ACI Urges Shareholders to Vote Against the Fundtech Transaction

ACI Worldwide, Inc. ACIW, a leading international provider of payment systems, today filed an investor presentation with the Securities and Exchange Commission. The presentation provides information regarding ACI's proposal to acquire S1 Corporation SONE and the reasons why ACI believes that S1 shareholders should vote against the transaction with Fundtech Ltd. FNDT at S1's special meeting on September 22, 2011.