Hong Kong - Hong Kong's benchmark Hang Seng Index slumped 8.3 per cent Friday to plunge below 13,000 points, closing at 12,618.38, its lowest level in four years.
The index shed 1,142 points and in October lost more than 30 per cent of its value so far.
Turnover was 56.14 billion Hong Kong dollars (7.2 billion dollars).
Analysts blamed concerns about corporate earnings and wider global economic woes for the drop.
Among the biggest losers were HSBC and Standard Chartered, two of the territory's largest banks, dragged down by worries about the banks' investments in emerging economies.
HSBC saw its share price crash 12.5 per cent to end the day at 88 Hong Kong dollars.