Koppers Holdings Inc. to Host Investor Day on September 17, 2026

PITTSBURGH, Aug. 31, 2026 /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of treated wood products, wood treatment chemicals and carbon compounds, today announced that it will host an Investor Day beginning at 9 a.m. Eastern Time on Thursday, September 17, 2026, in Atlanta, Georgia.

As part of the pre-event activities, on Wednesday, September 16, 2026, the company's management team will host an in-person tour of its Performance Chemicals business and research and development center located in nearby Peachtree City, Georgia.

The management presentation will take place on Thursday, September 17, at the Kimpton Overland Atlanta Airport and will also be available via webcast.  Attendance at the in-person presentation is by invitation only.  Investors and other interested parties who wish to view the presentation virtually may register here.

A live webcast of the management presentation, including video, audio and presentation slides, will be available on www.koppers.com during the event.  Virtual participants will also have the opportunity to participate in the question-and-answer session following the presentation.  Presentation materials will be available at least 15 minutes before the webcast on www.koppers.com in the Investor Relations section of the company's website.

For interested parties unable to attend the presentation in person or watch the live webcast, an archived version of the presentation will be available on www.koppers.com following the conclusion of the event.

About Koppers

Koppers (NYSE: KOP) is an integrated global provider of essential treated wood products, wood preservation technologies and carbon compounds.  Our team of approximately 1,800 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.

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SOURCE KOPPERS HOLDINGS INC.