Synthetic Asset-Backed Security (Synthetic ABS)¶
A synthetic asset-backed security (synthetic ABS) is a structured credit product that replicates the economic exposure of a traditional asset-backed security without holding the underlying assets. Instead of owning a pool of loans or receivables, the issuer uses credit derivatives — typically credit default swaps (CDS) — to transfer the credit risk of a reference portfolio. The synthetic ABS pays interest and principal based on the performance of that reference portfolio, without the balance sheet costs of purchasing the assets directly.
HOW IT WORKS¶
A synthetic ABS is built around one of two structures. In a credit-linked note (CLN), an investor buys a note from a special purpose vehicle (SPV), which purchases high-quality collateral and simultaneously sells CDS protection on a reference portfolio. The investor earns the collateral coupon plus the CDS premium but absorbs losses if a credit event occurs. In a synthetic CDO, a sponsor references a portfolio of bonds or loans and issues tranches of varying seniority — equity, mezzanine, and senior — each with a defined attachment point that determines when losses begin to erode that tranche's principal.
Loss absorption follows a strict waterfall. If a $500 million reference portfolio has a $25 million equity tranche (5% attachment point), the equity tranche is fully wiped out once portfolio losses exceed 5%, or $25 million. Losses between 5% and 20% reduce the mezzanine tranche. The senior tranche is only impaired once losses exceed the mezzanine exhaustion point.
Key risks include model risk — correlation assumptions between reference assets directly determine tranche pricing and proved unreliable during the 2008 financial crisis — and counterparty risk, since a CDS protection seller default removes the hedging benefit.
IN TAPEBOARD¶
In the Tapeboard terminal, synthetic ABS positions appear under the Structured Credit instrument class. Traders can view tranche-level exposure, attachment and detachment points, and real-time CDS spread data for the reference portfolio. The Credit Risk panel displays cumulative loss estimates against each tranche's attachment point, allowing traders to monitor how close a position is to principal impairment. Use the Scenario Analysis tool to stress-test reference portfolio loss rates and project the impact on mezzanine and senior tranche principal.