Reading 42: Introduction to Asset-Backed Securities

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Securitization Process and Benefits5 min
Securitization involves transferring assets from the originator to a Special Purpose Entity (SPE), which then issues securities to investors. This separation isolates the assets from the originator's bankruptcy risk. The primary benefits include reduced intermediation costs, lower funding costs for borrowers, and increased liquidity for financial assets. The process transforms illiquid loans into tradeable securities.

Key Points

  • Benefits: Lower costs, higher liquidity, risk diversification.
  • Parties: Seller (Originator), SPE (Issuer/Trust), Servicer.
  • SPE is a bankruptcy-remote entity.
  • Asset-backed securities allow banks to lend more by freeing up capital.
Residential Mortgage-Backed Securities (RMBS)6 min
RMBS are backed by pools of residential mortgages. Agency RMBS are issued by government-related entities and have minimal credit risk but significant prepayment risk. Prepayments occur when borrowers refinance or sell homes. This risk is measured using the Single Monthly Mortality (SMM) rate and Conditional Prepayment Rate (CPR). The PSA benchmark describes prepayment speeds relative to a standard model.

Key Points

  • Agency RMBS: Ginnie Mae (Govt backed), Fannie/Freddie (GSEs).
  • Prepayment Risk: Contraction (rates fall) vs. Extension (rates rise).
  • Pass-through securities pass net interest and principal to investors.
  • PSA 100 represents the standard prepayment benchmark speed.
Collateralized Mortgage Obligations (CMOs)6 min
CMOs are structured securities backed by mortgage pass-throughs. They redistribute prepayment risk among different bond classes or tranches. Sequential-pay CMOs pay principal to tranches in a specific order, creating short and long average-life bonds. PAC tranches offer predictable cash flows within a range of prepayment speeds (the collar), protected by support tranches that absorb excess prepayment variability.

Key Points

  • Sequential Pay: Tranches retired in order; creates time tranching.
  • PAC Tranches: Reduced contraction and extension risk; defined schedule.
  • Support Tranches: Absorb prepayment deviations; high risk.
  • CMOs do not eliminate risk; they redistribute it.
Commercial MBS and Non-Mortgage ABS6 min
CMBS are backed by commercial loans which are nonrecourse, meaning lenders rely on the property's income. Credit analysis focuses on DSC and LTV ratios. CMBS feature call protection to limit prepayments. Auto loan ABS are backed by amortizing loans, while credit card ABS are backed by revolving receivables with a lockout period during which principal is reinvested rather than paid out.

Key Points

  • CMBS: Nonrecourse loans; rely on DSC (>1.0 desired) and LTV.
  • Call Protection: Defeasance, yield maintenance, prepayment lockouts.
  • Credit Card ABS: Revolving debt; lockout period; early amortization triggers.
  • Auto Loan ABS: Fully amortizing; similar prepayment dynamics to mortgages.
CDOs and Covered Bonds5 min
CDOs are managed portfolios of debt securities structured into senior, mezzanine, and equity tranches. The equity tranche absorbs the first losses. Covered bonds are debt securities issued by financial institutions that remain on the issuer's balance sheet. They provide recourse to both the issuer and a dynamic cover pool of high-quality assets.

Key Points

  • CDOs: Actively managed; involve arbitrage or balance sheet motivations.
  • CDO Structure: Senior, Mezzanine, Equity (Subordinated).
  • Covered Bonds: On-balance sheet; dual recourse; dynamic cover pool.
  • Covered bonds usually have lower yields than ABS due to higher security.

Questions

Question 1

What is the primary benefit of the securitization process for the economy and financial markets?

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Question 2

In a securitization transaction, which entity is responsible for collecting payments from borrowers and handling delinquencies?

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Question 3

Which feature best describes a 'bankruptcy remote' entity in the context of asset-backed securities?

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Question 4

In a structure with time tranching, how are principal repayments typically distributed?

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Question 5

A senior/subordinated structure in an asset-backed security is primarily used to redistribute which type of risk?

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Question 6

Which ratio is calculated as the loan amount divided by the value of the collateral property?

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Question 7

What is the primary characteristic of a nonrecourse mortgage loan?

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Question 8

Which of the following is considered an agency RMBS issuer backed by the full faith and credit of the U.S. government?

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Question 9

Why is the pass-through rate on a mortgage pass-through security typically lower than the weighted average coupon (WAC) of the underlying loans?

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Question 10

What is 'contraction risk' in the context of mortgage-backed securities?

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Question 11

If a mortgage pool's Conditional Prepayment Rate (CPR) is expected to match the PSA standard benchmark, the PSA is said to be:

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Question 12

Which statement best describes the Single Monthly Mortality (SMM) rate?

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Question 13

In a sequential pay CMO with two tranches (Tranche A and Tranche B), which tranche has the greatest contraction risk?

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Question 14

What is the primary purpose of a Planned Amortization Class (PAC) tranche in a CMO?

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Question 15

Which CMO tranche absorbs prepayment risk in excess of the PAC collar?

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Question 16

If a CMO's prepayment speed falls outside the initial PAC collar, the PAC tranche is referred to as:

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Question 17

Internal credit enhancement for non-agency RMBS includes which of the following?

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Question 18

The 'shifting interest mechanism' in a senior/subordinated structure is designed to:

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Question 19

Commercial mortgage-backed securities (CMBS) loans are typically:

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Question 20

Which ratio is used to assess the credit risk of a commercial property by comparing net operating income to debt service?

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Question 21

Which CMBS call protection mechanism involves replacing the mortgage collateral with a portfolio of government securities?

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Question 22

What is 'balloon risk' in a commercial mortgage?

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Question 23

Auto loan ABS are typically backed by which type of assets?

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Question 24

During the lockout period of a credit card ABS, principal payments made by cardholders are:

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Question 25

Which entity manages the portfolio of debt obligations in a Collateralized Debt Obligation (CDO)?

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Question 26

What distinguishes a covered bond from a standard asset-backed security?

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Question 27

In a CDO structure, the tranche that absorbs the first losses is called the:

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Question 28

Structured finance CDOs are collateralized by which assets?

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Question 29

If a mortgage has a balloon payment equal to the original loan principal, it is best described as:

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Question 30

The risk that principal repayments will be slower than expected is known as:

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Question 31

Which of the following is a motivation for issuing a Collateralized Mortgage Obligation (CMO)?

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Question 32

In a CMBS, what is the 'equity tranche' often referred to as?

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Question 33

A 'hard-bullet' covered bond is defined as:

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Question 34

Which of the following describes 'structural subordination'?

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Question 35

What is the weighted average maturity (WAM) of a mortgage pool?

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Question 36

A 'strategic default' occurs when:

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Question 37

In a credit card ABS, what happens if an 'early amortization' trigger is hit?

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Question 38

Synthetic CDOs differ from cash CDOs because the collateral consists of:

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Question 39

For a lender, a loan with a lower Loan-to-Value (LTV) ratio generally implies:

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Question 40

A mortgage that allows the borrower to switch from a fixed rate to an adjustable rate is called:

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Question 41

In a waterfall structure, the 'first-loss' piece is typically held by:

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Question 42

A 'prime' mortgage loan is characterized by:

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Question 43

Which of the following is NOT a benefit of securitization?

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Question 44

A 100 PSA prepayment speed implies that the prepayment rate (CPR):

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Question 45

Which of the following creates a 'flow' of funds to the different tranches in a securitization?

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Question 46

Generally, as the Loan-to-Value (LTV) ratio increases, the probability of default:

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Question 47

In a credit card ABS, the interest rate paid to investors is:

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Question 48

A Collateralized Bond Obligation (CBO) is a type of CDO backed primarily by:

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Question 49

Which form of CMBS call protection requires the borrower to pay a penalty equal to the present value of lost interest cash flows?

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Question 50

The 'average life' of a mortgage-backed security will likely decrease when:

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