By | May 25 2012 4:12 AM

India's Bombay Stock Exchange Sensex started on a negative note Friday and was trading in the red in the morning session. However, the 30 share BSE benchmark index and the NSE Nifty extended gains at 1230 IST, but the trading remained choppy and ended flat at 16,230 (provisional), up 8 points from its previous close, and Nifty closed at 4,926 (provisional), up 4 points.