The £5bn is invested in a diverse range of assets for the firm's 4,000 investors including £800m in Suffolk Life's 2,635 properties and over £3bn in collectives and equities.
This figure is double the number of assets when the firm first launched its Master Sipp in 2007.
Since then the firm has added three different Sipps covering fully bespoke, platform and investment management solutions at a range of different price points.

Greg Kingston, head of marketing, said: "We've been able to sustainably and consistently grow our business without risk to our strong service-led approach. 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."
Mr Kingston said more advisers were choosing Sipps as it meant they did not need to advise on changing pension wrappers.
He said: "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."