The BSE benchmark Sensex was trading 20 points up at 19,507 points in the late morning trade. It gained 75 points in early trade today. The 30-share barometer had gained nearly 182 points in the previous three session. All the sectoral indices, led by Auto, metal, consumer durable, capital goods, realty, oil and gas and power, were trading in the positive zone.The wide-based National Stock Exchange index Nifty was trading 2 points up at 5,933 points a shortwhile ago.