The Bombay Stock Exchange benchmark Sensex at midsession on Wednesday surged over 434 points to 15,561.11 -- an almost one-year high -- on aggressive buying by funds on expectations that the government would jack-up spending in the Budget to boost economic growth.
    
The Sensex, which gained significantly for the second straight day, shot up by 434.11 points, or 2.87 per cent, to 15,561.11 at 1300 hrs, matching a level last seen on August 11 last year.
    
The wide-based National Stock Exchange index Nifty shot up by 137 points, or 3.01 per cent, to 4,687.95.
    
The capital goods, metal and banking segments were the major supporters to the rally.