Fifth Consecutive Year of Recognition and Highest Ranking EverPITTSBURGH, Dec. 18, 2024 /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of treated wood products, wood treatment chemicals and carbon compounds, has been named to America's Most Responsible Companies 2025 list by Newsweek magazine for the fifth consecutive year. Koppers achieved its highest placement ever, ranking No. 113 out of 600 finalists and No. 9 out of 56 in the Materials & Chemicals category."Koppers is ...