(Bloomberg) -- Credit Suisse Group AG’s prime-brokerage co-heads are leaving the bank in the wake of its $4.7 billion loss from the implosion of Archegos Capital Management, according to a company memo.John Dabbs and Ryan Nelson will step down immediately while assisting Credit Suisse through mid-May on an orderly transition, the bank said in the memo. Roger Anerella was appointed interim head of prime services, while Doug Crofton was made head of Americas cash with responsibility for execution and advisory sales and Stuart McGuire put in a similar role for Europe, Middle East and Africa.