DeepSeek is fueling a sell-off in one of the market's best-performing sectors last year: nuclear energy.

DeepSeek has complicated the dominant narrative that's propped up the market for the last 2 years, challenging lofty valuations and heavy AI spending.

Shares in the nuclear power company tumbled after the success of Chinese startup DeepSeek's AI model led investors to question whether AI will require the huge amounts of computing power and electricity once expected. Monitor these crucial chart levels.

A major tech stock sell-off ensued Monday as the debut of DeepSeek rattled investors. Nvidia, Alphabet, and Microsoft were among the biggest losers.

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DeepSeek topped the Apple App Store chart and sparked fears the Chinese company was quickly catching up with OpenAI's ChatGPT while costing far less.

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Apple is set to report fiscal first-quarter results after the closing bell Thursday, with analysts watching for signs the iPhone maker’s stock can recover after a disappointing start to 2025.

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.S. and China in developing AI technology. Part of what's worrying some U.S. tech industry observers is the idea that the Chinese startup has caught up with the American companies at the forefront of generative AI at a fraction of the cost. "The models they built are fantastic, but they aren't miracles either," said Bernstein analyst Stacy Rasgon, who follows the semiconductor industry and was one of several stock analysts describing Wall Street's reaction as overblown.

Shares of U.S. power, utility and natural gas companies sold off on Monday in some of the biggest recorded one-day drops, as new AI technology from Chinese start-up DeepSeek cast doubt on a projected surge in U.S. electricity demand and tech spending. Power producers were among the biggest winners in the S&P 500 last year on expectations of ballooning demand from the energy-guzzling data centers needed to scale Big Tech's artificial intelligence technologies. The wider adoption of AI models like the one developed by DeepSeek, which it says it built in under two months and is cheaper than models currently used by U.S. companies, could result in less electricity demand overall and result in a smaller power build-out, analysts and economists said.