U.S. stocks have kicked off 2026 on a strong note, but could face turbulence in the coming days with the start of corporate earnings season, fresh inflation data and rising geopolitical uncertainty. The S&P 500 (.SPX), s up nearly 2% already in January, on the heels of the benchmark index in 2025 closing out its third straight year of double-digit percentage gains. Stocks jumped on Friday after mixed jobs data that saw traders maintain expectations for more interest rate cuts this year. The...