MAETZOLD DEREK J bought CSTL
August 3, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 10,664 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $25.5K. The trade was recorded as option exercise under a pre-scheduled Rule 10b5-1 plan and disclosed on an SEC Form 4, filed 1 day after the transaction.
Direction
Acquired (buy-side)
Shares
10,664
Price
$2.39
Total value
$25.5K
InsiderMAETZOLD DEREK J
Role—
SecurityCommon Stock
Transaction codeM: Option exercise
Transaction dateAugust 3, 2026
Filing dateAugust 4, 2026
Shares owned after32,143
OwnershipDirect
10b5-1 planYes
AmendedNo
Footnotes
These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on December 3, 2025.