Goldman Sachs on Wednesday announced a reshuffling of top executives within its all-important fixed-income, commodities and currencies sales and trading business, according to internal memos.

The firm said that Tom Cornacchia, co-head of global FICC sales has decided to retire. He will be replaced by John Willian, joining current global FICC sales co-head Jim Esposito. Willian is currently global head of prime services, which includes prime brokerage, clearing and futures businesses.