The recent AI advances by Chinese upstart DeepSeek could be the beginning of a potential nightmare scenario that Nvidia Corp. Chief Executive Jensen Huang has been worrying about since the chip maker’s meteoric rise.

Nvidia ( NVDA) CEO Jensen Huang’s net worth plunged $18 billion Monday as the chipmaker’s stock continues to free fall. Huang was worth $106.3 billion as of Monday morning, down nearly 15%, according to Forbes Real-Time Billionaires list. Huang has an approximately 3% stake in Nvidia.