S1 Corporation was an American software development company based in Norcross, Georgia which specialized in payment processing and financial services software for automated teller machines and retail point of sale applications, primarily for banks, retailers and credit unions.
[1][2][3] S1 Corporation was acquired by a competing payment software company, ACI Worldwide, Inc., during October 2011 for $9.95 per share.
[4] S1 Corporation was originally the technology division of Security First Network Bank.
Johann Dreyer, originally CEO of Mosaic Software, became S1's last chief executive officer in 2006, serving until S1 was acquired by ACI Worldwide in 2012.
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