**U.S. Stock Market Declines Amid AI Concerns**
On Monday, September 15, 2026, major U.S. stock indexes closed lower, with the S&P 500 down 0.48%, the Dow Jones Industrial Average down 0.29%, and the Nasdaq 100 falling 0.82% to a six-week low. This decline was largely driven by weakness in chipmakers and AI infrastructure stocks following calls from AI industry leaders, including Anthropic CEO Amodei and OpenAI’s Sam Altman, to slow the development of advanced AI models.
Crude oil prices surged over 1% to a 3.75-month high, largely due to Saudi Arabia closing a major pipeline that transports 7 million barrels per day (bpd) of crude, raising inflation concerns as global interest rates climbed. The UK Gilt’s 10-year bond yield rose to 5.43%, a 19-year high, while the 10-year T-note yield reached 5.01%, its highest in 2.75 years.
International markets also experienced declines, with the Euro Stoxx 50 down 1.02% and Japan’s Nikkei-225 dropping 0.81%. Market analysts now see a 92% chance of a 25 basis point rate hike from the Federal Reserve during its upcoming meeting.
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