Credit default swaps (CDS) are frequently credited with being the cause of AIG’s collapse during the financial crisis. A Reuters article from September 2008, for example, notes “[w]hen you hear that the collapse of AIG […] might lead to a systemic collapse of the global financial system, the feared culprit is, largely, that once-obscure […] instrument known as a credit default swap.” Yet, despite the prominent role that CDS played during the financial crisis, little is known about how individual financial institutions utilize CDS contracts on individual companies. In a recent New York Fed staff report, we assess the choice banks face when trading the idiosyncratic credit risk of a firm, and argue that banks’ participation decisions have been affected in the post-regulation period, either by direct changes in market structure or by changes in the relative cost of pursuing different strategies.