The 30-share index commenced the day's trade on a firm note at 18,753,48 and rose further by 323.83 points, or 1.75 per cent, to close at 18,875.95. This is its highest closing level since 18,774.24 on June 21.
Similarly, the wide-based National Stock Exchange index Nifty gained 93.65 points, or 1.68 per cent, to close at 5,682.35. Also, SX40 index, the flagship index of MCX-SX, closed 170.48 points, or 1.54 per cent higher at 11,219.19.
This also led to the rupee bouncing back from its record lows of 60.72 against the dollar to 60.24 intra-day.
Buying activity further gathered momentum as investors indulged in covering up their pending short positions on current month settlemtn in the derivatives segment, and a firming global trend, they added.
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A firming trend in the Asian region and higher opening in Europe as slower-than-estimated US economic growth stoked speculation the Federal Reserve may hold back from reducing stimulus, further supported the uptrend.
Reliance Industries surged by 3.48 per cent to Rs 830.45 and Infosys by 3.31 per cent to Rs 2,476.95. These two carry the most weightage in Sensex.
Sectorally, the oil and gas sector index gained the most by 3.22 per cent to 8,610.65, followed by IT index rising 3.15 per cent to 6,208.70.