Bidders are thought to include Cinven, Advent International, KKR and Clayton Dubilier & Rice, The Telegraph reported. The sale could fetch over £500m, it said.
In June it was reported that was looking at a potential £700m IPO, as well as considering a refinancing.
Charterhouse bought the UK retail chain, which has 650 stores, in March 2010 in a deal thought to be worth close to £350m.
Earlier this year AltAssets reported that Charterhouse was considering a 12 month extension to the investment period of its €4bn ninth fund.
Copyright © 2013 AltAssets