OTHER INFORMATION
−Removed: During the three months ended September 30, 2024 , none of our directors or executive officers adopted or terminated any Rule 10b5-1 trading arrangement or any non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K).
+Added: During the three months ended March 31, 2025 , none of our directors or executive officers adopted , modified or terminated any Rule 10b5-1 trading arrangement or any non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K).
+Added: Annual Incentive Plan, as amended and restated effective February 12, 2025.
+Added: Koppers Holdings Inc.
+Added: Amended and Restated 2020 Long Term Incentive Plan (Incorporated herein by reference to Exhibit 99.1 to the Registration Statement on Form S-8 filed on May 9, 2025 by Koppers Holdings Inc.
Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
8 unchanged sentences
(R EGISTRANT )
−Removed: November 8, 2024
/s/ J immi S ue S mith
3 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.