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FRM Exam Part II · An Introduction to Securitisation

Securitisation Structure, SPV and Key Participants

Updated 11 October 2026 · Fact-checked

Securitisation pools loans and sells them to a bankruptcy-remote special purpose vehicle (SPV). The SPV issues tranched securities to investors. The servicer collects payments, the trustee protects investors, and rating agencies rate the tranches. Cash flows pass through a waterfall: senior tranches are paid first, and losses hit the equity tranche first.

Understand Securitisation Structure and Key Participants

Securitisation turns a pool of illiquid loans, such as mortgages or auto loans, into tradable securities. The bank that made the loans is the originator. It sells the pool to a separate legal entity, the special purpose vehicle (SPV). The SPV funds the purchase by issuing notes to investors.

The SPV is bankruptcy-remote. If the originator fails, creditors cannot claim the pool. If the pool performs badly, investors cannot claim the originator's other assets. This only works if the sale is a true sale. In a true sale, the assets legally leave the originator's balance sheet. In a synthetic securitisation, the assets stay with the originator. Only the credit risk moves, usually through credit default swaps or guarantees. The SPV then holds collateral and sells credit protection.

Other participants have defined jobs. The servicer collects payments from borrowers, handles arrears and passes cash to the SPV. The trustee acts for noteholders, holds the assets, checks that the servicer and the SPV follow the deal documents, and distributes cash. Rating agencies assess the credit quality of each tranche and set the credit enhancement needed for a given rating. Arrangers structure the deal and underwriters place the notes.

The cash flow waterfall is the payment order set in the documents. Cash collected from the pool pays fees and expenses first, then interest on the senior tranche, then interest on mezzanine tranches, then principal in order of seniority. What is left goes to the equity (first-loss) tranche. Losses run the other way: equity absorbs them first, then mezzanine, then senior. This ordering is subordination.

Risk comes from the links between parties. The originator may have weak incentives to screen loans if it sells them on (the originate-to-distribute problem). The servicer's quality affects recoveries. Ratings rely on models and assumptions, such as default correlation. Know who does what and who bears which risk.

Key formulas to remember

Waterfall priority (cash)
Fees and expenses → senior interest → mezzanine interest → principal by seniority → equity residual
Exact order depends on the deal documents. Sequential and pro-rata principal payment both exist; read the question.
Loss allocation (losses)
Equity first → mezzanine → senior
Losses are the reverse of the payment order. A tranche loses only when losses exceed the subordination below it.
Subordination (credit enhancement) for a tranche
Subordination = sum of the sizes of all tranches junior to it ÷ total pool balance
Example: ₹ pool of 100 with junior tranches totalling 15 gives 15% subordination to the senior tranche.
Tranche loss
Tranche loss = min(tranche size, max(0, pool loss − attachment point)) in pool-balance terms
Attachment point is the total size of tranches below. Detachment point = attachment point + tranche size.
Excess spread
Excess spread = pool interest income − (note interest + fees and expenses)
Excess spread is available to cover losses. Any remainder can be released to the equity holder or trapped in the SPV.

How to solve Securitisation Structure and Key Participants questions

Use the same sequence for any structure question. It keeps roles and cash flows separate.

  1. 1Identify the deal type: true sale (assets move to the SPV) or synthetic (only risk moves, via CDS or guarantees).
  2. 2List the parties in the question and match each to its role: originator, SPV, servicer, trustee, rating agency, investors.
  3. 3Find the tranche sizes from the most senior down to equity, and compute attachment and detachment points.
  4. 4For a cash question, apply the waterfall top-down. Pay each claim in full before moving to the next.
  5. 5For a loss question, apply losses bottom-up. Subtract each tranche's size until the loss is used up.
  6. 6Check the risk effect: who keeps the risk, who has incentives that may misalign, and does the originator get capital relief.
  7. 7Re-read the question for traps such as sequential versus pro-rata, or retained first-loss pieces.

Quickest way: Role match plus bottom-up losses

When to use it: Use when the question offers four statements about roles or asks which tranche takes a given loss.

  1. Strike options that give a party the wrong job. Servicer collects, trustee protects investors, SPV holds assets and issues notes, agencies rate.
  2. For a loss number, write tranche sizes as a stack with equity at the bottom. Subtract from the bottom until the loss runs out.
  3. For a true sale versus synthetic choice, ask: do the assets legally leave the balance sheet? If not, it is synthetic.

Common mistakes in Securitisation Structure and Key Participants

  • Assuming that because the originator may consolidate the SPV for accounting purposes, the originator is always liable for the pool's losses.

    Students confuse accounting consolidation with legal separation.

    Fix: Remember the point of the SPV is legal isolation. An SPV may be consolidated for accounting purposes but remains legally separate. In a true sale, investors have recourse to the pool, not to the originator's other assets. So the originator is not liable for the pool's losses beyond any retained or contractual exposure. That exposure can be real. A retained first-loss piece, or other contractual support such as representations and warranties or implicit support, does expose the originator to losses.

  • Treating synthetic securitisation as moving the loans to an SPV.

    Both use an SPV and tranches, so they look alike.

    Fix: In synthetic deals the loans stay on the originator's balance sheet. Credit risk is transferred by credit derivatives or guarantees.

  • Allocating losses top-down, hitting the senior tranche first.

    The waterfall for cash pays senior first, so students apply the same order to losses.

    Fix: Cash goes top-down. Losses go bottom-up. Draw the stack before computing.

  • Giving the trustee the servicer's job, or the reverse.

    Both are administrative roles and both handle cash.

    Fix: Servicer deals with borrowers and collections. Trustee represents investors and oversees compliance with the documents.

  • Assuming a rating agency guarantees tranche performance.

    A high rating feels like an assurance.

    Fix: A rating is an opinion on credit risk based on models and assumptions. It does not remove model risk or protect against correlation errors.

  • Ignoring excess spread and fees when running the waterfall.

    Students start at senior interest.

    Fix: Senior fees and expenses are paid first. Excess spread, if any, can absorb losses before the equity tranche is hit.

Worked examples

Example 1

A securitisation SPV holds a loan pool of USD 200 million. It issues a senior tranche of USD 160 million, a mezzanine tranche of USD 30 million and an equity tranche of USD 10 million. Pool losses are USD 24 million. Ignore excess spread. What loss does the mezzanine tranche suffer, and what is the senior tranche's subordination?

Show the solution
  1. Stack from the bottom: equity USD 10 million, mezzanine USD 30 million, senior USD 160 million.
  2. Apply losses bottom-up. Equity absorbs the first USD 10 million. It is wiped out.
  3. Remaining loss = 24 − 10 = USD 14 million.
  4. Mezzanine attachment point is 10 and detachment point is 40. Loss to mezzanine = min(30, 24 − 10) = USD 14 million.
  5. Senior tranche loses nothing because losses of 24 are below its attachment point of 40.
  6. Senior subordination = (30 + 10) ÷ 200 = 20%.

Answer: Mezzanine loses USD 14 million (about 46.7% of its size). Senior subordination is 20%, and the senior tranche takes no loss.

Example 2

A bank wants capital relief on a EUR 500 million corporate loan book but must keep the loans on its balance sheet for client relationship reasons. It buys credit protection on a mezzanine slice of the portfolio from investors through an SPV that issues credit-linked notes. Is this a true sale or a synthetic securitisation, and who bears the credit risk on the protected slice?

Show the solution
  1. Test where the loans sit. The bank keeps the loans on its balance sheet, so there is no legal transfer of assets.
  2. Test how risk moves. The bank buys protection from the SPV through a credit derivative, and the SPV funds itself by issuing credit-linked notes to investors. Only credit risk is transferred.
  3. This matches the definition of a synthetic securitisation.
  4. The SPV issues notes and holds the investors' cash as collateral. If losses hit the protected slice, the SPV pays the bank from that collateral, and the note investors take the loss.
  5. Credit-linked notes make the protection funded, because the investors' cash is already in the SPV as collateral. This greatly reduces the bank's counterparty risk on the protection. Some risk remains from the credit quality of the collateral the SPV holds and from the structure itself. Counterparty risk arises mainly when protection is unfunded, such as a CDS with no collateral behind it.
  6. The bank still bears the risk on the unprotected slices.

Answer: It is a synthetic securitisation. The note investors bear the credit loss on the protected mezzanine slice. Because the protection is funded through credit-linked notes with cash collateral in the SPV, the bank's counterparty risk is greatly reduced, though residual risk remains from the collateral's quality and the structure. The bank keeps the assets and the risk on unprotected slices.

Exam tips

  • Expect applied questions on who does what. Learn one-line roles for originator, SPV, servicer, trustee and rating agency, and use elimination.
  • Always draw the tranche stack before any loss or cash calculation. Cash flows down, losses come up.
  • Be able to state true sale versus synthetic in one sentence each, including where the assets sit and how risk moves.
  • Watch for incentive questions. Originate-to-distribute weakens screening, and the answer often links to retention of a first-loss piece.
  • Read for sequential versus pro-rata principal and for any excess spread before you calculate.

Practice questions from An Introduction to Securitisation

Securitisation Structure and Key Participants: frequently asked questions

What does a special purpose vehicle do in securitisation?

The SPV buys the asset pool from the originator and issues securities to investors. It is set up to be bankruptcy-remote, so the pool is legally separate from the originator. This lets investors price the pool's credit risk rather than the originator's.

What is the difference between a true sale and a synthetic securitisation?

In a true sale, the assets are legally transferred to the SPV and leave the originator's balance sheet. In a synthetic securitisation, the assets stay with the originator and only credit risk is transferred, typically through credit default swaps or guarantees.

What is the cash flow waterfall in securitisation?

It is the payment order set in the deal documents. Cash from the pool pays fees, then senior interest, then junior interest, then principal by seniority. Any residual goes to the equity tranche. Losses are absorbed in the opposite order.

What is the role of the servicer versus the trustee?

The servicer collects payments from borrowers, manages arrears and recoveries, and passes cash to the SPV. The trustee acts for investors, holds the assets and monitors compliance with the deal terms.