Koppers Holdings Inc. — 8-K Filings
191 8-K filings on record
This page lists all 8-K filings submitted to the SEC by Koppers Holdings Inc. (KOP), sorted by most recent first. Each row links to the full filing on EdgarLookup. Koppers Holdings Inc. has filed 191 8-K documents with the SEC since 2015. To view all SEC filings by Koppers Holdings Inc., see the full filings list.
All
10-K
10-K/A
10-Q
144
144/A
3
3/A
4
4/A
424B1
424B3
5
5/A
8-A12B
8-K
8-K/A
ARS
CERTNYS
CORRESP
DEF 14A
DEFA14A
EFFECT
POS AM
POSASR
PRE 14A
S-1
S-1/A
S-3
S-3/A
S-3ASR
S-4
S-4/A
S-8
SC 13G
SC 13G/A
SCHEDULE 13G
SCHEDULE 13G/A
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 8-K | 8-K | 0001315257-26-000010 | Feb 26, 2026 | — |
| 8-K | 8-K | 0001315257-26-000004 | Jan 9, 2026 | Jan 5, 2026 |
| 8-K | 8-K | 0001315257-25-000010 | Nov 7, 2025 | — |
| 8-K | 8-K | 0001315257-25-000006 | Nov 5, 2025 | — |
| 8-K | 8-K | 0000950170-25-105486 | Aug 8, 2025 | — |
| 8-K | 8-K | 0000950170-25-087681 | Jun 18, 2025 | Jun 17, 2025 |
| 8-K | 8-K | 0000950170-25-078597 | May 29, 2025 | May 22, 2025 |
| 8-K | 8-K | 0000950170-25-067521 | May 9, 2025 | May 8, 2025 |
| 8-K | 8-K | 0000950170-25-028398 | Feb 27, 2025 | — |
| 8-K | 8-K | 0001193125-24-280510 | Dec 17, 2024 | — |
| 8-K | 8-K | 0000950170-24-134339 | Dec 9, 2024 | Dec 5, 2024 |
| 8-K | 8-K | 0000950170-24-133737 | Dec 5, 2024 | — |
| 8-K | 8-K | 0000950170-24-123708 | Nov 8, 2024 | — |
| 8-K | 8-K | 0000950170-24-093360 | Aug 8, 2024 | — |
| 8-K | 8-K | 0000950170-24-052494 | May 3, 2024 | May 2, 2024 |
| 8-K | 8-K | 0001193125-24-095544 | Apr 15, 2024 | Apr 12, 2024 |
| 8-K | 8-K | 0000950170-24-021675 | Feb 28, 2024 | — |
| 8-K | 8-K | 0000950170-24-014607 | Feb 13, 2024 | — |
| 8-K | 8-K | 0000950170-24-000286 | Jan 2, 2024 | Jan 1, 2024 |
| 8-K | 8-K | 0000950170-23-058530 | Nov 3, 2023 | — |
| 8-K | 8-K | 0001193125-23-254683 | Oct 12, 2023 | Oct 11, 2023 |
| 8-K | 8-K | 0000950170-23-048041 | Sep 14, 2023 | — |
| 8-K | 8-K | 0000950170-23-038090 | Aug 3, 2023 | Aug 2, 2023 |
| 8-K | 8-K | 0000950170-23-037613 | Aug 3, 2023 | — |
| 8-K | 8-K | 0000950170-23-018095 | May 5, 2023 | May 4, 2023 |
| 8-K | 8-K | 0001193125-23-097892 | Apr 11, 2023 | Apr 10, 2023 |
| 8-K | 8-K | 0000950170-23-009213 | Mar 22, 2023 | Mar 20, 2023 |
| 8-K | 8-K | 0000950170-23-007354 | Mar 10, 2023 | — |
| 8-K | 8-K | 0000950170-23-004484 | Feb 27, 2023 | — |
| 8-K | 8-K | 0000950170-22-026465 | Dec 13, 2022 | Dec 7, 2022 |
| 8-K | 8-K | 0000950170-22-022075 | Nov 4, 2022 | — |
| 8-K | 8-K | 0001564590-22-027916 | Aug 4, 2022 | — |
| 8-K | FORM 8-K | 0001193125-22-177086 | Jun 21, 2022 | Jun 17, 2022 |
| 8-K | 8-K | 0001564590-22-018460 | May 6, 2022 | May 5, 2022 |
| 8-K | 8-K | 0001564590-22-006038 | Feb 23, 2022 | — |
| 8-K | 8-K | 0001564590-21-059338 | Dec 3, 2021 | Dec 1, 2021 |
| 8-K | 8-K | 0001564590-21-054271 | Nov 4, 2021 | — |
| 8-K | 8-K | 0001564590-21-041928 | Aug 6, 2021 | — |
| 8-K | 8-K | 0001564590-21-041927 | Aug 6, 2021 | — |
| 8-K | 8-K | 0001564590-21-025361 | May 7, 2021 | May 6, 2021 |
| 8-K | 8-K | 0001564590-21-007837 | Feb 24, 2021 | — |
| 8-K | 8-K | 0001564590-21-002766 | Jan 28, 2021 | — |
| 8-K | 8-K | 0001564590-20-057340 | Dec 17, 2020 | — |
| 8-K | 8-K | 0001564590-20-054536 | Nov 19, 2020 | — |
| 8-K | 8-K | 0001564590-20-050200 | Nov 4, 2020 | — |
| 8-K | 8-K | 0001564590-20-047510 | Oct 26, 2020 | — |
| 8-K | 8-K | 0001564590-20-045188 | Sep 30, 2020 | — |
| 8-K | 8-K | 0001564590-20-044157 | Sep 22, 2020 | — |
| 8-K | 8-K | 0001564590-20-041095 | Aug 25, 2020 | — |
| 8-K | 8-K | 0001564590-20-036463 | Aug 5, 2020 | — |