SHANGHAI B-shares advanced 2.2 per cent yesterday on trading dispersed widely across the board, according to traders. The gainers were led by Chlor Alkali, which was the most actively traded stock, accounting for 16 per cent of market turnover of US$3.86 million. Chlor Alkali, which has found favour in recent days after a string of losing sessions, finished 7.6 per cent up at 31 cents. Jinqiao also had a good day, gaining 6.7 per cent to 80 cents. The Credit Lyonnais B-share index put on 17.46 points to close at 828.54. The A-share index made another huge leap, of 672.17 points, or 22.08 per cent, to close at 3,716.14. Analysts said the rise was on expectations that securities authorities would announce new measures to boost the market, bringing gains for the week to a whopping 113.5 per cent. ''Everyone is expecting the meeting to announce good news for the market,'' said Zhang Yuyin, a trader with Shenzhen's Pingan Insurance Co. Traders said they expected a joint press conference to be held in Beijing by the China Securities Regulatory Commission and both the Shanghai and Shenzhen stock exchanges. ''Although we often hold press conferences on a Friday afternoon, today we are not having one,'' said Suo Lihui, an official with the regulatory commission's international department. ''Big institutions are still buying, but it is getting a bit hot for small investors,'' a floor trader said. ''Everyone has gone a little crazy and something has to give soon,'' Mr Zhang said. Traders say large institutions are bidding up shares in the belief that the index can only climb higher when China moves to establish more mutual funds and a firm institutional base to support the market. The regulatory commission last Friday announced its intention to take the steps, sparking the A share rally. China's securities authorities have also said they will halt new A-share listings and permit joint-venture investment funds which will give foreign investors access to the market. The measures were aimed at reviving the market, which had fallen more than 70 per cent in less than a year.