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Common Stock, $1.00 par value |  | AIR |

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): April 30, 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
|  | Chicago Stock Exchange

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 7.01 | Regulation FD Disclosure.

AAR CORP. management will be presenting at multiple investor meetings during the fourth quarter of fiscal 2025. Attached as Exhibit 99.1 are the slides to be used in the investor meetings.

The information in this Item 7.01 and Exhibit 99.1 attached hereto shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, nor shall it be deemed incorporated by reference in any filing under the Securities Act, except as shall be expressly set forth by specific reference in such filing.

| Item 9.01 | Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No. |  | Description
99.1 |  | Slide Presentation by AAR CORP. dated April 30, 2025
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL document)

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: April 30, 2025 |
| AAR CORP.
| By: |
|  | /s/ SEAN M. GILLEN
|  | Sean M. Gillen
|  | Senior Vice President and Chief Financial Officer
|  | (Principal Financial Officer)