Koppers Reports Achievements in Safety, Sustainability and Financial Performance

SEC Filings
Filing date Form Description Filing Group View
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
ARS

An annual report to security holders

Annual Filings
DEF 14A

Official notification to shareholders of matters to be brought to a vote ("Proxy")

Proxy Filings