China's DeepSeek startup roiled artificial intelligence-driven stocks on Monday as Wall Street mulled huge investments by technology industry giants in AI infrastructure as well as demand for Nvidia chips.

It feels like this day was always going to come — when all the artificial-intelligence names collapse — but one might have imagined it would come from, say, a profit warning from Nvidia. Instead, it comes from what appears to be an Nvidia consumer, Chinese AI service provider DeepSeek.