Investor relations

ACI solutions are positioned at the heart of the growing electronic payments market. Our software is highly differentiated in large-scale, complex technology environments and has been proven in the world’s most demanding environments. We license our solutions based on product features, transaction volume and term, and also sell complementary services.

Fourth quarter and full year 2011 financial results

ACI Worldwide held a conference call on Tuesday, February 14, 2011 at 8:30 AM ET to discuss fourth quarter and full year 2011 financial results.

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ACI completes acquisition of S1 Corporation

(New York, N.Y. – February 13, 2012) – ACI Worldwide, Inc. (Nasdaq: ACIW), a leading international provider of payment systems, today announced that it has accepted for payment all shares of S1 Corporation (Nasdaq: SONE) common stock tendered in the previously announced exchange offer.

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ACI Worldwide and S1 Corporation announce the DOJ is closing its investigation

NEW YORK and NORCROSS, Ga., February 3, 2012 – ACI Worldwide, Inc. (Nasdaq: ACIW) and S1 Corporation (Nasdaq: SONE) today announced that the U.S. Department of Justice (the “DOJ”) has informed them that the DOJ is closing its investigation in connection with the proposed acquisition of S1 by ACI. As previously announced, the expiration date of ACI’s exchange offer for all of S1’s outstanding common shares is 5:00 p.m., Eastern time, on Friday, February 10, 2012.

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