Company: ACIW
Filing Date: 2025-04-21
Form Type: DEF 14A
Source: 0001193125-25-086263
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Company: ACI WORLDWIDE, INC.
Filing Date: 2025-04-21
Form: DEF 14A
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 About ACI ACI Worldwide, an original innovator in global payments technology, delivers transformative software solutions that power intelligent payments orchestration in real time so banks, billers, and merchants can drive growth, while continuously modernizing their payment infrastructures, simply and securely. With 50 years of trusted payments expertise, we combine our global footprint with a local presence to offer enhanced payment experiences to stay ahead of constantly changing payment challenges and opportunities. In this Proxy Statement, the terms “ACI,” the “Company,” “we,” and “our” refer to ACI Worldwide, Inc. This Proxy Statement contains a report issued by the Audit Committee relating to certain of its activities during 2024 and a report issued by the Compensation and Leadership Development Committee relating to executive compensation during 2024. Stockholders should be aware that under Securities and Exchange Commission rules, these committee reports are not considered “filed” with the Securities and Exchange Commission under the Securities Exchange Act of 1934 and are not incorporated by reference in any past or future filing by ACI Worldwide, Inc. under the Securities Exchange Act of 1934 or the Securities Act of 1933, unless specifically referenced. Additionally, the information contained on aciworldwide.com is not incorporated by reference into this Proxy Statement. These materials were first made available to stockholders on April 21, 2025. Date, Time and Place of Meeting

| When:        
 Where:       |     | June 3, 2025                                                                                                        
 10:00 a.m. Eastern Time                                                                                             
 Via a live audio-only webcast at www.proxydocs.com/ACIW. There is no physical location for the 2025 Annual Meeting. |
|:-------------|:----|:--------------------------------------------------------------------------------------------------------------------|
| Record Date: |     | April 8, 2025                                                                                                       |

This Proxy Statement is being furnished in connection with the solicitation by and on behalf of the Board of proxies to be used at our 2025 Annual Meeting of Stockholders, and any postponement or adjournment thereof. A copy of our annual report on Form 10-Kfor the fiscal year ended December 31, 2024 (the “Annual Report”), accompanies this Proxy Statement. 2025 PROXY STATEMENT 1

| Annual Meeting Proposals |     |                                                                              |     |                          |
| Proposal                 |     |                                                                              |     | Recommendation           
 of the Board             |
| 1.                       |     | Election of directors                                                        |     | FOR Each of