Collateralized debt obligation investing in credit default swaps or other non-cash assets to accumulate exposure to a portfolio of fixed-income assets. Normally, these are divided into credit tranches according to the credit risk level assumed. Lower tranches make up the initial investments into these debt obligations while senior tranches need not to make an initial investment. These tranches receive regular payments based on the cash flows from these swaps. The synthetic CDO and its investors will take responsibility on the losses in case the event takes place in the fixed income portfolio.