The 40-year-old founder of China's DeepSeek, an AI startup that has startled markets with its capacity to compete with industry leaders like OpenAI, kept a low profile as he built up a hedge fund that now manages a reported $8 billion in assets.

U.S. tech stocks, including Nvidia, Oracle and Broadcom, plummeted Monday after Chinese startup DeepSeek said it created an AI system that can compete against chatbots such as OpenAI's ChatGPT at much lower costs.

A frenzy over an artificial intelligence chatbot made by Chinese tech startup DeepSeek was upending stock markets Monday and fueling debates over the economic and geopolitical competition between the U.