Indian stock markets closed marginally lower on Tuesday, December 30, with the Sensex down 20.46 points at 84,675.08 and the Nifty 50 down 3.25 points at 25,938.85. The slight decline occurred amid thin year-end trading volumes, muted global cues, and persistent foreign fund outflows. While some sectors like PSU banks and metals saw gains, IT, FMCG, and realty stocks experienced selling pressure. Market participants cited a lack of fresh domestic triggers and cautious sentiment as key factors influencing the flat performance.