• 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
Fortune Secondary Logo
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
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • 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
  • Group Subscriptions
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Finance

Palantir wants to bring back the draft just as the Selective Service preps for automatic registration
PoliticsMilitary
Palantir wants to bring back the draft just as the Selective Service preps for automatic registration
By Catherina GioinoApril 20, 2026
1 minute ago
Signs opposing a proposed data center in Monterey Park, CA.
AIData centers
Half of all new electricity demand in the U.S. last year came from data centers—just as public opinion of them plummets
By Tristan BoveApril 20, 2026
1 hour ago
electrician
EconomyJobs
This talent CEO says laid-off tech workers are ignoring a $300K ‘white-collar trade job’ with 81K openings a year
By Jake AngeloApril 20, 2026
4 hours ago
UAE officials reportedly warned they may be forced to use yuan or other currencies if they run low on dollars amid the Iran war
EconomyCurrency
UAE officials reportedly warned they may be forced to use yuan or other currencies if they run low on dollars amid the Iran war
By Jason MaApril 20, 2026
4 hours ago
A Spirit Airlines plane flies over a highway
EnergyAirline industry
Spirit Airlines looked like it was in the clear but rising fuel costs are threatening its bankruptcy its exit
By Jacqueline MunisApril 20, 2026
6 hours ago
Top CD rates from major banks April 20, 2026: Chase CDs, Bank of America CDs, Citibank CDs, and more
BankingCertificates of Deposit (CDs)
Top CD rates from major banks on April 20, 2026: Chase CDs, Bank of America CDs, Citibank CDs, and more
By Danny BakstApril 20, 2026
7 hours ago

Most Popular

Thousands of CEOs admit AI had no impact on employment or productivity—and it has economists resurrecting a paradox from 40 years ago
AI
Thousands of CEOs admit AI had no impact on employment or productivity—and it has economists resurrecting a paradox from 40 years ago
By Sasha RogelbergApril 19, 2026
1 day ago
Markets shudder as Strait of Hormuz starts resembling a combat zone. 'We're prepared to subject you to disabling fire'
Energy
Markets shudder as Strait of Hormuz starts resembling a combat zone. 'We're prepared to subject you to disabling fire'
By Jason MaApril 19, 2026
21 hours ago
The explosion of U.S. debt is wiping out the 'safety premium' of Treasury bonds, and time is running out for an orderly fiscal solution, IMF warns
Economy
The explosion of U.S. debt is wiping out the 'safety premium' of Treasury bonds, and time is running out for an orderly fiscal solution, IMF warns
By Jason MaApril 19, 2026
1 day ago
Elon Musk bans résumés and cover letters in hiring for his chip team. These are the 3 bullet points he’s looking for instead
Future of Work
Elon Musk bans résumés and cover letters in hiring for his chip team. These are the 3 bullet points he’s looking for instead
By Jake AngeloApril 19, 2026
1 day ago
'We should absolutely be concerned about noncollege-educated men today': higher rents, living at home, falling out of the labor market
Economy
'We should absolutely be concerned about noncollege-educated men today': higher rents, living at home, falling out of the labor market
By Catherina GioinoApril 18, 2026
3 days ago
The $6 billion Vatican Bank was beset by scandals, disastrous investments—and ties to the Mafia. How Pope Francis tried to fix it
Banking
The $6 billion Vatican Bank was beset by scandals, disastrous investments—and ties to the Mafia. How Pope Francis tried to fix it
By Marco Quiroz-GutierrezApril 18, 2026
2 days ago

© 2026 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.