FTX, the cryptocurrency exchange launched by Sam Bankman-Fried, said it fired three of the founder’s top deputies.

Gary Wang, an FTX co-founder and its chief technology officer; FTX engineering director Nishad Singh; and Caroline Ellison, who ran Mr. Bankman-Fried’s trading arm, Alameda Research, were terminated from those roles after FTX tapped John J. Ray to oversee the companies’ bankruptcy, an FTX spokeswoman said late Friday.