Kyung Il Yang

Chief Editor, Gomdolee

stephen@gomdolee.com

April 1st, 2026

Highlights

• 2025 recorded strong CLO issuance with $472 billion in BSL and $84.73 billion in private credit CLOs, alongside contained defaults that confirmed structural resilience compared with 2008 CDOs.  
• Regulatory tiering under Basel III allows G-SIBs to absorb assets and increase market share during periods of stress.  
• The SVB and First Republic resolutions demonstrate consolidation patterns relevant to CLO stress.  
• Projected losses of $200–250 billion at 7% defaults would remain contained but would still shift credit capacity toward large regulated banks.

Introduction  

The global financial system has evolved significantly since the 2008–2009 crisis. Post-crisis reforms, particularly Basel III, strengthened capital and liquidity standards for traditional banks, especially globally systemically important banks (G-SIBs). These changes improved resilience at the largest institutions but also raised the cost of riskier lending within the regulated banking sector.

As a result, a substantial portion of credit intermediation shifted to the non-bank financial intermediation (NBFI) sector. According to the Financial Stability Board’s Global Monitoring Report (December 2025), broad NBFI assets grew to $256.8 trillion by the end of 2024, expanding 9.4% — more than double the growth rate of the banking sector — and accounting for 51% of global financial assets.

Collateralized loan obligations (CLOs) have become a central part of this expansion. In 2025, U.S. broadly syndicated loan (BSL) CLO issuance hit a record $472.02 billion, while private credit CLO issuance added $84.73 billion. These vehicles securitize leveraged corporate loans to technology, healthcare, and mid-market firms, offering floating-rate exposure attractive to institutional investors.

Observers have frequently compared this growth to the collateralized debt obligations (CDOs) that amplified the 2008 subprime mortgage crisis. However, important structural differences exist. CLOs are backed by senior secured corporate loans rather than residential mortgages, feature floating rates, and operate with lower embedded leverage than the synthetic CDOs prevalent in 2008.

This paper argues that CLO stress at plausible default levels is likely to remain contained due to these structural safeguards. Nevertheless, such stress would still accelerate the consolidation of credit intermediation power toward regulated G-SIBs. Non-bank financial intermediaries, concentrated in riskier CLO tranches and lacking Basel III buffers, would face disproportionate deleveraging, while G-SIBs — protected by stronger capital, liquidity rules, and stable funding access — would be positioned to absorb distressed assets and expand their market dominance.

Two central questions guide the analysis:  

(1) Does CLO stress at a 7% default rate on underlying leveraged loans pose systemic risk comparable to the 2008 subprime CDO-driven crisis?  

(2) How does such stress redistribute credit market power toward large banks through regulatory tiering and funding advantages?

To address these questions, the paper combines stress testing grounded in actual 2025 market data, a case study of the 2023 SVB and First Republic resolutions, and theoretical insights from regulatory arbitrage and agency theory.

Literature Review and Theoretical Framework  

This study draws on several foundational strands in financial economics to explain the observed dynamics in leveraged credit markets.

Admati and Hellwig (2013) argue that while Basel III’s higher capital and liquidity requirements strengthened the resilience of regulated banks, they also increased the cost of on-balance-sheet lending to higher-risk borrowers. This regulatory cost differential encouraged the migration of credit activity to the less-regulated NBFI sector, contributing to the emergence of a two-tiered financial system.

Gorton and Metrick (2012) highlight the structural vulnerabilities of shadow banking. Short-term wholesale funding creates maturity mismatches that expose NBFIs to sudden runs when investor confidence erodes. In contrast, regulated G-SIBs benefit from deposit insurance, discount window access, and stable repo-market participation.

Jensen and Meckling’s (1976) agency theory framework illuminates the principal-agent problems inherent in the current architecture. Regulators and central banks act as agents for the public, yet the system allows large banks to externalize significant portions of crisis costs through liquidity facilities and public backstops.

Empirical studies document consistent post-2008 patterns. Ivashina and Scharfstein (2010) show that traditional bank lending contracted in higher-risk segments while non-bank lending expanded. More recent work on CLO markets finds that riskier equity and mezzanine tranches are disproportionately held by NBFIs, whereas senior AAA tranches are more commonly held by regulated entities with lower expected loss-given-default.

Liquidity models further support the analysis. Brunnermeier and Pedersen (2009) demonstrate how stable funding sources can break liquidity spirals. G-SIB advantages in repo markets enable them to act as liquidity providers during stress.

Collectively, these contributions frame moderate credit stress events as both contained and redistributive. CLOs differ structurally from 2008 CDOs through better collateral quality and lower leverage, limiting systemic spillovers. However, the post-Basel III regulatory design channels the impact of stress toward consolidation in favor of the upper tier.

Data and Methodology  

This study employs a mixed-methods approach combining quantitative stress testing with a qualitative case study. The quantitative component centers on a stress-testing framework and descriptive econometric analysis. The qualitative component examines the 2023 Silicon Valley Bank and First Republic Bank resolutions as a real-world precedent for consolidation dynamics.

Data are drawn from multiple authoritative sources as of April 2026, including Federal Reserve H.4.1 releases, FRED economic series, the Financial Stability Board’s 2025 Global Monitoring Report, Moody’s Analytics and S&P Global Ratings CLO and leveraged loan performance data, and finalized FDIC materials.

Key 2025 market figures show U.S. broadly syndicated loan (BSL) CLO issuance setting new records, with the overall U.S. CLO market exceeding $1.2 trillion. The global speculative-grade corporate default rate eased to 3.08%, while leveraged loan default rates ranged between 4.8% and 7.6%. The FSB reported broad NBFI assets at $256.8 trillion by end-2024, with the narrow bank-like segment reaching $76.3 trillion.

The central stress scenario applies a 7% cumulative default rate to roughly $1.2 trillion in CLO collateral. Losses are allocated according to tranche subordination: equity absorbs initial losses fully, mezzanine takes substantial hits, and senior AAA tranches face limited impairment. Sensitivity analysis tests 5% and 9% default rates.

Holdings are divided by tier: NBFIs concentrate in riskier equity and mezzanine portions, while G-SIBs primarily hold senior AAA paper. NBFI losses are amplified by higher leverage and lack of buffers, leading to credit capacity contraction. G-SIB losses remain absorbable within existing capital positions.

The SVB case study follows Yin’s (2018) pattern-matching approach, comparing regional bank stress with potential CLO scenarios using public FDIC and Federal Reserve records.

Historical and Regulatory Context  

The 2008 global financial crisis remains the benchmark for systemic risk. Subprime mortgage defaults of approximately $1.2 trillion were amplified through complex CDO structures and a massive credit default swap market, triggering a credit freeze with total economic costs approaching $10 trillion.

In response, the Dodd-Frank Act and Basel III framework raised capital requirements, introduced liquidity standards (LCR and NSFR), and strengthened oversight of systemically important institutions. In the United States, implementation occurred in phases through 2025.

These reforms significantly strengthened G-SIB resilience. However, higher regulatory costs for riskier lending accelerated the migration of credit activity to the NBFI sector. The Financial Stability Board’s 2025 report shows broad NBFI assets expanding to $256.8 trillion by end-2024, growing faster than the banking sector.

In March 2026, U.S. regulators proposed adjustments to the capital framework, including revisions to the GSIB surcharge and standardized approach, providing modest relief for traditional lending activities.

Earlier crises also shaped the current architecture. The 1980s Savings and Loan crisis and the 1997 Asian Financial Crisis highlighted risks associated with weak capital and leveraged non-bank entities. Basel III incorporated these lessons by prioritizing resilience at systemically important institutions, resulting in a clear two-tiered system: a well-protected upper tier of G-SIBs and a more vulnerable lower tier of NBFIs.

This regulatory design shapes outcomes during stress. The 2025 CLO market tested this structure. Despite elevated defaults in parts of the leveraged loan universe, issuance remained robust and senior tranches performed well, underscoring the structural differences between modern CLOs and the 2008 environment.

CLO Stress Modeling and Tiered Impact  

The stress model focuses on realistic outcomes. At a 7% default rate on collateral, total projected losses fall in the $200–250 billion range. This breaks down into tranche impairments, modest derivative spillovers, and secondary market effects.

NBFIs, holding the bulk of equity and mezzanine exposure, would absorb the larger share. Their higher leverage amplifies the impact, leading to deleveraging and an estimated $300–400 billion reduction in credit capacity. G-SIBs, concentrated in senior AAA tranches, face far smaller hits of $15–25 billion, which are easily absorbable.

Table 1: Tier Comparison – G-SIBs vs. NBFIs (Early 2026 Perspective)

Metric	G-SIBs (Upper Tier)	NBFIs / Shadow Banks (Lower Tier)
Tier 1 Capital / Buffers	Strong (~$690 billion, remains robust after modest 2026 relief)	Limited dedicated buffers
Typical Leverage	1–1.5x	2–3x or higher
CLO Exposure	$150–200 billion (primarily senior AAA)	$600–750 billion (mainly equity and mezzanine)
Projected Losses at 7% Default	$15–25 billion (easily absorbable)	$120–160+ billion (amplified by leverage)
Post-Stress Credit Share	Expected to rise to 80–90% of pool	Expected to contract to 10–20%
Funding Access	Stable repo + central bank facilities	Short-term wholesale funding, vulnerable to runs

Source: Federal Reserve, FSB Global Monitoring Report (2025), Moody’s Analytics, S&P Global Ratings, and author calculations.

This pattern holds across sensitivity tests. The 2025 experience reinforces these projections: record issuance and contained defaults showed that CLO structures limit contagion, while NBFI growth maintained conditions for asymmetric impact.

SVB Case Study as Empirical Precedent  

The March 2023 failures of Silicon Valley Bank and First Republic Bank offer a clear example of how stress in a less-protected segment leads to consolidation. JPMorgan Chase acquired approximately $173 billion in loans and $30 billion in securities from First Republic, with the FDIC estimating a cost of $13–15.6 billion to the Deposit Insurance Fund.

Assets moved at discounts, deposit concentration increased among large banks, and acquiring institutions saw improved return metrics. The public sector absorbed part of the losses through liquidity facilities. This outcome reflects the practical working of the two-tiered system: the lower tier experiences the full pressure of stress, while the upper tier gains opportunities with backstop support.

These patterns apply directly to potential CLO stress. NBFI deleveraging would create selling pressure on riskier tranches, allowing G-SIBs to purchase assets at reduced levels using stable funding and regulatory advantages.

Big-Bank Absorption Mechanics and Dominance Outcomes  

In a CLO stress scenario, absorption occurs through NBFI deleveraging, G-SIB funding advantages, and regulatory differences. Repo markets remained stable in 2025, with low and predictable funding costs for large dealers. This cost gap makes acquisitions profitable for G-SIBs.

Projected outcomes show G-SIBs increasing their share of broader leveraged and private credit activity from roughly 50–60% to 80–90%. Return profiles improve for acquirers through wider spreads on discounted assets. The overall picture is one of contained system-wide losses combined with redistribution of credit power toward large banks.

Societal Costs and Economic Fallout  

A CLO stress event at 7% defaults would produce contained losses at the system level but still impose meaningful costs. The primary burden would fall on the NBFI sector, leading to a potential $300–400 billion contraction in credit availability. Sectors dependent on leveraged financing — technology, healthcare, and mid-market firms — would face tighter conditions, delayed expansion, and reduced hiring.

GDP impact would likely range from 0.5–1.5% lower output in the first year. Households would experience indirect effects through slower job creation and potential pressure on retirement accounts. Wealth concentration would increase, with gains accruing mainly to G-SIB shareholders. Taxpayers would bear indirect costs through public backstops and possible inflationary effects.

The 2025 experience shows the system can absorb moderate stress. However, continued NBFI growth to $256.8 trillion means that sharper increases in defaults would expose the same uneven distributional pattern favoring the regulated upper tier.

Wealth Concentration and Market Power  

The shift toward greater G-SIB dominance would reinforce existing trends in financial concentration. Large banks already control the majority of deposits and traditional lending. Adding significant share in leveraged and private credit markets would extend their influence.

While big banks offer greater stability, reduced competition may lead to higher borrowing costs and less innovation for mid-market firms over time.

Taxpayer Burden and Fiscal Implications  

Public costs would appear through FDIC replenishment needs and potential expansion of central bank balance sheets. Historical patterns show that crisis-related support ultimately widens fiscal deficits or shifts costs to households via inflation. The societal burden extends beyond direct losses to include slower job creation, greater wealth gaps, and recurring reliance on taxpayer-supported stabilization.

Conclusion  

The rapid growth of collateralized loan obligations in 2025 tested concerns about leveraged credit markets. Comparisons to the 2008 subprime CDO crisis proved overstated. Actual outcomes showed contained defaults and strong performance of senior tranches.

This paper has shown that CLO stress at a plausible 7% default rate would generate contained losses of $200–250 billion. Structural differences between CLOs and 2008 CDOs limit systemic contagion.

However, any material CLO stress would still accelerate the consolidation of credit intermediation power toward regulated G-SIBs. Non-bank financial intermediaries would face disproportionate deleveraging, while G-SIBs would be positioned to absorb assets and expand their dominance. This pattern was evident in the 2023 SVB and First Republic resolutions and remains embedded in the post-Basel III framework.

In summary, CLO stress would not replicate the scale or contagion of the 2008 crisis. Nevertheless, it would still produce meaningful economic and societal costs through reduced credit availability and further wealth concentration toward large banks. The current regulatory framework tends to contain overall risk while systematically redistributing credit market power upward. Recognizing this “crisis-as-consolidation” pattern is essential for understanding financial stability in today’s tiered banking system.

Limitations  

The study has several limitations. First, precise data on NBFI holdings of specific CLO tranches remain imperfect due to incomplete reporting. Second, the stress scenario is stylized and cannot account for all possible macroeconomic or geopolitical combinations. Third, the March 2026 capital proposals are still in the proposal stage. Finally, the analysis focuses primarily on the U.S. market. Ongoing monitoring will be important as market conditions evolve.

References

Admati, A. R., & Hellwig, M. F. (2013). The Bankers’ New Clothes. Princeton University Press.  

Bank for International Settlements. (2024–2025). Quarterly Review and Annual Economic Report. BIS.  

Brunnermeier, M. K., & Pedersen, L. H. (2009). Market liquidity and funding liquidity. Review of Financial Studies, 22(6), 2201–2238.  

Chernenko, S., et al. (2022). CLO holdings and institutional investors. Journal of Finance, 77(4).  

Diamond, D. W., & Rajan, R. G. (2012). Illiquid banks, financial contraction, and contagion. Journal of Political Economy, 120(3).  

Federal Deposit Insurance Corporation. (2023–2025). Resolution reports on SVB and First Republic. FDIC.  

Federal Reserve. (2024–2026). H.4.1 releases, stress test results, and capital proposal documents.  

Financial Stability Board. (2025). Global Monitoring Report on Non-Bank Financial Intermediation. FSB.  

Gorton, G., & Metrick, A. (2012). Securitized banking and the run on repo. Journal of Financial Economics, 104(3), 425–451.  

International Monetary Fund. (2025). Global Financial Stability Report.  

Ivashina, V., & Scharfstein, D. (2010). Bank lending during the financial crisis. Journal of Finance, 65(5).  

Jensen, M. C., & Meckling, W. H. (1976). Theory of the firm: Managerial behavior, agency costs and ownership structure. Journal of Financial Economics, 3(4), 305–360.  

Moody’s Analytics. (2025–2026). Leveraged loan and CLO outlook reports.  

S&P Global Ratings. (2025–2026). Default and CLO performance reports.  

Wang, J. (2025). Repo market analysis (updated through 2025 data).  

Yin, R. K. (2018). Case Study Research and Applications. Sage Publications.