Form 4 Filing Summary

This filing reports a transaction by Marc Jay Walfish, a director at AAR CORP. On May 29, 2026, Mr. Walfish acquired 322 shares of Phantom Stock, with each share equivalent to one share of common stock. The acquisition price was $112.62 per share. Following this transaction, Mr. Walfish holds a total of 54,073 shares of Phantom Stock. The Phantom Stock becomes payable in cash or common stock upon termination of service as a director, or on other specified dates as per the Non-Employee Directors' Deferred Compensation Plan.