ChangXin Memory Technologies (CXMT) and Zhipu AI have not only seen their share prices skyrocket, but they have also handed a windfall to their common backer: Alibaba Group Holding. Before the listing of China’s memory-chip giant on Monday, Alibaba owned nearly 5 per cent of CXMT, making it the chipmaker’s largest industrial shareholder, according to the prospectus. Alibaba has invested about 7.6 billion yuan in CXMT since 2021. Based on Tuesday’s closing market capitalisation of about 3.14...