Suffolk Life has reached £5 billion assets under administration for the first time.
The group's portfolio has doubled since the launch of the MasterSipp in 2007, with assets under administration increasing by £1bn since October 2011.
Commenting on the growth, Greg Kingston, head of marketing, said: "Staff numbers are broadly the same as three years ago, yet as well as looking after a significant number of new SIPPs we've also driven through significant legislative change. That demonstrates efficiency and good scalability to grow our business further in the future."
The group's assets include 2,635 properties valued at around £800 million. £3 billion is invested in collectives and equities, held across a wide variety of investment managers, platforms and execution-only stockbrokers.
Kingston adds "Advisers are rediscovering the value of the independent SIPP wrapper, as more and more of them value not having to advise changing the pension wrapper when they need to change investment manager or platform.
"Running a SIPP business requires delivery of an increasing volume of legislative change, and comes with the certainty that it will be more capital intensive in the future. We expect that environment to continue to feed the appetite of smaller, non-core SIPP operators to seek help running their books."
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