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
DEF 14A

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

Proxy Filings
DEF 14A

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

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
DEF 14A

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

Proxy Filings
EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
DEFA14A

Additional proxy soliciting materials - definitive

Proxy Filings
DEFA14A

Additional proxy soliciting materials - definitive

Proxy Filings
DEFA14A

Additional proxy soliciting materials - definitive

Proxy Filings
EFFECT

EFFECT

Other
EFFECT

EFFECT

Other