Koppers Holdings Inc. - KOP
All tracked SEC files for this issuer. Showing up to 200 latest records.
Need parsed ownership details (13D/13G with shares/percent)?
Open ownership details
Form 4 = insider transactions report. Form 144 = notice of proposed sale (not a completed trade confirmation).
Files summary
Total files loaded: 47
Latest filed: Mar 27, 2026
| Form | Count |
|---|---|
| 4 | 37 |
| 8-K | 4 |
| SCHEDULE 13G/A | 2 |
| 8-K/A | 2 |
| 4/A | 1 |
| 144 | 1 |
Latest files
| Filed | Form | Report period | Accession | SEC |
|---|---|---|---|---|
| Mar 27, 2026 | SCHEDULE 13G/A | — | 0000102909-26-001632 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001739998-26-000002 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001190210-26-000002 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001315257-26-000022 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001315257-26-000024 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001533627-26-000002 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001584601-26-000004 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0002092070-26-000002 | View |
| Mar 25, 2026 | 4 | Mar 23, 2026 | 0001564614-26-000002 | View |
| Mar 18, 2026 | 8-K/A | Jan 05, 2026 | 0001315257-26-000017 | View |
| Mar 18, 2026 | 4 | Mar 17, 2026 | 0001229771-26-000008 | View |
| Mar 04, 2026 | 4 | Mar 02, 2026 | 0001229771-26-000006 | View |
| Mar 03, 2026 | 4/A | Feb 26, 2026 | 0001919175-26-000006 | View |
| Mar 02, 2026 | 144 | — | 0001959173-26-001645 | View |
| Mar 02, 2026 | 4 | Feb 26, 2026 | 0001776180-26-000004 | View |
| Mar 02, 2026 | 4 | Feb 26, 2026 | 0002057699-26-000004 | View |
| Mar 02, 2026 | 4 | Feb 26, 2002 | 0001919175-26-000004 | View |
| Mar 02, 2026 | 4 | Feb 26, 2026 | 0001450800-26-000004 | View |
| Mar 02, 2026 | 4 | Feb 26, 2026 | 0001315257-26-000014 | View |
| Mar 02, 2026 | 4 | Feb 26, 2026 | 0001229771-26-000004 | View |
| Feb 26, 2026 | 8-K | Feb 26, 2026 | 0001315257-26-000010 | View |
| Feb 19, 2026 | 4 | Feb 18, 2026 | 0001229771-26-000002 | View |
| Feb 12, 2026 | 4 | Feb 10, 2026 | 0001315257-26-000006 | View |
| Jan 09, 2026 | 8-K | Jan 05, 2026 | 0001315257-26-000004 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0001776180-26-000002 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0001806249-26-000002 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0001315257-26-000002 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0002057699-26-000002 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0001919175-26-000002 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0001684691-26-000002 | View |
| Jan 06, 2026 | 4 | Jan 02, 2026 | 0001450800-26-000002 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001315257-25-000015 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001463649-25-000005 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001739998-25-000007 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001584601-25-000006 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001684691-25-000005 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001776180-25-000003 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001919175-25-000003 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0002057699-25-000003 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001450800-25-000004 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001806249-25-000003 | View |
| Dec 17, 2025 | 4 | Dec 16, 2025 | 0001229771-25-000003 | View |
| Dec 03, 2025 | 8-K/A | Nov 08, 2024 | 0001315257-25-000014 | View |
| Nov 07, 2025 | 8-K | Nov 07, 2025 | 0001315257-25-000010 | View |
| Nov 07, 2025 | 4 | Nov 05, 2025 | 0002092070-25-000004 | View |
| Nov 05, 2025 | 8-K | Nov 05, 2025 | 0001315257-25-000006 | View |
| Oct 31, 2025 | SCHEDULE 13G/A | — | 0000102909-25-000256 | View |