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 |
|---|---|---|---|
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
May 11, 2026 | May 11, 2026 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs, Officer or director change, Shareholder vote results, Regulation FD disclosure
|
May 8, 2026 | May 7, 2026 |
| 8-K/A |
Amended current report
Officer or director change
|
May 7, 2026 | Nov 5, 2025 |
| 8-K/A |
Amended current report
Officer or director change
|
Mar 18, 2026 | Jan 5, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 26, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 9, 2026 | Jan 5, 2026 |
| 8-K/A |
Amended current report
Exit or restructuring costs
|
Dec 3, 2025 | Nov 8, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2025 | Nov 7, 2025 |
| 8-K |
Current report
Officer or director change
|
Nov 5, 2025 | Nov 5, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2025 | Aug 8, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 18, 2025 | Jun 17, 2025 |
| 8-K |
Current report
Officer or director change, Other events
|
May 29, 2025 | May 22, 2025 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 9, 2025 | May 8, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2025 | Feb 27, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Dec 17, 2024 | Dec 17, 2024 |
| 8-K |
Current report
Officer or director change
|
Dec 9, 2024 | Dec 5, 2024 |
| 8-K |
Current report
Exit or restructuring costs
|
Dec 5, 2024 | Dec 5, 2024 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs
|
Nov 8, 2024 | Nov 8, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 8-K |
Current report
Results of operations, Bylaw or fiscal year change, Shareholder vote results
|
May 3, 2024 | May 2, 2024 |
| 8-K/A |
Amended current report
Officer or director change
|
May 2, 2024 | May 2, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 15, 2024 | Apr 12, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2024 | Feb 28, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 13, 2024 | Feb 13, 2024 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 2, 2024 | Jan 1, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2023 | Nov 3, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 12, 2023 | Oct 11, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 14, 2023 | Sep 14, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Aug 3, 2023 | Aug 2, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2023 | Aug 3, 2023 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
May 5, 2023 | May 4, 2023 |
| 8-K/A |
Amended current report
Officer or director change
|
May 4, 2023 | May 4, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 11, 2023 | Apr 10, 2023 |
| 8-K |
Current report
Officer or director change
|
Mar 22, 2023 | Mar 20, 2023 |
| 8-K |
Current report
Other events
|
Mar 10, 2023 | Mar 10, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2023 | Feb 27, 2023 |
| 8-K |
Current report
Officer or director change
|
Dec 13, 2022 | Dec 7, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2022 | Nov 4, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2022 | Aug 4, 2022 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Jun 21, 2022 | Jun 17, 2022 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
May 6, 2022 | May 5, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Feb 23, 2022 | Feb 23, 2022 |
| 8-K |
Current report
Officer or director change
|
Dec 3, 2021 | Dec 1, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2021 | Nov 4, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2021 | Aug 6, 2021 |
| 8-K |
Current report
Officer or director change, Other events
|
Aug 6, 2021 | Aug 6, 2021 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 7, 2021 | May 6, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2021 | Feb 24, 2021 |
| 8-K |
Current report
Results of operations
|
Jan 28, 2021 | Jan 28, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 17, 2020 | Dec 17, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 19, 2020 | Nov 19, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2020 | Nov 4, 2020 |
| 8-K |
Current report
Results of operations
|
Oct 26, 2020 | Oct 26, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 30, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 22, 2020 | Sep 22, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 25, 2020 | Aug 25, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2020 | Aug 5, 2020 |
| 8-K |
Current report
Results of operations
|
Jul 27, 2020 | Jul 27, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 17, 2020 | Jun 17, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
May 20, 2020 | May 20, 2020 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 7, 2020 | May 6, 2020 |
| 8-K |
Current report
Results of operations
|
Apr 27, 2020 | Apr 27, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2020 | Feb 27, 2020 |
| 8-K |
Current report
Material agreement, Other events
|
Feb 27, 2020 | Feb 26, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 18, 2020 | Feb 18, 2020 |
| 8-K |
Current report
Officer or director change, Other events
|
Feb 18, 2020 | Feb 18, 2020 |
| 8-K |
Current report
Officer or director change, Other events
|
Jan 6, 2020 | Jan 1, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2019 | Nov 7, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2019 | Aug 8, 2019 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
May 3, 2019 | May 3, 2019 |
| 8-K |
Current report
Results of operations
|
Mar 1, 2019 | Mar 1, 2019 |
| 8-K |
Current report
Officer or director change
|
Nov 27, 2018 | Nov 27, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2018 | Nov 8, 2018 |
| 8-K |
Current report
Officer or director change, Other events
|
Oct 17, 2018 | Oct 11, 2018 |
| 8-K |
Current report
Officer or director change
|
Sep 11, 2018 | Sep 10, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2018 | Aug 9, 2018 |
| 8-K/A |
Amended current report
Acquisition or sale of assets
|
Jun 25, 2018 | Apr 10, 2018 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 3, 2018 | May 3, 2018 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, New debt, Other events
|
Apr 13, 2018 | Apr 10, 2018 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2018 | Feb 27, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2017 | Nov 9, 2017 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Aug 3, 2017 | May 4, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2017 | Aug 3, 2017 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 5, 2017 | May 4, 2017 |
| 8-K |
Current report
Results of operations
|
Feb 23, 2017 | Feb 23, 2017 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Feb 22, 2017 | Feb 17, 2017 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Jan 25, 2017 | Jan 25, 2017 |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Other events
|
Jan 20, 2017 | Jan 19, 2017 |
| 8-K |
Current report
Material agreement, Other events
|
Jan 20, 2017 | Jan 19, 2017 |
| 8-K |
Current report
Other events
|
Jan 13, 2017 | Jan 13, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 10, 2017 | Jan 10, 2017 |
| 8-K |
Current report
Other events
|
Jan 5, 2017 | Jan 5, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 14, 2016 | Dec 14, 2016 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2016 | Nov 3, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2016 | Aug 4, 2016 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 6, 2016 | May 5, 2016 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 14, 2016 | Apr 8, 2016 |
| 8-K |
Current report
Auditor change
|
Mar 29, 2016 | Mar 23, 2016 |
| 8-K |
Current report
Results of operations
|
Feb 26, 2016 | Feb 25, 2016 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2016 | Feb 25, 2016 |
| 8-K |
Current report
Officer or director change
|
Feb 22, 2016 | Feb 16, 2016 |
| 8-K |
Current report
Exit or restructuring costs, Impairment
|
Jan 13, 2016 | Jan 11, 2016 |
| 8-K |
Current report
Officer or director change
|
Nov 13, 2015 | Nov 9, 2015 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2015 | Nov 5, 2015 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2015 | Aug 6, 2015 |
Showing 106 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.
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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)
Other Lumber & Wood Products (No Furniture) companies
- Trex Co Inc TREX
- Louisiana-Pacific Corp LPX
- CL Workshop Group Ltd NWGL
Source: SEC EDGAR filings. This is company-reported data, not investment advice.