• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
FinanceMarkets

‘Black Swan’ investor warns the ‘greatest bubble in human history’ is about to pop and stocks could lose more than half their value

Jason Ma
By
Jason Ma
Jason Ma
Weekend Editor
Down Arrow Button Icon
Jason Ma
By
Jason Ma
Jason Ma
Weekend Editor
Down Arrow Button Icon
July 20, 2024, 5:36 PM ET
Mark Spitznagel speaks at podium
Mark Spitznagel, chief investment officer of Universa Investments, speaking in 2017.Misha Friedman—Bloomberg via Getty Images

Mark Spitznagel, cofounder and chief investment officer of the hedge fund Universa Investments, has frequently sounded the alarm about bubbles popping and other extreme market events.

Recommended Video

In an interview with the Wall Street Journal, the long-time associate of The Black Swan author Nassim Nicholas Taleb said a severe crash is on the way and stocks could lose more than half their value, while acknowledging that his latest warning should come as no surprise.

“I think we’re on the way to something really, really bad—but of course I’d say that,” Spitznagel said.

His hedge fund specializes in tail-risk hedging, a strategy that seeks to prevent losses from unforeseeable and unlikely economic catastrophes, also known as “black swans.”

He had famously made astronomical gains on such events, including the COVID-19 pandemic, and more recently has warned about U.S. debt and the “greatest credit bubble in human history.“

Even as stocks have come well off recent highs, with the S&P 500 suffering its worst week since April, Spitznagel expects the market rally to continue for months and get wilder because the “Goldilocks phase” of slowing inflation and rate cuts from the Federal Reserve will stoke bets that markets will continue running higher.

But he also warned Fed rate cuts are often the opening signal for severe market reversals, telling the Journal that “You don’t feel like a fool for making a bearish argument.”

Spitznagel sees parallels between today and the dot-com bust but thinks the selloff that’s coming will be even worse than that. That’s because market extremes now represent the “greatest bubble in human history,” he added.

With U.S. debt already at historic levels, the federal government will have less capacity to respond, and the economy could enter a recession by the end of this year, he predicted.

Spitznagel’s latest comments echo what he told Fortune’s Will Daniel in April, when he said investors’ positive sentiment alone can’t carry markets higher indefinitely and that higher rates are weighing on the economy.

“The Fed did a lot. And now it’s sort of jawboning its way out of it. But it can’t take back what it did,” he said. “Markets follow fundamentals at the end of the day, but you can have these little Goldilocks zones where it can get sort of untethered.”

Fed Chairman Jerome Powell and other central banks have hinted in recent days that inflation is finally coming under control and that rate cuts may be coming soon, with markets widely seeing the first one in September.

But Spitznagel said in April that fallout from the “the fastest, greatest tightening ever, by some regards, into the greatest credit bubble of human history” can’t be avoided, adding “That’s when things are going to be really bad—and at that point, it’s probably also too late to get out.”

Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Author
Jason Ma
By Jason MaWeekend Editor

Jason Ma is the weekend editor at Fortune, where he covers markets, the economy, finance, and housing.

See full bioRight Arrow Button Icon

Latest in Finance

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Newsletters
  • Magazine
  • Features
  • Commentary
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map

Latest in Finance

Economyjerome powell
Powell blasts DOJ criminal probe as attack on Fed independence. ‘Public service sometimes requires standing firm in the face of threats’
By Jason MaJanuary 11, 2026
1 hour ago
EnergyIran
Oil prices rise as bloody crackdown on Iran protests suggests Tehran fears a ‘dire security threat to the regime’ with loyalty of forces in doubt
By Jason MaJanuary 11, 2026
2 hours ago
AsiaChina
What global executives need to ask about China in 2026
By Joe Ngai and Jeongmin SeongJanuary 11, 2026
3 hours ago
Investingtech stocks
Magnificent 7’s stock market dominance shows signs of cracking
By Jeran Wittenstein, Ryan Vlastelica and BloombergJanuary 11, 2026
5 hours ago
EconomyJobs
A Supreme Court ruling that strikes down Trump’s tariffs would be the fastest way to revive the stalling job market, top economist says
By Jason MaJanuary 11, 2026
5 hours ago
PoliticsVenezuela
Trump vows to protect Venezuela and warns Maduro ally Cuba ‘I strongly suggest they make a deal, BEFORE IT IS TOO LATE’
By Seung Min Kim and The Associated PressJanuary 11, 2026
10 hours ago

Most Popular

placeholder alt text
Economy
As U.S. debt soars past $38 trillion, the flood of corporate bonds is a growing threat to the Treasury supply
By Jason MaJanuary 10, 2026
1 day ago
placeholder alt text
Economy
Trump may be raising your taxes with his tariffs but he could actually cut inflation with them, too, SF Fed says
By Jake AngeloJanuary 6, 2026
5 days ago
placeholder alt text
Health
Bill Gates warns the world is going 'backwards' and gives 5-year deadline before we enter a new Dark Age
By Eleanor PringleJanuary 9, 2026
3 days ago
placeholder alt text
Success
Gen Z are arriving to college unable to even read a sentence—professors warn it could lead to a generation of anxious and lonely graduates
By Preston ForeJanuary 9, 2026
2 days ago
placeholder alt text
AI
This CEO laid off nearly 80% of his staff because they refused to adopt AI fast enough. 2 years later, he says he'd do it again
By Nick LichtenbergJanuary 11, 2026
7 hours ago
placeholder alt text
Economy
A Supreme Court ruling that strikes down Trump's tariffs would be the fastest way to revive the stalling job market, top economist says
By Jason MaJanuary 11, 2026
5 hours ago

© 2025 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.