CXMT's share price [SHA: 688825] surged 465.8% on its Shanghai Star Market debut today, closing at CNY49 (USD7.22). Turnover topped CNY140 billion (USD20.6 billion), giving the Chinese memory chipmaker a market capitalization of more than CNY3.2 trillion (USD472.8 billion) and making it the most valuable company listed on the mainland stock exchanges.