The Sensex has rebounded into the positive zone and is now up 20 points at 12,257.ICICI Bank and Tata Steel have rallied 3% each to Rs 675 and Rs 511, respectively. Tata Motors has surged 2.5% to Rs 857.Reliance has gained 1.4% at Rs 1,171. Bharti Airtel and HDFC Bank are up 1% each at Rs 474 and Rs 883, respectively.ITC has shed 1.5% to Rs 185. Bajaj Auto and Grasim have slipped 1.3% each to Rs 2,881 and Rs 2,488, respectively.TCS, Reliance Communications, Larsen & Toubro and ONGC are down 1% each.Out of 2,544 stocks traded so far, 1,400 have declined, 1,076 have advanced and the rest are unchanged.