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CFA® Level I · Fixed Income · free lesson
Fixed-Income Securitization
Securitization turns pools of loans, such as mortgages, car loans and credit card balances, into bonds that investors can buy. It funds a large share of consumer and housing credit, but it also played a central role in the 2007-08 crisis. This module explains why securitization exists, who does what in a deal, how tranching redistributes credit and prepayment risk, and how covered bonds offer a different way to fund loans from the same kinds of assets.
What you will learn
1. Explain the benefits of securitization for originators, investors, the economy and financial markets, and identify the risks it can create.
- Securitization pools loans and sells them to a separate entity that issues ABS backed by their cash flows.
- Originators gain funding, capital relief and risk transfer; senior ABS can be rated above the originator.
- Investors gain diversified exposure and a choice of risk through tranches.
- The economy benefits from wider access to credit and broader risk sharing.
- Risks: weak underwriting incentives (originate-to-distribute), complexity, over-reliance on ratings.
2. Describe the securitization process and the roles of the parties involved, including the originator, special purpose entity, servicer and trustee.
- Originator makes and sells the loans; the SPE buys them in a true sale and issues the ABS.
- The SPE is bankruptcy remote: the originator's creditors cannot claim the pool.
- Servicer collects payments and handles delinquencies; trustee protects investors and runs the waterfall.
- ABS investors bear the credit risk of the pool, not of the originator.
- Dependence on the servicer is a key operational risk; backup servicers mitigate it.
3. Describe typical securitization structures, including credit tranching and time tranching, and calculate how losses are allocated across tranches.
- Credit tranching: cash paid top down, losses absorbed bottom up.
- Credit enhancement of a tranche = share of the deal below it (plus any overcollateralization).
- Time tranching (sequential pay) redistributes prepayment risk across short and long tranches.
- Short sequential tranches are protected from extension risk; long tranches from contraction risk.
- Thin mezzanine tranches are highly leveraged to pool losses.
4. Describe the features and types of covered bonds and contrast them with asset-backed securities.
- Covered bonds are senior bank debt backed by a ring-fenced cover pool: dual recourse.
- The cover pool stays on the bank's balance sheet and is dynamic (non-performing loans replaced).
- Legal overcollateralization and eligibility rules protect investors.
- Hard bullet, soft bullet and conditional pass-through redemption regimes.
- ABS: SPE issuer, recourse to the pool only, usually static and tranched.
Module at a glance
- Securitization pools loans, sells them to an SPE and issues ABS backed by their cash flows.
- Benefits: funding and capital relief for originators, diversified tailored exposure for investors, more credit for the economy.
- Risks include weak underwriting incentives, complexity and over-reliance on ratings; risk retention aligns incentives.
- Key parties: originator, bankruptcy-remote SPE, servicer, trustee, arranger, rating agencies.
- Credit tranching: cash paid top down, losses absorbed bottom up; enhancement = everything below a tranche.
- Time tranching (sequential pay) redistributes prepayment risk between short and long tranches.
- Covered bonds: issuer plus ring-fenced dynamic cover pool (dual recourse), on balance sheet, usually one tranche.
This free module has 4 lessons, 13 practice questions with full explanations.