The stock market gave a rousing thumbs-up to the Union Budget, as the Sensex at the Bombay Stock Exchange soared a massive 536 points, or 3 percent, to again cross the 18,000 mark, at 18,237, in afternoon deals, a short while ago. Earlier this morning, the Sensex had opened a more modest 114 points higher, at 17,815, on renewed buying by foreign funds and retail investors ahead of the Budget. The Nifty at the National Stock Exchange surged 163 points, or 3.1 percent, to 5,466.