Company Story
1988 - Koppers Holdings Inc. was founded as a subsidiary of Koppers Company, Inc.
2006 - Koppers Holdings Inc. became an independent company after a spin-off from Koppers Company, Inc.
2008 - Koppers Holdings Inc. acquired the wood preservation business of Osmose Holdings, Inc.
2010 - Koppers Holdings Inc. acquired the railroad tie business of Portec Rail Products, Inc.
2014 - Koppers Holdings Inc. acquired the wood preservation business of Tolko.
2018 - Koppers Holdings Inc. acquired the wood preservation business of Cox Industries, Inc.
2020 - Koppers Holdings Inc. acquired the wood preservation business of Hurricane Treated Wood Products, LLC.