
October 6, 2009

(New York, N.Y. – October 6, 2009) – ACI Worldwide, Inc. (Nasdaq: ACIW), a leading international provider of electronic payments software and solutions, announced that it will be presenting at the William Blair Emerging Growth Stock Conference at the Waldorf- Astoria Hotel in New York today at 2:00 pm EDT. Our presentation will be webcast via www.aciworldwide.com/investorrelations.
ACI Worldwide, Inc. has also updated its guidance metrics for the calendar year 2009. The company now anticipates GAAP operating income improvement of approximately 5-10% above the previously disclosed $35 million, a potential decrease of up to 2% in GAAP revenues of $415 million driven by timing risk related to approximately 5-8% in Sales bookings of $450 million in the second half of the year.
About ACI Worldwide, Inc.
ACI Worldwide is a leading provider of software and services solutions to initiate, manage, secure and operate electronic payments for major banks, retailers and processors around the world. The company enables payment processing, online banking, fraud prevention and detection, and back-office services. ACI solutions provide agility, reliability, manageability and scale, to approximately 750 customers in 90 countries. Visit ACI Worldwide at www.aciworldwide.com.
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For more information contact:
Tamar Gerber
Vice President, Investor Relations & Financial Communications
Telephone – 646-348-6706
Email Address- tamar.gerber@aciworldwide.com


