MAETZOLD DEREK J bought CSTL
May 7, 2026 · Form 4 insider transaction
MAETZOLD DEREK J bought 6,214 shares of Castle Biosciences, Inc. at $2.39 per share, a transaction worth $14.9K. 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
6,214
Price
$2.39
Total value
$14.9K
InsiderMAETZOLD DEREK J
Role—
SecurityCommon Stock
Transaction codeM: Option exercise
Transaction dateMay 7, 2026
Filing dateMay 11, 2026
Shares owned after27,693
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.