Nvidia shares are down after a report that its OpenAI investment stalled. Here's what's happening CNBCPledge to Invest $100 Billion in OpenAI Was ‘Never a Commitment,' Says Nvidia's Huang Yahoo FinanceExclusive | The $100 Billion Megadeal Between OpenAI and Nvidia Is on Ice The Wall Street JournalNvidia and Oracle are sending similar warning signs about the AI trade MarketWatch