• Koppers: CEO and director M. Leroy Ball sold 3,412 common shares on June 18, 2026 at USD 43.9.
• Post-transaction direct stake: 436,243 shares.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Koppers Holdings Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001229771-26-000016), on June 23, 2026, and is solely responsible for the information contained therein.