Koppers Holdings Inc. SEC filings KOP
Koppers Holdings Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Jun 2, 2015. Its latest annual report, Form ARS, was filed on Mar 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 6, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| S-8 | Employee stock plan registration | May 8, 2026 | — |
| S-8 | Employee stock plan registration | May 9, 2025 | — |
| S-8 | Employee stock plan registration | Aug 6, 2021 | — |
| S-8 | Employee stock plan registration | May 7, 2021 | — |
| S-8 | Employee stock plan registration | May 7, 2021 | — |
| S-8 | Employee stock plan registration | May 6, 2020 | — |
| 424B3 | Prospectus | Feb 27, 2020 | — |
| S-3ASR | Automatic shelf registration | Feb 27, 2020 | — |
| S-8 | Employee stock plan registration | May 3, 2018 | — |
| S-8 | Employee stock plan registration | Aug 3, 2017 | — |
| S-3ASR | Automatic shelf registration | Dec 15, 2016 | — |
| S-8 | Employee stock plan registration | Jun 10, 2016 | — |
Showing 12 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Lumber & Wood Products (No Furniture) (SIC 2400)
- Listed as
- KOP (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- PA
- Headquarters
- Pittsburgh, PA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1315257
- Former names
- KI Holdings Inc. (until Nov 14, 2005)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.