Betfair, a UK-based online gaming exchange backed by Japan-based conglomerate Softbank, is planning its flotation on the London Stock Exchange later this year.
Softbank bought 23% of Betfair for £355m ($556m) in February 2006 following its aborted attempt to float.
Its latest planned initial public offering would reportedly value the company at about £1.5bn and see half its group of 14 largest shareholders sell stock.