Koppers filed an amended Form 8-K to update disclosures under Item 5.02 related to Jimmi Sue Smith’s retirement as chief financial officer effective Jan. 5, 2026. The amendment adds material terms of a transition agreement between Smith and a Koppers subsidiary, executed March 9, 2026 and effective March 17, 2026. Under the agreement, Smith is to receive USD 440,000 paid over the transition period and remain eligible for her earned and unpaid 2025 annual cash incentive, payable around April 4, 2026. Koppers also agreed to pay Smith USD 123,400 as a lump sum and USD 0.33 million in a lump sum around April 8, 2027, subject to her transition services.

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