<SEC-DOCUMENT>0001193125-23-079058-index.html : 20230324
<SEC-HEADER>0001193125-23-079058.hdr.sgml : 20230324
<ACCEPTANCE-DATETIME>20230324154001
ACCESSION NUMBER:		0001193125-23-079058
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		11
FILED AS OF DATE:		20230324
DATE AS OF CHANGE:		20230324

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ATI 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:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12001
		FILM NUMBER:		23759721

	BUSINESS ADDRESS:	
		STREET 1:		2021 MCKINNEY AVENUE
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		4123942800

	MAIL ADDRESS:	
		STREET 1:		2021 MCKINNEY AVENUE
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGHENY TECHNOLOGIES INC
		DATE OF NAME CHANGE:	19991213

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLEGHENY TELEDYNE INC
		DATE OF NAME CHANGE:	19960716
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>d431422ddefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: d431422ddefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g431422g005a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g431422g005a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g431422g005b.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g431422g005b.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g431422g005c.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g431422g005c.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g431422g005d.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g431422g005d.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g431422g005e.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g431422g005e.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g431422g005f.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g431422g005f.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g431422g005g.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g431422g005g.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g431422g005h.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g431422g005h.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g431422g005i.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g431422g005i.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g431422sp05.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g431422sp05.jpg

</DOCUMENT>
</SEC-DOCUMENT>