The app-based bank is preparing to approach backers to shore up its balance sheet against early-stage losses and regulatory capital requirements.
Atom began accepting deposits earlier this year and is planning to start mortgage lending in coming months.
If successful it’s understood the latest funding round would take Atom’s total capital raised to £235m. The news of the latest funding round was first reported by Sky News.
It’s thought the latest raising will see Atom return to existing backers.
Spanish bank BBVA is among Atom’s early investors, committing £45m for a stake of almost 30 per cent.
Atom was set up by two of the retail banking industry’s most prominent executives: Metro Bank co-founder Anthony Thomson and former First Direct chief executive Mark Mullen.
The rise of online-only lenders comes as high street banking giants rush to shutter branches around the country to minimise costs.