Skip to main content
Koppers Holdings Inc. logo

Koppers Holdings Inc. — Investor Relations & Filings

Ticker · KOP ISIN · US50060P1066 US Manufacturing
Open in API
Filings indexed 1,539 across all filing types
Latest filing 2026-05-11 Board/Management Inform…
Country US United States of America
Listing US KOP

About Koppers Holdings Inc.

https://www.koppers.com/

Koppers Holdings Inc. is an integrated global provider of treated wood products, wood preservation chemicals, and carbon compounds. The company specializes in wood preservation technology, manufacturing pressure-treated products such as railroad crossties and utility poles for the railroad, utility, construction, and infrastructure industries. It also distills coal tar to produce carbon materials and chemicals, including carbon pitch and creosote. Koppers provides complementary services such as utility infrastructure maintenance, inspection, and environmentally responsible end-of-life management for treated wood. The company focuses on developing sustainable solutions supported by research and innovation.

Recent filings

Filing Released Lang Actions
8-K - Koppers Holdings Inc. (0001315257) (Filer)
Board/Management Information Classification · 90% confidence The document is a SEC Form 8-K “Current Report” reporting under Item 5.02 the election of a new Chief Financial Officer and related management changes. It does not contain financial statements or earnings, but rather announces appointments and departures of senior officers. This falls squarely under the Board/Management Information category.
2026-05-11 English
10-Q - Koppers Holdings Inc. (0001315257) (Filer)
Interim / Quarterly Report Q1 2026
2026-05-08 English
8-K - Koppers Holdings Inc. (0001315257) (Filer)
Regulatory Filings Classification · 90% confidence The document is a Form 8-K “Current Report” filed with the SEC by Koppers Holdings Inc., covering multiple items (earnings press release, cost‐disposal notice, director changes, shareholder vote results, Regulation FD disclosure, exhibits), and is not itself an annual or interim financial report, proxy statement, or other narrowly defined filing. It is a general regulatory announcement, fitting the “Regulatory Filings” fallback category.
2026-05-08 English
S-8 - Koppers Holdings Inc. (0001315257) (Filer)
Share Issue/Capital Change Classification · 95% confidence The document is a SEC Form S-8 registration statement filed under the Securities Act of 1933 to register an additional 300,000 shares of common stock under an employee stock purchase plan. This is not an earnings release or management discussion; it is a registration of new share issuance. Under the provided taxonomy, announcements and filings regarding new shares or capital structure changes are classified as Share Issue/Capital Change (SHA).
2026-05-08 English
8-K/A - Koppers Holdings Inc. (0001315257) (Filer)
Regulatory Filings
2026-05-07 English
SCHEDULE 13G/A - Koppers Holdings Inc. (0001315257) (Subject)
Major Shareholding Notification
2026-03-27 English

Browse filings by year

17 years

Report missing filing

Can't find a specific document? Let us know and we'll add it within 24 hours.

We will notify you once the filing is added.
Report sent
Thank you. We will check the data and update it shortly.