About 2.5 billion shares will become tradable on the Shanghai and Shenzhen stock exchanges on Monday and Tuesday, according to data from the financial information provider Tonghuashun.
The market will be closed for the May Day holiday for the rest of the week.
Under China's market rules, major shareholders must wait for one to two years before they are permitted to sell their shares.
Chinese stocks opened mixed on Monday, with the benchmark Shanghai Composite Index up 0.14 percent to open at 3,090.63 points. The Shenzhen Component Index opened 0.05 percent lower at 9,775.95 points.
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