Koppers Holdings Inc. reports

Form type	Sec Links	Description	Filing date	Reporting date
10-K	Report \| Data	10-K	Feb 27, 2025	Dec 31, 2024
10-K	Report \| Data	10-K	Feb 28, 2024	Dec 31, 2023
10-K	Report \| Data	10-K	Feb 27, 2023	Dec 31, 2022
10-K	Report \| Data	10-K	Feb 23, 2022	Dec 31, 2021
10-K	Report \| Data	10-K	Feb 24, 2021	Dec 31, 2020
10-K	Report \| Data	10-K	Feb 27, 2020	Dec 31, 2019
10-K	Report \| Data	10-K	Mar 1, 2019	Dec 31, 2018
10-K	Report \| Data	10-K	Feb 27, 2018	Dec 31, 2017
10-K	Report \| Data	KOP-10K-20161231	Feb 24, 2017	Dec 31, 2016
10-K	Report \| Data	10-K	Feb 29, 2016	Dec 31, 2015
10-K	Report \| Data	FORM 10-K	Mar 2, 2015	Dec 31, 2014
10-K	Report \| Data	FORM 10-K	Mar 3, 2014	Dec 31, 2013
10-K	Report \| Data	FORM 10-K	Feb 25, 2013	Dec 31, 2012
10-K/A	Report \| Data	AMENDMENT NO.1 TO FORM 10-K	Mar 27, 2012	Dec 31, 2011
10-K	Report	FORM 10-K	Feb 27, 2012	Dec 31, 2011
10-K	Report \| Data	FORM 10-K	Feb 22, 2011	Dec 31, 2010
10-K	Report	FORM 10-K	Feb 19, 2010	Dec 31, 2009

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