Koppers expands board to nine, elects Laura Posadas as director

Koppers Holdings Inc.

Board increased from eight to nine directors; Laura Posadas elected effective Nov 5, 2025.
Posadas is CEO of Canlak Coatings (wood coating systems), with 20+ years specialty chemicals experience.
Board determined she is independent under NYSE rules; committees not yet assigned.
Will stand for election at 2026 annual meeting; compensation per standard non-employee director plan.
No reportable transactions or arrangements with company; no material relationships.

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