A heavy round of profit-taking saw the Sensex tumble to a low of 9536, down 145 points from its peak. The index is now down 44 points at 9574.Grasim has slumped 2.6% to Rs 1,439.Dr.Reddy's at Rs 1,006, ITC at Rs 143 and Bajaj Auto at Rs 2,030 have declined over 2% each.Wipro, Gujarat Ambuja, Cipla, HLL, Maruti, Larsen & Toubro, ICICI Bank, BHEL and TCS have shed 1% each.Infosys, SBI, Tata Power, Tata Motors and ACC are also on the slippery ground.However, Bharti up 1.2% at Rs 346 continues to hold gains. HDFC, HDFC Bank, Ranbaxy and Hero Honda also continue to trade higher. The market breadth has turned negative. Out of 2,497 stocks traded so far, 1,308 have declined, 1,111 have moved up and the rest are flat.