# Koppers Holdings Inc.: Form DEF 14A, filed Mar 28, 2025

- Company: [Koppers Holdings Inc.](/companies/kop.md) (CIK 1315257)
- Form: DEF 14A
- Filed: 2025-03-28
- Accepted by EDGAR: Mar 28, 2025, 16:30 ET
- Period: 2025-05-08
- Accession: 0000950170-25-046841
- Inline XBRL: yes
- Main document: https://www.sec.gov/Archives/edgar/data/1315257/000095017025046841/kop-20250326.htm
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1315257/000095017025046841/

## Sections

Sections are extracted only from 10-K and 10-Q reports. Read this filing’s documents on sec.gov. https://www.sec.gov/Archives/edgar/data/1315257/000095017025046841/kop-20250326.htm

Filed Mar 28, 2025.
Source: SEC EDGAR, the filing index for accession 0000950170-25-046841. Last ingested by Listed: Oct 30, 2026, 12:04 ET. No prices; not investment advice.