Nvidia's stock fell in premarket trading Monday after reports emerged that the chipmaker's plans to invest $100 billion into OpenAI were stalled. The semiconductor giant's shares was down 1.8% as of 6:30 a.m. ET. Company insiders said there was uncertainty about a deal between Nvidia and OpenAI, according to a Wall Street Journal on Friday, citing people familiar with the matter. Nvidia announced an agreement with OpenAI in September to build at least 10 gigawatts of computing power for OpenAI,