Indian equity indices ended on a weak note with Nifty at 25,800 on February 12. At close, the Sensex was down 558.72 points or 0.66 percent at 83,674.92, and the Nifty was down 146.65 points or 0.57 percent at 25,807.20. About 1610 shares advanced, 2431 shares declined, and 141 shares unchanged.