<SEC-DOCUMENT>0000950170-25-046848-index.html : 20250328
<SEC-HEADER>0000950170-25-046848.hdr.sgml : 20250328
<ACCEPTANCE-DATETIME>20250328163407
ACCESSION NUMBER:		0000950170-25-046848
CONFORMED SUBMISSION TYPE:	ARS
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241231
FILED AS OF DATE:		20250328
DATE AS OF CHANGE:		20250328
EFFECTIVENESS DATE:		20250328

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Koppers Holdings Inc.
		CENTRAL INDEX KEY:			0001315257
		STANDARD INDUSTRIAL CLASSIFICATION:	LUMBER & WOOD PRODUCTS (NO FURNITURE) [2400]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				201878963
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		ARS
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32737
		FILM NUMBER:		25786945

	BUSINESS ADDRESS:	
		STREET 1:		436 SEVENTH AVENUE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219
		BUSINESS PHONE:		412-227-2001

	MAIL ADDRESS:	
		STREET 1:		436 SEVENTH AVENUE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	KI Holdings Inc.
		DATE OF NAME CHANGE:	20050124
</SEC-HEADER>
<DOCUMENT>
<TYPE>ARS
<SEQUENCE>1
<FILENAME>kop_ars_123124.pdf
<DESCRIPTION>ARS
<TEXT>
Document 1 - file: kop_ars_123124.pdf

</DOCUMENT>
</SEC-DOCUMENT>