Patrik Edsparr will become the first CEO of Citadel Europe, effective in July. Mr. Edsparr, who will be based in London, also will head the hedge fund managers global fixed-income practice, said Sophie Sohn, a Citadel spokeswoman. That is also a new position. Mr. Edsparr was a member of the executive team and global head of rates, securitized products, proprietary positioning and principal investments at JPMorgan Chase, based in the banks London office. Mary Sedarat, a JPMorgan Chase spokeswoman, did not respond to phone and e-mail requests for information about Mr. Edsparrs replacement.