0001959173-26-006643.txt : 20260902 0001959173-26-006643.hdr.sgml : 20260902 20260902144259 ACCESSION NUMBER: 0001959173-26-006643 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20260902 DATE AS OF CHANGE: 20260902 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: ATI INC CENTRAL INDEX KEY: 0001018963 STANDARD INDUSTRIAL CLASSIFICATION: STEEL PIPE & TUBES [3317] ORGANIZATION NAME: 04 Manufacturing EIN: 251792394 STATE OF INCORPORATION: DE FISCAL YEAR END: 1228 FILING VALUES: FORM TYPE: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 001-12001 FILM NUMBER: 261354148 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 REPORTING-OWNER: COMPANY DATA: COMPANY CONFORMED NAME: Morehouse David J CENTRAL INDEX KEY: 0001635153 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 144 MAIL ADDRESS: STREET 1: C/O ATI INC. STREET 2: 2021 MCKINNEY AVENUE CITY: DALLAS STATE: TX ZIP: 75201 144 1 primary_doc.xml 144 0001635153 XXXXXXXX LIVE 0001018963 ATI INC 001-12001 2021 MCKINNEY AVENUE DALLAS TX 75201 4123942800 Morehouse David J Director Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

2485 501002.70 136170383 09/02/2026 NYSE Common 05/20/2026 Restricted Stock Vesting Issuer N 2485 05/20/2026 Compensation Y 09/02/2026 /s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David Morehouse