Indian markets ended lower, snapping a three-day rally, with the Sensex falling 504 points and the Nifty closing below 25,700 as benchmark indices declined over 0.5%. Selling pressure in IT stocks and heavyweights weighed on sentiment, while market breadth stayed negative. Trent, Page Industries, Cummins India and IOC gained on Q3-related developments, while losses in Hindustan Zinc, Tube Investments and major IT stocks dragged the market.