Dentons has reported a record breaking first quarter for new business, with transfers from other Sipp operators cited as a key factor.
The firm said new business figures were up 47% compared to the same period last year.
There was also an increase in turnover for the first quarter of 15% across the group.
Dentons reported that investment portfolios pushed commercial property into second place as the primary reason for the Sipp establishment in the first quarter this year. This has reversed a two year trend, it said.

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David Fox, director of sales and marketing, said: "It is pleasing to note the number of new introducers that have started to use us for the first time in the last 12 months and also the volume of cases that are transfers from existing Sipp operators.
"It is clear advisers are spending more and more time undertaking due diligence on the firms they partner with, in particular focusing on the financial strength and commitment that they show in the run up to the introduction of the new capital adequacy rules."
The company has total assets within its pension portfolios of over £2.7bn.
Mr Fox added: "Advisers have previously seen us as a specialist in property and non standard asset classes but increasingly we are being used for the less complex cases where attention to detail is still so important to the adviser and their client."
Mr Fox said he expected the growth in the Sipp market to continue to grow with the new pension freedoms available to consumers.