A synthetic CDO is an investment in which the underlying collateral is a portfolio of CDS. The issuer does not own the underlying assets but retains the credit and economic risks. The recent CDOs make use of “unfunded” senior tranches. The super senior investor will enter into a CDS with the SPV. The super senior is typically unfunded, matching the unfunded nature of CDS. The super senior tranche provides second-loss credit protection. As in cash CDOs, the rated note and equity pieces are generally funded. Synthetic deals can have a final maturity of 5–7 years.
Example: Collateral pool No of reference entities: 100 Notional amount of CDS: Euro 5 million Total size: Euro 500 million The example details a possible tranching of a 500 million portfolio into four tranches. Losses in the portfolio up to 5 percent (Euro 25 million of losses in total) would result in a complete write-down of the equity tranche. Further losses in the portfolio in excess of 5 percent and up to 9.5 percent (losses of Euro 47.5 million in total) would then result in a write-down of principal in the mezzanine tranche. If each credit had a 50 percent recovery rate, each default in the underlying portfolio would result in a loss of Euro 2.5 million. Therefore, it would take 10 defaults to write-down the equity tranche.