The Shanghai bourse issued a circular to cap the share sell-off rate for large shareholders on Saturday, in an effort to subdue the market's free fall.
The Shanghai Stock Exchange (SSE) forbids major share holders with stakes at 5 percent or above from selling more than 1 percent of a listed company's share capital through the stock exchange's centralist bidding system every three months.
The restriction was announced as stocks plummeted 7 percent half an hour into trade on Thursday, triggering a newly introduced circuit breaker. The mechanism in effect on Jan. 1 was triggered twice in the week.
The China Securities Regulatory Commission (CSRC) has tightened control on short-term big share sales since last year by imposing fines on profiteering trading. It ordered major shareholders must file their plans 15 trading days in advance of sales on Saturday.
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