KOP Koppers Holdings Inc.

NYSE

$45.19

Koppers Holdings Inc. (KOP) SEC Filings

Everything KOP has filed with the SEC, newest first. An 8-K shows what it was about where we have classified it — an earnings release and a change of chief executive are both 8-Ks, and the form number alone doesn't separate them.

90 filings
Date	Form	Filing
Sep 15, 2026	4	View filing
Sep 15, 2026	4	View filing
Sep 15, 2026	4	View filing
Sep 15, 2026	4	View filing
Sep 1, 2026	4	View filing
Aug 20, 2026	4	View filing
Aug 13, 2026	4	View filing
Aug 12, 2026	4	View filing
Aug 11, 2026	4	View filing
Aug 11, 2026	4	View filing
Aug 6, 2026	10-Q	View filing
Jun 23, 2026	4	View filing
Jun 17, 2026	4	View filing
Jun 17, 2026	4	View filing
Jun 17, 2026	4	View filing
Jun 17, 2026	4	View filing
Jun 15, 2026	4	View filing
Jun 4, 2026	4	View filing
May 27, 2026	4	View filing
May 14, 2026	4	View filing
May 14, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 11, 2026	4	View filing
May 8, 2026	10-Q	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 25, 2026	4	View filing
Mar 18, 2026	4	View filing
Mar 4, 2026	4	View filing
Mar 3, 2026	4/A	View filing
Mar 2, 2026	4	View filing
Mar 2, 2026	4	View filing
Mar 2, 2026	4	View filing
Mar 2, 2026	4	View filing
Mar 2, 2026	4	View filing
Mar 2, 2026	4	View filing
Feb 26, 2026	10-K	View filing
Feb 19, 2026	4	View filing
Feb 12, 2026	4	View filing
Jan 6, 2026	4	View filing
Jan 6, 2026	4	View filing
Jan 6, 2026	4	View filing
Jan 6, 2026	4	View filing
Jan 6, 2026	4	View filing
Jan 6, 2026	4	View filing
Jan 6, 2026	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Dec 17, 2025	4	View filing
Nov 7, 2025	4	View filing
Nov 7, 2025	10-Q	View filing
Sep 17, 2025	4	View filing
Sep 17, 2025	4	View filing
Sep 17, 2025	4	View filing
Sep 17, 2025	4	View filing
Aug 8, 2025	10-Q	View filing
May 9, 2025	10-Q	View filing
Feb 27, 2025	10-K	View filing
Nov 8, 2024	10-Q	View filing
Aug 8, 2024	10-Q	View filing
May 3, 2024	10-Q	View filing
Feb 28, 2024	10-K	View filing
Nov 3, 2023	10-Q	View filing
Aug 3, 2023	10-Q	View filing
May 5, 2023	10-Q	View filing
Feb 27, 2023	10-K	View filing
Nov 4, 2022	10-Q	View filing
Aug 4, 2022	10-Q	View filing
May 6, 2022	10-Q	View filing
Feb 23, 2022	10-K	View filing
Nov 4, 2021	10-Q	View filing

Filings are sourced from EDGAR and open on the SEC's own site. Classification of 8-K events is ours and is not part of the filing.