Koppers Has Released our 2025 Annual Report!

SEC Filings
Filing date Form Description Filing Group View
SCHEDULE 13G/A SCHEDULE 13G/A - Description
Other
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