On an average day, no more than 150,000 shares are traded.

More than 11 million shares were traded, 13 times the daily average for the last three months.

They closed at $30, after more than 5.8 million shares were traded.

The stock closed at $25 after almost 3.7 million shares were traded, some of them more than once.

For example, yesterday the market was down over 100 points, but two billion shares were traded.

Last week the shares traded at $10.75, an 18-month low.

Only about 700 companies in China have won permission to trade shares on one of the nation's young stock markets so far.

Studies have suggested that several million shares are traded per day.

However, this may not be the price that would prevail if the share were traded now.

More than 5 million shares were traded as the stock fell $4.25, to $50.25.