MAETZOLD DEREK J bought CSTL
October 5, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 8,165 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $19.5K. 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
8,165
Price
$2.39
Total value
$19.5K
InsiderMAETZOLD DEREK J
Role—
SecurityCommon Stock
Transaction codeM: Option exercise
Transaction dateOctober 5, 2026
Filing dateOctober 7, 2026
Shares owned after29,644
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.