Insignia Financial, the ASX-listed wealth group that owns the 138-year-old MLC brand, lost the most retirement savings to rival superannuation providers as customers moved to industry funds and into self-management.

Some $74 billion of retirement money moved between funds in the 12 months to June 30, up 6 per cent on the previous year, according to figures analysed by Conexus Institute, a wealth industry think tank.