Forget the World Cup. Betting on the competitors in the AI race is the real gamble this summer and autumn. Two more major groups involved in this ground-breaking technology will be vying for investors' cash in the coming months. The response to the $1.8 trillion (£1.3trillion) SpaceX share sale shows that, this summer, investors have a taste for initial public offerings (IPOs). Fortunately, two more mammoth tech flotations are on their way.