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: 56
Latest filed: Aug 20, 2026
| Form | Count |
|---|---|
| 4 | 39 |
| 144 | 5 |
| 8-K | 4 |
| SCHEDULE 13G/A | 3 |
| 8-K/A | 2 |
| SCHEDULE 13D | 1 |
| SCHEDULE 13G | 1 |
| 4/A | 1 |
Latest files
| Filed | Form | Report period | Accession | SEC |
|---|---|---|---|---|
| Aug 20, 2026 | 4 | Aug 19, 2026 | 0001229771-26-000018 | View |
| Aug 13, 2026 | 4 | Aug 12, 2026 | 0001919175-26-000008 | View |
| Aug 12, 2026 | 4 | Aug 11, 2026 | 0001450800-26-000006 | View |
| Aug 12, 2026 | 144 | — | 0001959173-26-005936 | View |
| Aug 11, 2026 | 4 | Aug 07, 2026 | 0001315257-26-000050 | View |
| Aug 11, 2026 | 4 | Aug 10, 2026 | 0001776180-26-000008 | View |
| Aug 11, 2026 | 144 | — | 0001959173-26-005881 | View |
| Aug 10, 2026 | 144 | — | 0001959173-26-005819 | View |
| Aug 07, 2026 | 144 | — | 0001959173-26-005788 | View |
| Aug 06, 2026 | 8-K | Aug 06, 2026 | 0001315257-26-000046 | View |
| Jul 31, 2026 | SCHEDULE 13G/A | — | 0002100119-26-001506 | View |
| Jun 23, 2026 | 4 | Jun 18, 2026 | 0001229771-26-000016 | View |
| Jun 17, 2026 | 4 | Jun 15, 2026 | 0001739998-26-000006 | View |
| Jun 17, 2026 | 4 | Jun 15, 2026 | 0001584601-26-000011 | View |
| Jun 17, 2026 | 4 | Jun 15, 2026 | 0001245155-26-000004 | View |
| Jun 17, 2026 | 4 | Jun 15, 2026 | 0001463649-26-000004 | View |
| Jun 15, 2026 | 4 | Jun 11, 2026 | 0001229771-26-000013 | View |
| Jun 04, 2026 | 4 | Jun 03, 2026 | 0001315257-26-000043 | View |
| May 27, 2026 | 4 | May 26, 2026 | 0002136316-26-000004 | View |
| May 19, 2026 | SCHEDULE 13D | — | 0000921895-26-001441 | View |
| May 14, 2026 | 4 | May 13, 2026 | 0001229771-26-000010 | View |
| May 14, 2026 | 4 | May 12, 2026 | 0001776180-26-000006 | View |
| May 13, 2026 | SCHEDULE 13G/A | — | 0001941040-26-000336 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001584601-26-000008 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001533627-26-000005 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001564614-26-000004 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001190210-26-000004 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001245155-26-000002 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001463649-26-000002 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0002092070-26-000004 | View |
| May 11, 2026 | 4 | May 07, 2026 | 0001739998-26-000004 | View |
| May 11, 2026 | 8-K | May 11, 2026 | 0001315257-26-000041 | View |
| May 08, 2026 | 8-K | May 07, 2026 | 0001315257-26-000036 | View |
| May 07, 2026 | 8-K/A | Nov 05, 2025 | 0001315257-26-000030 | View |
| Apr 30, 2026 | SCHEDULE 13G | — | 0002100119-26-000765 | View |
| 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 |