MAETZOLD DEREK J bought CSTL
September 21, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 8,580 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $20.5K. The trade was recorded as option exercise under a pre-scheduled Rule 10b5-1 plan and disclosed on an SEC Form 4, filed 2 days after the transaction.
Direction
Acquired (buy-side)
Shares
8,580
Price
$2.39
Total value
$20.5K
InsiderMAETZOLD DEREK J
Role—
SecurityCommon Stock
Transaction codeM: Option exercise
Transaction dateSeptember 21, 2026
Filing dateSeptember 23, 2026
Shares owned after30,059
OwnershipDirect
10b5-1 planYes
AmendedNo
Footnotes
These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on June 2, 2026.