Koppers SEC Filings
NYSE: KOPBasic MaterialsForest ProductsUSD
43.41-0.83 (-1.88%)
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Koppers filing overview
This page lists 60 recent SEC filings by Koppers (KOP), including 39 4, 5 SCHEDULE 13G/A, 5 8-K, 3 10-Q. The latest annual report (10-K) was filed on Feb 26, 2026 for the period ending Dec 31, 2025. The most recent quarterly report (10-Q) was filed on Aug 6, 2026.
The latest current report (8-K), used to disclose material events such as earnings releases and executive changes, was filed on Aug 6, 2026. Form 10-K is the audited annual report, 10-Q the quarterly report, 8-K covers material events, and Form 4 reports insider transactions. All documents link directly to SEC EDGAR.
Summary generated from market data by MetaCap's automated system. Methodology
KOP SEC filings
| Filed | Form | Description | Document |
|---|---|---|---|
| Oct 8, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Sep 15, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 15, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 15, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 15, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Sep 1, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 20, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 13, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 12, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Aug 6, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Aug 6, 2026 | 10-Q | Quarterly report | View on EDGAR |
| Jul 31, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Jun 23, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 17, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 15, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Jun 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 27, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 19, 2026 | SCHEDULE 13D | Beneficial ownership report (activist) | View on EDGAR |
| May 14, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 14, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 13, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements; Regulation FD Disclosure | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 11, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| May 8, 2026 | 8-K | Results of Operations and Financial Condition; Costs Associated with Exit or Disposal Activities; Departure or Appointment of Directors or Officers; Compensatory Arrangements; Submission of Matters to a Vote of Security Holders; Regulation FD Disclosure | View on EDGAR |
| May 8, 2026 | 10-Q | Quarterly report | View on EDGAR |
| May 7, 2026 | 8-K/A | Amended: Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Apr 30, 2026 | SCHEDULE 13G | Beneficial ownership report (passive) | View on EDGAR |
| Apr 24, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Mar 27, 2026 | SCHEDULE 13G/A | Beneficial ownership report (passive) (amendment) | View on EDGAR |
| Mar 27, 2026 | DEF 14A | Definitive proxy statement | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 25, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 18, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 18, 2026 | 8-K/A | Amended: Departure or Appointment of Directors or Officers; Compensatory Arrangements | View on EDGAR |
| Mar 4, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Mar 3, 2026 | 4/A | Statement of changes in beneficial ownership (amendment) | View on EDGAR |
| Mar 2, 2026 | 4 | Statement of changes in beneficial ownership | View on EDGAR |
| Feb 26, 2026 | 8-K | Results of Operations and Financial Condition | View on EDGAR |
| Feb 26, 2026 | 10-K | Annual report | View on EDGAR |
| Jan 9, 2026 | 8-K | Departure or Appointment of Directors or Officers; Compensatory Arrangements; Other Events | View on EDGAR |
| Dec 3, 2025 | 8-K/A | Amended: Costs Associated with Exit or Disposal Activities | View on EDGAR |
| Nov 7, 2025 | 10-Q | Quarterly report | View on EDGAR |