The Sensex has now slipped into the negative zone and is now down 10 points at 13,039.Idea Cellular listed at Rs 92.40 - a premium of 23% - when compared to its issue price of Rs 75. The stock touched a high of Rs 94, before slipping to a low of Rs 84. The stock is now trading at Rs 88 (up 17%) amid hefty volumes of around 3.20 crore shares on the BSE. Gujarat Ambuja has surged 2.5% to Rs 116. Maruti has rallied nearly 2% to Rs 808.ITC has gained 1.3% to Rs 162, and SBI has added 1% to Rs 1,010.BHEL has slipped over 2% to Rs 2,126. Cipla has shed 1.7% to Rs 232.HLL, Dr.Reddy's and Wipro are down over 1% each to Rs 182, Rs 670 and Rs 571, respectively.The market breadth is positive - out of 1,660 stocks traded so far, 993 have advanced, 634 have declined and the rest are unchanged.