Two associates of FTX founder Sam Bankman-Fried have pleaded guilty for their roles in fraud that contributed to the cryptocurrency exchange's collapse and are cooperating with federal investigators.

Caroline Ellison, the former chief executive of Alameda Research, a trading firm tied to FTX, and Gary Wang, FTX's former chief technology officer, both pleaded guilty to criminal offences similar to those Bankman-Fried was charged with last week.