US Stock Market Key News Summary September 15, 2026

Today’s Market Preview:

China's August industrial production (above designated size) and retail sales. UK unemployment rate for July. Eurozone trade balance. Eurozone ZEW economic sentiment index.

Has a warning bell sounded for US stocks? The 10-year US Treasury yield surged past 5%, hitting a nearly three-year high.

On Monday, September 14, 2026, the yield on the US 10-year Treasury note rose above 5%, marking its highest level since October 2023. Investors are bracing for the Federal Reserve's (Fed) upcoming interest rate decision this week. This benchmark yield, which influences mortgage, auto loan, and credit card rates, climbed over two basis points to reach 5%. If it surpasses 5.02%, it will hit its highest level since July 2007—just before the global financial crisis erupted.

AI giants collectively call for 'slowing down': Chip stocks led by Nvidia and Micron plunge, while cybersecurity ETF records largest gain in history.

Multiple foreign media outlets reported that three major tech giants—Anthropic, OpenAI, and xAI—have jointly urged a slowdown in artificial intelligence (AI) model development. This triggered market concerns over cooling demand for AI hardware and data center capital expenditures, causing chip stocks, AI cloud computing, and related infrastructure shares to plummet violently on Monday, September 14. However, Wall Street analysts believe there are currently no clear signs that AI spending is about to slow down, and these initiatives do not equate to halting model training. They suggest the market reaction may have been overly intense.

Trump makes surprise call to Jensen Huang, jointly dismantling the 'AI doomsday theory'.

US President Trump unexpectedly called Jensen Huang, CEO of Nvidia, who was being interviewed at the All-In Summit in Los Angeles on Monday, September 14. Huang turned on the speakerphone, allowing the audience to hear their conversation. In response to the recent intensifying debate over AI safety, both rejected the 'doomsday theory' that AI would take over or destroy humanity. However, Huang adopted a more cautious stance, emphasizing that the industry should still seriously consider safety warnings raised by whistleblowers.

Executives from Anthropic and OpenAI urge slower AI development; AI-related stocks tumble, while cybersecurity stocks explode.

Stocks related to the artificial intelligence (AI) boom suffered heavy sell-offs on Monday, September 14, as markets worried that a slowdown in AI model development could hinder massive AI infrastructure investments and corporate profit outlooks. At the same time, cybersecurity stocks surged dramatically, as investors bet that the rapid advancement of AI capabilities will instead create even greater demand for cybersecurity protection.