Press Release

ACI Worldwide increases offer for S1 Corporation

August 25, 2011

“ACI is committed to taking the necessary actions to complete our proposed acquisition of S1, and we believe today’s action is the next step forward in this process,” said Philip G. Heasley, President and Chief Executive Officer of ACI.  “Given the uncertain and volatile market conditions, we have enhanced the cash component of our proposal to provide additional certainty and value for S1 shareholders.”

ACI’s proposal represents a 30% premium to S1’s market price on July 25, 2011, the last trading day prior to the public announcement of ACI’s proposal, a 29% premium to the volume weighted average price of S1 shares over the previous 90 days prior to the announcement and a 20% premium to the 52-week high of S1 shares, for the 52-week period ending July 25, 2011.

ACI anticipates that the proposed transaction could close as early as the fourth quarter.  The Company has secured committed financing from Wells Fargo Bank, N.A. for the cash portion of the transaction and has offered to provide S1 with a copy of a commitment letter upon request.  In addition, to resolve any potential barriers to consummating a transaction, ACI has reiterated to S1 that it is willing to provide appropriate assurance of satisfaction of the Hart-Scott-Rodino Act condition, including a divestiture commitment (if required) and substantial break-up compensation.

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Contact details

Investor Contacts

Tamar Gerber
Vice President, Investor Relations & Financial Communications
(646) 348- 6706

Art Crozier / Jennifer Shotwell / Scott Winter
Innisfree M&A Incorporated
(212) 750-5833

Media Contacts

James Golden / Scott Bisang / Aaron Palash
Joele Frank, Wilkinson Brimmer Katcher
(212) 355-4449

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