MAETZOLD DEREK J bought CSTL
August 28, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 12,428 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $29.7K. The trade was recorded as option exercise under a pre-scheduled Rule 10b5-1 plan and disclosed on an SEC Form 4, filed 4 days after the transaction.
Direction
Acquired (buy-side)
Shares
12,428
Price
$2.39
Total value
$29.7K
InsiderMAETZOLD DEREK J
Role—
SecurityCommon Stock
Transaction codeM: Option exercise
Transaction dateAugust 28, 2026
Filing dateSeptember 1, 2026
Shares owned after33,907
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.