Financial comparison website has been valued at £1bn in advance of the planned share offering on July 31.
The FT reports that Moneysupermarket plans to sell around 40% of the company's shares to pay off debts and release capital. Shares will be priced at between 170p and 210p.
Co-founder Simon Nixon is expected to make up to £200m from the flotation. Earlier this year, he paid £162m for co-founder Duncan Cameron's stake in the firm.
Moneysupermarket.com is the largest financial comparison site in the UK, with around 4m users and a 49% share of the market. Last year's turnover was £104.5m, up from £68m in 2005. The site attracted 64m visitors in 2006.
The company operates two sites, moneysupermarket.com and travelsupermarket.com, with a combined 64m visitors and 523m page views last year. The firm's directors and staff will retain 50% of the equity after the flotation.
Rival comparison website Confused.com is reckoned to be worth around £600m, and Admiral has recently received several approaches from interested buyers.