Earnings live: UnitedHealth stock falls 19%, American Airlines slides, Texas Instruments pops, Logitech edges higher

The fourth quarter earnings season kicks into high gear this week, with Big Tech results from Microsoft (MSFT), Meta (META), Tesla (TSLA), and Apple (AAPL) headlining the earnings calendar. An optimistic consensus is forming: As of Jan. 23, 13% of S&P 500 (^GSPC) companies have reported fourth quarter results, according to FactSet data, and Wall Street analysts estimate an 8.2% increase in earnings per share for the fourth quarter. If that rate holds, it would represent the 10th consecutive quarter of ann ...