Stock Market News for Sep 15, 2026

U.S. stock markets declined on Monday with all three major benchmarks ending in the red. The Dow fell 0.3%, Nasdaq dropped 0.6%, and S&P 500 lost 0.5%. AI stocks globally tumbled after leaders from Anthropic, OpenAI, and xAI warned about risks from rapid AI development. Treasury yields climbed sharply with the 10-year yield briefly breaching 5%, adding pressure to equities. Oil prices rose about 1% amid Middle East tensions threatening global supply.