Indian markets opened firm on expiry day with Sensex above 82,000 and Nifty near 25,100. Broader indices also gained, led by auto, metals, and energy stocks. Adani Enterprises, NCC, Suzlon, and Sanghvi Movers advanced on fresh order wins. Analysts flagged 24,950-25,150 as the key range, with volatility expected ahead of the US Fed decision.