Turbulence in some of the biggest tech names is reminding investors of one of the major risks to the U.S. stock market's record-setting rally: Reliance on a handful of mammoth companies to power those gains. Investors are scrambling to understand the fallout for the artificial intelligence (AI) investment theme that has been a critical driver for stocks over the past two years after the emergence of a low-cost Chinese AI model rattled markets. Optimism over AI has helped propel shares of chipmaker Nvidia and others of the "Magnificent Seven" megacaps, which combined contributed more than half of the S&P 500's 25% total return in 2024.

TOKYO (Reuters) -The dollar firmed against the yen and euro on Tuesday on new U.S. tariff threats, giving traders little time to catch their breath after Monday's big risk-off moves on concerns that U.S. dominance in artificial intelligence technology may be wavering. Any market relief that President Donald Trump stopped short of hiking tariffs on U.S. trading partners immediately after taking office last week has quickly faded. Trump said he planned to impose tariffs on imported computer chips, pharmaceuticals and steel in an effort to get the producers to make them in the United States.

The IPO valued the pork producer at $7.95 billion, ahead of a market debut that will see the company return to a U.S. exchange after more than a decade. The offering was priced at $20 per share, Smithfield said, below the $23-$27 per share range that would have raised as much as $939.6 million. Smithfield raised $260.9 million in the offering, while the rest was raised by the selling stockholder, a unit of its parent company WH Group.

A $1 trillion wipeout in the US stock market has given Liang Wenfeng a new burst of online stardom, with one Chinese paper calling him a "great god."

A tech sell-off on Monday saw more than $1 trillion in value erased over concerns over China's DeepSeek AI app.

The share price may be crumbling but we believe the investment case for landscaping, building and roofing products supplier Marshalls remains solid, so we shall keep faith in the recovery potential at the West Yorkshire company.

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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.