Suffolk Life has acquired the Sipps book of Leeds-based wealth management firm Pearson Jones Plc.
This will include 280 Sipp plans following Pearson Jones's decision to wind-up its Skipton (Pearson Jones) Sipp and Net Sipp plans.
Pearson Jones will remain as the financial adviser to the investors.
Suffolk Life is making the acquisition using its own profits and the deal follows the acquisition of around 1,700 Sipps from Pointon York in November.
Suffolk Life, a corporate member of the Institute of Financial Planning, said it remained strongly capitalized ahead of the FSA capital adequacy changes at the end of 2013.
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David Hobbs, managing director of Suffolk Life, said: "The acquisition of the Sipp book from Pearson Jones underlines our commitment to grow our business both organically and through the right acquisitions. The Pearson Jones clients and approach fits well into the bespoke end of our proposition and should add around 280 additional Sipps."
Deputy managing director at Pearson Jones Plc, Leeds, Peter Heckingbottom, said: "Sipp administration is a specialist ancillary function and, as a small administration operator, the new regulatory burden would mean that we would need to charge clients far more than the market rate if we were to continue and so we have decided to exit."