Koppers Reports Achievements in Safety, Sustainability and Financial Performance

SEC Filings
Filing date Form Description Filing Group View
8-K/A

Amendment to a previously filed 8-K

Current Reports
8-K/A

Amendment to a previously filed 8-K

Current Reports
8-K/A

Amendment to a previously filed 8-K

Current Reports
EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
3/A

An amendment to a 3 filing. Non-EDGAR filing

3,4,5
3/A

An amendment to a 3 filing. Non-EDGAR filing

3,4,5
3/A

An amendment to a 3 filing. Non-EDGAR filing

3,4,5
3/A

An amendment to a 3 filing. Non-EDGAR filing

3,4,5
3/A

An amendment to a 3 filing. Non-EDGAR filing

3,4,5
SC 13G/A

An amendment to the SC 13G filing

Other
SC 13G/A

An amendment to the SC 13G filing

Other