BEIJING, July 20 -- The value of lock-up shares becoming eligible for trade on China's stock market this week will dip from the previous week, according to data from the country's two stock exchanges.

From Monday to Friday, 22 listed companies on the two bourses will see shares worth 23 billion yuan (3.74 billion U.S. dollars) released to the market after lock-up agreements expire.

The value represents a minor decline compared to 24.86 billion yuan the previous week.

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

On Friday, the benchmark Shanghai Composite Index gained 0.17 percent from the previous trading day to finish at 2,059.07 points. The Shenzhen Component Index went up 0.9 percent from Thursday to close at 7,259.45.