Update | Shanghai and Shenzhen stock market indices close up after rollercoaster session

Mainland markets rose then fell then rose again as investors returning from a public holiday fended off margin calls while buying on the dips.
At the end of a rollercoaster session, the Shanghai Composite Index closed up 2.16 per cent at 4,575.12 after falling by close to 5 per cent at one point; the kind of stomach-churning intraday swing investors may need to get used to following sharp falls last week.
Brokers called in margin loans on Tuesday morning after the markets dropped more than 13 per cent last week, said Louis Tse of VC Brokerage.
“When the selling finished there was a rebound,” Tse said.
A gauge of 30-day volatility on the Shanghai Composite rose to its highest since September 2009 on Friday.
Defence, financial and home appliance stocks led the rebound with investors betting shares will rise again on Wednesday as liquidity is released back into the markets following a recent wave of new listings.