(Bloomberg) -- Alibaba Group Holding Ltd. jumped on Monday, leading a rebound in Chinese tech firms listed in the U.S., after the company announced a management shakeup and policy makers in Beijing stepped up support for the nation’s economy. American depositary receipts for the Chinese tech giant rallied 10.4%, the most since June 2017. The gain follows news that long-standing chief financial officer Maggie Wu will be replaced in April by Toby Xu, who joined the firm from PricewaterhouseCoopers LLP three years ago. Meanwhile, the People’s Bank of China said it will reduce most banks’ reserve requirement ratio by 0.5...