European policy makers are delaying a key piece of their post-crisis efforts to regulate derivatives, postponing new standards for banks to set aside cash as a cushion against the risk of certain swaps trades going bad.

The European Union's executive arm won't meet a September deadline for completing collateral standards, known as margin, on certain swaps that aren't routed through so-called clearing houses, said spokeswoman Vanessa Mock. Clearing houses take fees to guarantee trades.