The domestic stock market indices were down in afternoon trading on December 31, with the S&P BSE SENSEX at 77,993.41, down 0.33%, and the NSE NIFTY50 at 23,591.75, down 0.22%. Unimech Aerospace debuted at ₹1,460, an 86% premium over its IPO price. KIOCL shares rose 13%, while Adani Wilmar fell 7.83% following Adani Group’s exit from its FMCG joint venture. RITES and Surya Roshni saw gains of 10% and 7.6%, respectively. Lupin shares increased after acquiring Huminsulin, while Easy Trip Planners dropped nearly 10% amid stake sales.