Press Release

ACI Worldwide Inc To Release First Quarter 2009 Financial Results

April 22, 2009

(NEW YORK — April 22, 2009) — ACI Worldwide, Inc. (Nasdaq: ACIW), a leading international provider of electronic payments software and solutions, today announced that it will hold a conference call on May 6, 2009 at 8:30 am EDT to discuss the first quarter 2009 financial results. Interested persons may access a real-time audio broadcast of the teleconference at http://www.aciworldwide.com or use the following numbers for dial in participation: US/Canada: (866) 362-7879, International/Local: (706) 634-2207. Please provide your name, the conference name ACI Worldwide, Inc. and conference code 96839292.

Conference Call Scheduled for May 6, 2009 at 8.30 am EDT

There will be an encore replay available for two weeks on (800) 642-1687 for US/Canada Dial-In and (706) 645- 9291 for International Dial-In participants. Conference code 96839292.

About ACI Worldwide, Inc.

ACI Worldwide is a leading provider of electronic payments software and services to major banks, retailers and processors around the world. The company enables online payment processing, online banking, fraud prevention and detection, and back-office services. ACI solutions provide market-leading levels of reliability, manageability and scale, to more than 800 customers in 88 countries. Visit ACI Worldwide at www.aciworldwide.com.

 
 
Investor Contacts

John Kraft, Head of Strategy & Finance
Email: john.kraft@aciworldwide.com

Global Headquarters:
ACI Worldwide
2811 Ponce de Leon Blvd, PH1
Coral Gables, FL 33134