ACI Worldwide, Inc. (NasdaqGS:ACIW) is in talks with private equity firms about a potential sale, according to people familiar with the matter. The company is working with financial advisers as it fields takeover interest, said the people, who asked to not be identified because the matter isn't public. There's no certainty ACI will reach a deal given the rocky state of the leveraged financing markets, one of the people said.

A representative for ACI declined to comment.