Atom Bank Co-Founder Mark Mullen Steps Down as Chief Executive

Chief financial officer Andrew Marshall will lead the Newcastle-based digital bank on an interim basis while a permanent successor is found.

By North East Founders · Newcastle
Key points
  • Mark Mullen is stepping down after more than a decade as chief executive.
  • CFO Andrew Marshall takes over on an interim basis.
  • Shareholders reportedly shelved a sale this summer after failing to get an acceptable offer.
Durham, where Atom Bank was based before moving its headquarters to Newcastle in 2025.
Durham, where Atom Bank was based before moving its headquarters to Newcastle in 2025. Photo: Alex Liivet / Wikimedia Commons, CC0

Atom Bank co-founder Mark Mullen is stepping down as chief executive after more than a decade in the role. Chief financial officer Andrew Marshall will take over on an interim basis while the bank looks for a permanent successor.

Mullen has been at Atom for almost its entire story, from launching Britain’s first app-based bank to building one of the North East’s best-known technology businesses and, eventually, a profitable bank.

A moment of change

The leadership change comes at a significant time for the bank, which moved its headquarters from Durham to Newcastle’s Pattern Shop last year. After years of considering an exit, first through a stock market listing and more recently through an outright sale, shareholders reportedly shelved a sale process this summer after failing to attract an acceptable offer at a valuation of more than £600m.

Sources: Newcastle Tech Digest. Spotted a mistake? Tell us.