Markets closed mostly in the red, continuing prominent selling action seen at the end of last week. Palantir (PLTR) continued its streak as one of the SPX's biggest laggards after trimming another 10% from its stock price. Alibaba (BABA) also sold off despite getting an upgrade from Morgan Stanley. However, Nike (NKE) managed to rally after its upgrade from Jefferies. In Big Tech news, Apple (AAPL) plans to invest $500 billion into A.I. infrastructure for the U.S. Caroline Woods takes investors through the session's biggest movers.