RMBS — Residential Mortgage-Backed Securities
Residential Mortgage-Backed Securities — Structure, Origination History, the Pre-Crisis Underwriting Failures, Post-Crisis Litigation, and the Current Market
Residential mortgage-backed securities are fixed-income instruments whose cash flows derive from pools of residential mortgage loans. These securities occupy a central position in the U.S. capital markets and represent one of the largest asset classes in the global fixed-income universe. RMBS are issued through securitization structures in which mortgage loans are transferred to a trust or special purpose vehicle, which then issues securities backed by the principal and interest payments made by the underlying borrowers. The market encompasses both agency securities guaranteed by government-sponsored enterprises and non-agency securities backed solely by the credit quality of the underlying collateral and structural protections embedded in the transaction documents. The outstanding universe of pre-crisis non-agency RMBS — concentrated in 22,000 or more CUSIPs and over $800 billion in principal balance from the 2005 to 2007 peak vintage years — continues to amortize and pay down, while the post-crisis new-issue non-agency market has grown from near zero in 2012 to approximately $67 billion in projected 2025 private-label issuance according to KBRA, driven by prime jumbo, non-qualified mortgage, and closed-end second lien collateral. The legacy universe and the new-issue market require fundamentally different analytical frameworks, and distinguishing between them is the foundational skill of RMBS practice.
https://www.spglobal.com/spdji/en/landing/topic/us-non-agency-rmbs/
Corvid Partners maintains recognized expertise in the analysis and valuation of residential mortgage-backed securities across the full spectrum of agency and non-agency structures. Members of the firm have traded, analyzed, and valued RMBS across multiple market cycles, including the rapid expansion of non-agency origination in the early 2000s, the severe dislocations of the 2007-2009 financial crisis, the subsequent period of litigation and loss attribution, and the current environment characterized by legacy portfolio management, regulatory reform, and evolving origination standards. The Barclays acquisition of Lehman Brothers' U.S. broker-dealer operations in September 2008 placed Corvid's principals directly in the center of the post-crisis RMBS market at its most consequential moment — managing legacy mortgage positions across prime, Alt-A, and subprime collateral in markets that had ceased to function, at the moment when the gap between the stated characteristics of the underlying loans and their actual performance was being measured for the first time and the litigation wave that would produce over $60 billion in DOJ and regulatory settlements was beginning to form.
The Agency RMBS Market — Ginnie Mae, Fannie Mae, Freddie Mac, and the Government Guarantee
The agency RMBS market is dominated by securities issued or guaranteed by three government-related entities: the Government National Mortgage Association (Ginnie Mae), the Federal National Mortgage Association (Fannie Mae), and the Federal Home Loan Mortgage Corporation (Freddie Mac). Ginnie Mae securities carry the explicit full faith and credit guarantee of the United States and are backed by pools of loans insured by the Federal Housing Administration, the Department of Veterans Affairs, and the Department of Agriculture's Rural Housing Service. Fannie Mae and Freddie Mac are government-sponsored enterprises that guarantee timely payment of principal and interest on the securities they issue. The GSEs operate under the conservatorship of the Federal Housing Finance Agency, which has supervised these entities since their September 6, 2008 placement into conservatorship — an action that injected a combined $187.5 billion in Treasury support, stabilized a $5.3 trillion outstanding MBS and debt market equivalent to the entire publicly held debt of the United States at that time, and converted the GSEs' previously implicit government guarantee into an explicit one backed by Treasury Senior Preferred Stock Purchase Agreements. The full mechanics of the conservatorship, credit risk transfer programs, and current agency market statistics are addressed in the MBS umbrella chapter of this guide.
The Non-Agency RMBS Market — Origins and the Pre-Crisis Expansion
Non-agency RMBS, also referred to as private-label securities, are issued without a government or GSE guarantee and are backed by residential mortgage loans that may not conform to GSE eligibility requirements due to loan size, borrower credit profile, documentation standards, or property type. The non-agency market expanded rapidly during the early and mid-2000s, driven by the growth of subprime, Alt-A, and jumbo mortgage origination and strong investor demand for securitized exposure to these loan types. These securities were typically structured as multi-tranche transactions with credit enhancement provided through subordination, excess spread, overcollateralization, and in some cases monoline insurance wraps. The origination practices, underwriting standards, and disclosure deficiencies associated with this expansion became central subjects of inquiry by the Financial Crisis Inquiry Commission and multiple federal enforcement actions.
https://fcic.law.stanford.edu/report
The pre-crisis non-agency market was organized around named securitization shelves — registered programs under which originators and dealers could repeatedly issue securities backed by newly originated mortgage pools without the cost and delay of a full registration each time. Countrywide Financial's CWL shelf was the most prolific subprime securitization vehicle in the market, reflecting its position as by far the largest subprime originator with a 25 percent share of total new U.S. residential mortgage originations in 2006 and at least $97.2 billion in subprime loan originations between 2005 and 2007. IndyMac Bancorp's INDX shelf was one of the largest Alt-A securitization programs, issuing billions in securities backed by reduced-documentation and stated-income loans underwritten by Goldman Sachs and later by Lehman Brothers. Washington Mutual's WMALT shelf issued securities backed by Alt-A loans through the nation's largest savings institution, whose failure in September 2008 became the largest bank failure in U.S. history. Bear Stearns' BSABS shelf was one of the most active subprime conduit programs on Wall Street before the firm's collapse in March 2008. Between 2000 and 2007, Wall Street collectively underwrote approximately $2.1 trillion in subprime mortgage-backed securities, with Lehman Brothers ($106 billion), RBS Greenwich Capital ($99 billion), and Countrywide Securities ($74.5 billion) as the top underwriters in the peak 2005 and 2006 years.
https://en.wikipedia.org/wiki/Subprime_mortgage_crisis
The Underwriting Failures of the 2005 to 2007 Vintage Years
The underwriting deterioration that produced the crisis collateral in the 2005 to 2007 vintage years was systematic, documented, and the direct result of incentive structures that rewarded origination volume over long-term loan performance. Understanding the specific product types that characterized these vintages is essential to evaluating legacy non-agency RMBS, because the nature of the underwriting failure determines the default profile of the collateral and the range of recovery scenarios.
The 2/28 adjustable-rate mortgage was the most common subprime product structure. These loans carried a fixed teaser rate for the first two years — typically well below the fully-indexed rate — and then reset to a floating rate based on LIBOR for the remaining 28 years. By the early 2000s, nearly one-third of all ARMs carried initial teaser rates below 4 percent. When the introductory period ended, monthly payments could double or triple, producing what regulators called payment shock — a sudden increase in required payments that many borrowers had not been underwritten to sustain. The payment option ARM was the most aggressive variant: it allowed borrowers to choose among four payment options each month, including a minimum payment that did not cover accruing interest, leading to negative amortization — the principal balance actually growing over time as unpaid interest was added to the outstanding loan amount. Nearly one in ten mortgage borrowers in 2005 and 2006 took out payment option ARM loans. As of 2007, 40 percent of all subprime loans resulted from automated underwriting systems that approved loans without appropriate review and documentation.
https://en.wikipedia.org/wiki/Subprime_mortgage_crisis
https://www.federalreserve.gov/boarddocs/srletters/2007/sr0712.htm
The documentation degradation across this period created a parallel hierarchy of product types, each representing a lower level of income and asset verification than the one before it. The stated income, verified assets loan — known as SIVA — required lenders to verify the borrower's assets but permitted the income to be stated without documentation. The no income, verified assets loan — NIVA — went further, requiring neither income documentation nor employment verification. The most irresponsible was the no income, no job, no assets loan — NINJA — which required only that the borrower meet a minimum credit score threshold with no independent verification of income, employment, or assets whatsoever. Approximately 70 percent of applications for these loans were estimated to contain false information, typically misstatements about income or fabricated income documents that went undetected in the rush to close loans and securitize them. The simultaneous second lien — a second mortgage originated at closing in lieu of a down payment — allowed borrowers to purchase homes with zero equity at origination, eliminating the buffer that had historically protected lenders against even modest declines in property values. Risk layering — the combination of a stated-income loan, a simultaneous second lien, a high-LTV first mortgage, and an ARM with a low teaser rate — was widespread in the 2006 and 2007 vintage years and represented the most dangerous form of origination abuse because each additional risk compounded the others.
https://predatorylending.duke.edu/business-analysis/evolution-of-mortgage-lending/subprime-lending/
At the desk level, the consequence of these underwriting failures is visible in the S&P index family for U.S. non-agency RMBS, which tracks approximately 350 senior bonds from the 22,000-plus CUSIP universe of 2005 to 2007 vintage securities across four sub-index categories — Prime, Sub-Prime, Alt-A, and Option ARM — with different default and recovery profiles that reflect the nature of the origination failure in each product type. The Option ARM sub-index represents the most severe category: these loans were underwritten to minimum payments that produced negative amortization, meaning that their stated loan-to-value ratios at origination were misleading because the actual balance owed was growing rather than declining even in years when no payment shock had yet occurred.
https://www.spglobal.com/spdji/en/landing/topic/us-non-agency-rmbs/
Structural Mechanics — The Waterfall, Triggers, Shifting Interest, and Step-Down
The structural mechanics of an RMBS transaction involve the transfer of mortgage loans from an originator or aggregator to a bankruptcy-remote special purpose vehicle, which issues multiple classes of securities with varying priority of payment, coupon structures, and credit enhancement levels. Cash flows from the underlying mortgage pool, consisting of scheduled principal and interest, prepayments, and recoveries on defaulted loans, are allocated through a waterfall defined in the transaction documents. Senior tranches receive priority of payment and are protected by subordinate tranches that absorb losses in reverse order of seniority. The complexity of these waterfalls, particularly in non-agency transactions involving triggers, step-down provisions, and shifting interest mechanisms, requires detailed structural analysis to evaluate the distribution of cash flows under varying performance scenarios.
In the first years following issuance, shifting-interest structures allocate a disproportionate share of prepayments to senior tranches, building up subordination levels and providing a protective cushion against future defaults. After a specified time period — typically the first 36 months — step-down provisions allow subordinate tranches to begin receiving pro-rata allocations of prepayments, provided that defined performance triggers have been satisfied. These triggers typically measure the cumulative loss on the pool and the current delinquency rate against thresholds set at origination. If the collateral has underperformed and triggers have not been met, the step-down is locked — the subordination structure is preserved, protecting senior holders but permanently subordinating the junior classes until performance recovers. In the 2005 to 2007 vintage pools, trigger failures were pervasive: loss rates far exceeded the thresholds set at origination, and step-downs were locked for years, trapping subordinate investors and producing protracted legal disputes over whether servicers were optimizing loss mitigation strategies in ways that affected trigger outcomes.
Prepayment Behavior, Negative Convexity, and OAS Analysis
Prepayment behavior is a defining analytical challenge in the RMBS market. Residential mortgage borrowers possess the option to prepay their loans at par, and the exercise of this option is influenced by prevailing interest rates, housing prices, borrower credit conditions, and refinancing availability. For agency pass-through securities, prepayment risk is the primary source of uncertainty, as credit risk is absorbed by the guarantor. Prepayment speeds are typically expressed using the Conditional Prepayment Rate convention and are modeled using econometric frameworks that incorporate rate incentive, seasoning, burnout, and seasonality factors. The interest-rate sensitivity of RMBS differs from that of bullet-maturity bonds because the embedded prepayment option creates negative convexity, particularly for securities trading at a premium. Agency securities are evaluated using option-adjusted spread analysis calibrated to the yield curve and volatility surface — OAS being the constant spread over the risk-free rate that equates the market price to the present value of expected cash flows across interest-rate scenarios, incorporating the prepayment option's effect on cash-flow timing.
https://www.federalreserve.gov/publications/financial-stability-report.htm
For non-agency RMBS, credit analysis supplements and in many cases supersedes prepayment analysis as the primary valuation driver. Investors must evaluate the credit quality of the underlying mortgage pool by examining loan-level attributes including loan-to-value ratios, borrower credit scores, documentation type, occupancy status, geographic concentration, and vintage. Default and loss severity projections are developed using loan-level models that incorporate borrower and property characteristics, macroeconomic variables, and historical performance data. The interaction between prepayment and default behavior is particularly important in distressed collateral pools, where involuntary prepayments resulting from liquidations and short sales dominate voluntary refinancing activity. In a severely stressed 2006-vintage subprime pool, the CPR may be driven entirely by liquidation proceeds rather than by rate-incentive refinancing — an analytical distinction that requires different models and different assumptions than are used for performing agency collateral.
Credit Analysis for Non-Agency RMBS
The role of servicers in the RMBS market has significant implications for both credit performance and cash-flow distribution. The master servicer and special servicer administer the mortgage pool on behalf of the trust, collecting payments, advancing funds, managing delinquencies, and executing loss mitigation strategies including loan modifications, short sales, and foreclosures. Servicing transfer events, servicer performance variability, and the alignment of servicer incentives with investor interests have been subjects of extensive regulatory attention and litigation. The Consumer Financial Protection Bureau has promulgated servicing standards under Regulation X and Regulation Z that affect the administration of securitized mortgage loans.
https://www.consumerfinance.gov/rules-policy/regulations/1026/
The Regulatory Framework — Dodd-Frank, Regulation AB II, Basel III, and NAIC
The regulatory framework governing RMBS issuance and trading has undergone substantial reform since 2010. The Dodd-Frank Act introduced risk retention requirements under Section 941, codified at 17 CFR Part 246, which generally require securitizers to retain not less than five percent of the credit risk of the assets being securitized. Qualified residential mortgages meeting specified underwriting criteria are exempt from the retention requirement. The Securities and Exchange Commission adopted Regulation AB II, which enhanced the disclosure requirements for registered asset-backed securities offerings, including the provision of loan-level data for residential mortgage securitizations. These reforms were designed to address the misalignment of incentives between originators, securitizers, and investors that contributed to the deterioration in underwriting standards prior to the financial crisis.
https://www.govinfo.gov/content/pkg/FR-2014-12-24/pdf/2014-29256.pdf
https://www.govinfo.gov/content/pkg/FR-2014-09-24/pdf/2014-21375.pdf
From a capital adequacy perspective, the treatment of RMBS holdings varies depending on the holder's regulatory framework and the characteristics of the specific security. The Basel III securitisation framework introduced a hierarchy of approaches for determining capital requirements for securitisation exposures, including the internal ratings-based approach, the external ratings-based approach, and the standardised approach. The framework also established preferential capital treatment for exposures meeting the criteria for simple, transparent, and comparable securitisations. For insurance company holders, the National Association of Insurance Commissioners maintains risk-based capital charges for structured securities that reflect modeled expected losses rather than external ratings alone — a methodology specifically designed to prevent the ratings arbitrage that allowed insurers to hold large amounts of highly rated but fundamentally impaired non-agency RMBS at artificially low capital charges in the pre-crisis period.
https://www.bis.org/bcbs/publ/d303.htm
https://www.bis.org/bcbs/publ/d374.htm
The Financial Crisis — Named Failures, Named Enforcement Actions, and the Post-Crisis Settlement Wave
The non-agency RMBS market experienced severe distress during the financial crisis, with cumulative losses on many subprime and Alt-A vintages from 2005 through 2007 substantially exceeding original rating agency projections. Subprime mortgages grew from 5 percent of total originations — approximately $35 billion — in 1994 to 20 percent — approximately $600 billion — in 2006. The $1.3 trillion in subprime mortgages outstanding as of March 2007 carried losses that rating agencies, relying on correlation assumptions calibrated to historical data that did not include a nationwide decline in home prices, had systematically underestimated. In the third quarter of 2007, subprime ARMs representing only 6.9 percent of U.S. mortgages outstanding accounted for 43 percent of foreclosures beginning in that quarter. By September 2009, 14.4 percent of all U.S. mortgages outstanding were either delinquent or in foreclosure, up from 9.2 percent in August 2008. Foreclosure proceedings reached 1.3 million properties in 2007, 2.3 million in 2008, and 2.8 million in 2009.
https://en.wikipedia.org/wiki/Subprime_mortgage_crisis
https://fcic.law.stanford.edu/report
The post-crisis litigation wave produced the largest series of civil settlements in U.S. history, collectively totaling over $60 billion and naming as defendants every major bank that had originated, securitized, or distributed pre-crisis non-agency RMBS. Bank of America, through its own operations and its acquisitions of Countrywide Financial and Merrill Lynch, reached a $16.65 billion settlement with the Department of Justice in August 2014 — the largest civil settlement with a single entity in American history at that time — including approximately $9.65 billion in cash and $7 billion in consumer relief to homeowners. Attorney General Eric Holder stated that Bank of America, Countrywide, and Merrill Lynch had engaged in pervasive schemes to defraud financial institutions and other investors by misrepresenting the soundness of RMBS. JPMorgan Chase settled in November 2013 for $13 billion, covering its own origination and securitization activity and legacy issues from its acquisitions of Bear Stearns and Washington Mutual — the two largest non-bank subprime players whose positions JPMorgan absorbed during the crisis at federal request. Citigroup settled for $7 billion in July 2014. Goldman Sachs settled for $5 billion in April 2016. Deutsche Bank settled for $7.2 billion in January 2017. Morgan Stanley settled for $3.2 billion in February 2016. RBS settled for $4.9 billion in August 2018. The aggregate of named settlements against Wall Street banks for pre-crisis RMBS conduct exceeded $60 billion, representing the most consequential post-crisis legal enforcement action in the history of the capital markets.
https://www.gao.gov/products/gao-09-782
Representation and warranty litigation represented a parallel and complementary legal framework. Under RMBS transaction documents, originators made representations about the characteristics of the loans they were selling into securitization — representations about loan-to-value ratios, occupancy status, appraisal quality, and compliance with underwriting guidelines. When those representations proved false — as was the case for a substantial portion of 2005 to 2007 vintage collateral — trustees and investors had the right to put back those loans to the originators and require repurchase at par. The put-back litigation wave, which involved GSE representation and warranty claims against Countrywide, IndyMac, Washington Mutual, and their acquirers, as well as private investor claims in the trustee actions, produced additional billions in settlements and fundamentally reshaped the legal framework governing originator liability in securitization.
https://fcic.law.stanford.edu/report
https://www.gao.gov/products/gao-09-782
The Current Non-Agency RMBS Market — Legacy and New Issue
In the secondary market, legacy non-agency RMBS trade at spreads that reflect collateral credit quality, structural position within the waterfall, remaining credit enhancement, projected cash-flow timing, and liquidity. The outstanding universe of pre-crisis non-agency securities — more than 22,000 CUSIPs across the S&P index coverage universe alone — continues to amortize and pay down, and the tradeable float has declined considerably from its peak. The most sophisticated buyers in this market today are distressed credit funds, structured credit specialists, and hedge funds that can perform the loan-level modeling required to identify mispriced recovery scenarios in pools where the interaction between trigger status, servicer strategy, and remaining subordination determines actual cash flow.
https://www.sifma.org/resources/research/fact-book/
https://www.regancapital.com/insights/research/rmbs-primer/
New-issue non-agency RMBS activity has resumed on a more significant basis than in the immediate post-crisis years. Through 2024, private-label RMBS supply totaled approximately $18 billion in the first part of the year according to the Structured Finance Association, with non-QM-backed deals and prime jumbo mortgages leading issuance. KBRA projected full-year 2025 private-label RMBS issuance at approximately $67 billion and 2026 at approximately $160 billion — which would make 2026 the highest year for new private-label issuance since the financial crisis. J.P. Morgan, through its J.P. Morgan Mortgage Trust conduit, was the single largest private-label sponsor in 2021 with $20.3 billion in deals representing nearly 18 percent of total market volume. Non-QM securitizations — backing loans to self-employed borrowers, investors, and others who do not meet the Qualified Mortgage ability-to-repay standards — have emerged as the largest single growth driver, reflecting the permanent structural shift in mortgage origination away from full-documentation GSE-eligible loans toward borrowers who need alternative underwriting but represent genuine credit quality.
https://structuredfinance.org/resources/sfa-research-corner-3/
https://www.nationalmortgagenews.com/news/non-qm-residential-mortgage-backed-bonds-may-break-record
https://www.housingwire.com/articles/private-label-rmbs-market-has-cause-to-celebrate/
Valuation of RMBS requires the integration of multiple analytical disciplines. Agency securities are evaluated primarily through option-adjusted spread analysis, which prices the embedded prepayment option using interest-rate models calibrated to the yield curve and volatility surface. Non-agency securities require cash-flow modeling that incorporates loan-level default, loss severity, and prepayment projections under base-case and stress scenarios, with the resulting cash flows discounted at spreads reflecting the security's credit risk, structural complexity, and liquidity characteristics. For distressed or litigated positions, valuation may additionally require analysis of representation and warranty claim viability, settlement probabilities, and the expected timing and magnitude of recoveries from legal proceedings.
Conclusion
The RMBS market's history is defined by the gap between what was represented and what was true in the 2005 to 2007 vintage years — a gap measured in $1.3 trillion in subprime mortgages, 2.8 million foreclosure proceedings in 2009, $60 billion in post-crisis settlements, and the complete regulatory restructuring of residential mortgage origination and securitization that followed. The named originators — Countrywide Financial with its 25 percent share of the U.S. mortgage market at peak, IndyMac, Washington Mutual, Ameriquest, New Century — the named securitization shelves — CWL, INDX, WMALT, BSABS — and the named product failures — NINJA loans, payment option ARMs with negative amortization, simultaneous second liens enabling zero-equity purchases, and 2/28 ARMs with teaser rates below 4 percent resetting to payment shock — collectively represent the most consequential underwriting failure in the history of the fixed-income markets. The Dodd-Frank risk retention rule, Regulation AB II, the CFPB servicing standards, and the Qualified Mortgage ability-to-repay framework that replaced the pre-crisis origination environment are the direct regulatory legacy of those failures. The new-issue non-agency market — projected to reach $160 billion in 2026 — is built on fundamentally different underwriting and disclosure standards, serving the genuine credit needs of borrowers who do not fit GSE eligibility requirements rather than the volume-driven securitization machine of the pre-crisis era.
Corvid Partners approaches residential mortgage-backed securities from both a legal and capital-markets perspective, considering origination practices, regulatory framework, structural protections, collateral performance, servicer conduct, secondary-market trading behavior, and litigation dynamics. The firm's experience spans multiple market cycles and transaction types, including agency pass-through and CMO structures, non-agency senior and subordinate tranches across prime, Alt-A, and subprime collateral, credit-risk-transfer securities, and distressed and litigated positions requiring integrated legal and financial analysis — an understanding built from the trading desk level through the full arc of the non-agency market, from its expansion and collapse to the years of litigation, loss attribution, and portfolio resolution that followed, including the direct management of legacy RMBS positions at Barclays in the aftermath of the Lehman acquisition, where the gap between stated loan characteristics and actual collateral performance was measured in real time against the backdrop of a market in which no bid existed for any price.
https://www.sifma.org/resources/research/fact-book/
https://fcic.law.stanford.edu/report
Bibliography
Government National Mortgage Association
Federal National Mortgage Association
Federal Home Loan Mortgage Corporation
Federal Housing Finance Agency
Consumer Financial Protection Bureau — Regulation Z (Truth in Lending, servicing standards under Regulation X and Z)
https://www.consumerfinance.gov/rules-policy/regulations/1026/
Credit Risk Retention Final Rule — Dodd-Frank Section 941 (5% risk retention, QRM exemption)
https://www.govinfo.gov/content/pkg/FR-2014-12-24/pdf/2014-29256.pdf
SEC Regulation AB II — Asset-Backed Securities Disclosure and Registration (loan-level data requirement, enhanced disclosure)
https://www.govinfo.gov/content/pkg/FR-2014-09-24/pdf/2014-21375.pdf
Financial Crisis Inquiry Commission — Final Report (origination practices, NINA/NINJA loans, rating agency failures, securitization chain)
https://fcic.law.stanford.edu/report
U.S. Government Accountability Office — Financial Regulatory Reform
https://www.gao.gov/products/gao-09-782
Basel Committee on Banking Supervision — Revised Securitisation Framework (SEC-IRBA, SEC-ERBA, SEC-SA hierarchy; STC preferential treatment)
https://www.bis.org/bcbs/publ/d303.htm
Basel Committee on Banking Supervision — STC Securitisation Standard
https://www.bis.org/bcbs/publ/d374.htm
Securities Industry and Financial Markets Association — Capital Markets Fact Book
https://www.sifma.org/resources/research/fact-book/
Board of Governors of the Federal Reserve System — Financial Stability Report
https://www.federalreserve.gov/publications/financial-stability-report.htm
Federal Reserve — Supervisory Letter SR 07-12: Subprime Mortgage Lending (July 2007 interagency statement, payment shock, fully indexed rate underwriting, stated income guidance)
https://www.federalreserve.gov/boarddocs/srletters/2007/sr0712.htm
Wikipedia — Subprime Mortgage Crisis ($1.3T subprime outstanding March 2007, subprime from 5% in 1994 to 20% in 2006, 43% of Q3 2007 foreclosures from subprime ARMs, 14.4% delinquency/foreclosure September 2009, option ARM one-third of originations)
https://en.wikipedia.org/wiki/Subprime_mortgage_crisis
Center for Public Integrity — The Roots of the Financial Crisis: Who Is to Blame (Countrywide $97.2B subprime 2005-2007 largest originator, Ameriquest $80.6B, New Century $75.9B; Lehman $106B/RBS $99B/Countrywide Securities $74.5B top underwriters)
LawShelf — The Subprime Mortgage Crisis: Causes and Lessons Learned (NINJA loans defined, 2/28 ARM teaser rate mechanics, piggyback loans enabling zero down payment, 70% estimated false information on applications)
Duke University American Predatory Lending Project — Subprime Lending (NINJA definition, 80% subprime loans with prepayment penalties vs 2% conventional, ARM delinquency rates by type)
https://predatorylending.duke.edu/business-analysis/evolution-of-mortgage-lending/subprime-lending/
DOJ — Justice Department and Federal Partners Secure $16.65 Billion Settlement with Bank of America (largest civil settlement with single entity in U.S. history, BofA + Countrywide + Merrill Lynch named, $9.65B cash + $7B consumer relief)
HousingWire — Is Settlement Looming Between U.S. and RBS (Goldman Sachs $5B April 2016, JPMorgan $13B November 2013, Citigroup $7B July 2014, Bank of America $16.65B August 2014; RBS $4.9B August 2018; Deutsche Bank $7.2B January 2017)
S&P Dow Jones Indices — U.S. Non-Agency RMBS Index (22,000+ CUSIPs, $800B+ outstanding principal balance, 27 sub-indexes across Prime/Sub-Prime/Alt-A/Option ARM categories, 350 senior bonds in trackable universe)
https://www.spglobal.com/spdji/en/landing/topic/us-non-agency-rmbs/
Structured Finance Association — SFA Research Corner (non-agency RMBS supply $18B 2024, non-QM and jumbo leading, HELOC/CES $1.4B, overall securitization $939B H1 2024)
https://structuredfinance.org/resources/sfa-research-corner-3/
National Mortgage News — Private-Label RMBS Set for Biggest Year Since Crisis (KBRA $67B 2025 forecast, $160B 2026 forecast would be highest since GFC, non-QM leading)
https://www.nationalmortgagenews.com/news/non-qm-residential-mortgage-backed-bonds-may-break-record
HousingWire — Private-Label RMBS Market Has Cause to Celebrate (J.P. Morgan Mortgage Trust 2021 $20.3B = 18% of $115B market, jumbo $60B, non-QM $25B, investment property $23B; non-agency share grew from 1.83% in 2012 to 5% in 2019)
https://www.housingwire.com/articles/private-label-rmbs-market-has-cause-to-celebrate/
Regan Capital — RMBS Primer (legacy non-agency 2005-2007 vintage universe, three-tier FICO categorization, liquidity risk in OTC non-agency market)
https://www.regancapital.com/insights/research/rmbs-primer/
DoubleLine Capital — Securitized Products Market Overview (COLT 2023-1 non-QM structure, risk retention vertical/horizontal mechanics, capital structure evolution driven by historical losses)
https://doubleline.com/wp-content/uploads/Securitized-Products-Market-Overview-f.pdf
ISDA — International Swaps and Derivatives Association
Fabozzi, Frank J. — The Handbook of Mortgage-Backed Securities. Oxford University Press.
Corvid Partners