The Sensex at the Bombay Stock Exchange was trading 116 points in the negative territory at 18,677 in late morning deals, when reports last came in. The 30-share barometre fell by 127 points in opening trade today on emergence of profit selling by funds and retail investors amid a weakening trend on Asian bourses.The Nifty at the National Stock Exchange Nifty was trading 38 points in the red at 5,666.In the Asian region, Japan's Nikkei was down 1.69 per cent, while Hong Kong's Hang Seng index shed 0.49 per cent. The US Dow Jones Industrial Average ended 0.81 per cent lower in overnight trade.