Shanghai stock exchange today takes over from London. - For the third consecutive month, equity market capitalisation of all the companies quoted on the Shanghai stock exchange weighs more heavily than that of London. At the end of April, the Shanghai Stock Exchange (SSE) struck up total market capitalisation of about $1 949 billion compared to $1 946 billion announced by the London Stock Exchange. End April, the ten leading stock operators worldwide were: 1) Nyse Euronext (United States)...