Concerns grow over mounting margin calls as China's stock market slides

SHANGHAI: China's stock market slump in January led to a wave of calls for investors to top up cash in their margin trading accounts, triggering fears that a further slide in share prices could spur forced selling of tens of billions of dollars worth of stocks.

The country's blue-chip CSI300 Index tumbled 6.3% last month, plumbing five-year lows, as a raft of government support measures failed to revive confidence dented by an ailing economy.