What is a credit default swap? A credit default swap (CDS) is a bilateral transaction which takes its underlying value from the credit risk of a third party, known as the 'reference entity', and specific or generic obligations of the reference entity, which are known as ‘reference obligations’. The reference entity can be a corporate, sovereign, municipality or a similar organisation and is not a party to the CDS. The primary purpose of a CDS is to isolate the credit risk of the reference entity from all of its other risks and from ownership of the reference entity’s obligations, including the reference obligation. One party to the CDS (known as the 'protection seller') assumes the credit risk of the reference entity and the other party (known as the 'protection buyer') makes periodic payments to the protection seller. If a credit event (a default, bankruptcy, or other situation which is recognised as affecting the creditworthiness of the reference entity) occurs, the protection seller’s payment obligations under the CDS will be triggered and the