Nuclear energy stocks tumbled; OKLO slumped 13% and SMR plunged 11%.

Chinese artificial intelligence startup DeepSeek rocked global technology stocks Monday, raising questions over America’s technological dominance.

Buzz grew over the weekend about DeepSeek’s latest AI model being cost-effective while running on less-advanced chips, casting doubt on the validity of the sky-high valuations for companies like Nvidia Corp. Nvidia has led the global AI stock boom as its chips have been seen as essential to the technology.

“DeepSeek shows that it is possible to develop powerful AI models that cost less,” said Vey-Sern Ling, managing director at Union Bancaire Privee. “It can potentially derail the investment case for the entire AI supply chain, which is driven by high spending from a small handful of hyperscalers.”