S&P 500 Gains and Losses Today: UnitedHealth Stock Ails as Results Fall Short

Market Overview - Major U.S. equities indexes experienced a decline, with the S&P 500 slipping 0.2%, the Dow down 0.2%, and the Nasdaq Composite falling 0.9% after a strong rally driven by soft inflation data and positive earnings [2][9] Company Performance - UnitedHealth Group (UNH) shares fell 6.0% due to lower-than-expected revenue despite quarterly profits exceeding expectations, alongside an increase in medical costs impacting the medical cost ratio [3][9] - US Bancorp (USB) shares dropped 5.6% after reporting mixed quarterly results, surpassing adjusted profit estimates but missing forecasts for net interest margin [4] - Texas Instruments (TXN) shares decreased by 5.1% following news of an investigation by China's Commerce Ministry into U.S. subsidies for chipmakers, which could affect the company's operations in China [5] Positive Developments - Dexcom (DXCM) shares rose 5.5% as analysts highlighted positive catalysts, including a stable outlook for its durable medical equipment channel and reimbursement approval for 5 million type 2 diabetes patients not using insulin [6][9] - Estee Lauder (EL) shares increased by 4.8% after JPMorgan raised its price target, with analysts anticipating significant impacts on the household and personal-care products sector during the earnings season [7] - Semiconductor equipment stocks saw gains following strong fourth-quarter profit guidance from Taiwan Semiconductor Manufacturing Co. (TSM), with shares of Applied Materials (AMAT), KLA Corp. (KLAC), and Lam Research (LRCX) rising by 4.5%, 4.3%, and 4.0% respectively [8]