Koppers Holdings(KOP) - 2024 Q1 - Quarterly Results

Exhibit 99.1 FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 McGuireQT@koppers.com Koppers Reports First Quarter 2024 Results; Provides Updated 2024 Outlook Completed Acquisition of Brown Wood Preserving Company First Quarter Sales of $497.6 Million vs.$513.4 Million in Prior Year Quarter First Quarter Diluted EPS of $0.59 vs.$1.19 in Prior Year Quarter Adjusted EPS of $0.62 vs.$1.12 in Prior Year Quarter PITTSBURGH, May 3, 2024 – Koppers Holdings Inc ...