Koppers Reports Achievements in Safety, Sustainability and Financial Performance

SEC Filings
Filing date Form Description Filing Group View
PRE 14A

A preliminary proxy statement providing notification matters to be brought to a vote

Proxy Filings
PRE 14A

A preliminary proxy statement providing notification matters to be brought to a vote

Proxy Filings
PRE 14A

A preliminary proxy statement providing notification matters to be brought to a vote

Proxy Filings
EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other
SC 13G

A statement of beneficial ownership of common stock by certain persons

Other