Jamie Dimon sees ‘exuberance’ in markets. That’s a loaded word when it comes to bubbles popping
Jamie Dimon has expressed concerns about excessive optimism in the markets, particularly regarding artificial intelligence and Big Tech valuations. His remarks echo Alan Greenspan's famous warning about 'irrational exuberance' from the late 1990s, suggesting that current market conditions may be unsustainable. Analysts have noted that the current AI boom is significantly larger than the previous technology bubble, raising questions about its long-term viability.
- ▪Jamie Dimon warned that markets may be showing 'too much exuberance' in a recent interview.
- ▪The current AI boom is estimated to be 60% larger than the late-1990s technology bubble.
- ▪Analysts suggest that the concentration of technology investment leaves the broader economy vulnerable if growth slows.
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| Original publisher | Fortune |
| Canonical URL | https://fortune.com/2026/05/22/jamie-dimon-exuberance-stock-market-bubble-alan-greenspan-history/ |
| Publication time | Fri, 22 May 2026 14:17:45 +0000 |
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Opening excerpt (first ~120 words) tap to expand
Jamie Dimon is starting to sound a bit like Alan Greenspan—and that should make investors nervous.Recommended Video The JPMorgan Chase CEO warned in a Bloomberg TV interview this week that markets may be showing “too much exuberance,” pointing to frothy valuations around artificial intelligence and the Big Tech giants building out the infrastructure behind it. His choice of words evokes Greenspan’s infamous “irrational exuberance” line from 1996, when the then–Federal Reserve chair cautioned that animal spirits can push asset prices far beyond what fundamentals justify, leaving them vulnerable to painful reversals.
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