Koppers Holdings, Inc. (KOP)
NYSE: KOP · Lumber & Wood Products (No Furniture) · Pittsburgh, PA · filing with the SEC since 2005
Grade5.6
◀ Past 6.6● Present 5.8▶ Future 4.3
Filings
227 filings since 2017 beside 677 insider forms · Large accelerated filer · read from EDGAR on Nov 13, 2026Due nextLarge accelerated filer
10-K
Annual report for the fiscal year ending Dec 31, 2026Large accelerated filers have 60 days after the fiscal year ends.
by Mar 1, 2027
10-Q
Quarterly report for the quarter ending Mar 31, 2027Large accelerated filers have 40 days after the quarter ends; quarter ends are taken to the month end.
by May 10, 2027
A deadline is the latest date the SEC's rules allow for its filer category. It is not a forecast of the day the company files. Last time, the results release (8-K item 2.02) came 37 days after the quarter ended. The proxy statement was last filed Mar 27, 2026.
Filings a yearinsider forms included
559772881341338185
2026 counts to Nov 13, 2026.
Officer or director change (8-K item 5.02): 12 times in the last 36 months, the newest May 11, 2026.
Insider forms (3, 4, 5 and 144) are counted each year but not listed here; the people and their trades are on the Ownership tab.
FiledFormWhat it is, in plain wordsPeriodAsk
May 11, 2026
8-K items 5.02, 7.01, 9.01
Officer or director change; Investor disclosure (Regulation FD) · Current report
May 8, 2026
8-K items 2.02, 2.05, 5.02, 5.07, 7.01, 9.01
Results released; Exit or restructuring costs; Officer or director change; Shareholder vote; Investor disclosure (Regulation FD) · Current report
May 7, 2026
Mar 18, 2026
8-K/A items 5.02, 9.01
Officer or director change · Current report, amended
Jan 5, 2026
Jan 9, 2026
8-K items 5.02, 8.01, 9.01
Officer or director change; Other event · Current report
Jan 5, 2026
Jun 18, 2025
8-K items 1.01, 2.03, 9.01
Major agreement signed; New debt or obligation taken on · Current report
Jun 17, 2025
May 29, 2025
8-K items 5.02, 8.01, 9.01
Officer or director change; Other event · Current report
May 22, 2025
May 9, 2025
8-K items 2.02, 5.02, 5.07, 9.01
Results released; Officer or director change; Shareholder vote · Current report
May 8, 2025
40 of 227 shown
Every row opens the filing on EDGAR. The plain words are the site's own for each form and each 8-K item; the complete history, insider forms included, is on EDGAR.