Suffolk Life has reported business passing the milestone of £6 billion in assets under administration in September.
The average fund size of Suffolk Life Sipps exceeds £300,000, a number that continues to steadily increase, says the company which is part of L&G.
Will Self, Suffolk Life's managing director, said: "Broadening our proposition beyond the traditional bespoke Sipp market has provided a strong foundation to meet the challenges ahead, including the highly anticipated outcome of CP12/33 expected to be published by the FCA next month.
"The business remains strongly capitalised in preparation and is on course to improve on our record-setting 2012."
Greg Kingston, head of marketing & proposition, added: "Recent surveys have revealed the bespoke Sipp market is in a state of – limited growth with many operators reporting their books contain in excess of 40 per cent non-standard assets and some seemingly unaware of where they stand. Those are higher risk businesses, as advisers' due diligence checks will show."
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Despite holding nearly 3,000 commercial properties, less than 20 per cent of Suffolk Life's book is invested in non-standard assets. Property represents the largest non-standard asset class (12 per cent of overall assets), followed by fixed term deposits (2 per cent of overall assets).
Mr Kingston concluded: "The timing of the recent FCA announcement of a further Thematic Review of Sipp operators is sensible and should tie in well with the outcome of CP12/33, expected next month."