The Hang Seng Index fell 0.9 per cent to 26,050.08 at the noon break, taking the monthly decline to 3 per cent. The Hang Seng Tech Index dropped 1.9 per cent.
On the mainland, the CSI 300 Index slid 1 per cent and the Shanghai Composite Index retreated 0.6 per cent.
Chinese electric-vehicle maker BYD sank 3.7 per cent to HK$100.30 after third-quarter profits fell 32 per cent from a year ago on slowing sales hurt by a price war. Chipmaker Semiconductor Manufacturing International Corp slumped 5.1 per cent to HK$75.15. Alibaba Group Holding retreated 3.2 per cent to HK$166.60 and Tencent Holdings lost 2.3 per cent to HK$636.
With the dust settling on China-US tensions, investors turned back their attention to the fundamentals. The outcome of a sit-down between Chinese President Xi Jinping and his US counterpart Donald Trump on Thursday largely came in line with expectations, with the earlier stock gains having already priced in the detente.
