The Sensex opened with a positive gap of 26 points at 12,488, and soon zoomed to a new all-time intra-day high of 12,545.The index thereafter tumbled into the negative zone to a low of 12,426 - down 119 points from peak. The index is now almost flat at 12,456 - down six points.Hindalco, Bharti Tele and Wipro have slipped over 1% each to Rs 226, Rs 417 and Rs 533, respectively.Bajaj Auto, Tata Motors and ITC are the other prominent losers among the Sensex stocks.On the other hand, ONGC, HDFC Bank and HLL are the notable gainers among the Sensex stocks.