Shareholder Vote

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549   FORM  8-K   CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934   Date of Report (Date of Earliest Event Reported): September 16, 2025   AAR CORP. (Exact name of registrant as specified in its charter)   Delaware   1-6263   36-2334820 (State of Incorporation )   (Commission File Number)   (IRS Employer Identification No.)   One AAR Place 1100 N. Wood Dale Road Wood Dale , Illinois 60191 (Address and Zip Code of Principal Executive Offices)   Registrant’s telephone number, including area code: ( 630 ) 227-2000   Not Applicable (Former name or former address, if changed since last report)   Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:   ¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))   Securities registered pursuant to Section 12(b) of the Act:   Title of Each Class   Trading Symbol(s)   Name of Each Exchange on Which Registered Common Stock, $1.00 par value   AIR   New York Stock Exchange     NYSE Texas   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b—2 of this chapter).   Emerging growth company  ¨   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 revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨             Item 5.07. Submission of Matters to a Vote of Security Holders.   On September 16, 2025, AAR CORP. (the “Company”) held its 2025 annual meeting of stockholders (the “Annual Meeting”). At the Annual Meeting, 33,426,008 shares of common stock, par value $1.00 per share, or approximately 93 % of the 35,964,153 shares of common stock outstanding and entitled to vote at the Annual Meeting, were present in person or by proxy. Set forth below are the matters acted upon by the Company’s stockholders at the Annual Meeting, as such matters are more fully described in the Company’s proxy statement filed on August 5, 2025, and the final voting results on each such matter.   Proposal 1:            Election of Directors.   The stockholders elected each of the Company’s three Class II director nominees for a three-year term expiring at the 2028 annual meeting, as reflected in the following voting results:   Name of Nominee   For     Against     Abstain     Broker Non-Votes   Jeffrey N. Edwards   26,071,385     5,679,722     3,843     1,671,058   John M. Holmes   30,566,655     1,184,313     3,982     1,671,058   Ellen M. Lord   29,716,379     2,008,633     29,938     1,671,058   Marc J. Walfish   28,849,972     2,900,894     4,084     1,671,058     The continuing directors of the Company are Michael R. Boyce, John W. Dietrich, Robert F. Leduc, Duncan J. McNabb, Billy J. Nolen, Peter Pace, Jennifer L. Vogel, and Hema Widhani.   Proposal 2: Advisory Proposal to Approve our Fiscal 2025 Executive Compensation.   The stockholders approved the advisory proposal for our Fiscal 2025 executive compensation, as reflected in the following voting results:   For     Against     Abstain     Broker Non-Votes   29,810,339     1,925,382     19,229     1,671,058     Proposal 3:         Ratification of Appointment of Independent Registered Public Accounting Firm.   The stockholders ratified the appointment of KPMG LLP as the Company’s independent registered public accounting firm for the fiscal year ending May 31, 2026, as reflected in the following voting results:   For     Against     Abstain   32,519,666     900,923     5,419     Item 9.01. Financial Statements and Exhibits.   (d)                     Exhibits   Exhibit No.   Description       104   Cover Page Interactive Data File (embedded in the Inline XBRL document)     2     SIGNATURE   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 hereunto duly authorized.   Date:          September 16 , 2025     AAR CORP.       By: /s/ Jessica A. Garascia     Jessica A. Garascia     Senior Vice President, General Counsel, Chief Administrative Officer and Secretary     3