Nvidia shares plunged by more than 8% in after-hours trading following reports that the chipmaker's board is preparing to oust longtime CEO Jensen Huang amid unfolding affair allegations.

Nvidia Board Weighs Future of Co-Founder Jensen Huang

The leadership crisis at one of America's most valuable companies intensified as reports from outlets including the Wall Street Journal indicated the board is taking steps to remove Huang. The turmoil follows an ongoing investigation into Huang's relationship with an executive who reports to him, as well as a separate reported relationship with a Chinese businesswoman.