Big Short Investor Eisman Sees AI Boom's Fatal Flaw: Two Startups

Steve Eisman, the investor known for correctly predicting the 2008 subprime mortgage crisis and profiting from it (the subject of the film "The Big Short"), has publicly cautioned against a fundamental weakness in the current AI investment thesis. Speaking on CNBC's Fast Money, Eisman made the case that the boom in artificial intelligence is underpinned by an unhealthy concentration of revenue and risk.

Eisman estimates that OpenAI and Anthropic together account for roughly 70% of AI-related revenue flowing to four of the largest US technology companies: Microsoft, Amazon, Alphabet's Google, and Oracle. The same two startups represent 25% to 35% of cloud revenue at those companies. This dependency means that "the futures of these massive companies, in a sense, are a bet that OpenAI, Anthropic are going to succeed," Eisman explained. The concern is acute because it creates a single point of failure: if either startup stumbles, or if the assumptions underpinning their valuations prove wrong, the entire AI revenue narrative for these four giants could unravel.

The more immediate threat, in Eisman's view, comes from Chinese competition. He highlighted that Chinese open-source AI models are far cheaper than their US counterparts and are beginning to win customers. If this trend accelerates, Eisman warned, it could trigger a sector-wide price war. "If they start really taking a lot of market share ... you could have a big price war. And then we have a problem," he stated. Such a scenario would compress margins across the entire AI supply chain, from cloud providers to AI model developers.

In response to these concerns, Eisman has taken concrete action. Last month, he sold his stake in Google and shifted his portfolio to cash, explicitly seeking to reduce his exposure to AI. His move reflects a defensive posture: rather than betting on AI success, he is stepping to the sidelines.

Eisman is not the only prominent investor expressing caution. Michael Burry, who famously shorted subprime mortgages before the 2008 financial crisis, has also positioned himself against the AI trade. Burry is currently short on the iShares Semiconductor ETF (SOXX), Micron, Nvidia, Caterpillar, Palantir, Tesla, and Applied Materials. Additionally, he has forecasted that US stocks could experience a crash reminiscent of 1987. These positions signal deep skepticism about the sustainability of both semiconductor demand and the broader equity market in the face of AI-related valuations. Not all observers agree with this bearish outlook; BitMine Chairman Tom Lee interprets AI capital expenditure fears as a bullish signal, and Mad Money host Jim Cramer has stated that the AI data center trade is regaining market leadership.