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ATI INC

For the period ended Jun 28, 2026. Filed Aug 6, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Jun 28, 2026 · Filed Aug 6, 2026

ATI$184.85+5.2%Stored close · as of Nov 9, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Item 6. Exhibits

(a) Exhibits

10.1Third Supplemental Indenture, dated June 8, 2026, between ATI Inc. and Computershare Trust Company, N.A., as trustee (incorporated by reference to Exhibit 1.1 to the Company's Current Report on Form 8-K filed June 8, 2026).
10.2Form of 5.875% Senior Note due 2033 (included in and incorporated by reference to Exhibit 1.1 to the Company's Current Report on Form 8-K filed on June 8, 2026).
31.1Certification of Chief Executive Officer required by Securities and Exchange Commission Rule 13a – 14(a) or 15d – 14(a) (filed herewith).
31.2Certification of Chief Financial Officer required by Securities and Exchange Commission Rule 13a – 14(a) or 15d – 14(a) (filed herewith).
32.1Certification pursuant to 18 U.S.C. Section 1350 (furnished herewith).
101.INSInline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCHInline XBRL Taxonomy Extension Schema Document.
101.CALInline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEFInline XBRL Taxonomy Extension Definition Linkbase Document.
101.LABInline XBRL Taxonomy Extension Label Linkbase Document.
101.PREInline XBRL Taxonomy Extension Presentation Linkbase Document.
104Cover Page Interactive Data File - the cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ATI INC.

(Registrant)

Date:August 6, 2026By/s/ James Robert Foster
James Robert Foster
Senior Vice President, Finance and Chief Financial Officer(Principal Financial Officer)
Date:August 6, 2026By/s/ Michael B. Miller
Michael B. Miller
Vice President, Controller and Chief Accounting Officer(Principal Accounting Officer)
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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.