Lock-up shares worth 44.96 billion yuan (7.32 billion U.S. dollars) will become eligible for trading this week in China, according to data from the country's bourses. The volume marked a surge from the 14.6 billion yuan worth of shares that became tradable last week, according to the Shanghai and Shenzhen stock exchanges. Altogether, 2.41 billion lock-up shares of 23 listed companies will be released to the capital market after agreements expire, accounting for 0.59 percent of the total lock-up A-shares. 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 sell their shares.