Apostolou Stephanie L 4

What Happened
Stephanie L. Apostolou, Chief Legal & Sustainability Officer and Secretary of Koppers Holdings, had performance-based awards vest on Feb 26, 2026 and received shares as a result. The filing shows she was credited with 7,223 shares from vested PSUs and an additional 174 shares tied to dividend-equivalent rights (DERs) (total = 7,397 shares acquired at $0). To satisfy tax withholding on the vesting, she surrendered 3,149 shares to the issuer (disposed) at an imputed value of $37.24 per share for a tax withholding amount of $117,269. The filing also lists derivative conversion entries (code M) tied to the DERs.

Key Details

• Transaction date: February 26, 2026; Form 4 filed March 2, 2026 (filed within the typical two-business-day window).
• Awards/acquisitions: 7,223 shares (PSUs) + 174 DER-related shares acquired at $0.
• Disposition for tax withholding: 3,149 shares surrendered at $37.24 each = $117,269.
• Transaction codes: A = award/grant; M = exercise/conversion of a derivative; F = shares surrendered for tax withholding.
• Shares owned after transaction: Not stated in the Form 4 filing.
• Footnotes: PSUs were granted Jan 4, 2023 and performance conditions for the 2023–2025 measurement period were met; DERs are economic equivalents to shares and were released on vesting; shares were surrendered specifically to cover tax withholding.

Context
This was primarily an award vesting and tax-withholding event — not an open-market sale. The reported dispositions were shares surrendered to the company to satisfy tax obligations on vested PSUs (a routine administrative action). The derivative entries reflect conversion/release of DERs related to the vested PSUs. Such internal tax-withholding surrenders generally do not indicate a change in the insider’s investment view of the company.