BEIJING — Lock-up shares worth about 34.8 billion yuan ($5.1 billion) will become eligible for trading on the Shanghai and Shenzhen stock exchanges in the coming week.

The amount is 38.6 percent more than last week, according to data compiled by Chongqing-based Southwest Securities.

Lock-up shares from 35 listed companies will become tradable from July 17 to 21, with the peak share unlocking period falling on Monday, it said.

Under China's market rules, major shareholders must wait one to two years before they are permitted to sell their shares.

Chinese stocks staged a mixed performance Friday, with the benchmark Shanghai Composite Index rising 0.13 percent to close at 3,222.42 and the smaller Shenzhen Component Index closing 0.37 percent lower at 10,427.79.