As DeepSeek rattled markets, the startup on Monday said it was limiting the registration of new users due to “large-scale malicious” cyberattacks on its services.
AI players Meta and Microsoft are among the tech giants scheduled to report earnings this week, offering opportunities for comment on the emergence of the Chinese company.
Shares in another US chipmaker, Broadcom, fell 17.4 per cent while Dutch firm ASML, which makes the machines used to build semiconductors, saw its stock tumble 6.7 per cent.
Constellation Energy, which is planning to build significant energy capacity for AI, sank more than 20 per cent.
Wall Street’s broad-based S&P 500 index shed 1.5 per cent while the Dow advanced 0.7 per cent.
In Europe, the Frankfurt and Paris stock exchanges closed in the red while London finished flat.
Asian stock markets mostly slid.
Just last week following his inauguration, Trump announced a US$500 billion venture to build infrastructure for AI in the United States led by Japanese giant SoftBank and ChatGPT-maker OpenAI.
SoftBank tumbled more than 8 per cent in Tokyo on Monday while Japanese semiconductor firm Advantest was also down more than 8 per cent and Tokyo Electron was off almost 5 per cent.
