China's two stock exchanges in Shanghai and Shenzhen shrank by five percent in terms of capitalization last week to 17.21 trillion yuan on Friday, down by 918.8 billion yuan from May 25.

The shrinkage was considered to be the result of the Ministry of Finance announcement late on Tuesday that the stamp tax on securities trading was to rise from 0.1 percent to 0.3 percent from May 30.

Shanghai Stock Exchange reported 13.34 trillion yuan in total capitalization, a drop of 4 percent, while Shenzhen Stock Exchange dropped by 8.4 percent to 3.87 trillion yuan.

The benchmark Shanghai Composite Index, which tracks both yuan-denominated A shares and hard currency B shares, closed at 4,000.74 points on Friday, down by 4.2 percent from the close a week earlier.

The smaller Shenzhen Component Index closed at 12,432.7 points, down 1.96 percent.

Shanghai Stock Exchange has 849 listed companies with 893 share types. Of the 1.13 trillion shares issued at Shanghai, only 262.1 billion are tradable. Shenzhen has 604 listed companies with 646 stocks. Of 254 billion shares floated at Shenzhen, only 132 billion are tradable.

(For more biz stories, please visit Industry Updates)