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STATES SECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\nFORM 10-K\n\n(Mark One)\n\n☒Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934\n\nFor the fiscal year ended December 28, 2025\n\nOR\n\n☐Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934\n\nFor the transition period from                      to                     \n\nCommission file number 1-12001\n\nATI Inc.\n\n(Exact name of registrant as specified in its charter)\n\nDelaware 25-1792394\n\n(State or other jurisdiction of\nincorporation or organization) (I.R.S. Employer\nIdentification Number)\n\n2021 McKinney Avenue\n\nDallas,Texas 75201\n\n(Address of principal executive offices) (Zip Code)\n\nRegistrant’s telephone number, including area code: (800) 289-7454\n\nSecurities registered pursuant to Section 12(b) of the Act: \n\nTitle of each classTrading SymbolName of each exchange on which registered\n\nCommon stock, par value $0.10ATINew York Stock Exchange\n\nSecurities registered pursuant to Section 12(g) of the Act: None\n\nIndicate by check mark whether the Registrant is well known seasoned issuer, as defined in Rule 405 of the Securities Act.     Yes ☒  No  ☐\n\nIndicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ☐    No  ☒\n\nIndicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months, and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒   No  ☐\n\nIndicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐\n\nIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one): \n\nLarge accelerated filer ☒  Accelerated filer ☐\n\nNon-accelerated filer \n☐ (Do not check if a smaller reporting company)\n  Smaller reporting company ☐\n\nEmerging growth company☐\n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐\n\nIndicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒\n\nIf securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statement. ☐\n\nIndicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b).  ☐\n\nIndicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐   No  ☒\n\nOn January 30, 2026, the Registrant had outstanding 136,936,299 shares of its Common Stock.\n\nThe aggregate market value of the Registrant’s voting stock held by non-affiliates at June 29, 2025 was approximately $12.0 billion, based on the closing price per share of Common Stock on June 29, 2025 of $86.80 as reported on the New York Stock Exchange. Shares of Common Stock known by the Registrant to be beneficially owned by directors and officers of the Registrant subject to the reporting and other requirements of Section 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), are not included in the computation. The Registrant, however, has made no determination that such persons are “affiliates” within the meaning of Rule 12b-2 under the Exchange Act.\n\nDocuments Incorporated By Reference\n\nSelected portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on May 14, 2026 are incorporated by reference into Part III of this Report.\n\n1\n\nINDEX\n\n Page\nNumber\n\n[PART I](#i4dad4447d78040c58ec55c20b93ebe58_10)\n\n[Item 1. Business](#i4dad4447d78040c58ec55c20b93ebe58_13)\n\n[3](#i4dad4447d78040c58ec55c20b93ebe58_13)\n\n[Item 1A. Risk Factors](#i4dad4447d78040c58ec55c20b93ebe58_16)\n\n[8](#i4dad4447d78040c58ec55c20b93ebe58_16)\n\n[Item 1B. Unresolved Staff Comments](#i4dad4447d78040c58ec55c20b93ebe58_19)\n\n[16](#i4dad4447d78040c58ec55c20b93ebe58_19)\n\n[Item 1C. Cybersecurity](#i4dad4447d78040c58ec55c20b93ebe58_22)\n\n[16](#i4dad4447d78040c58ec55c20b93ebe58_22)\n\n[Item 2. Properties](#i4dad4447d78040c58ec55c20b93ebe58_25)\n\n[17](#i4dad4447d78040c58ec55c20b93ebe58_25)\n\n[Item 3. Legal Proceedings](#i4dad4447d78040c58ec55c20b93ebe58_28)\n\n[18](#i4dad4447d78040c58ec55c20b93ebe58_28)\n\n[Item 4. Mine Safety Disclosures](#i4dad4447d78040c58ec55c20b93ebe58_31)\n\n[18](#i4dad4447d78040c58ec55c20b93ebe58_31)\n\n[PART II](#i4dad4447d78040c58ec55c20b93ebe58_34)\n\n[Item  5. Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities](#i4dad4447d78040c58ec55c20b93ebe58_37)\n\n[19](#i4dad4447d78040c58ec55c20b93ebe58_37)\n\n[Item 6. [Reserved]](#i4dad4447d78040c58ec55c20b93ebe58_40)\n\n[20](#i4dad4447d78040c58ec55c20b93ebe58_40)\n\n[Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations](#i4dad4447d78040c58ec55c20b93ebe58_70)\n\n[20](#i4dad4447d78040c58ec55c20b93ebe58_43)\n\n[Item 7A. Quantitative and Qualitative Disclosures About Market Risk](#i4dad4447d78040c58ec55c20b93ebe58_73)\n\n[37](#i4dad4447d78040c58ec55c20b93ebe58_73)\n\n[Item 8. Financial Statements and Supplementary Data](#i4dad4447d78040c58ec55c20b93ebe58_76)\n\n[39](#i4dad4447d78040c58ec55c20b93ebe58_76)\n\n[Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure](#i4dad4447d78040c58ec55c20b93ebe58_163)\n\n[87](#i4dad4447d78040c58ec55c20b93ebe58_163)\n\n[Item 9A. Controls and Procedures](#i4dad4447d78040c58ec55c20b93ebe58_166)\n\n[87](#i4dad4447d78040c58ec55c20b93ebe58_166)\n\n[Item 9B. Other Information](#i4dad4447d78040c58ec55c20b93ebe58_169)\n\n[90](#i4dad4447d78040c58ec55c20b93ebe58_169)\n\n[Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections](#i4dad4447d78040c58ec55c20b93ebe58_175)\n\n[90](#i4dad4447d78040c58ec55c20b93ebe58_175)\n\n[PART III](#i4dad4447d78040c58ec55c20b93ebe58_178)\n\n[Item 10. Directors and Executive Officers of the Registrant](#i4dad4447d78040c58ec55c20b93ebe58_181)\n\n[90](#i4dad4447d78040c58ec55c20b93ebe58_181)\n\n[Item 11. Executive Compensation](#i4dad4447d78040c58ec55c20b93ebe58_184)\n\n[90](#i4dad4447d78040c58ec55c20b93ebe58_184)\n\n[Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters](#i4dad4447d78040c58ec55c20b93ebe58_187)\n\n[91](#i4dad4447d78040c58ec55c20b93ebe58_187)\n\n[Item 13. Certain Relationships and Related Transactions, and Director Independence](#i4dad4447d78040c58ec55c20b93ebe58_190)\n\n[91](#i4dad4447d78040c58ec55c20b93ebe58_190)\n\n[Item 14. Principal Accountant Fees and Services](#i4dad4447d78040c58ec55c20b93ebe58_193)\n\n[91](#i4dad4447d78040c58ec55c20b93ebe58_193)\n\n[PART IV](#i4dad4447d78040c58ec55c20b93ebe58_196)\n\n[Item 15. Exhibits, Financial Statements and Financial Statement Schedules](#i4dad4447d78040c58ec55c20b93ebe58_199)\n\n[91](#i4dad4447d78040c58ec55c20b93ebe58_199)\n\n[Item 16. Form 10-K Summary](#i4dad4447d78040c58ec55c20b93ebe58_205)\n\n[94](#i4dad4447d78040c58ec55c20b93ebe58_205)\n\n[SIGNATURES](#i4dad4447d78040c58ec55c20b93ebe58_208)\n\n2\n\nPART I"}