Hundreds of billions of dollars have been wiped off the value of Nvidia after the US chipmaker announced an independent investigation would be carried out into its chief executive's affair with an alleged Chinese spy.
The tech firm saw its shares fall by about 6% on Monday after Jensen Huang admitted having an extramarital affair.
Nvidia's probe came after reports that the US believed the Nvidia boss had been targeted in an espionage campaign by China.
However, China has rejected the claims, with its foreign ministry saying "allegations about Chinese spies were "entirely groundless, speculative and intended to smear and malign China".
Nvidia said it had no reason to believe the company's secrets or national security were compromised, but a statement by Nvidia's board of directors said it would begin an investigation in "light of recent reporting that founder and chief executive Jensen Huang has been the target of a foreign intelligence effort".