Glossary/Fixed income

Collateralized Loan Obligation

Also known as CLO

A collateralized loan obligation is a securitization that owns a diversified pool of mainly leveraged corporate loans and issues tranches with different priorities for income and principal.

Editorially reviewed 2026-07-30

Why collateralized loan obligation matters

CLOs channel capital to corporate borrowers and let investors select different combinations of yield and loss protection. Outcomes depend on collateral, manager decisions, structure, and market conditions.

How it is applied

Analysis covers loan quality, diversification, defaults, recoveries, reinvestment period, manager record, liability costs, coverage tests, trading limits, waterfall, and scenario cash flows by tranche. CLO analysis models the loan portfolio, manager behavior, liabilities, payment waterfall, coverage tests, reinvestment period, and optional redemption. Scenarios vary defaults, recoveries, spreads, prepayments, and trading losses. Investors assess both expected cash flow and the point at which tests redirect payments away from junior tranches.

Portfolio example

Loan losses first reduce the CLO equity tranche. If deterioration causes an overcollateralization test to fail, cash that would have gone to junior holders is redirected toward senior debt. A CLO owns 500 million of loans and finances them with 450 million of rated debt plus 50 million of equity. If collateral losses and haircuts reduce test values, excess interest that formerly reached equity may instead repay senior notes until coverage improves.

How to interpret it

Senior tranches have more subordination and usually lower yield. Equity receives residual cash and bears first loss. A tranche rating does not describe mark-to-market volatility or liquidity. Senior CLO debt has substantial subordination beneath it, while equity receives residual cash and bears first loss. A high current equity distribution can include compensation for future defaults and may fall abruptly after test failure. Manager quality matters because collateral can be traded within constraints.

Limitations and common misconceptions

Default correlation, recovery assumptions, manager trading, documentation, and refinancing affect results. Model outputs can be highly sensitive, while forced sales and market illiquidity can amplify stress. Models are sensitive to correlated defaults, recovery timing, loan prices, reinvestment opportunities, and documentation. Tranches can become illiquid during stress even without principal impairment. Ratings do not measure market-price volatility, and historical performance may not represent a different credit cycle. Liability refinancing and reset assumptions also affect equity returns. Reports should distinguish cash distributions from changes in the market value of the retained position.

Sources and further reading