James Hay Partnership has struck a deal that will lead to it taking on Capita's Sipp book.
The platform for retirement wealth planning will also work with Capita to take on the Sipps of a number of their major corporate partners.
Chief executive Alastair Conway said: "We've worked hard with Capita to make sure that the business we receive comes onto James Hay Partnership in the same way as our new organic business.
"The move will give clients access to an extremely advanced and scalable IT system, as well as our sophisticated product and investment solutions.
"As we will manage the project through a new dedicated team, it will not impact existing customers and our current client service levels, which will remain a priority."
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He promised an enhanced service for new customers, and a "favourable outcome for the other organisations involved" as well as processing the business in the most efficient way.
Once transferred across, clients and advisers will be able to access the online management portal, online trading capability, performance reporting and a range of interactive drawdown facilities. They will have access to a dedicated account executive.
James Hay and Capita will create a dedicated team to manage the transfer in a "seamless and controlled manner" with completion due by the end of Q1 2015.
James Hay to take on Capita's Sipp book
