Provident, led by Malcolm Le May, has rejected the bid saying it is too risky and could put customers at harm.
NSF, led by John Van Kuffeler, said new management is required at the firm, which has suffered for over a year after a plunge in the share price.
Goodbody’s financial analyst John Cronin said the latest salvo from Provident was significant. “Questions will be asked about how comfortable the regulators would be with the NSF management team if they are found to have breached company law,” he said.
The FCA regulates Provident Financial and NSF. It did not comment today.