Koppers Reports Achievements in Safety, Sustainability and Financial Performance

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

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

Proxy Filings
EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
ARS

An annual report to security holders

Annual 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
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
4

Statement of changes in beneficial ownership of securities

3,4,5