Stock Market Today: Global MarketGlobal markets also delivered a mixed picture. What Is Happening in the US Stock Market Today? US Stock Market Today: What Investors Should Watch NextUS July CPI data: Wednesday’s inflation report is the biggest near-term market catalyst. FAQs: US Stock Market TodayWhy is the US stock market down today? Stocks are under pressure mainly because investors are concerned about oil prices, inflation and the Federal Reserve’s interest-rate outlook.