Securitization is the financial practice of pooling various types of contractual debt such as residential mortgages, commercial mortgages, auto loans or credit card debt obligations and selling said consolidated debt as bonds, pass-through securities, or Collateralized mortgage obligation (CMOs), to various investors. The principal and interest on the debt, underlying the security, is paid back to the various investors regularly. Securities backed by mortgage receivables are called mortgage-backed securities (MBS), while those backed by other types of receivables are asset-backed securities (ABS).

Critics have suggested that the complexity inherent in securitization can limit investors' ability to monitor risk, and that competitive securitization markets with multiple securitizers may be particularly prone to sharp declines in underwriting standards. Private, competitive mortgage securitization is believed to have played an important role in the U.S. subprime mortgage crisis.

In addition, off-balance sheet treatment for securitizations coupled with guarantees from the issuer can hide the extent of leverage of the securitizing firm, thereby facilitating risky capital structures and leading to an under-pricing of credit risk. Off-balance sheet securitizations are believed to have played a large role in the high leverage level of U.S. financial institutions before the financial crisis, and the need for bailouts.

The granularity of pools of securitized assets is a mitigant to the credit risk of individual borrowers. Unlike general corporate debt, the credit quality of securitised debt is non-stationary due to changes in volatility that are time- and structure-dependent. If the transaction is properly structured and the pool performs as expected, the credit risk of all tranches of structured debt improves; if improperly structured, the affected tranches may experience dramatic credit deterioration and loss.

Securitization has evolved from its tentative beginnings in the late 1970s to an estimated outstanding of $10.24 trillion in the United States and $2.25 trillion in Europe as of the 2nd quarter of 2008. In 2007, ABS issuance amounted to $3.455 trillion in the US and $652 billion in Europe. WBS (Whole Business Securitization) arrangements first appeared in the United Kingdom in the 1990s, and became common in various Commonwealth legal systems where senior creditors of an insolvent business effectively gain the right to control the company.

Read more about Securitization:  History, Recent Lawsuits

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