
☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934FOR THE FISCAL YEAR ENDED December 26, 2025OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF1934 FOR THE TRANSITION PERIOD FROMTOCOMMISSION FILE NUMBER 333-48123 Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.Yes☐No☒ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.Yes☐No☒Indicate 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 1934during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation 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☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer, or a smaller reporting company,or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company”, and “emerging growthcompany” in Rule 12b-2 of the Exchange Act. Large Accelerated Filer☐Accelerated Filer☒Non-accelerated Filer☐Smaller reporting company☐Emerging growth company☐ If an emerging growthcompany, indicate by check mark if the registrant has elected not to use the extended transition period for complying with anynew or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.Indicate 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 firmthat preparedorissued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in thefiling reflect the correction of an error to previously issued financial statements.☐Indicate 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).☐Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☒ The aggregate market value of the common stock held by non-affiliates of the registrant was $437,819,579on June 27, 2025 based on the last reportedsale price of the registrant’s common stock on the NASDAQ Global Market.The number of shares of the registrant’s common stock outstanding onFebruary 23, 2026 was 25,380,429. DOCUMENTS INCORPORATED BY REFERENCEPart III of this Annual Report on Form 10-K incorporates by reference certain portions of the registrant’s proxy statement for its 2024 Annual Meeting of Shareholders to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this report. THE HACKETT GROUP, INC.TABLE OF CONTENTS PageFORM 10-KPART IITEM 1.Business4ITEM 1A.Risk Factors8ITEM 1B.Unresolved Staff Comments16ITEM 1C.Cybersecurity16ITEM 2.Properties16ITEM 3.Legal Proceedings16ITEM 4.Mine Safety Disclosures16PART IIITEM 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities17ITEM 6.[Reserved]18ITEM 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations19ITEM 7A.Quantitative and Qualitative Disclosures About Market Risk25ITEM 8.Financial Statements and Supplementary Data26ITEM 9.Changes in and Disagreements with Accountants on Accounting and Financial Disclosure57ITEM 9A.Controls and Procedures57ITEM 9B.Other Information59ITEM 9C.Disclosure Regarding Foreign Jurisdictions that Prevent Inspection.59PART IIIITEM 10.Directors, Executive Officers and Corporate Governance59ITEM 11.Executive Compensation59ITEM 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters59ITEM 13.Certain Relationships and Related Transactions, and Director Independence59ITEM 14.Principal Accounting Fees and Services59PART IVITEM 15.Exhibits and Financial Statement Schedules60ITEM 16.Form 10-K Summary60Index to Exhibits61Signatures63 This Annual Report on Form 10-K and the information incorporated by reference in it include “forward-looking stateme