S1 Corp. (SONE) Settles Class-Action Suit from M&A Termination Oct 25, 2011 05:32PM
S1 Corp. (SONE) to Review ACI's (ACIW) Sweetened Proposal Aug 25, 2011 04:54PM
S1 Corporation (SONE) Comments on Unsolicited Bid by ACI Worldwide (ACIW) Jul 26, 2011 05:03PM