BEIJING - Lock-up shares worth 37.5 billion yuan (6.13 billion US dollars) will become eligible for trade next week on the Chinese mainland.

The volume marks a huge rise from the 30 billion yuan seen from December 16 to 20, according to information from the Shanghai and Shenzhen stock exchanges.

Altogether, 20 listed companies on the two stock exchanges will see their lock-up shares released to capital markets next week.

Under the mainland'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.