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
DEF 14A Proxy statement Mar 27, 2026 May 7, 2026
DEFA14A Additional proxy material Apr 11, 2025 —
DEF 14A Proxy statement Mar 28, 2025 May 8, 2025
DEF 14A Proxy statement Apr 2, 2024 May 2, 2024
PRE 14A Preliminary proxy statement Mar 8, 2024 May 2, 2024
DEF 14A Proxy statement Apr 3, 2023 —
DEF 14A Proxy statement Apr 4, 2022 May 5, 2022
DEFA14A Additional proxy material Apr 19, 2021 —
DEFA14A Additional proxy material Apr 19, 2021 —
DEF 14A Proxy statement Apr 5, 2021 May 6, 2021
DEFA14A Additional proxy material Apr 24, 2020 —
DEF 14A Proxy statement Mar 30, 2020 May 6, 2020
DEF 14A Proxy statement Apr 1, 2019 May 2, 2019
DEF 14A Proxy statement Mar 29, 2018 May 1, 2018
DEF 14A Proxy statement Apr 4, 2017 May 4, 2017
DEF 14A Proxy statement Apr 5, 2016 May 5, 2016

Showing 16 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.

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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.