Investors Are Rethinking AI’s Trillion-Dollar Spending Spree Stocks opened the week at record highs, but momentum has faltered. The S&P 500 (SPX -0.50%) has now dropped three straight sessions, down 1.3% overall. Some of the weakness can be traced to stronger economic data that pushed bond yields higher, along with Fed Chair Jerome Powell’s cautious stance on rate cuts and his warning about lofty equity valuations. But there’s also a bigger question hanging over the bull market: whether Wall Street’s AI boom has gone too far. That mood shift may have started Monday, when Nvidia’s Jensen Huang and OpenAI’s Sam Altman unveiled plans for a $100 billion investment during a CNBC interview. By Thursday, hedge-fund billionaire David Einhorn gave voice to growing unease. Speaking at the New York Stock Exchange, the Greenlight Capital founder warned that the enormous sums earmarked for AI infrastructure—hundreds of billions annually—risk destroying vast amounts of capital, even if the technology itself proves transformative. “The numbers being thrown around are so extreme that it’s really hard to understand them,” Einhorn said, according to Bloomberg. “There’s a reasonable chance that a tremendous amount of capital destruction is going to come through this cycle.” His skepticism mirrors his long-running complaints about market inefficiency, from frenzied crypto bets—he once called it the “fartcoin stage” of the cycle—to today’s AI arms race. Einhorn also flagged faltering U.S. job growth and shrinking workweeks as signs the economy may already be in recession. And the shift in AI sentiment is spreading. On Friday, CNBC’s Jim Cramer wrote on X that while he once saw endless praise for the data center buildout, he now sees only warnings of bubbles, waste, and an impending crash.

Oklo Becomes the Largest Pre-Revenue Company in the U.S. With a $20 Billion Valuation Oklo Inc. has surged to a $20 billion valuation, earning the title of the largest pre-revenue company listed on a U.S. exchange. Its rise highlights just how far investors are willing to stretch in search of the next big AI play. Shares of Oklo (OKLO) trade around $131, up more than 500% in 2025 and nearly 1,500% over the past year. All of this despite the company never generating a dollar in sales. The attraction isn’t about numbers — it’s about narrative. Oklo is developing small modular reactors (SMRs) designed to supply the immense power demands of AI data centers. The story is boosted by Sam Altman, OpenAI’s CEO, who took Oklo public via his SPAC AltC Acquisition in 2024. Altman served as chairman until April and still owns 5.5% of the company. Retail investors have embraced the stock. On StockTwits, message volume has been flagged as “extremely high,” with overall sentiment marked “bullish.” “It’s a speculative, growth-driven environment, fueled by lower interest rates, strong market and increased retail participation,” said Chris Tessin of Acuitas Investments. Earlier this week, Oklo broke ground on its first commercial SMR at Idaho National Laboratory under the Department of Energy’s Reactor Pilot Program. Still, analysts don’t expect revenue until late 2027. Much like biotech firms awaiting FDA approval, Oklo faces a binary outcome: either successful commercialization or failure that renders its technology worthless. Other SMR competitors are slightly ahead. NuScale Power (SMR) has posted limited revenue since 2022, though mostly from engineering and licensing services, not actual nuclear energy sales. Wall Street’s view of Oklo remains divided. Bank of America initiated coverage with a buy rating and a $92 target, calling it the best-positioned company in the SMR market. Wedbush’s Dan Ives is more bullish, lifting his target to $150. UBS took a cautious stance with a $65 hold rating, warning that steady growth may not come until 2034. Seaport’s Jeff Campbell downgraded Oklo to neutral this week, arguing the valuation is too stretched. For now, Oklo epitomizes the “story stock” — its valuation fueled by AI hype, nuclear optimism, and investor enthusiasm. The real test will be whether investors have the patience to wait nearly a decade for the company to turn promise into profit.