The Sensex has bounced back into the positive zone and is now up 40 points at 8636. The Nifty has rallied 19 points to 2602. Ranbaxy, Bajaj Auto, Hero Honda, Maruti, HDFC Bank, ICICI Bank, Tata Motors, Reliance and Reliance Energy are trading with gains of 1-3% each.HDFC is the sole major loser among the Sensex stocks, down over 2% at Rs 1,045. Grasim, Gujarat Ambuja, Infosys and Tata Steel are the only other notable losers.