Koppers Holdings Inc. SEC filings KOP

Koppers Holdings Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Jun 2, 2015. Its latest annual report, Form ARS, was filed on Mar 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 6, 2026 (results of operations). The company's fiscal year ends on December 31.

Form Description Filed Period
ARS Annual report to shareholders Mar 27, 2026 Dec 31, 2025
10-K Annual report Feb 26, 2026 Dec 31, 2025
ARS Annual report to shareholders Mar 28, 2025 Dec 31, 2024
10-K Annual report Feb 27, 2025 Dec 31, 2024
ARS Annual report to shareholders Apr 2, 2024 Dec 31, 2023
10-K Annual report Feb 28, 2024 Dec 31, 2023
ARS Annual report to shareholders Apr 3, 2023 Dec 31, 2022
10-K Annual report Feb 27, 2023 Dec 31, 2022
10-K Annual report Feb 23, 2022 Dec 31, 2021
10-K Annual report Feb 24, 2021 Dec 31, 2020
10-K Annual report Feb 27, 2020 Dec 31, 2019
10-K Annual report Mar 1, 2019 Dec 31, 2018
10-K Annual report Feb 27, 2018 Dec 31, 2017
10-K Annual report Feb 24, 2017 Dec 31, 2016
10-K Annual report Feb 29, 2016 Dec 31, 2015

Showing 15 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.

New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.

Company profile

Industry
Lumber & Wood Products (No Furniture) (SIC 2400)
Listed as
KOP (NYSE)
Fiscal year ends
December 31
Incorporated in
PA
Headquarters
Pittsburgh, PA
SEC filer status
Large accelerated filer
SEC CIK
1315257
Former names
KI Holdings Inc. (until Nov 14, 2005)

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Source: SEC EDGAR filings. This is company-reported data, not investment advice.