<SEC-DOCUMENT>0001033427-18-000040-index.html : 20180820
<SEC-HEADER>0001033427-18-000040.hdr.sgml : 20180820
<ACCEPTANCE-DATETIME>20180820092615
ACCESSION NUMBER:		0001033427-18-000040
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180820
DATE AS OF CHANGE:		20180820

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARMSTRONG WORLD INDUSTRIES INC
		CENTRAL INDEX KEY:			0000007431
		STANDARD INDUSTRIAL CLASSIFICATION:	PLASTICS PRODUCTS, NEC [3089]
		IRS NUMBER:				230366390
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-30703
		FILM NUMBER:		181027287

	BUSINESS ADDRESS:	
		STREET 1:		2500 COLUMBIA AVE
		CITY:			LANCASTER
		STATE:			PA
		ZIP:			17603
		BUSINESS PHONE:		7173970611

	MAIL ADDRESS:	
		STREET 1:		2500 COLUMBIA AVE
		CITY:			LANCASTER
		STATE:			PA
		ZIP:			17603

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ARMSTRONG CORK CO
		DATE OF NAME CHANGE:	19800611

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IRIDIAN ASSET MANAGEMENT LLC/CT
		CENTRAL INDEX KEY:			0001033427
		IRS NUMBER:				061439577
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		276 POST ROAD WEST
		CITY:			WESTPORT
		STATE:			CT
		ZIP:			06880-4704
		BUSINESS PHONE:		2033417800

	MAIL ADDRESS:	
		STREET 1:		276 POST ROAD WEST
		CITY:			WESTPORT
		STATE:			CT
		ZIP:			06880-4704
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>armstrong13ga307312018.htm
<TEXT>
Document 1 - file: armstrong13ga307312018.htm

</DOCUMENT>
</SEC-DOCUMENT>