Shares of ChangXin Memory Technologies (CXMT), China’s leading DRAM maker, jumped 12 per cent on Monday to close at a record 61.80 yuan (US$9.16), lifting its market capitalisation to 4.13 trillion yuan and extending its lead as China’s most valuable listed company. The Hefei-based chipmaker first overtook Hong Kong-listed Tencent Holdings on Thursday as China’s most valuable listed company, when CXMT’s market value reached about 3.54 trillion yuan. It had already become the most valuable...