Asset-Backed Securities (ABS) are bonds issued by special purpose vehicles that own pools of financial assets — auto loans, credit card receivables, student loans, equipment leases, personal loans, royalties, or other cash-flow-generating assets. ABS is one of the largest segments of the structured finance market, providing essential funding to lenders and attractive fixed-income investments to institutional buyers.
Each ABS transaction is defined primarily by its collateral type. Auto ABS — perhaps the most liquid and vanilla segment of the ABS market — is backed by pools of retail auto loans or auto leases. Collateral characteristics include the credit score distribution of borrowers, loan-to-value ratios, geographic diversification, and seasoning (how long the loans have been outstanding). Auto ABS typically has short average lives (2–3 years) and high prepayment speeds, making it a short-duration fixed income instrument.
Credit card ABS is different in structure because credit card receivables are revolving — balances are repaid and re-drawn, not amortizing. Credit card ABS has a revolving period during which the trust reinvests principal repayments into new receivables, followed by an amortization period when principal is returned to investors. The trust relies on the continuing origination of new receivables by the credit card issuer — creating "early amortization" triggers that accelerate repayment if the originator's portfolio performance deteriorates.
Student loan ABS (both federal and private) has unique characteristics driven by income-based repayment options, forbearance rights, and the non-dischargeable nature of most student debt in bankruptcy. Mortgage-backed securities (MBS) are often classified separately from ABS — agency MBS backed by Fannie Mae and Freddie Mac guarantees are essentially government-backed securities, while non-agency MBS (private-label) carries credit risk from the underlying mortgage collateral.
ABS due diligence requires analysis of the collateral pool (static pool analysis, delinquency and loss history, prepayment behavior), the deal structure (subordination, excess spread, reserve account), the originator's underwriting quality and servicing capabilities, and the legal framework (true sale, bankruptcy remoteness). Performance data published monthly in servicer reports provides ongoing visibility into pool performance.