JPMorgan has named managing directors Andy Brindle, global head of credit derivatives, and Bertrand Des Pallieres, head of interest rate derivatives, as global co-heads of structured credit, in an expansion of their existing roles. Both will replace Romita Shetty who held the position until December and is still at the firm evaluating whether she will accept another role. Brindle declined to comment. Des Pallieres did not return calls. Shetty could not be reached for comment. Michael Dorfsman, a spokesman, confirmed the move but declined to elaborate.