, 2026Sell(S)212$20.20$4K2K
May 21, 2026Sell(S)212$20.20$4K2K
May 20, 2026Option exercise(M)130$2.39$31122K
May 20, 2026Sell(S)130$20.00$3K21K
May 20, 2026Sell(S)322$20.00$6K46K
May 20, 2026Sell(S)273$20.00$5K39K
May 20, 2026Sell(S)66$20.00$1K2K
May 20, 2026Sell(S)66$20.00$1K2K
May 20, 2026Sell(S)66$20.00$1K2K
May 20, 2026Sell(S)66$20.00$1K2K

Derivative Transactions (Table II)

DateActionSharesPriceValueOwned After
May 21, 2026Option exercise(M)420—$0204
May 20, 2026Option exercise(M)130—$0624

Transaction Codes

M
Option exercise / conversion
S
Open-market sale

Data Source & Provenance

Parsed from a single SEC EDGAR Form 4 filing (accession 0001628280-26-037724) within minutes of acceptance. Every field above traces to the original document. Verify it directly:

View original filing on SEC.govRaw Form 4 XML