The Internal Revenue Service issued a rare public apology today to billionaire hedge fund director Ken Griffin and thousands of other wealthy Americans for a data breach that exposed their personal financial information.

The apology came as part of a settlement between Griffin and the U.S. tax agency over a 2022 lawsuit. Griffin had sued the agency after a data breach resulted in ProPublica’s revealing private data on some of the wealthiest U.S. taxpayers, including himself, former President Donald Trump, Elon Musk and others, Bloomberg reported. A former IRS contractor, Charles Littlejohn, pleaded guilty to stealing the returns and, earlier this year, was sentenced to five years in prison.

Griffin withdrew his lawsuit Monday.

“The Internal Revenue Service sincerely apologizes to Mr. Kenneth Griffin and the thousands of other Americans whose personal information was leaked to the press,” the IRS statement posted online noted, adding Littlejohn’s illegal disclosures “violated the terms of his contract and betrayed the trust,” of the American people.

“The IRS takes its responsibilities seriously and acknowledges that it failed to prevent Mr. Littlejohn’s criminal conduct and unlawful disclosure of Mr. Griffin’s confidential data. Accordingly, the IRS assures Mr. Griffin and the other victims of Mr. Littlejohn’s actions that it has made substantial investments in its data security to strengthen its safeguarding of taxpayer information,” the statement added.

As a result of the case, the agency said it was committed to taking further steps to address any security deficiencies identified during the investigation of the case.

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