Company facts
- Headquarters
- Pittsburgh, Pennsylvania
- Most recent report
- 10-Q, filed Nov 6, 2026
- Incorporated
- Pennsylvania
- Filings on record
- 1,002+ filings
- On EDGAR
- CIK 1315257
- Fiscal year ends
- December
- Filer status
- Large accelerated filer
Financials 8 of 46
News 8 of 107
Prospectuses and Registrations 8 of 12
- S-8 Registration statement for an employee plan May 8, 2026
- S-8 Registration statement for an employee plan May 9, 2025
- S-8 Registration statement for an employee plan Aug 6, 2021
- S-8 Registration statement for an employee plan May 7, 2021
- S-8 Registration statement for an employee plan May 7, 2021
- S-8 Registration statement for an employee plan May 6, 2020
- 424B3 Prospectus supplement for an offering Feb 27, 2020
- S-3ASR Automatic shelf registration Feb 27, 2020
Proxies 8 of 16
- DEF 14A Proxy statement for a shareholder vote Mar 27, 2026
- DEFA14A Extra proxy material Apr 11, 2025
- DEF 14A Proxy statement for a shareholder vote Mar 28, 2025
- DEF 14A Proxy statement for a shareholder vote Apr 2, 2024
- PRE 14A Preliminary proxy statement Mar 8, 2024
- DEF 14A Proxy statement for a shareholder vote Apr 3, 2023
- DEF 14A Proxy statement for a shareholder vote Apr 4, 2022
- DEFA14A Extra proxy material Apr 19, 2021
Ownership 8 of 814
- SCHEDULE 13G Large holder reported a passive stake Oct 30, 2026
- SCHEDULE 13D/A Large holder reported an active stake, amended Oct 22, 2026
- SCHEDULE 13G/A Large holder reported a passive stake, amended Oct 19, 2026
- SCHEDULE 13G/A Large holder reported a passive stake, amended Oct 8, 2026
- 4 Insider reported a trade Sep 15, 2026
- 4 Insider reported a trade Sep 15, 2026
- 4 Insider reported a trade Sep 15, 2026
- 4 Insider reported a trade Sep 15, 2026
Other 7
- ARS Annual report sent to shareholders Mar 27, 2026
- ARS Annual report sent to shareholders Mar 28, 2025
- ARS Annual report sent to shareholders Apr 2, 2024
- UPLOAD Comment letter from SEC staff Apr 28, 2023
- CORRESP Reply to SEC staff Apr 25, 2023
- UPLOAD Comment letter from SEC staff Apr 11, 2023
- ARS Annual report sent to shareholders Apr 3, 2023
Everything here comes from Koppers Holdings Inc.'s own filings on SEC EDGAR. The filing list is rechecked every hour.