JPMorgan stopped counterparty trading with Citadel last month in protest at the $20 billion hedge fund’s recent hires of the bank’s staff. Employees at JPMorgan were told to stop trading stocks, bonds and currencies with Citadel. However, the dispute lasted only 24 hours. Both parties declined to comment but sources say relations between the two firms began to sour in March, when Patrik Edsparr left JPMorgan to run Europe and fixed income for Citadel. There have been several...
