Atom Bank has appointed a new chief financial officer from within after co-founder David McCarthy stepped down last month.

McCarthy is leaving the digital bank after managing its finances since it was founded eight years ago. He said he was tired from the 250-mile trip to Durham.

Andrew Marshall, who has worked at the bank for more than six years as group financial controller, deputy finance director and corporate finance director, will take over ahead of a potential public listing next year.

Atom is in the process of appointing investment banks to work on it an IPO is planned.

Chief executive Mark Mullen said Atom, which has total customer deposits of more than £2.5bn and has announced mortgage repayments of more than £3bn, is owned by McCarthy “as much as anyone will own it”.

He set the task of significantly increasing these numbers in the coming years.

Atom also recently appointed Andy Storok and Rebecca Cartwright as CTO and Chief Risk Officer, respectively.

“We’ve made other changes in recent months to re-energize the senior team as we continue to grow our business,” Mullen said.

“All companies need to move from ‘startups’ to ‘beginners’ and Atom is well on that path.”

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Atom Bank appoints CFO to replace co-founder