Markets Close Mixed in September as S&P 500 Falls and Nasdaq Gains on AI Strength
September 2026 ended with mixed results across major U.S. stock indexes. The S&P 500 fell about 0.5 percent and the Dow Jones dropped 4.3 percent, while the Nasdaq gained 1.9 percent on continued strength in AI and technology stocks.
NEW YORK — U.S. stock markets closed September 2026 with mixed results, as rising interest rates and inflation pressured most sectors while technology stocks held firm on continued demand for artificial intelligence.
The S&P 500 declined approximately 0.5 percent for the month. The Dow Jones Industrial Average fell 4.3 percent, weighed down by interest-rate-sensitive sectors including utilities and real estate. The Nasdaq Composite gained 1.9 percent, driven by strength in AI and semiconductor stocks.
The Federal Reserve's September 16 rate hike to a range of 3.75 to 4 percent set the tone for the month. The 10-year Treasury yield climbed above 5.3 percent, its highest level in years, putting pressure on stocks that compete with bonds for investor dollars.
The Personal Consumption Expenditures index, the Fed's preferred inflation measure, ran at approximately 3.4 percent for the month. That figure remains well above the Fed's 2 percent target and has kept expectations for rate cuts pushed into 2027 or later.
Technology stocks bucked the broader trend. Companies tied to AI infrastructure, including chip makers and cloud providers, continued to attract investor interest as demand for AI computing power shows no signs of slowing.
Wealth managers are advising clients to prepare for continued volatility. Firms are recommending that investors review their portfolios for interest-rate sensitivity and consider tax-loss harvesting opportunities before year-end.
The fourth quarter historically brings increased market activity as investors position for year-end. With the next Federal Reserve meeting scheduled for late October, markets are watching closely for signals on whether additional rate hikes are coming.
