Equity benchmark Sensex surged over 125 points in early trade on Friday, tracking gains in index majors Tech Mahindra, TCS and HDFC twins. In a very volatile start at the markets, both the indices ' Sensex and Nifty - were oscillating frequently between the green and red. The 30-share index was trading 125.81 points or 0.24 per cent higher at 52,778.88 in initial deals, while the broader NSE Nifty advanced 38.55 points or 0.24 per cent to 15,817.00.

Tech Mahindra was the top gainer in the Sensex pack, rising over 8 per cent, followed by HCL Tech, Power Grid, HDFC, Dr Reddy and M&M. Tech Mahindra on Thursday reported a 42.91 per cent growth in June quarter consolidated net profit at Rs 1,365.7 crore on higher revenue and an expansion in profit margins. Besides, TCS and HDFC Bank gained up to 0.45 per cent in early deals.