Koppers Holdings Inc. will host an Investor Day beginning at 9 a.m. Eastern Time on Thursday, September 17, 2026, in Atlanta, Georgia. The company’s management team will hold an in-person tour of its Performance Chemicals business and research and development center in nearby Peachtree City on September 16. The management presentation will take place at the Kimpton Overland Atlanta Airport and will be webcast live with video, audio and presentation slides. Virtual attendees may participate in the question-and-answer session, while presentation materials will be posted at least 15 minutes before the webcast. An archived version will be available after the event. Koppers is an integrated global provider of treated wood products, wood preservation technologies and carbon compounds, with approximately 1,800 employees.