The Sensex has rebounded into the positive zone and is now up 13 points at 10,289.Ranbaxy has surged 3.7% to Rs 384. Wipro, HDFC Bank and Satyam have gained nearly 2% each at Rs 457, Rs 744 and Rs 697, respectively.Reliance and Tata Steel are up 1.5% each at Rs 988 and Rs 496, respectively.HDFC has shed 2.8% to Rs 1,090. Larsen & Toubro is down 2.6% at Rs 2,139, and Hero Honda has slipped 2% to Rs 755.