The Bombay Stock Exchange benchmark Sensex on Wednesday closed at 18358, up by 191 points. The 30-share index touched a low of 18,263 and a high of 18,444 intraday. Similarly, National Stock Exchange's Nifty ended at 5511, up by 61 points. The broader index touched a low of 5,475 and high of 5,535 in trade. BSE Midcap Index was up by 1.37 per cent and BSE Smallcap Index moved 1.26 per cent higher.