SC 13DThe Stakes
Koppers Holdings Inc. files SC 13D
Filed May 19, 2026 · 1mo ago · Accession 0000921895-26-001441
Plain English
Activist stake — an investor has acquired more than 5% with intent to influence.
Read the source below for the full document.
Filing details
- Company
- Koppers Holdings Inc.
- Ticker
- KOP
- CIK
- 1315257
- Form type
- SC 13D
- Filing date
- May 19, 2026
- Report date
- —
- Document
- —
- Size
- —