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Koppers Holdings Inc. — 10-K Filings

21 10-K filings on record

This page lists all 10-K filings submitted to the SEC by Koppers Holdings Inc. (KOP), sorted by most recent first. Each row links to the full filing on EdgarLookup. Koppers Holdings Inc. has filed 21 10-K documents with the SEC since 2015. To view all SEC filings by Koppers Holdings Inc., see the full filings list.

Overview All Filings Financials Insiders
All 10-K 10-K/A 10-Q 144 144/A 3 3/A 4 4/A 424B1 424B3 5 5/A 8-A12B 8-K 8-K/A ARS CERTNYS CORRESP DEF 14A DEFA14A EFFECT POS AM POSASR PRE 14A S-1 S-1/A S-3 S-3/A S-3ASR S-4 S-4/A S-8 SC 13G SC 13G/A SCHEDULE 13G SCHEDULE 13G/A UPLOAD
Form Description Accession Number Filed Period
10-K 10-K 0001315257-26-000012 Feb 26, 2026 Dec 31, 2025
10-K 10-K 0000950170-25-028542 Feb 27, 2025 Dec 31, 2024
10-K 10-K 0000950170-24-021787 Feb 28, 2024 Dec 31, 2023
10-K 10-K 0000950170-23-004546 Feb 27, 2023 Dec 31, 2022
10-K 10-K 0001564590-22-006039 Feb 23, 2022 Dec 31, 2021
10-K 10-K 0001564590-21-007979 Feb 24, 2021 Dec 31, 2020
10-K 10-K 0001564590-20-006973 Feb 27, 2020 Dec 31, 2019
10-K 10-K 0001564590-19-005736 Mar 1, 2019 Dec 31, 2018
10-K 10-K 0001564590-18-003507 Feb 27, 2018 Dec 31, 2017
10-K KOP-10K-20161231 0001564590-17-002413 Feb 24, 2017 Dec 31, 2016
10-K 10-K 0001564590-16-013752 Feb 29, 2016 Dec 31, 2015
10-K FORM 10-K 0001193125-15-073376 Mar 2, 2015 Dec 31, 2014
10-K FORM 10-K 0001193125-14-079638 Mar 3, 2014 Dec 31, 2013
10-K FORM 10-K 0001193125-13-074188 Feb 25, 2013 Dec 31, 2012
10-K FORM 10-K 0001193125-12-082020 Feb 27, 2012 Dec 31, 2011
10-K FORM 10-K 0001193125-11-041968 Feb 22, 2011 Dec 31, 2010
10-K FORM 10-K 0001193125-10-035299 Feb 19, 2010 Dec 31, 2009
10-K FORM 10-K 0001193125-09-034166 Feb 20, 2009 Dec 31, 2008
10-K FORM 10-K 0001193125-08-036303 Feb 22, 2008 Dec 31, 2007
10-K FORM 10-K 0001193125-07-036604 Feb 22, 2007 Dec 31, 2006
10-K FORM 10-K 0001193125-06-060058 Mar 21, 2006 Dec 31, 2005