Form 4 Filing for AAON, INC.

This filing reports a stock award granted to Chung Kin Cheung, Chief Financial Officer of AAON, INC., on April 20, 2026. The award, valued at $0.00 per share, consists of 15,507 shares of Common Stock, par value $0.004. These shares vest ratably over the first three anniversaries of the grant date. Post-transaction, the reporting owner holds 17,541 shares. Additionally, the filing discloses a stock option to purchase 5,211 shares of Common Stock with an exercise price of $97.90, exercisable from April 20, 2027, and expiring on April 20, 2036. The filing was submitted late due to administrative delays.