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

Billionaire Ken Griffin receives rare apology from IRS after his tax returns were leaked to journalists

By
Bloomberg
Bloomberg
,
Sabrina Willmer
Sabrina Willmer
, and
David Voreacos
David Voreacos
Down Arrow Button Icon
By
Bloomberg
Bloomberg
,
Sabrina Willmer
Sabrina Willmer
, and
David Voreacos
David Voreacos
Down Arrow Button Icon
June 26, 2024, 1:55 PM ET
Ken Griffin mid-word with his hand raised in front of a purple background.
Citadel CEO Ken Griffin got a rare apology from the IRS after his tax returns were leaked.Apu Gomes/Getty Images

The US Internal Revenue Service issued an unusual public apology to hedge fund manager Ken Griffin for failing to protect his confidential tax data from being stolen and leaked to the media by a contractor now in prison. 

Recommended Video

That contractor, Charles Littlejohn, pulled off one of the most egregious security breaches in IRS history, stealing tax return information about Griffin and other billionaires, including former President Donald Trump, Elon Musk and Jeff Bezos. Lawmakers and government watchdogs have repeatedly warned about about lax safeguards at the IRS, which processed more than 270 million tax returns in fiscal year 2023. Littlejohn gave Trump’s tax information to the New York Times and the data on the others to ProPublica. 

The IRS “sincerely apologizes to Mr. Kenneth Griffin and the thousands of other Americans whose personal information was leaked to the press,” the agency said Tuesday in a statement. The agency acknowledged it “failed to prevent Mr. Littlejohn’s criminal conduct and unlawful disclosure of Mr. Griffin’s confidential data.” 

The apology is part of a settlement with the founder of Citadel LP, who sued the IRS for neglecting to put in place safeguards that led to his private financial information appearing in ProPublica articles. Agencies like the US Government Accountability Office and the Treasury Inspector General for Tax Administration have sounded the alarm for years that such breaches were possible. 

With the settlement, the IRS said it has “made substantial investments in its data security” to safeguard taxpayer data. 

“The agency believes that its actions and the resolution of this case will result in a stronger and more trustworthy process for safeguarding the personal information of all taxpayers,” according to the IRS statement. 

Griffin applauded the outcome. “I am grateful to my team for securing an outcome that will better protect American taxpayers and that will ultimately benefit all Americans,” he said in a statement. 

Littlejohn pleaded guilty to stealing and leaking the tax returns of billionaires including Michael Bloomberg, majority owner of Bloomberg News parent Bloomberg LP. Littlejohn was sentenced in January to five years in prison. 

While it’s unusual for the IRS to apologize to an individual, this isn’t the first time the IRS has made a public apology. Last year the IRS acknowledged wrongdoing to millions of taxpayers who erroneously received notices and tax bills with incorrect information. The IRS also expressed regret in 2017 for giving extra scrutiny to non-profit groups with conservative sounding names.

The case is Griffin v. Internal Revenue Service, 22-cv-24023, US District Court, Southern District of Florida.

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 Authors
By Bloomberg
See full bioRight Arrow Button Icon
By Sabrina Willmer
See full bioRight Arrow Button Icon
By David Voreacos
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

gen z
CommentaryCareers
The entry-level job market is the worst it’s been in 37 years. Stop blaming Gen Z
By Janelle Jones and Nia LawMarch 21, 2026
10 minutes ago
A woman looks frustrated a computer
AIWomen
Women are avoiding the very technology that threatens them most, as expert warns of a ‘two-tiered AI economy’ approaching
By Jacqueline MunisMarch 21, 2026
27 minutes ago
AIFinance
Why Block’s COO is tracking ‘gross profit per employee’—and how AI is on track to double it to $2 million
By Sheryl EstradaMarch 21, 2026
40 minutes ago
ILLUSTRATION - 17 February 2026, Bavaria, Munich: A beverage can with a soft drink and numerous sugar cubes lie on a table. Photo: Sven Hoppe/dpa (Photo by Sven Hoppe/picture alliance via Getty Images)
EnergyIran
Iran war is making the world a little less sweet as oil soars at the worst possible time for sugar
By Eva RoytburgMarch 21, 2026
1 hour ago
home for sale
AIChatGPT
A man let ChatGPT sell his home. It beat every agent’s estimate by $100K—and closed in 5 days
By Jake AngeloMarch 21, 2026
2 hours ago
US President Donald Trump, left, and Marco Rubio, US secretary of state, speak to members of the media on the South Lawn of the White House before boarding Marine One in Washington, DC, US, on Friday, March 20, 2026. US officials said the White House is sending more than 2,000 additional Marines to the Middle East as it weighs a plan to seize Iran's Kharg Island oil export hub, a ground operation that would carry huge risks for President Donald Trump.
EnergyIran
Three weeks into the Iran war that’s requested $200 billion, here’s what success for Trump might look like
By Jordan BlumMarch 21, 2026
2 hours 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.