ACI Worldwide Announces Preliminary Results of Exchange Offer

ACI Worldwide, Inc. (Nasdaq: ACIW), a leading international provider of payment systems, today announced the preliminary results of its exchange offer to acquire S1 Corporation (Nasdaq: SONE), which expired at 5:00 p.m., Eastern time, on February 10, 2012. Based on the preliminary calculation performed by Wells Fargo, the exchange agent for the exchange offer, a total of 52,871,149 shares of S1 common stock were validly tendered, which includes 3,073,394 shares tendered through notice of guaranteed delivery, and not withdrawn, representing approximately 95.3% of S1's outstanding shares.