KOP News
Official issuer or fund updates, exact SEC current reports, and large established publisher coverage, newest first. Every lawfully retained item remains in the corpus; each public page contains at most 100 rows. Headlines open the exact source; summaries are concise descriptions and not investment recommendations. Captured 2026-08-31.
| Date | Type | Publisher | Headline | Summary |
|---|---|---|---|---|
| 2026-08-06 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2026-05-11 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,7.01,9.01. |
| 2026-05-08 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,2.05,5.02,5.07,7.01,9.01. |
| 2026-05-07 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 5.02,9.01. |
| 2026-03-18 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 5.02,9.01. |
| 2026-02-26 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2026-01-09 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2025-12-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 2.05. |
| 2025-11-07 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2025-11-05 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,9.01. |
| 2025-08-08 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2025-06-18 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,9.01. |
| 2025-05-29 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2025-05-09 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.02,5.07,9.01. |
| 2025-02-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2024-12-17 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,9.01. |
| 2024-12-09 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02. |
| 2024-12-05 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.05,9.01. |
| 2024-11-08 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,2.05,9.01. |
| 2024-08-08 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2024-05-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.03,5.07,9.01. |
| 2024-05-02 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 5.02,9.01. |
| 2024-04-15 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,9.01. |
| 2024-02-28 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2024-02-13 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,9.01. |
| 2024-01-02 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2023-11-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2023-10-12 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,9.01. |
| 2023-09-14 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2023-08-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2023-08-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.03,9.01. |
| 2023-05-05 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.07,9.01. |
| 2023-05-04 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 5.02,9.01. |
| 2023-04-11 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,9.01. |
| 2023-03-22 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,9.01. |
| 2023-03-10 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 8.01,9.01. |
| 2023-02-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2022-12-13 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,9.01. |
| 2022-11-04 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2022-08-04 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2022-06-21 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,1.02,2.03,9.01. |
| 2022-05-06 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.07,9.01. |
| 2022-02-23 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,8.01,9.01. |
| 2021-12-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02. |
| 2021-11-04 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2021-08-06 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2021-08-06 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2021-05-07 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.02,5.07,9.01. |
| 2021-02-24 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2021-01-28 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-12-17 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-11-19 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-11-04 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-10-26 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-09-30 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-09-22 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-08-25 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-08-05 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-07-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-06-17 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-05-20 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2020-05-07 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.02,5.07,9.01. |
| 2020-04-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-02-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,8.01,9.01. |
| 2020-02-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-02-18 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2020-02-18 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2020-01-06 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2019-11-07 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2019-08-08 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2019-05-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.07,9.01. |
| 2019-03-01 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2018-11-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,9.01. |
| 2018-11-08 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2018-10-17 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,8.01,9.01. |
| 2018-09-11 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 5.02,9.01. |
| 2018-08-09 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2018-06-25 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 2.01,9.01. |
| 2018-05-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.02,5.07,9.01. |
| 2018-04-13 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.01,2.03,8.01,9.01. |
| 2018-02-27 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2017-11-09 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2017-08-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2017-08-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K/A | Koppers Holdings Inc. filed Form 8-K/A covering items 5.07. |
| 2017-05-05 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.02,5.07,9.01. |
| 2017-02-23 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2017-02-22 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,1.02,2.03,9.01. |
| 2017-01-25 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,8.01,9.01. |
| 2017-01-20 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,8.01,9.01. |
| 2017-01-20 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,3.03,8.01,9.01. |
| 2017-01-13 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 8.01,9.01. |
| 2017-01-10 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2017-01-05 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 8.01,9.01. |
| 2016-12-14 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 7.01,9.01. |
| 2016-11-03 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2016-08-04 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |
| 2016-05-06 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,5.02,5.07,9.01. |
| 2016-04-14 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 1.01,2.03,9.01. |
| 2016-03-29 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 4.01,9.01. |
| 2016-02-26 | Current report | SEC filing | Koppers Holdings Inc. filed Form 8-K | Koppers Holdings Inc. filed Form 8-K covering items 2.02,9.01. |