Koppers Holdings Inc.
Koppers Holdings Inc. (KOP) — Form SCHEDULE 13D/A: Ownership over 5% (active) (amendment)
About this filing
Koppers Holdings Inc. (KOP) filed Form SCHEDULE 13D/A (ownership over 5% (active) (amendment)) with the SEC on Oct 22, 2026. A Schedule 13D reports an investor owning more than 5% of the company who may seek to influence it.
Key facts
- Document
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More KOP filings
- 10-Q
Filed Nov 6, 2026
- 8-K
Filed Nov 6, 2026
- SC 13G
Filed Oct 30, 2026
- SC 13G/A
Filed Oct 19, 2026
- SC 13G/A
Filed Oct 8, 2026
- 4
Filed Sep 15, 2026
Not investment advice. Summaries can contain errors; the SEC filing is the official record.