Citigroup cannot recoup Revlon payouts after nearly $900 million gaffe: US judge

Some lenders returned money they were sent, but 10 asset managers including Brigade Capital Management, HPS Investment Partners and Symphony Asset Management refused, prompting Citigroup's lawsuit to recoup the estimated $501 million they received.

Citigroup had argued that the lenders should return the money because they knew or should have known it made a mistake, and that Revlon could not afford the payment.

But in a 101-page decision, following a six-day trial in December, Furman noted that the transfers matched "to the penny" what the lenders were owed, and said it appeared there had never been a mistake of this size before.

"The non-returning lenders believed, and were justified in believing, that the payments were intentional," Furman wrote. "To believe otherwise - to believe that Citibank, one of the most sophisticated financial institutions in the world, had made a mistake that had never happened before, to the tune of nearly $1 billion - would have been borderline irrational."

Citigroup had no immediate comment. Lawyers for the bank and for the asset managers did not immediately respond to requests for comment.

Administrative agents typically distribute interest payments and perform back-office services for clients such as Revlon.

Industry groups have said a ruling against Citigroup could expose banks to excessive liability risks.