Sam Bankman-Fried on Friday lost his bid to overturn his fraud conviction and 25-year prison sentence over the collapse of the FTX cryptocurrency exchange he founded.

The decision was handed down by a three-judge panel of the New York-based second US circuit court of appeals.

Bankman-Fried, who had been one of the cryptocurrency sector’s most influential figures and a multibillionaire before FTX’s spectacular collapse in 2022, was found guilty on seven felony charges by a federal jury in Manhattan in 2023.

Prosecutors with the Manhattan US attorney’s office, which prosecuted the case, said he stole $8bn from FTX customers in what they termed a “fraud of epic proportions”.

Bankman-Fried had pleaded not guilty to the two counts of fraud and five counts of conspiracy that he faced. At his trial, he admitted to making mistakes running FTX, but testified that he never stole funds.