PensionBee Group PLC, the pension app developer, will be valued in a range of £346mln to £384mln, when it lists in London later this month.
The price of the offer has been set at between 155p to 175p with the company aiming to raise £55mln in new money.
Digital-based PensionBee added that assets Under Administration (AUA) in the year to end-March 2021 grew by 123% year on year to £1.65 bn.
Active Customers grew by 77% year on year to approximately 137,000 and Invested Customers grew by 81% year on year to approximately 81,000.
Revenues rose by 77% to £6.3mln, but the business remains loss-making.
"Becoming a publicly traded company has long been part of our strategy to be the best universal online pension provider and I am delighted to confirm PensionBee's intention to float,” said chief executive Romi Savova.
A total of 35.5mln shares will be sold in the offer, with existing shareholders selling 2.81mln, though none of the founders, directors, senior management are selling.
Prior to the float, Savova owned a 45% stake and she alongside other founders including CTO Jonathan Parsons have agreed to a 720-day lock-up before they are allowed to sell any shares.
Customers will be offered a chance to buy shares through an offer by PrimaryBid, with 12,000 registering so far.
PensionBee has developed an app that lets people consolidate their pensions and manage them digitally.
“There is a significant growth opportunity for PensionBee, as a result of the acceleration of the shift to digital, the frequency of individuals moving jobs and the increased duration of working life,” Savova added.