According to @CNBC, European markets are set for a lower open on December 31, 2025, the final trading day of the year. According to @CNBC, the post did not provide index futures levels, sector drivers, or specific catalysts beyond the headline. According to the London Stock Exchange, the LSE cash session begins at 08:00 GMT on trading days, and according to Euronext, its main European cash markets open at 09:00 CET. According to @CNBC, the post did not mention cryptocurrencies or digital asset markets.