Stock Market Update Monday August 17, 2026 Major U.S. equity indexes closed lower to begin the trading week as escalating tensions between the United States and Iran heightened geopolitical risk and weighed on investor sentiment. The sharp move higher in energy prices reignited inflation concerns and raised the risk that the Federal Reserve could be forced to keep monetary policy restrictive for longer. Higher oil prices could put renewed upward pressure on headline inflation and complicate the Fed’s path toward eventual rate cuts.
Away. From Stocks: Elsewhere across financial markets, the Treasury long bond yield climbed to a post-Lehman Brothers high of 5.31%, while WTI crude advanced toward $85 a barrel. Gold gained nearly 1% to $4,415 an ounce as investors sought safe-haven assets. Bitcoin hovered near $64,000, while the VIX settled just above 15, indicating that despite the geopolitical uncertainty, broader equity-market volatility remained relatively contained.
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