Platform Nucleus is listing on the Alternative Investment Market in a deal that could value it around £150m.
Dealings in the shares are expected to start on AIM later in July.
Reports emerged in March Nucleus was considering listing on the London Stock Exchange and had appointed a broker to oversee an IPO.
Sky News reported last week the float could value the company around £150m.
Nucleus had been eyeing a float in 2016, but withdrew its plans after feedback from advisers suggested they should concentrate on innovation and efficiency improvements before any listing.
Nucleus has more than 2,200 adviser users across 800 firms and is responsible for assets under administration of £14.3bn on behalf of more than 90,000 customers as at 31 May 2018.
Since the end of 2012, assets under administration in the advised platform market has grown from £123bn to around £350bn and is projected to grow to £745bn by the end of 2021.
Nucleus chief executive David Ferguson says: “Nucleus has been an exciting journey so far and we expect this admission to AIM to mark an important milestone in the business’s maturity and to open up new opportunities for us.
“We remain committed to keeping adviser/client alignment and transparency at the heart of what we do and to continue developing a market-leading platform and best in class customer service to deliver on our objectives.”
Nucleus recently reported a 19 per cent increase in operating profit to £5.1m for the 12 months to 31 December 2017.