# AI bubble could drag down broader stocks as valuations and investment returns raise concerns

By Riza Dagoc

Canonical URL: https://www.tokenpost.com/news/investing/57628
Published: 2026-11-15T02:20:31.000Z
Updated: 2026-11-15T02:20:31.000Z
Section: Investing

> Frank Giustra warned that stretched AI valuations and uncertain returns on heavy spending could spread a sector correction across the broader stock market.

Stretched valuations and heavy spending on artificial intelligence could leave the broader stock market exposed to an AI bubble unwinding. Even companies generating real revenue must justify the prices investors pay for them.

In a November 14 interview with David Lin, Frank Giustra, CEO of the Fiore Group, described AI valuations and investment spending as a bubble. He warned that the sector’s substantial weight in the S&P could spread the impact of a correction across the market.

Giustra identified uncertain long-term returns on investment as a central concern, saying he could not see evidence that the billions being spent would deliver sufficient returns. “All bubbles end,” he said, adding that they can climb much further than expected before breaking. With so much capital entering the sector, he argued, some companies and their investors would inevitably lose money.

As evidence of stretched market valuations, Giustra pointed to the ratio of US stock market capitalization to gross domestic product. He said it had reached 240% before the recent selloff, compared with 150% at the dot-com peak. In his assessment, those levels underscored how expensive equities had become while the returns on AI spending remained unclear.

Giustra said the presence of revenue distinguished the current market from the dot-com boom, when enthusiasm often centered on businesses without sales. Today’s companies include businesses producing real revenue, he said, but that does not remove the need to justify their valuations.

He also linked sharp reactions to disappointing technology earnings to the scale of the preceding rally, saying investors needed to consider how far shares had risen over the past 12 months. He viewed the declines as the start of an unwinding he had anticipated. Giustra said he had watched institutional selling, retail buying and the growing belief that a single sector was the only place to invest, describing the concentration as unprecedented in his experience.

Giustra distinguished AI’s potential to change the world from the returns investors might earn. As with the internet, he said, enthusiasm for a new technology can become excessive. He expected a small number of surviving companies to perform very well, while predicting that 90% would disappear.