According to rules announced by CSRC, such officials are subject to a one-year lock-up period after the listing of the firm's shares.

The officials will not be permitted to transfer shares in a company within half a year after stepping down, or within a period pre-specified in the exercise agreement, whichever is longer.

They are also restricted to transfers of no more than a quarter of their shareholdings during each year, CSRC said.

Listed companies can also add other conditions, CSRC said.

Parties owning more than 5 percent of a listed company who sell stock within six months, or buy stock six months after a sale, are to surrender gains from such transactions to the company.

The rules also provide two days for the disclosure of share transactions by such officials.

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