Nvidia shares slump amid reports US is ramping up antitrust investigation The GuardianNvidia down 2% in premarket trading after plunge that wiped out nearly $300 billion in market cap CNBCNvidia’s Huang Loses $10 Billion in His Biggest Wealth Wipeout BloombergNvidia Gets Subpoena From US DoJ, Bloomberg News Reports U.S. News & World ReportNvidia slapped with subpoena as legal challenges mount Fortune