Form 4 Filing for ACI WORLDWIDE, INC.

Didier R. Lamouche, a director at ACI WORLDWIDE, INC. (ACIW), acquired 5,720 shares of common stock on June 2, 2026. The shares were awarded as restricted stock units under the company's 2020 Equity and Performance Incentive Plan. These shares vest on the earlier of an anniversary of the grant date, the day before the next annual stockholders meeting, or a change in control of the company. The acquisition was made at a price of $0.0 per share, and following this transaction, Mr. Lamouche now owns 8,950 shares. The filing was signed by Dennis Byrnes as attorney-in-fact for Mr. Lamouche on June 3, 2026.