CSI300 Index tumbled 6.3% last month, plumbing five-year lows.
The value of shares that face the risk of forced liquidation as a result totals 183.6 billion yuan ($26 billion), up 26% from end-November.
A further 10% slide from the current market levels could trigger margin calls worth nearly 100 billion yuan, Guotai Junan Securities estimates.
Another 20% decline could potentially lead to forced selling worth roughly 360 billion yuan.
In a sign investors are rapidly unwinding leveraged bets, outstanding margin loans shrank by nearly 100 billion yuan in January to a one-year low of 1.55 trillion yuan, 30% below a 2015 peak.
Margin loans are currently equivalent to 2.3% of China's total stock market capitalisation.
Source: Reuters
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