Koppers Highlights Sustainability Achievements Including Notable Greenhouse Gas Reduction

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
DEFA14A

Additional proxy soliciting materials - definitive

Proxy Filings
DEFA14A

Additional proxy soliciting materials - definitive

Proxy Filings
DEF 14A

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

Proxy Filings
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5