The Sensex has rebounded into the positive zone, and is now up 12 points at 9993.Dr.Reddy's has surged over 4% to Rs 1,342. Cipla has pared some gains but is still up nearly 3% at Rs 545.Wipro (Rs 505), ONGC (Rs 1,132), HDFC (Rs 1,314), NTPC (Rs 123), Tata Power (Rs 492), Satyam (Rs 748) and Tata Steel (Rs 390) are up over 1% each.HDFC Bank, Hindalco and BHEL have declined 2% each to Rs 727, Rs 151 and Rs 1,827, respectively.Larsen & Toubro (Rs 2,255) and Reliance Energy (Rs 598) have slipped over 1% each.Out of total of 2,366 stocks traded so far, 1,743 have slipped, 580 have moved up and the rest are unchanged.