Domestic equity benchmark Sensex soared 646 points on Thursday, boosted by a rally in index heavyweight Reliance Industries. The 30-share BSE index ended 646.40 points or 1.69 per cent higher at 38,840.32. The NSE Nifty rallied 171.25 points or 1.52 per cent to 11,449.25. Reliance Industries was the top gainer in the Sensex pack as it zoomed over 7 per cent. The company’s market valuation rose to Rs 14,66,589.53 crore (USD 199.64 billion) in late afternoon trade.