Billionaire entrepreneur Mark Cuban and “The Big Short” investor Michael Burry recently sounded the alarm about the AI boom in the U.S. stock market, pointing out that it may be built on shaky ground.Cubane compared NVIDIA (Nvidia)’s central role in the AI boom to IPOs during the dot-com bubble, arguing that the entire boom could collapse if other chip suppliers make breakthroughs or if NVIDIA itself makes a misstep. Burry, meanwhile, pointed to the soaring cost of five-year credit default swaps (CDS) for NVIDIA, suggesting “over-expansion” and “cyclical spending”.

Furthermore, legendary investor Jeremy Grantham echoed these concerns, calling the current market “the largest investment bubble in U.S. history” and predicting that AI stocks will plummet, with the entire U.S. stock market potentially facing a decline of up to 70 percent.These warnings come as NVIDIA has become one of the world’s most influential companies and AI-related stocks play an increasingly important role in the performance of major market indices, meaning the potential impact could extend far beyond investors who directly hold NVIDIA shares—including trillions of dollars in U.S. retirement savings that could also be indirectly affected.