0000921895-26-002844 | SCHEDULE 13D/A | Koppers Holdings, Inc.

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SCHEDULE 13D/A

Filing Date

Oct 22, 2026

Document Date

Oct 22, 2026

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SCHEDULE 13D/A - Description

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Other

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Koppers Holdings, Inc.

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Koppers Holdings Inc.

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436 Seventh Avenue

Pittsburgh, PA 15219-1800

+1 412.227.2001

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Who We Are What We Do Our Leadership Zero Harm Our Locations In the Community Newsroom

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Wood Enhancement Technologies Railroad Utility & Industrial Carbon & Coating Solutions CPRO™ for Advanced Battery Anode Materials

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Railroad Structures Recovery & Reuse Utility Services Research & Innovation Carbon Material Testing

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People Planet Performance Sustainability Reports

436 Seventh Avenue

Pittsburgh, PA 15219-1800

+1 412.227.2001

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