The Honolulu company said the "non-public, fact-finding inquiry" by the Securities and Exchange Commission focuses on its calculations for earnings per share.
Elizabeth Fischmann will take on the role later this month and will oversee the regulator's compliance with federal ethics laws, among other responsibilities.
The company falsely advertises its cash advances as requiring no collateral or personal guarantee, according to a lawsuit filed by the Federal Trade Commission.
A New Jersey jury has put banks and other businesses on notice about their liability for incidents involving clients who mistreat employees in the workplace.