Following the Financial Conduct Authority's platform paper last week, Cofunds has announced its intention to offer 3,000 clean share classes by July.
The firm already has 2,700 clean share classes available after it begun offering them back in September 2011.
Some 10 new funds groups have gone live since the start of 2013 with two more due in May and six in the coming months.
Michelle Woodburn, head of fund manager relations at Cofunds, said: "Moving to cleaner share classes makes things simpler for everyone- the adviser agrees a fee with the investor and the platform clearly states what the investor will be charged for the service provided."
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She said following the announcements by the FCA and HMRC, there would be no choice but for firms to offer clean share classes.
In April, HMRC announced that rebates would be taxable while last week, the FCA announced that it would be banning rebates from April 2014.
Ms Woodburn said: "Our target of reaching 3,000 by July is right on track. It comes at a time when others are barely out of the starting blocks on adopting clean share classes - and this despite all signs pointing to the regulator moving the market in a 'clean' direction.
"Even if HMRC's move to tax rebates at source wasn't impetus enough for others finally to embrace clean, there's no ignoring PS13/1."

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