As the United States Department of Justice served Nvidia (NASDAQ: NVDA) with a subpoena as part of its probe into the semiconductor manufacturer’s alleged antitrust practices that make it difficult for buyers to switch to other suppliers, it had an expected impact on NVDA stocks.Indeed, after delivering questionnaires to other technology companies, the DoJ has moved to the next step and started to issue legally binding requests for information that force recipients to respond, according to the people famili ...