Investors made a marked move towards the Cautious Managed sector last month, at the expense of corporate bond funds, which continued to fall in popularity.
The RDR will strengthen the appeal of passive funds as advisers move towards a fee-based structure, says Cofunds.
The UK Platform Group, formed from the UK's biggest platform providers, will agree implementation of a new re-registration solution over the next six months, with full roll-out to meet the RDR deadline at the end of 2012.
Corporate bonds continue their reign at the top of the sales charts, accounting for around one quarter of net sales in May, according to the latest figures from Cofunds.
Suffolk Life has signed a deal with Cofunds to remove initial charges on all funds available through the platform.
Cofunds broke into the black for the first time in its history last year, posting an operating profit of £400,000.
Cofunds has made changes to its senior management team to drive the next phase of its business.
Pictet Funds has added several Luxemburg-domiciled funds to the Cofunds platform.
Cofunds had added Suffolk Life's MasterSIPP to its platform, which it says will help advisers consolidate pension arrangements in a single place.
JPMorgan Asset Management (JPMAM) has teamed up with Cofunds to offer ten Luxembourg-domiciled funds via the platform.