The Sensex at the Bombay Stock Exchange was trading 15 points in the negative zone at 19,486 in afternoon deals. The 30-share barometer had opened 17 points in the red today, as funds and retail investors booked profit, amid weakness in other Asian bourses.The Nifty at the National Stock Exchange index was trading 5 points in the red at 5,893.In the Asian region, Japan's Nikkei Index was down 0.11 per cent, while Hong Kong's Hang Seng index shed 0.15 per cent in early trade today.The Forex and money markets are closed today. The markets are closed on account of 'Chhatrapati Shivaji Maharaj Jayanti'.