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
DEF 14A

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

Proxy Filings
3

Initial filing by director officer or owner of more than ten percent.

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/A

Amendment to a previously filed 4

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
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