The Department of Justice has contacted Nvidia relating to the company’s more than 80% market share of the burgeoning AI chip industry. Reports that the DOJ sent subpoenas to the leading manufacturer of data center graphics processing units,

The chip maker's shares have tended to pop after the Federal Reserve cuts interest rates, judging by data stretching back to 1999.

Worries around a slow payoff from AI investments have mounted, and Nvidia's forecast fell short of expectations despite strong quarterly revenue growth.