Nvidia's market value dropped more than $500bn after the emergence of DeepSeek - a low-cost chatbot built by a Chinese AI firm.

U.S. equity declines followed a selloff that started in Asia, with Japan's SoftBank Group finishing down 8.3%, and moved through Europe where ASML fell 7% ...

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