(Mark One) ☒Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year EndedAugust 30,2025 or Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether 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 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 1934 during thepreceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past90 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 of RegulationS-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, a non-accelerated filer, a smaller reporting company or an emerginggrowth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 ofthe Exchange Act: Large accelerated filer☒Non-accelerated filer☐ If 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 revisedfinancial 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 overfinancial 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 auditreport.☒ 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 the filing reflectthe 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 ofthe 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 number of outstanding shares of the Registrant’s Common Stock and Class B Common Stock as of October 22, 2025were14,565,659and3,551,265,respectively. The aggregate market value of the voting stock of the Registrant held by non-affiliates as of February 28, 2025 (the last business day of theRegistrant’s most recently completed second fiscal quarter), computed by reference to the closing sale price of such shares on such date, was approximately$3,167,000,083. Documents Incorporated By Reference The Registrant intends to file a Definitive Proxy Statement pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended, for its2026 Annual Meeting of Shareholders within 120 days of the end of the fiscal year ended August 30, 2025. Portions of such Proxy Statement are incorporated byreference in Part III of this Annual Report on Form 10-K. UniFirst CorporationAnnual Report on Form 10-KFor the Fiscal Year Ended August 30, 2025 PART I1Item 1.Business1Item 1A.Risk Factors5Item 1B.Unresolved Staff Comments15Item 1C.Cybersecurity15Item 2.Properties16Item 3.Legal Proceedings16Item 4.Mine Safety Disclosures16PART II17Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of EquitySecurities17Item 6.[Reserved]19Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations20Item 7A.Quantitative and Qualitative Disclosures About Market Risk31Item 8.Financial Statements and Supplementary Data32Consolidated Statements of Income for each of the three years in the period ended August 30, 202532Consolidated Statements of Comprehensive Income for each of the three years in the period ended August 30,202533Consolidated Balance Sheets as of August 30, 2025 and August 31, 202434Consolidated Statements of Shareholders’ Equity for each of the three years in the period ended August 30,202535Consolidated Statements of Cash Flows for each of the three years in the period ended August 30, 202536Notes to Consolidated Financial Statements37Report of Ernst & Young LLP, Independent Registered Public Accounting Firm63Item 9.Changes in and Disagreements With Accountants on Accounting and Financial Disclosure65Item 9A.Controls and Procedures65Mana