The U.S. stock market faced volatility during the week of Sept. 14–18, 2026, after the Federal Reserve raised its policy interest rate by 0.25% to 3.75–4.00% on Sept. 16, citing persistent inflation above the 2% target. Fed Chair Powell signaled additional rate hikes were possible this year, prompting sharp selling in large-cap technology stocks and pushing the 10-year Treasury yield toward 5%, which weighed on equities. The week ended with mixed results across major indices after "Quadruple Witching" expiration day on Sept. 18 drove heightened trading activity.
Investors will closely monitor earnings announcements this week, particularly Costco Wholesale's results on Sept. 24, to assess whether consumer spending remains resilient amid sustained high interest rates. Key economic data including the S&P Global PMI on Sept. 23 and initial jobless claims will provide signals about the economy's ability to withstand monetary tightening.
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