# Koppers Holdings Inc.: Form SCHEDULE 13D, filed May 19, 2026

- Company: [Koppers Holdings Inc.](/companies/kop.md) (CIK 1315257)
- Form: SCHEDULE 13D
- Filed: 2026-05-19
- Accepted by EDGAR: May 19, 2026, 17:33 ET
- Period: not reported
- Accession: 0000921895-26-001441
- Inline XBRL: no
- Main document: https://www.sec.gov/Archives/edgar/data/1315257/000092189526001441/xslSCHEDULE_13D_X02/primary_doc.xml
- All documents and exhibits: https://www.sec.gov/Archives/edgar/data/1315257/000092189526001441/

## 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/1315257/000092189526001441/xslSCHEDULE_13D_X02/primary_doc.xml

Filed May 19, 2026.
Source: SEC EDGAR, the filing index for accession 0000921895-26-001441. Last ingested by Listed: Nov 6, 2026, 13:28 ET. No prices; not investment advice.