Nvidia shares tumble 13% after CEO Huang resigns

Shares of Nvidia sank 13 percent in opening trading Thursday after Chief Executive Jensen Huang resigned from the chipmaker following revelations he had an affair with a woman accused of spying for China. With the latest declines Nvidia has lost about $800 billion this week since the revelations shook the company, whose chips have been at the forefront of an expected multi-trillion dollar buildout of artificial intelligence infrastructure.