Sensex rallies over 500 pts in early trade; Nifty tops 15,100

Equity benchmark Sensex rallied over 500 points in the opening session on Thursday tracking gains in index majors HDFC Bank, Reliance Industries and Infosys amid massive buying by foreign institutional investors. A positive trend in global markets also supported the upmove, traders said.Equity benchmark Sensex rallied over 500 points in the opening session on Thursday tracking gains in index majors HDFC Bank, Reliance Industries and Infosys amid massive buying by foreign institutional investors. A positive trend in global markets also supported the upmove, traders said.