Microsoft looks poised to open Thursday with a market valuation above $4 trillion, after reporting strong earnings boosted by AI demand. That would make it the second company to achieve such a milestone,

Microsoft isn't slowing down. The world's second-largest company by market cap reported blockbuster fourth-quarter earnings, sending shares surging so high after hours that the tech giant became a member of the exclusive $4 trillion club.

China’s cyber regulator on Thursday said it had called in Nvidia for a meeting over alleged “serious security issues” with the company’s artificial intelligence chips. It said US AI experts had “revealed that Nvidia’s computing chips have location tracking and can remotely shut down the technology”.

China raised concerns over potential security risks in Nvidia's H20 artificial intelligence chip, casting uncertainty over the U.S. company's sales prospects in China weeks after a U.S. export ban was reversed.

While Nvidia has been given assurances by Washington that it will be allowed to resume exports of its made-for-China H20 general processing units, the AI chips may be met with increased scrutiny from