Key TakeawaysThe S&P 500 was flat on Wednesday, Nov. 20, as markets braced for afternoon earnings news from AI chip powerhouse Nvidia, the world's highest-capitalized company.Target shares plunged as the retailer missed quarterly estimates, noting cautious consumer spending behavior.AI investments helped electronic testing supplier Keysight top quarterly expectations, increasing its shares. Major U.S. equities indexes were mixed and little changed on Wednesday as Nvidia (NVDA) prepared to disclose quarterly ...