BEIJING - The value of lock-up shares becoming eligible for trade on China's stock market this week will amount to 68.7 billion yuan ($11.1 billion), according to data from the country's two stock exchanges.

The volume marked a sharp increase from the 13.9 billion yuan seen from July 28 to Aug 1.

Altogether, 18 listed companies on the Shanghai and Shenzhen stock exchanges will see their lock-up shares released to the capital market.

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 the shares.

Ping An Bank will see non-tradable shares worth 33.6 billion yuan become tradable on Tuesday, the largest amount of such shares to hit the stock market this week.

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