collateralized mortgage obligation

collateralized mortgage obligation
Name	collateralized mortgage obligation
Type	Asset-backed security
Introduced	1980s
Issuer	Salomon Brothers, Goldman Sachs, Lehman Brothers
Underlying	Mortgage loans, mortgage-backed securities
Currency	United States dollar
Regulatory authority	Securities and Exchange Commission, Federal Reserve System

collateralized mortgage obligation is a type of mortgage-backed asset created by pooling mortgage loans and issuing multiple classes of claims that prioritize cash flows and credit exposure. Developed in the 1980s to address investor demand for predictable maturity and credit segmentation, CMOs were widely issued by investment banks and sponsored by government-related entities. They played a central role in the expansion of the securitization market and became prominent in discussions involving housing market cycles, major financial institutions, and regulatory reform.

Overview

CMOs convert pools of residential mortgages into structured securities by creating sequential and concurrent payment priorities that appeal to diverse investors such as pension funds, insurance companys, and mutual funds. Originators including Freddie Mac, Fannie Mae, Ginnie Mae, and private issuers like Salomon Brothers packaged collateral to distribute interest-rate and prepayment exposures across tranches. CMOs intersect with other instruments and markets involving Treasury bonds, corporate bonds, and asset-backed securitys, and were influential in episodes involving Federal Reserve System policy, subprime mortgage expansion, and credit rating agency actions.

Structure and Tranching

A CMO issue is divided into tranches such as sequential pay, accrual, and planned amortization classes issued by banks including Goldman Sachs and Morgan Stanley. Typical tranche labels (e.g., Class A, Class B) reflect payment priority; some structures incorporate support from credit default swapes or overcollateralization arranged by sponsors like Lehman Brothers. Special purpose vehicles are often domiciled in jurisdictions used by Citigroup and Deutsche Bank for securitization, and servicer rights can be held by firms such as Wells Fargo or JPMorgan Chase. Legal documentation references statutes and rulings involving Internal Revenue Service guidance and decisions from courts like the United States Court of Appeals.

Cash Flow Mechanics and Waterfall

Cash flows from the underlying pool—principal and interest—are distributed per a contractual waterfall to pay senior tranches before subordinate tranches; servicers such as Ocwen Financial or PHH Corporation collect payments and enforce foreclosures according to investor directives. Prepayment behavior influenced by rates set by Federal Reserve System actions, and refinancing incentives tied to indexes like the London Interbank Offered Rate affect the timing and magnitude of tranche returns. Collateral performance can trigger features such as interest diversion, principal deficiency ledgers, and triggers based on tests similar to those in arrangements tied to Credit Suisse and UBS securitizations.

Risk Characteristics and Ratings

CMOs expose tranche-holders to interest-rate risk, prepayment risk, credit risk, and liquidity risk; rating agencies including Moody's Investors Service, Standard & Poor's, and Fitch Ratings granularly rated tranches from investment-grade to speculative-grade. Enhanced structures used subordination, reserve accounts, and third-party guarantees from monoline insurers like American International Group and MBIA to support higher ratings. Historical disputes involved models and assumptions used by agencies and firms such as Bear Stearns and Merrill Lynch during stress events, with notable litigation in federal courts and oversight from the Securities and Exchange Commission.

Market History and Regulation

CMOs were innovated in the 1980s with issuance growth through the 1990s and 2000s driven by capital markets activities at Salomon Brothers, Lehman Brothers, and Goldman Sachs. The 2007–2009 financial crisis highlighted vulnerabilities tied to subprime mortgage collateral and complex tranche incentives, involving events at Lehman Brothers and AIG and prompting responses by United States Department of the Treasury and central banks such as the European Central Bank. Regulatory reforms followed, including legislation and rulemaking involving the Dodd–Frank Wall Street Reform and Consumer Protection Act and oversight enhancements by the Federal Reserve System and the Securities and Exchange Commission.

Valuation and Pricing Methods

Valuation employs discounted cash-flow techniques, option-adjusted spread models, and prepayment modeling using econometric approaches influenced by historical datasets from Federal Housing Finance Agency and proprietary pools maintained by Fannie Mae. Pricing reflects tranche-specific yield, liquidity terms, and credit support calibrated by analytics from firms such as Barclays and Goldman Sachs trading desks. Market practice references benchmarks like U.S. Treasury yields, swap curves, and credit spreads observed in secondary trading venues used by BNP Paribas and HSBC.

Impact on Investors and Financial System

CMOs offered investors targeted exposure to mortgage cash flows, enabling pension funds, sovereign wealth funds, and insurance companys to match liabilities and appetite for yield. Mispricing, model risk, and concentration contributed to systemic strains during the 2007–2009 crisis, affecting institutions including Citigroup, Bear Stearns, and UBS and spurring regulatory and market structure changes. Ongoing debates among policymakers, academics at institutions like Harvard University and Massachusetts Institute of Technology, and industry participants continue regarding disclosure, rating practices, and the role of securitization in housing finance.

Category:Securitization