US stock market today: Why is the Dow Jones crashing today while the Nasdaq and S&P 500 keep hitting record highs? AI stocks surge, oil crashes, and Wall Street split…

The Dow Jones Industrial Average slipped 0.23% to 49,794.83 on Thursday, contrasting with the Nasdaq Composite and S&P 500, which reached fresh all-time highs. The divergence stems from the Dow’s composition: it tracks just 30 companies, heavily weighted toward 'old economy' sectors like energy, healthcare, and financials, which are underperforming. Chevron fell 2.89%, Merck dropped 1.78%, and JPMorgan Chase lost 1.62%, pulling the index lower despite gains elsewhere. The energy sector led the Dow’s decline, with West Texas Intermediate crude falling 3.8% to $91.50, following a 7% drop the prior day. Analysts attribute the slide to speculation that a U.S.-Iran diplomatic deal could increase global oil supply by lifting sanctions on Iranian crude. The DJ Oil & Gas sector index dropped 3.05%, the worst-performing sector of the day, directly impacting the Dow due to its price-weighted methodology. Meanwhile, the Nasdaq and S&P 500 surged, driven by tech stocks. Nvidia rose 2.52%, Microsoft climbed 2.19%, and Salesforce gained 2.62%, reflecting strong demand for AI-related companies. The Nasdaq Composite advanced 0.58%, while the S&P 500 rose 0.12%, as these indices include thousands of firms, many of which benefit from tech and innovation trends absent in the Dow’s narrower portfolio. The Dow’s underperformance highlights its structural limitations. Its price-weighted system amplifies moves in high-priced stocks like Chevron, even if their market influence is smaller than in broader indices. Financials (-0.59%) and healthcare (-0.74%) also weighed on the Dow, while utilities (-0.81%) lagged, underscoring the index’s exposure to cyclical sectors. Analysts note the split reflects broader economic shifts, with 'old economy' industries struggling against a backdrop of AI-driven growth in tech. The Dow’s decline does not signal a market-wide downturn but instead underscores its unique composition compared to the Nasdaq and S&P 500, which better capture the diversified U.S. economy.