The BSE benchmark Sensex today lost all its early trade gains and was down by 18 points during noon. The 30-share barometer which rose over 69 points in early trade on sustained buying by funds and retail investors, shed all its inital profit and was trading at 20,013 with 18 points in red.In the Asian region, Japan's Nikkei gained 0.80 per cent, while Hong Kong's Hang Seng rose by 0.16 per cent in early trade today. The US markets remained closed yesterday for a public holiday.