Citigroup has set a 7,700 year-end 2026 forecast for the S&P 500, citing strong corporate earnings and ongoing support from artificial intelligence investment.It argued that the next phase of the AI trade will favor companies that adopt the technology rather than those that simply enable it.The firm said AI infrastructure build-out will remain a central theme in 2026, but investors will increasingly differentiate between winners and losers as fundamentals come under pressure from high starting valuations, R ...