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(Reuters) -The U.S. Department of Justice has sent a subpoena to Nvidia as it deepens its probe into the AI heavyweight's antitrust practices, Bloomberg News reported on Tuesday, citing people familiar with the investigation.
The antitrust watchdog had previously delivered questionnaires, and has now sent legally binding requests to Nvidia, the report said, adding that other companies had also received subpoenas.
Officials are concerned that the chipmaker is making it harder to switch to other suppliers and penalizes buyers that do not exclusively use its artificial intelligence chips, the report said.
"Nvidia wins on merit, as reflected in our benchmark results and value to customers, who can choose whatever solution is best for them," a spokesperson for the company said.
Last month, the Information reported the Department of Justice had launched an investigation into the company after complaints from competitors that it had abused its market dominance.
The subpoena comes at a delicate time for AI-related companies as investors recalibrate expectations around the technology amid worries about slow payoffs from hefty investments in it.
The company said last week it has received requests for information from regulators in the U.S. and South Korea, regarding its investments, partnerships and agreements with other companies. It has also received inquiries from the EU, UK and China.
Nvidia's quarterly forecast, which fell short of investors' expectations last week, has also softened the optimism around AI.
The company's shares fell 1.5% in extended trading on Tuesday after losing 9.5% in the regular session, slashing Nvidia's market capitalization by $279 billion, a record one-day loss for any company.
The shares, however, are still up 141% so far this year, thanks to a dizzying rally sparked by AI expectations.
The DoJ declined to comment when contacted by Reuters.
(Reporting by Niket Nishant in Bengaluru; Additional reporting by Jody Godoy and Max Cherney; Editing by Tasim Zahid and Shinjini Ganguli)
