The S&P 500 fell 1.5% on Monday, Jan. 27, as a Chinese startup's cost-efficient and high-performing AI model sent shockwaves through the U.S. tech sector.

IBM shares jumped 13% to lead S&P 500 gainers Thursday, a day after the company posted fourth-quarter results that topped analysts' estimates as its artificial intelligence (AI)-enabled business surged.

American stocks crashed on Monday as focus shifted to the upcoming Federal Reserve interest rate decision and as concerns about DeepSeek’s success. Futures tied to the Dow Jones index fell by over 1%,

The Nasdaq & S&P 500 fell after Chinese startup DeepSeek shows AI can be built cheaply, sparking fears AI spending will stall. The blue-chip Dow rose.

Stiffer competition for the tech giants at the forefront of the artificial intelligence boom prompted investors to reassess the companies’ sky-high valuations.

Stock futures were near the flatline on Tuesday evening as investors turned toward the first Federal Reserve interest rate decision of 2025. Futures tied to the Dow Jones Industrial Average inched down 11 points, or 0.02%. Nasdaq 100 futures were 0.06% higher, while S&P 500 futures were flat.

Wall Street is coming off a strong session as investors deliberated the implications of President Donald Trump’s return to the White House.

Nvidia shares' 9% recovery Tuesday was the second-best day in terms of market cap added for any company ever—but the company faced another selloff Wednesday.

Chinese startup DeepSeek has debuted an AI app that challenges OpenAI's ChatGPT and other U.S. rivals, sending a shock through Wall Street.

Wall Street closed higher, with the S&P 500 index scoring an all-time high. Blowout Netflix results and plans for $500b AI investment fuel gains.

DeepSeek released an open-source artificial intelligence model in December, saying it took only two months and less than $6 million to create it.

Of the S&P 500 companies that have reported earnings so far, 79% have beat estimates, according to FactSet data.