Key TakeawaysU.S. equities headed into the long holiday weekend with gains at midday Friday, Dec. 22, 2023.Bristol Myers Squibb said it would $14 billion for Karuna Therapeutics to expand its neuroscience portfolio and shares of Karuna Therapeutics jumped.Nike shares plummeted after the athletic apparel retailer cut its guidance and planned to reduce spending, citing softness in demand.U.S. equities headed into the long holiday weekend with gains at midday, amid a broad-based rally fueled by enthusiasm over ...