Airtel Money debuts on London Stock Exchange, biggest listing in 5 yrs. Airtel Money, the mobile payments business backed by Bharti Enterprises, debuted on the London Stock Exchange on Friday in the bourse's largest initial public offering (IPO) in five years. Its shares initially rose as much as 2.1% before paring gains and slipping nearly 1% below the offer price of £1.96 apiece. The IPO valued the business at approximately £5.3 billion.