Martin Tilley, head of technical support at Dentons Pensions, has forecast that "a third to a quarter" of Sipp providers could quit the market in the next few years.
Sipp provider Hornbuckle Mitchell has cut its Sipps set-up fees by 30 per cent to celebrate its 30th anniversary.
Sipp provider and Institute of Financial Planning sponsor Suffolk Life has reached £5bn in assets under administration this month.
Sipp provider Suffolk Life is holding a series of seminars nationwide to help financial advisers understand Sipps.
Sipp provider Mattioli Woods has seen its revenue increase by 33 per cent to £20.5m, up from £15.4m in 2011.