The cloud computing giants are vying to protect fat profits

When chief executives ring the closing bell at the Nasdaq stock exchange in New York, it is usually because their firm has just gone public. When Adam Selipsky did so on June 27th, he was celebrating a tie-up with the bourse. He is the boss of Amazon Web Services (aws), the tech giant’s cloud-computing arm, and the deal is part of the exchange’s shift of its stockmarkets to aws’s cloud. Tailored features include data transfer with…