Signals

The US Justice Department sent subpoenas to Nvidia Corp. and other companies as it seeks evidence that the chipmaker violated antitrust laws, an escalation of its investigation into the dominant provider of AI processors.

Nvidia’s yearly AI chip refresh may not start this year.

Tech firms have been spending historic amounts of money on AI—but will it pay off?

Their shares have fallen 11.8% from last month’s peak but more AI breakthroughs may reassure investors