The Sensex rallied ~862 points on October 17, closing at 83,468, fueled by upbeat corporate results, festival demand, and easing foreign outflows. The Nifty gained 262 points, ending the day above 25,585. Mid- and small-cap names also participated, with optimism around trade talks and domestic macro stability. The rally approached but did not breach all-time highs. Some caution crept in late session as investors booked profits in overextended names. Overall sentiment ended bullish.