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Collateralized debt obligation Meaning

A collateralized debt obligation (CDO) is a structured financial product that bundles together many individual debt instruments-such as mortgages, corporate loans, auto loans, credit card receivables, or other fixed-income assets-into a single pool, then repackages the pool into “slices” (called tranches) that can be sold to investors. Each tranche has a different risk/return profile.

Senior tranches typically receive payments first and are considered lower risk (with lower yields), while junior or equity tranches absorb losses first and offer higher potential returns. This structure aims to match different investor appetites-pension funds and insurers might prefer senior tranches, while hedge funds may take more junior exposure.

CDOs are usually created by large financial institutions using securitization: the bank or arranger purchases (or originates) a portfolio of loans, transfers them into a special purpose vehicle (SPV), and then issues securities backed by the cash flows from those underlying debts. Rating agencies may assign different credit ratings to tranches based on expected default rates and loss absorption.

CDOs became widely associated with the 2007-2008 financial crisis because many structures were heavily exposed to subprime mortgage risk, and because diversification assumptions and tranche models did not hold up under correlated stress. While securitization still exists in modern markets, post-crisis regulation and risk practices significantly reduced and reshaped the most aggressive CDO-era structures.

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