January 5, 2026 · Form 4 insider transaction
Apostolou Stephanie L sold 5,757 shares of KOPPERS HOLDINGS INC at $26.93 per share, a transaction worth $155.0K. The trade was recorded as shares withheld for taxes and disclosed on an SEC Form 4, filed 1 day after the transaction.
Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of RSUs and performance share units ("PSUs").