Koppers Holdings Inc. (KOP) Form 10-Q Quarterly Reports
Koppers Holdings Inc. (KOP) is a publicly traded company on the NYSE, categorized under SIC 2400 (Lumber & Wood Products (No Furniture)). Access real-time SEC filings, 10-K annual reports, 10-Q quarterlies, 8-K current reports, PCAOB auditor history, and executive compensation disclosures.
Ticker: KOP
CIK: 1315257
Exchange: NYSE
SIC 2400: Lumber & Wood Products (No Furniture)
Fiscal Year End: 12/31
State: PA
Independent PCAOB Auditor
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Audit Firm
KPMG LLP
Auditor SinceSince 12/31/2016 12:00:00 AM
Lead Engagement PartnerWilliam Blose
Audit LocationPittsburgh, Pennsylvania, United States
Latest SEC EDGAR Filings
Showing 10-K, 10-Q, 8-K, Form 4, and other SEC submissions| Form | Filing Date | Reporting Period | Description | Accession Number | Actions |
|---|---|---|---|---|---|
| SCHEDULE 13G/A | 2026-10-08 | — | SCHEDULE 13G/A Filing | 0000354204-26-001043 | View SEC Doc Filr Page |
| 4 | 2026-09-15 | 2026-09-14 | FORM 4 | 0001245155-26-000006 | View SEC Doc Filr Page |
| 4 | 2026-09-15 | 2026-09-14 | FORM 4 | 0001463649-26-000006 | View SEC Doc Filr Page |
| 4 | 2026-09-15 | 2026-09-14 | FORM 4 | 0001584601-26-000013 | View SEC Doc Filr Page |
| 4 | 2026-09-15 | 2026-09-14 | FORM 4 | 0001315257-26-000052 | View SEC Doc Filr Page |
| 4 | 2026-09-01 | 2026-08-31 | FORM 4 | 0001229771-26-000020 | View SEC Doc Filr Page |
| 4 | 2026-08-20 | 2026-08-19 | FORM 4 | 0001229771-26-000018 | View SEC Doc Filr Page |
| 4 | 2026-08-13 | 2026-08-12 | FORM 4 | 0001919175-26-000008 | View SEC Doc Filr Page |
| 4 | 2026-08-12 | 2026-08-11 | FORM 4 | 0001450800-26-000006 | View SEC Doc Filr Page |
| 144 | 2026-08-12 | — | 144 Filing | 0001959173-26-005936 | View SEC Doc Filr Page |
| 4 | 2026-08-11 | 2026-08-10 | FORM 4 | 0001776180-26-000008 | View SEC Doc Filr Page |
| 4 | 2026-08-11 | 2026-08-07 | FORM 4 | 0001315257-26-000050 | View SEC Doc Filr Page |
| 144 | 2026-08-11 | — | 144 Filing | 0001959173-26-005881 | View SEC Doc Filr Page |
| 144 | 2026-08-10 | — | 144 Filing | 0001959173-26-005819 | View SEC Doc Filr Page |
| 144 | 2026-08-07 | — | 144 Filing | 0001959173-26-005788 | View SEC Doc Filr Page |
| 10-Q | 2026-08-06 | 2026-06-30 | 10-Q | 0001315257-26-000048 | View SEC Doc Filr Page |
| 8-K | 2026-08-06 | 2026-08-06 | 8-K | 0001315257-26-000046 | View SEC Doc Filr Page |
| SCHEDULE 13G/A | 2026-07-31 | — | SCHEDULE 13G/A Filing | 0002100119-26-001506 | View SEC Doc Filr Page |
| 4 | 2026-06-23 | 2026-06-18 | FORM 4 | 0001229771-26-000016 | View SEC Doc Filr Page |
| 4 | 2026-06-17 | 2026-06-15 | FORM 4 | 0001463649-26-000004 | View SEC Doc Filr Page |
| 4 | 2026-06-17 | 2026-06-15 | FORM 4 | 0001245155-26-000004 | View SEC Doc Filr Page |
| 4 | 2026-06-17 | 2026-06-15 | FORM 4 | 0001584601-26-000011 | View SEC Doc Filr Page |
| 4 | 2026-06-17 | 2026-06-15 | FORM 4 | 0001739998-26-000006 | View SEC Doc Filr Page |
| 4 | 2026-06-15 | 2026-06-11 | FORM 4 | 0001229771-26-000013 | View SEC Doc Filr Page |
| 4 | 2026-06-04 | 2026-06-03 | FORM 4 | 0001315257-26-000043 | View SEC Doc Filr Page |