Koppers Has Released Our 2024 Corporate Sustainability Report!

SEC Filings
Filing date Form Description Filing Group View
SCHEDULE 13G/A SCHEDULE 13G/A - Description
Other
SCHEDULE 13G SCHEDULE 13G - Description
Other
SCHEDULE 13G/A SCHEDULE 13G/A - Description
Other
4 Statement of changes in beneficial ownership of securities
3,4,5
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
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