ACI WORLDWIDE, INC.

Rule 10b5-1 Plans

None of the Company’s directors or officers adopted, modified, orterminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the three months ended December 31, 2025.

Non-Employee Director Restricted Share Unit Award Agreement Amendment

On February 23, 2026, the Board approved an amendment (the “Amendment”) to the Company’s non-employee director Restricted Share Unit Award Agreements granted in 2025 (the “2025 RSU Agreements’) under the Company’s 2020 Plan.

Pursuant to the Amendment, in the event a non-employee director’s service on the Board terminates for any reason (other than death or disability) prior to the scheduled vesting date of an outstanding equity award, such award will vest on a ratable basis based on the portion of the applicable vesting period completed as of the date of termination, rather than being forfeited in its entirety. Any unvested portion of the award that has not vested on a ratable basis as of the termination date will be forfeited in accordance with the terms of the 2020 Plan, as amended from time-to-time.

The Amendment applies to equity awards granted to non-employee directors under the 2025 RSU Agreements, and to their outstanding awards previously granted under the 2020 Plan. The Amendment does not alter the form or amount of equity compensation granted to non-employee directors, but solely modifies the vesting treatment upon a termination of Board service prior to the applicable vesting date.

The foregoing description of the Amendment is qualified in its entirety by reference to the full text of the Amendment, which is filed as Exhibit 10.20 to this Form 10-K and is incorporated herein by reference.