John Spiegel

  • ACI Buys S1 Corp.

    After rejecting its initial bid this summer, S1 Corp. has agreed to be acquired by ACI Worldwide Inc., the electronic payments and online banking companies said.

  • ACI Worldwide Buys S1 Corp.

    ACI Worldwide Inc. will buy S1 Corp., the companies announced Monday, and combine their global payments and online banking presence.

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