<SEC-DOCUMENT>0001256071-17-000008-index.html : 20170215
<SEC-HEADER>0001256071-17-000008.hdr.sgml : 20170215
<ACCEPTANCE-DATETIME>20170214182110
ACCESSION NUMBER:		0001256071-17-000008
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20170215
DATE AS OF CHANGE:		20170214

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLEGHENY TECHNOLOGIES INC
		CENTRAL INDEX KEY:			0001018963
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL PIPE & TUBES [3317]
		IRS NUMBER:				251792394
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-46715
		FILM NUMBER:		17611919

	BUSINESS ADDRESS:	
		STREET 1:		1000 SIX PPG PLACE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15222
		BUSINESS PHONE:		4123942800

	MAIL ADDRESS:	
		STREET 1:		100 SIX PPG PLACE
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15222

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGHENY TELEDYNE INC
		DATE OF NAME CHANGE:	19960716

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PLATINUM INVESTMENT MANAGEMENT LTD
		CENTRAL INDEX KEY:			0001256071
		IRS NUMBER:				000000000

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		C/O PLATINUM ASSET MANAGEMENT
		STREET 2:		LEVEL 8, 7 MACQUARIE PLACE
		CITY:			SYDNEY AUSTRALIA 2000
		STATE:			C3
		ZIP:			00000
		BUSINESS PHONE:		61292557533

	MAIL ADDRESS:	
		STREET 1:		C/O PLATINUM ASSET MANAGEMENT
		STREET 2:		LEVEL 8, 7 MACQUARIE PLACE
		CITY:			SYDNEY AUSTRALIA 2000
		STATE:			C3
		ZIP:			00000

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PLATINUM ASSET MANAGEMENT LTD
		DATE OF NAME CHANGE:	20030722
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>Allegheny21.txt
<TEXT>
Document 1 - file: Allegheny21.txt

</DOCUMENT>
</SEC-DOCUMENT>