Key Takeaways
- • Citadel CEO Ken Griffin said investors are "almost certainly" in the middle of an AI bubble, speaking to Bloomberg at the Future of Global Markets Conference in New York.
- • Griffin argued that radical economic transformation is generally intertwined with bubbles, and that companies surviving such bubbles often become market leaders for decades.
- • Griffin dismissed the explanation that a recent chip stock sell-off was driven by hedge fund deleveraging, calling it an answer that "washes your hands of accountability."
- • Amazon, Microsoft, Alphabet, Meta and Oracle issued nearly $200 billion of investment-grade debt in the first half of 2026, almost twice their 2025 full-year issuance, according to iShares.
- • Ray Dalio and Paul Krugman have raised parallel concerns: Dalio cites heavy AI-related debt issuance as the key bubble risk, while Krugman says AI spending is already crowding out other investment.
Summary
Citadel CEO Ken Griffin said investors are "almost certainly" in the middle of an AI bubble, according to an interview with Bloomberg on Tuesday at the Future of Global Markets Conference in New York. Griffin said that "any radical transformation of our economy is generally intertwined with a bubble," and he drew comparisons to the internet valuation excesses of 1999-2000, describing some of those business models as "fanciful." He noted that companies that survive bubbles often become "market leaders for decades to come," and said, "I just wish I'd kept my Amazon stock in that moment," referring to the internet as a "great bubble."
On the recent chip stock sell-off, Griffin said the common explanation that hedge fund "deleveraging" was responsible avoids accountability. "The reason that people love that answer is it actually washes your hands of accountability," he said.
The bubble debate has drawn other prominent voices. Earlier in the month, Ray Dalio, founder of Bridgewater Associates, described AI as a classic bubble at the Forbes Global CEO Conference in Singapore, saying "I think we're close to that." Dalio pointed to the large volume of debt raised to fund AI investment as the major risk factor.
The debt figures underscore that concern. According to iShares, Amazon, Microsoft, Alphabet, Meta and Oracle issued nearly $200 billion of investment-grade debt in the first half of 2026, almost twice their issuance across all of 2025. Visser, head of AI Macro Nexus Research at 22V Research, argues that the primary driver of a bubble is a mismatch between demand and supply rather than valuation, and expects demand to increasingly come from AI agents, whose numbers he projects will grow from thousands today to billions next year.
Economist Paul Krugman, meanwhile, said the AI boom is crowding out investment elsewhere in the economy, an effect he said the dot-com boom did not produce and that is already measurable regardless of whether a bubble exists. He described this as "not a hypothetical risk."
On the recent chip stock sell-off, Griffin said the common explanation that hedge fund "deleveraging" was responsible avoids accountability. "The reason that people love that answer is it actually washes your hands of accountability," he said.
The bubble debate has drawn other prominent voices. Earlier in the month, Ray Dalio, founder of Bridgewater Associates, described AI as a classic bubble at the Forbes Global CEO Conference in Singapore, saying "I think we're close to that." Dalio pointed to the large volume of debt raised to fund AI investment as the major risk factor.
The debt figures underscore that concern. According to iShares, Amazon, Microsoft, Alphabet, Meta and Oracle issued nearly $200 billion of investment-grade debt in the first half of 2026, almost twice their issuance across all of 2025. Visser, head of AI Macro Nexus Research at 22V Research, argues that the primary driver of a bubble is a mismatch between demand and supply rather than valuation, and expects demand to increasingly come from AI agents, whose numbers he projects will grow from thousands today to billions next year.
Economist Paul Krugman, meanwhile, said the AI boom is crowding out investment elsewhere in the economy, an effect he said the dot-com boom did not produce and that is already measurable regardless of whether a bubble exists. He described this as "not a hypothetical risk."
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