State regulators filed a court challenge Oct. 25 to the Office of the Comptroller of the Currency’s plan to grant a bank-like charter to fintech companies.

The Conference of State Bank Supervisors isn’t waiting for a fintech company to file an application, saying the fact the OCC made the charter available on July 31 makes their challenge ripe.

The CSBS complaint in the U.S. District Court for the District of Columbia re-ups a 2017 challenge state regulators brought against the...