Lock-up shares worth 30 billion yuan (4.91 billion U.S. dollars) will become eligible for trade next week in China , according to information from China's stock exchanges.

The volume marks a slight increase from the 26.6 billion yuan seen from Dec. 9 to 13.

Altogether, 22 listed companies on the Shanghai and Shenzhen stock exchanges will see 2.16 billion of their shares released to capital markets after lock-up agreements expire.

Under China's market rules, major shareholders of non-tradable stocks are subject to one or two years of lock-up before they are permitted to trade.

Of all the companies with non-tradable shares becoming tradable next week, Chinese Universe Publishing And Media Co., Ltd. has the most -- 380 million non-tradable shares worth 6.96 billion yuan.