The Shanghai Composite Index went up by 65% since July 1, 2014. On Jan 19, the Shanghai Index went down by 7.7% as Securities Regulatory Commission placed a 3 month bad on margin financing at brokerage firms Citic Securities, Haitong Securities and Guotai Junan Securities. All large state owned brokerage firms which were found to have violated securities rules on margin financing. Analysts say that the action by the regulator was to control risk on the stock market and give the the central bank, the People's Bank of China more room for monetary easing without negative side effects in the stock market, which had an extraordinary jump of 38% in the last 3 months. Margin financing has more than doubled in the last 6 months and accounted for 18% of average daily trading volume, according to an analyst at Credit Suisse.