Investor Relations

Customers come back to Koppers because they know they can depend on us for quality, timeliness and attention to detail.

SEC Filings

Filing date Form Description Filing Group View
DEFA14A

Additional proxy soliciting materials - definitive

Proxy Filings
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
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
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