Shares of Nvidia are down 5%  after the computer chip maker, central to the artificial intelligence race, opened an investigation into reports that CEO Jensen Huang was the “target of a foreign intelligence effort.” Nvidia’s announcement of the investigation Sunday followed Huang’s acknowledgment that he had been intimate with a business executive who, according to The New York Times, U.S. intelligence determined was gathering information for China. China’s Foreign Ministry dismissed the spying allegations, calling them a smear campaign against Beijing.