The payments processor will issue a public offering of 160 shares of Class A common stock at between $18 and $20 per share.
The processing platform provider in Southern California now claims more than half of the country's Top 100 credit unions.
As many as 60 competitive core conversions are up for grabs this year.
Popular investment advisory website recommends FIS as a good investment opportunity.
The payments processor attracts more money from existing investors and picks up new ones.
CU*Answers said it has finished converting the $43 million, 5,800-member Greensboro Municipal Federal Credit Union to its CU*BASE core processing system.
Share One said the $71 million Northern Communities Credit Union of Duluth, Minn., plans to convert to its NewSolutions core processing system in October.