CLOs and Leveraged Loans: How Structured Credit Really Works | HL Hunt
CLOs and Leveraged Loans: How Structured Credit Really Works
Collateralized loan obligations are the largest buyer of leveraged loans on earth — a $1.3 trillion machine that turns risky corporate debt into AAA-rated paper. Understanding the tranching, the waterfall, and the coverage tests explains both why the structure is resilient and where it fractures.
Contents
1. What a CLO actually is
A collateralized loan obligation is a special-purpose vehicle that buys a diversified portfolio of senior secured corporate loans — typically 150 to 300 separate loans — and funds those purchases by issuing its own debt and equity in a layered capital structure. The interest and principal paid by the underlying borrowers flows up through that structure according to a strict set of rules. The CLO is, in essence, a leveraged bond fund wearing a securitization wrapper.
The economic purpose is straightforward: the loans pay a blended yield of, say, SOFR + 375 basis points, while the CLO's own liabilities cost a blended SOFR + 200. That spread — the difference between what the assets earn and what the liabilities cost — accrues to the equity holders at the bottom of the stack, amplified by leverage of roughly 10:1. CLOs are arbitrage vehicles in the precise sense that they monetize a funding-cost differential.
2. The leveraged loan collateral
The raw material is the broadly syndicated leveraged loan: floating-rate, senior secured debt issued by sub-investment-grade companies, usually to finance leveraged buyouts, acquisitions, or dividend recapitalizations. These loans sit at the top of the borrower's capital structure, secured by a first lien on assets, which historically has produced recovery rates around 60–70 cents on the dollar versus 40 cents for unsecured bonds.
Two features make these loans ideal CLO collateral. First, they float over SOFR, so the CLO's assets and liabilities both reprice with rates — the structure carries little duration risk. Second, they trade in a liquid secondary market, letting managers actively buy and sell to manage credit and satisfy portfolio tests.
The covenant-lite reality
Over 90% of new leveraged loans are now "cov-lite" — they lack the maintenance covenants that once forced borrowers to the table early when performance slipped. This pushes problems later into the cycle and tends to compress recoveries when defaults finally arrive, because the company has had more time to deteriorate before lenders can act.
3. Tranching and the capital stack
The CLO issues a series of notes, each with a different claim priority and credit rating. A representative structure on a $500 million CLO looks like this:
| Tranche | Rating | % of deal | Spread (over SOFR) |
|---|---|---|---|
| Class A | AAA | 62% | +150 bps |
| Class B | AA | 11% | +200 bps |
| Class C | A | 6% | +260 bps |
| Class D | BBB | 6% | +360 bps |
| Class E | BB | 5% | +675 bps |
| Equity | Not rated | 10% | Residual |
The magic of tranching is subordination. The AAA tranche can be rated AAA even though every loan in the pool is junk-rated, because the 38% of the structure beneath it absorbs losses first. For the AAA to take a single dollar of loss, the portfolio would have to lose more than 38% of its value after recoveries — an event that has essentially never happened to a broadly syndicated CLO, including through 2008.
4. The cash flow waterfall
Cash arriving from the loans is distributed top-down through the "waterfall." Interest proceeds pay senior fees, then Class A interest, then Class B, and so on down to equity. Principal proceeds follow a parallel waterfall. The governing principle is absolute priority: no junior tranche receives a dollar until every senior claim above it has been satisfied in full.
5. OC and IC coverage tests
The protective heart of a CLO is its coverage tests. The overcollateralization (OC) test checks that the par value of the collateral sufficiently exceeds the balance of a given tranche. The interest coverage (IC) test checks that interest income covers interest owed on the senior notes.
This is the self-healing mechanism. When loans default or are downgraded heavily, the OC ratio falls. If it breaches the trigger, the waterfall automatically shuts off distributions to the equity and junior debt and uses that cash to amortize the senior notes — deleveraging the structure precisely when credit is deteriorating. The equity holder is the shock absorber; the AAA holder is protected by design.
6. The equity arbitrage
CLO equity is the residual claim — it receives whatever is left after every debt tranche is paid. In benign credit conditions, that residual is large: the equity earns the levered spread between asset yields and liability costs, often producing cash-on-cash distributions of 12–18% annually in the early years. The trade-off is that the equity absorbs the first losses and sees its distributions cut off the moment coverage tests fail.
CLO equity is a leveraged bet on the credit cycle: it harvests the spread in good times and is the first to bleed when defaults rise.
7. The role of the CLO manager
Unlike a static securitization, a CLO is actively managed during its reinvestment period (typically the first 4–5 years). The manager can sell deteriorating credits before they default, buy new loans with principal proceeds, and trade to keep the portfolio within its tests. A skilled manager who trims a name before it craters preserves par and protects the OC tests; a passive or unlucky manager lets losses crystallize. Manager selection is therefore a meaningful driver of equity returns and explains the persistent tiering in CLO liability spreads between top-tier and second-tier managers.
8. What happens in a default cycle
When the credit cycle turns, defaults rise and downgrades accelerate. CLOs feel this through two channels. First, actual defaults reduce collateral par and pressure the OC tests. Second — and often sooner — a wave of downgrades into CCC matters, because CLOs cap the share of CCC-rated assets they can hold at par (usually 7.5%). Excess CCC holdings get carried at market value in the OC test, which can mark down the numerator sharply and trip the test even before defaults materialize.
The 2020 COVID shock was a live stress test: CCC buckets ballooned, many mezzanine and equity distributions were temporarily diverted, and a number of deals failed OC tests. Yet the senior tranches paid in full, the diversion mechanism worked as designed, and most structures recovered as the rebound arrived. No CLO 1.0 or 2.0 AAA tranche has ever defaulted.
9. CLOs vs. the CDOs of 2008
CLOs are routinely confused with the CDOs that detonated in 2008, but they are structurally different animals:
| Feature | 2008 CDOs | CLOs |
|---|---|---|
| Collateral | Subprime mortgage tranches / CDS | Senior secured corporate loans |
| Correlation | Extreme (one housing market) | Diversified across sectors |
| Re-securitization | CDO-squared common | Rare; loans are the collateral |
| Recovery rates | Very low on subprime | ~60–70% on first-lien loans |
| AAA default history | Significant losses | Zero |
The critical distinction is correlation. The 2008 CDOs held thousands of mortgages that all depended on a single national housing market — when it fell, diversification evaporated and "diversified" pools defaulted together. A CLO's loans span dozens of industries with idiosyncratic default drivers, so the diversification is real. That does not make CLOs riskless, but it makes the AAA rating defensible in a way the synthetic mortgage CDOs never were.
Key takeaways
- A CLO is a leveraged, actively managed portfolio of senior secured loans funded by a tranched capital stack.
- Subordination — not collateral quality — is what allows junk loans to back AAA notes.
- OC/IC coverage tests automatically deleverage the structure in a downturn, protecting senior holders at the equity's expense.
- CLO equity is a levered play on the credit cycle: rich carry in good times, first losses in bad.
- CLOs are structurally distinct from 2008 CDOs, chiefly because their collateral is diversified and genuinely senior secured.
HL Hunt Research is published for educational purposes and does not constitute investment advice.