Mumbai: Ignoring global turnaround, Indian bourses witnessed volatility with investors continuing sell- off on expiry day of August series as the benchmark S&P CNX Nifty lost another 49.30 points at the National Stock Exchange on Thursday. The 50-share index traded between a high of 4,915.85 and a low of 4,825.05 before ending at 4,839.60, a net loss of 49.30 points, or 1.01 per cent over its last close. The market, which opened on a high note following a rally in global markets, succumbed to profit-selling and continued to trade with choppiness. The key index witnessed a smart recovery from its day's low but positive European markets failed to sustain the momentum again due to profit-selling with heavy unwinding mainly in IT and Banking counters and ended in red on the last day of the August series. "Fears of rate hike continue to haunt the market sentiment on the back of inflationary worries and above all global uncertainty mainly prompted investors to take profit," traders said. JP Associates, SAIL, HCL Tech, Jindal Steel, Infosys, Hndalco, Hero Motors, Tata Steel, PowerGrid and HDFC bank were the top losers from the Nifty. DLF, PNB, Ambuja Cement, Rcom, Tata Motors, ONGC, Bharti Airtel, SunPharma, Grasim and Maruti registered gains. Turnover in cash segment shot up to 13,387.74 crore from 9,631.87 crore yesterday. A total of 7,393.42 lakh shares changed hands in 58,93,975 trades. The market capitalization stood at 58,03,583 crore.