Wall Street Retreats from Intraday Highs Amid Tariff Uncertainty and AI Optimism

US equity markets experienced a volatile session on Monday, with major indices surrendering significant early gains to close with mixed results. While the Nasdaq Composite and S&P 500 managed to hold onto modest gains, the Dow Jones Industrial Average ended the day slightly lower. The day's price action was characterized by a tug-of-war between bullish AI-driven momentum and uncertainty surrounding future US trade policy. Early optimism was sparked by reports suggesting President-elect Donald Trump might narrow the scope of proposed universal tariffs to cover only critical imports, though the rally stalled after the President-elect dismissed those reports as fake news. In terms of specific movers, the semiconductor space saw substantial activity. Micron (MU) skyrocketed 10.5% and Nvidia (NVDA) gained 3.4%, bolstered by record fourth-quarter revenue reported by Foxconn, a key assembly partner seeing strong AI server demand. The Nasdaq climbed 1.2% to 19,864.90, and the S&P 500 rose 0.6% to 5,975.38, while the Dow dipped 0.1% to 42,706.56. Beyond technology, the airline sector showed resilience, with the NYSE Arca Airline Index spiking 3.7%. This was supported by a rating upgrade for American Airlines (AAL) from Hold to Buy by TD Cowen. Conversely, interest-rate sensitive sectors, including utilities and commercial real estate, faced notable weakness. Global markets presented a fragmented picture, with European indices like the CAC 40 and DAX trending higher, while Japan's Nikkei 225 slumped 1.5%. In the fixed-income market, the benchmark 10-year Treasury yield rose 2.2 basis points to 4.618%. Investors are now looking ahead to upcoming data releases regarding the U.S. trade deficit, service sector activity, and job openings to determine the short-term trajectory of the markets.