In total Atom has provided 21,700 mortgage offers worth £3.97bn.
Atom Bank has exceeded £3bn of residential mortgage completions since it launched in November 2016.
In total Atom has provided 21,700 mortgage offers worth £3.97bn with 16,400 households completing on new mortgages to a total value of £3bn.
At the same time the app based bank has hit the milestone of £1bn in deposits into its instant saver accounts.
Edward Twiddy, chief customer officer at Atom, said: “These milestones are significant achievements for Atom. We are here to solve two key questions for customers – where should I save to get a proper return on my savings, and where can I get a well priced mortgage that I can manage on my terms.
"We don’t carry excess costs in our business and so in a price lead market we can pay our savers more and charge our borrowers less; that has to be better for everyone, and the progress we continue to make suggests that we are getting a lot right.
“Alongside our rapidly growing commercial mortgage lending and our partnership with Funding Circle, the continued growth of our mortgage book means that Atom is very well set commercially.
"A sustainable business relies on being commercially strong as well as playing its role in the wider community; we will continue to do both as we set our sails towards an IPO, which we anticipate taking place in the next two years.”