The International Stadia Group are the third bidder wanting to take over the London Olympic stadium after the 2012 Games.[LNB] ISG, which masterminded the premium seats system at Wembley Stadium, is taking on rival bids involving two football clubs, according to Estates Gazette.[LNB]West Ham/Newham council and Tottenham/AEG are also bidding to take over the stadium but the identity of the third bidder has been a mystery until now.[LNB]The Olympic Park Legacy Company are due to inform bidders within the next few weeks whether they have made the shortlist, while a final decision is due in March.[LNB]ISG spearheaded the premium seats system that finally secured the finance for Wembley to be built, with projected revenues from the 'prawn sandwich brigade' seats providing the basis for the Football Association to secure loans of £420million.[LNB]The company also works internationally; it has been involved in stadium projects in Brazil and with Galatasaray's Turk Telekom Arena in Istanbul and the Swebank Arena in Stockholm.[LNB]Their involvement in the new Aviva Stadium in Dublin has had mixed success however, with 6,000 of the 10,400 premium seats remaining unsold as of September.[LNB]ISG were unavailable for comment and it remains unclear whether their plans for the Olympic Stadium include retaining the running track.[LNB]West Ham's bid, backed by UK Athletics, involves retaining the running track.