Why Nvidia Stock Just Had Its Worst Day Since 2020

Shares of Nvidia (NVDA) tumbled Monday after the release of a sophisticated artificial intelligence model from a Chinese startup prompted a reckoning on Wall Street regarding AI spending. Chinese company DeepSeek last week released R1, an AI model that appears to rival the capabilities of models from U.S. tech giants like OpenAI and Google despite running on fewer, less powerful chips. U.S. investors began to take notice of the model late last week, and over the weekend started to worry about what it means ...