lev-os Conducting Structured Finance Surveillance
When To Use
- Periodic (monthly/quarterly) monitoring of ABS, MBS, CLO, or CDO performance against origination assumptions
- Evaluating whether collateral pool deterioration is approaching or breaching indenture triggers
- Tracking overcollateralization (OC) and interest coverage (IC) test compliance across tranches
- Assessing credit migration within a collateral pool (upgrades, downgrades, defaults, recovery rates)
- Preparing surveillance summaries for portfolio managers, rating agencies, or risk committees
- Responding to market stress events that may accelerate structured product deterioration
Inputs To Gather
- Trustee reports — most recent and prior periods for trend analysis (remittance reports, monthly servicer reports)
- Deal documents — indenture/pooling and servicing agreement (PSA) with trigger definitions, waterfall priority, and event-of-default thresholds
- Collateral tape — loan-level or asset-level data with current balances, delinquency status, credit ratings, and loss severity
- Coverage test levels — current OC and IC ratios versus trigger thresholds for each tranche
- Rating agency actions — recent rating changes on underlying collateral or tranche ratings
- Market data — relevant index spreads (e.g., CLOIE, ABX), discount margins, and comparable deal pricing
- Historical performance data — vintage curves for delinquency, default, prepayment (CPR/CDR/severity)
Workflow
Establish surveillance baseline
- Confirm deal structure: tranche stack, subordination levels, credit enhancement mechanisms (excess spread, reserve accounts, OC)
- Map trigger definitions from the indenture — identify OC/IC trigger levels, reinvestment period end date, and event-of-default thresholds
- Note any structural features: turbo amortization, payment-in-kind toggles, ramp-up provisions (CLOs), clean-up call thresholds
Analyze collateral pool performance
- Calculate period-over-period changes in pool factor, weighted average coupon (WAC), weighted average life (WAL), and weighted average rating factor (WARF)
- Stratify delinquency buckets (30/60/90+ DPD) and compare to prior periods and original expectations
- For CLOs: assess CCC-bucket concentration (typically >7.5% triggers OC haircut), identify assets trading below par, flag defaulted or credit-risk obligations [VERIFY: specific CCC threshold per deal indenture]
- For ABS/MBS: track cumulative net loss (CNL) against vintage loss curves and original rating agency base/stress scenarios
- Compute constant default rate (CDR), constant prepayment rate (CPR), and loss severity trends
Run coverage test compliance
- Calculate current OC ratio: (collateral par or market value) / (tranche par outstanding) for each trigger level
- Calculate current IC ratio: (interest collections) / (interest due on covered tranches)
- Compare to trigger thresholds — flag any breach or cushion below 50 bps of trigger
- If triggers are breached: trace waterfall consequences (diversion of interest proceeds, accelerated principal paydown to senior tranches, cessation of reinvestment)
- Track cure trajectory — is the breach worsening, stable, or recovering?
Assess credit migration
- Tally rating upgrades vs. downgrades in the collateral pool since last review
- Compute WARF drift and compare to maximum permitted WARF [VERIFY: deal-specific WARF covenant]
- Identify sector or obligor concentration shifts — flag single-obligor or single-industry exposure exceeding indenture limits
- For CLOs: review trading activity (purchases/sales) and assess whether the collateral manager is defensively rotating or reaching for yield
Evaluate structural protections
- Assess remaining credit enhancement as a percentage of current pool balance
- Calculate excess spread trends — declining excess spread is an early warning signal
- Review reserve account balances relative to required levels
- For amortizing deals: check whether paydown priority has shifted (sequential vs. pro-rata) due to trigger events
Compile surveillance output
- Produce a structured surveillance summary (see Output section)
- Flag any action items: watchlist additions, trigger breaches requiring escalation, recommended position changes
- Compare current performance to original underwriting thesis — note where assumptions have diverged materially
Output
The surveillance report should include:
- Deal summary header — deal name, asset class, originator/manager, closing date, current pool factor
- Coverage test dashboard — table showing each tranche's OC/IC ratio, trigger level, cushion, and pass/fail status
- Collateral performance snapshot — delinquency stratification, CDR/CPR/severity, WARF, CCC bucket %, and period-over-period trends
- Credit migration table — count and notional of upgrades, downgrades, defaults, and recoveries since last report
- Trigger watch section — any tests within 100 bps of breach, with projected trajectory under base and stress scenarios
- Structural commentary — credit enhancement adequacy, excess spread trend, waterfall implications of any current trigger breaches
- Action items and recommendations — watchlist changes, escalation flags, suggested portfolio actions (hold/reduce/exit)
Quality Checks
- Verify that OC/IC calculations match the trustee report — reconcile any discrepancies before publishing
- Confirm trigger thresholds are sourced from the actual indenture, not from memory or generic assumptions [VERIFY]
- Validate that collateral tape totals (par balance, number of assets) tie to the trustee report
- Cross-check WARF calculations using the applicable rating agency methodology (Moody's vs. S&P vs. Fitch scales differ) [VERIFY: which agency methodology governs per indenture]
- Ensure delinquency and default definitions match the PSA/indenture (e.g., payment default vs. bankruptcy default vs. distressed exchange)
- Flag any data gaps — missing servicer reports, stale collateral tapes, or unrated assets — rather than assuming values
- Confirm that all period-over-period comparisons use consistent reporting dates and methodologies