A loan pool can keep receiving cash while its equity investors receive nothing. The payment rules, collateral tests and loss priorities determine who gets each dollar.
Securitization finances a pool of assets by issuing securities backed by their cash flows. An originator creates loans or receivables. A sponsor selects the pool and arranges financing. Assets are transferred to a bankruptcy-remote special purpose vehicle (SPV), subject to the deal's legal structure. The vehicle issues claims to investors. The transfer and servicing arrangements determine whether the pool can continue operating if the originator fails.
The servicer collects payments, follows delinquencies and administers recoveries. A trustee or custodian holds assets, checks the contractual tests and distributes cash. Underwriters place the securities; rating agencies assess specified credit risks; guarantors or liquidity providers may support selected obligations. One institution can perform several roles, so assess the incentives as well as the labels.
Origination fees can reward loan volume even when quality deteriorates. A servicer may prefer actions that preserve its fees while delaying recognition of losses.
Common mistakes
- Applying a tranche function to average pool loss. The three-state example has 5% mean pool loss but 16% expected loss on the 5% to 15% tranche. Nonlinear losses must be calculated state by state.
- Reversing correlation exposure. Holding marginal default assumptions fixed, the funded senior investor is generally short correlation and the equity investor long correlation. Protection buyers take the opposite positions.
- Releasing all excess spread to equity. Year one's $3.5M surplus entirely replenishes the OC account. Equity receives zero because the target applies before release.
Bottom line
- Securitization links origination, asset transfer, servicing, issuance and contractual cash distribution.
- Tranches redistribute losses through attachment and detachment; expected tranche loss requires state-by-state allocation.
- Excess spread, subordination, OC, reserves and guarantees provide different forms of support.
- Test conditions govern equity release, and reserve balances must carry forward between payment dates.
Exam shortcut
Draw the loss bands before applying a pool-loss percentage. For cash flows, list fees, coupons, principal priorities, support deposits and residual payments in the order stated. For each period, carry forward balances and reconcile every dollar. Keep three separate denominators visible: original pool principal, current tranche principal and current collateral eligible under a test. For prepayments, identify the pool's age, PSA multiple and post-scheduled-principal balance before calculating cash.
The full lesson (about 5,956 words, 40 min read) adds 3 worked examples, all 6 common mistakes, a self-check, free in the app.
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