The Bombay Stock Exchange benchmark Sensex rose by over 125 points in opening trade today on buying by funds after firm global cues. The Sensex was trading at 17649, up by over 121 points when reports last came in. The wide-based National Stock Exchange index Nifty moved up by 35 points to 5,284.The Hong Kong's Hang Seng index was up 0.92 per cent, while Japan's Nikkei gained 0.71 per cent in the morning trade today.