The 30-share BSE index after commencing higher, surged further to breach the 25,000 mark once more. It hit the day's high of 25,044.06, before settling 213.68 points, or 0.86 per cent higher, at all-time closing high of 25,019.51.
The rally was powered by shares of metal, oil and gas, power, PSUs, FMCG and IT.
The gauge has now surpassed its previous closing high of 24,858.59 on Tuesday. Its intra-day all-time high remains 25,375.63 hit on May 16.
There is growing speculation that the European Central Bank (ECB) will ease monetary policy later today to support a fragile recovery, said traders.
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Metal and oil&gas prices usually go up after an economic stimulus on hopes some funds will come into such assets.
Sentiment was also bullish following foreign funds inflow on continued optimism about a revival in Indian economy, they added. Metal stocks - Sesa Sterlite and Tata Steel - led the surge helping Sensex end above 25,000-mark for the first time.
"We may see Sensex levels at 30,000 before budget," said Motilal Oswal, CMD, Motilal Oswal Financial Services.
Foreign Institutional Investors (FIIs) bought shares worth a net Rs 192.56 crore in yesterday's trade as per provisional data from the stock exchanges.
Among sectoral indices, the BSE Metal index gained the most by surging 3.33 per cent as Sesa Sterlite, SAIL, Hindalco and Tata Steel gained in 3-7 per cent range.
The BSE Oil and Gas index emerged second best performer by rising 1.96 per cent, followed by Power (1.96 per cent) and FMCG (1.49 per cent). However, the BSE Banking index ended 0.39 per cent lower due to profit-taking.