Light Street Capital Management, the $1.1 billion hedge fund founded by Tiger Cub Glen Kacher, gained 42.6 percent in the first five months of the year on technology bets. Light Street’s flagship fund rose 11 percent in May, according to a person familiar with the matter. Wagers on e-commerce firms Shopify Inc., Square Inc. and Amazon.com Inc. as well as China’s Tencent Holdings Ltd. and Momo Inc., a social media company, contributed to returns, the person said. The hedge fund, which focuses on telecommunications, media and technology stocks, is one of a handful to outperform the market in tech stocks this...