ATI Inc.

ATI·NYSE·$168.76Share Price as of 11/2·$23BMarket Cap as of 11/2

Financials

10-QQ3 ended 09/27/2610/29/26 10-QQ2 ended 06/28/2608/06/26 10-QQ1 ended 03/29/2604/30/26 10-KFY 202502/20/26 10-QQ3 ended 09/28/2510/28/25

Disclosures

8-KCurrent report10/29/26 8-KCurrent report08/06/26 8-KCurrent report06/08/26 8-KCurrent report06/03/26 8-KCurrent report06/03/26

Prospectuses and Registrations

424B5Prospectus supplement06/04/26 424B3Prospectus06/03/26 FWPFree writing prospectus06/03/26 S-3ASRAutomatic shelf registration02/23/24 424B5Prospectus supplement08/08/23

Proxies

DEF 14ADefinitive proxy03/24/26 DEFA14AAdditional proxy materials03/24/26 DEF 14ADefinitive proxy03/27/25 DEFA14AAdditional proxy materials03/27/25 DEF 14ADefinitive proxy03/28/24

Ownership

Form 4Insider transaction09/23/26 144Proposed sale of securities09/21/26 Form 4Insider transaction09/16/26 144Proposed sale of securities09/14/26 Form 4Insider transaction09/10/26

Other

11-KEmployee stock purchase plan report06/17/26 11-KEmployee stock purchase plan report06/17/26 ARSAnnual report to shareholders03/24/26 UPLOADLetter from the SEC06/24/25 CORRESPCorrespondence with the SEC06/20/25