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Common Stock, $1.00 par value |  | AIR |

NYSE Texas [Member]

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): November 13, 2025

AAR CORP.

(Exact name of registrant as specified in its charter)

Delaware |  | 1-6263 |  | 36-2334820
(State or other jurisdiction of incorporation ) |  | (Commission File Number) |  | (IRS Employer Identification No.)

One AAR Place 1100 N. Wood Dale Road Wood Dale, Illinois | 60191
(Address of principal executive offices) | (Zip Code)

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 7.01. | Regulation FD Disclosure.

On November 13, 2025, AAR CORP. (the “Company”) posted an investor presentation on its website in connection with and in advance of the Company’s participation in the Baird Global Industrial Conference at the Ritz-Carlton Chicago on the same day. A copy of the presentation is furnished as Exhibit 99.1 to this Current Report on Form 8-K.

The information in this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as otherwise stated in such filing.

Item 9.01. | Financial Statements and Exhibits.

(d) Exhibits

Exhibit No. |  | Description
99.1 |  | AAR CORP. Investor Presentation dated November 13, 2025
104 |  | Cover Page Interactive Data File (the cover page XBRL tags are embedded in 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: November 13, 2025

| AAR CORP.
| By: | /s/ Jessica A. Garascia
|  | Jessica A. Garascia
|  | Senior Vice President, General Counsel, Chief Administrative Officer and Secretary