PITTSBURGH, Oct. 24, 2025 /PRNewswire/ -- Koppers Holdings Inc. (NYSE:KOP), an integrated global provider of treated wood products, wood treatment chemicals, and carbon compounds, today announced that the company plans to release its financial results for the third quarter 2025 before the market opens on Friday, November 7, 2025, and discuss its outlook on a conference call later that day at 11:00 a.m. Eastern Time. Presentation materials will be available at least 15 minutes before the call on www.koppers.com in the Investor Relations section of the company's website.

Interested parties may access the live audio broadcast toll free by dialing 833-366-1128 in the United States and Canada, or 412-902-6774 for international, Conference ID number 10196739. Participants are requested to access the call at least five minutes before the scheduled start time to complete a brief registration. The conference call will be broadcast live on www.koppers.com and can also be accessed here.

An audio replay will be available approximately two hours after the completion of the call at 877-344-7529 for U.S. toll free, 855-669-9658 for Canada toll free, or 412-317-0088 for international, using replay access code 1342424. The recording will be available for replay through February 07, 2026.

About Koppers

Koppers (NYSE:KOP) is an integrated global provider of essential treated wood products, wood preservation technologies and carbon compounds. Our team of 2,000 employees create, protect and preserve key elements of our global infrastructure – including railroad crossties, utility poles, outdoor wooden structures, and production feedstocks for steel, aluminum and construction materials, among others – applying decades of industry-leading expertise while constantly innovating to anticipate the needs of tomorrow. Together we are providing safe and sustainable solutions to enable rail transportation, keep power flowing, and create spaces of enjoyment for people everywhere. Protecting What Matters, Preserving The Future. Learn more at Koppers.com.

Inquiries from the media should be directed to Ms. Jessica Franklin Black at BlackJF@koppers.com or 412-227-2025. Inquiries from the investment community should be directed to Ms. Quynh McGuire at McGuireQT@koppers.com or 412-227-2049.

For Information: Quynh McGuire, Vice President, Investor Relations

412 227 2049

McGuireQT@koppers.com

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SOURCE KOPPERS HOLDINGS INC.

Koppers Holdings Inc. Schedules Third Quarter 2025 Conference Call