Feb. 6, 2007 (China Knowledge) – China's Securities Regulatory Commission (CSRC) said it had completed an investigation into insider trading by senior management at publicly listed companies, another indication that authorities in China are concerned about a stock market bubble.

The regulator yesterday said it had already drafted new regulations on management stock purchases and trading, to be announced at an "appropriate time".

The Shanghai Composite Index fell 2.27% yesterday to 2,612.54 points, continuing a slide that saw it drop more than 9% last week. In the past week, the market value of China's listed stocks tumbled by 7% with share prices suffering several huge blows for the five trading days.