IG Group, a spread-betting specialist founded in 1974, has been listed in London for 26 years - Chris Batson/Alamy One of Britain’s largest trading groups is considering quitting London to tap into the prediction betting craze in the US. IG Group, a spread-betting specialist founded in 1974, on Thursday announced a review which will include the possibility of shifting its domicile and listing venue overseas. The company said it was considering the move to keep up with prediction betting giants such as P ...