<SEC-DOCUMENT>0001256071-16-000020.txt : 20160211
<SEC-HEADER>0001256071-16-000020.hdr.sgml : 20160211
<ACCEPTANCE-DATETIME>20160211172447
ACCESSION NUMBER:		0001256071-16-000020
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20160211
DATE AS OF CHANGE:		20160211

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:		161412864

	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 INVESTMENT 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 INVESTMENT 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>Allegheny11.txt
<TEXT>
Item 1.

(a)     Allegheny Technologies Incorporated

(b)     1000 Six PPG Place
	Pittsburgh PA 15222-5479
	United States

Item 2.

(a) Platinum Investment Management Limited

(b) Level 8, 7 Macquarie Place
    Sydney NSW 2000
    Australia
(c) Australia
(d) Common Stock
(e) 01741R102

Item 3.
(e) An IA in accordance with Section 240.13d-1(b)(1)(ii)(e)

Item 4.

(a) 5,550,636
(b) 5.1%
(c) (i) 4,811,578
(ii) 0
(iii) 5,550,636
(iv) 0

Item 5
No

Item 6
The clients of Platinum Investment Management Ltd including pooled
investment vehicles and other managed accounts have the right to
receive or power to direct the receipt of dividends from, and the
proceeds from the sale of, Allegheny Technologies Incorporated.

Item 7
N/A

Item 8
N/A

Item 9
N/A


Item 10
(a) By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired and are held
in the ordinary course of business and were not acquired and are not
held for the purpose of or with the effect of changing or influencing
the control of the issuer of the securities and were not acquired and
are not held in connection with or as a participant in any transaction
having that purpose or effect.
(b) N/A


After reasonable inquiry and to the best of my
knowledge and belief, I certify that the information
set forth in this statement is true, complete and correct.

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
