Company: ACIW
Filing Date: 2025-04-21
Form Type: DEF 14A
Source: 0001193125-25-086263
Chunk: 4

Company: ACI WORLDWIDE, INC.
Filing Date: 2025-04-21
Form: DEF 14A
Chunk 4
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 your proxy card or the Internet Availability Notice. |

| • |     | To vote during the Annual Meeting, you must do so through www.proxydocs.com/ACIW. To be admitted to attend the Annual Meeting and vote your shares, you must register and provide the Control Number as described in the Internet Availability Notice or proxy card. After completion of your registration, further instructions, including a unique link to access the Annual Meeting, will be emailed to you. |

2025 PROXY STATEMENT 3

Beneficial Owner: Shares Registered in the Name of a Broker or Bank See “Who can vote at the Annual Meeting?” for voting instructions if you beneficially own shares held in street name. How many votes do I have? On each matter to be voted upon, you have one vote for each share of Common Stock you own as of the close of business on April 8, 2025. What if I return a proxy card but do not make specific choices? If you return a signed and dated proxy card without marking any voting selections, your shares will be voted as follows:

| • |     | “For” the election of each of the eight nominees for director; |

| • |     | “For” the ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for 2025; and |

| • |     | “For” the approval, on an advisory basis, of the compensation of our named executive officers. |

If any other matter is properly presented at the meeting, your proxy (one of the individuals named on your proxy card) will vote your shares using his or her best judgment. Who is paying for this proxy solicitation? ACI will pay for the entire cost of soliciting proxies, including the preparation, assembly, printing and mailing of the Internet Availability Notice, this Proxy Statement, the proxy and any additional solicitation materials that ACI may provide to stockholders. Copies of the proxy materials and any other solicitation materials will be provided to brokerage firms, banks, fiduciaries and custodians holding shares in their names that are beneficially owned by others so that they may forward the solicitation materials to such beneficial owners. ACI will reimburse such brokerage firms, banks, fiduciaries and other custodians for the reasonable out-of-pocketexpenses incurred by them in connection with forwarding the proxy materials and any other solicitation materials. In addition to ACI mailing these proxy materials, the Internet Availability Notice and the Annual Report (as applicable), AC