To protect investors and make increase the appeal of trading in an equity market that's slumped 58% this year, the Shanghai and Shenzhen stock exchanges will enhance transaction rules on October 1, Bloomberg reports.

Companies no longer have to halt trading of their shares during quarterly earnings announcements, the Shenzhen Stock Exchange said in a newspaper statement today. Instead, stocks with volatile and ``abnormal'' movements due to speculation will be suspended, the exchange said, without elaborating.

A trading moratorium on investors who buy stakes in companies in the 12 months preceding their initial public offers will be slashed to one year from the current three years, the Shanghai Stock Exchange said in a newspaper statement today.

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