    <SEC-DOCUMENT>0001193125-24-080441-index.html : 20240328
    <SEC-HEADER>0001193125-24-080441.hdr.sgml : 20240328
    <ACCEPTANCE-DATETIME>20240328150852
    ACCESSION NUMBER:		0001193125-24-080441
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240328
    DATE AS OF CHANGE:		20240328
    EFFECTIVENESS DATE:		20240328

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ATI INC
    		CENTRAL INDEX KEY:			0001018963
    		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL PIPE & TUBES [3317]
    		ORGANIZATION NAME:           	04 Manufacturing
    		IRS NUMBER:				251792394
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-12001
    		FILM NUMBER:		24798133

    	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>ARS
    <SEQUENCE>1
    <FILENAME>d927640dars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: d927640dars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>