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 |
|---|---|---|---|
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 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 |
| 10-Q | Quarterly report | May 8, 2026 | Mar 31, 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 |
| S-8 | Employee stock plan registration | May 8, 2026 | — |
| 8-K/A |
Amended current report
Officer or director change
|
May 7, 2026 | Nov 5, 2025 |
| ARS | Annual report to shareholders | Mar 27, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Mar 27, 2026 | May 7, 2026 |
| 8-K/A |
Amended current report
Officer or director change
|
Mar 18, 2026 | Jan 5, 2026 |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 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 |
| 10-Q | Quarterly report | Nov 7, 2025 | Sep 30, 2025 |
| 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 |
| 10-Q | Quarterly report | Aug 8, 2025 | Jun 30, 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 |
| 10-Q | Quarterly report | May 9, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 9, 2025 | May 8, 2025 |
| S-8 | Employee stock plan registration | May 9, 2025 | — |
| DEFA14A | Additional proxy material | Apr 11, 2025 | — |
| ARS | Annual report to shareholders | Mar 28, 2025 | Dec 31, 2024 |
| DEF 14A | Proxy statement | Mar 28, 2025 | May 8, 2025 |
| 10-K | Annual report | Feb 27, 2025 | Dec 31, 2024 |
| 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 |
| 10-Q | Quarterly report | Nov 8, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs
|
Nov 8, 2024 | Nov 8, 2024 |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 10-Q | Quarterly report | May 3, 2024 | Mar 31, 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 |
| ARS | Annual report to shareholders | Apr 2, 2024 | Dec 31, 2023 |
| DEF 14A | Proxy statement | Apr 2, 2024 | May 2, 2024 |
| PRE 14A | Preliminary proxy statement | Mar 8, 2024 | May 2, 2024 |
| 10-K | Annual report | Feb 28, 2024 | Dec 31, 2023 |
| 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 |
| 10-Q | Quarterly report | Nov 3, 2023 | Sep 30, 2023 |
| 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 |
| 10-Q | Quarterly report | Aug 3, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2023 | Aug 3, 2023 |
| 10-Q | Quarterly report | May 5, 2023 | Mar 31, 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 |
| UPLOAD | Letter from the SEC | Apr 28, 2023 | — |
| CORRESP | Letter to the SEC | Apr 25, 2023 | — |
| 8-K |
Current report
Material agreement, New debt
|
Apr 11, 2023 | Apr 10, 2023 |
| UPLOAD | Letter from the SEC | Apr 11, 2023 | — |
| ARS | Annual report to shareholders | Apr 3, 2023 | Dec 31, 2022 |
| DEF 14A | Proxy statement | Apr 3, 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 |
| 10-K | Annual report | Feb 27, 2023 | Dec 31, 2022 |
| 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 |
| 10-Q | Quarterly report | Nov 4, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2022 | Nov 4, 2022 |
| 10-Q | Quarterly report | Aug 4, 2022 | Jun 30, 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 |
| 10-Q | Quarterly report | May 6, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
May 6, 2022 | May 5, 2022 |
| DEF 14A | Proxy statement | Apr 4, 2022 | May 5, 2022 |
| 10-K | Annual report | Feb 23, 2022 | Dec 31, 2021 |
| 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 |
| 10-Q | Quarterly report | Nov 4, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2021 | Nov 4, 2021 |
| 10-Q | Quarterly report | Aug 6, 2021 | Jun 30, 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 |
| S-8 | Employee stock plan registration | Aug 6, 2021 | — |
| 10-Q | Quarterly report | May 7, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 7, 2021 | May 6, 2021 |
| S-8 | Employee stock plan registration | May 7, 2021 | — |
| S-8 | Employee stock plan registration | May 7, 2021 | — |
| DEFA14A | Additional proxy material | Apr 19, 2021 | — |
| DEFA14A | Additional proxy material | Apr 19, 2021 | — |
| DEF 14A | Proxy statement | Apr 5, 2021 | May 6, 2021 |
| 10-K | Annual report | Feb 24, 2021 | Dec 31, 2020 |
| 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 |
| 10-Q | Quarterly report | Nov 4, 2020 | Sep 30, 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 |
| 10-Q | Quarterly report | Aug 5, 2020 | Jun 30, 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 |
| 10-Q | Quarterly report | May 7, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 7, 2020 | May 6, 2020 |
| S-8 | Employee stock plan registration | May 6, 2020 | — |
| 8-K |
Current report
Results of operations
|
Apr 27, 2020 | Apr 27, 2020 |
| DEFA14A | Additional proxy material | Apr 24, 2020 | — |
| DEF 14A | Proxy statement | Mar 30, 2020 | May 6, 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 |
| 424B3 | Prospectus | Feb 27, 2020 | — |
| S-3ASR | Automatic shelf registration | Feb 27, 2020 | — |
| 10-K | Annual report | Feb 27, 2020 | Dec 31, 2019 |
| 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 |
| 10-Q | Quarterly report | Nov 7, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2019 | Nov 7, 2019 |
| 10-Q | Quarterly report | Aug 8, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2019 | Aug 8, 2019 |
| 10-Q | Quarterly report | May 3, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations, Shareholder vote results
|
May 3, 2019 | May 3, 2019 |
| DEF 14A | Proxy statement | Apr 1, 2019 | May 2, 2019 |
| 10-K | Annual report | Mar 1, 2019 | Dec 31, 2018 |
| 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 |
| 10-Q | Quarterly report | Nov 8, 2018 | Sep 30, 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 |
| 10-Q | Quarterly report | Aug 9, 2018 | Jun 30, 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 |
| S-8 | Employee stock plan registration | May 3, 2018 | — |
| 10-Q | Quarterly report | May 3, 2018 | Mar 31, 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 |
| DEF 14A | Proxy statement | Mar 29, 2018 | May 1, 2018 |
| 10-K | Annual report | Feb 27, 2018 | Dec 31, 2017 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2018 | Feb 27, 2018 |
| 10-Q | Quarterly report | Nov 9, 2017 | Sep 30, 2017 |
| 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 |
| S-8 | Employee stock plan registration | Aug 3, 2017 | — |
| 10-Q | Quarterly report | Aug 3, 2017 | Jun 30, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2017 | Aug 3, 2017 |
| 10-Q | Quarterly report | May 8, 2017 | Mar 31, 2017 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results
|
May 5, 2017 | May 4, 2017 |
| DEF 14A | Proxy statement | Apr 4, 2017 | May 4, 2017 |
| 10-K | Annual report | Feb 24, 2017 | Dec 31, 2016 |
| 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 |
| S-3ASR | Automatic shelf registration | Dec 15, 2016 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 14, 2016 | Dec 14, 2016 |
| 10-Q | Quarterly report | Nov 3, 2016 | Sep 30, 2016 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2016 | Nov 3, 2016 |
| 10-Q | Quarterly report | Aug 4, 2016 | Jun 30, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2016 | Aug 4, 2016 |
| S-8 | Employee stock plan registration | Jun 10, 2016 | — |
| 10-Q | Quarterly report | May 6, 2016 | Mar 31, 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 |
| DEF 14A | Proxy statement | Apr 5, 2016 | May 5, 2016 |
| 8-K |
Current report
Auditor change
|
Mar 29, 2016 | Mar 23, 2016 |
| 10-K | Annual report | Feb 29, 2016 | Dec 31, 2015 |
| 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 |
| 10-Q | Quarterly report | Nov 5, 2015 | Sep 30, 2015 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2015 | Nov 5, 2015 |
| 10-Q | Quarterly report | Aug 6, 2015 | Jun 30, 2015 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2015 | Aug 6, 2015 |
Showing 186 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)
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.