Atos pulls out of RBS unit sale

French software group Atos Origin has pulled out of a bidding race for Royal Bank of Scotland’s WorldPay payment-processing arm. People familiar with the matter have said that parties interested in WorldPay, which is valued at $4bn (£2.8bn), now include Clayton; Dubilier & Rice; American Express and Permira; Advent International and Bain Capital; Canada's Moneris Solutions; and US buyout group TPG. RBS?must sell off non-core assets because it received state aid.