Shares of three Chinese companies hit by a regulatory crackdown on the tech sector soared in premarket US trading following signs that Beijing was lifting a probe that slammed the brakes on their operations. Ride-hailing platform Didi Global, job recruiting platform Boss Zhipin, and Full Truck Alliance—dubbed “Uber for Trucks”—were barred from registering new customers during a yearlong investigation by China’s cyberspace watchdog. But, as of Monday evening, Full Truck Alliance’s apps Yunmanman and Huochebang were taking on new customers for the first time in 11 months. The Wall Street Journal, citing unnamed sources, reported Monday that both Didi and...