MAETZOLD DEREK J bought CSTL
May 20, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 130 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $310.70. 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
130
Price
$2.39
Total value
$310.70
InsiderMAETZOLD DEREK J
Role—
SecurityCommon Stock
Transaction codeM: Option exercise
Transaction dateMay 20, 2026
Filing dateMay 22, 2026
Shares owned after21,609
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.