Koppers Holdings Inc. KOP

What this company does

Koppers Holdings Inc. provides treated wood products, wood preservation chemicals and carbon compounds used in a range of end-markets, including the railroad, specialty chemical, utility, residential lumber, agriculture, aluminum, steel, rubber and construction industries. As of December 31, 2025, the company had a total of 1,859 employees across its businesses, including administration. The company operates three principal business segments: Railroad and Utility Products and Services (RUPS), Performance Chemicals (PC) and Carbon Materials and Chemicals (CMC). The RUPS segment sells pressure-treated railroad ties to the railroad industry in the United States and Canada, and treated utility poles to utility markets in the United States and Australia. The PC segment supplies copper-based wood preservatives, including micronized copper azole, micronized pigments, alkaline copper quaternary, amine copper azole, DCOI and CCA, from sales and manufacturing operations in the United States, Canada, Europe, South America and Australasia. The CMC segment manufactures creosote, used in the treatment of wood or as a feedstock in the production of carbon black; carbon pitch, used in the production of aluminum and steel; and naphthalene, used as a surfactant in the production of concrete. Koppers Holdings Inc. was incorporated in November 2004 as a holding company for Koppers Inc.

Written from the business description in Koppers Holdings Inc.'s annual report to the U.S. Securities and Exchange Commission, filed 26 February 2026. Every sentence was checked against that document before publication.