CHESTER-based price comparison website moneysupermarket.com is believed to be in discussions with private equity houses over a possible sale.
Weekend reports claim that founder Simon Nixon, who owns 52.5% of the business, has said he is interested in considering offers.
Earlier this year he indicated he had no interest in selling out.
But he has confirmed that investment bank Credit Suisse is advising the business after a number of approaches from possible buyers.
It is believed Mr Nixon has put a £600m valuation on the company.
Bidders are believed to include private equity firm Apax, which it is understood has already met with moneysupermarket.com chairman Gerard Corbett about a possible acquisition.
Shares in the Chester company have risen 19% over the past six months.
They were 85.65p at the close of trading on Friday, which would value the business at £436m.
