Francesco Di Costanzo
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(14) Why Small Banks Are Being Left Behind by the SRT Market They Need Most

/14 min read

The Paradox of Beneficial Exclusion

The significant risk transfer market has grown sharply. According to the BIS March 2026 Quarterly Review, global SRT issuance increased fivefold since 2016, with protected loan portfolios reaching nearly €800 billion by end-2024 and roughly eight new banks entering annually, bringing cumulative issuers above 100. The IACPM Global SRT Bank Survey reports 2024 transactions up nearly one-third globally, protecting €21 billion of credit risk on €260 billion of underlying loans. Against that backdrop, the market's standard claim — that SRT is democratising, that it is no longer a G-SIB instrument — has become conventional wisdom.

The conventional wisdom is directionally correct and substantively misleading. AFME has noted directly that 40% of EU lending originates from standardised-approach banks that have "limited access to SRT, largely due to the lack of risk sensitivity of the EU prudential framework." Under the Basel III standardised approach, corporate and SME risk weights typically range from 75% to 150%, compared with 20–50% for equivalent assets under banks' internal ratings-based models at larger institutions. The theoretical capital benefit of SRT — measured as reduction in risk-weighted assets — is proportionally larger for the bank with higher starting risk weights. The bank that most needs the product faces the highest barrier to using it. That is not a market imperfection at the margin; it is a structural feature worth examining carefully.

Who Actually Issues

The BIS March 2026 paper's analysis of 28 EU SRT-issuing banks against 78 non-issuing peers is the most precise public dataset on this question. The median total assets of SRT-issuing institutions exceeded €290 billion — more than four times the median size of non-issuers. A probit regression on the same data found that bank size and CET1 ratio were the only statistically significant predictors of SRT issuance; return on equity and loan concentration were not significant. The implication is that SRT participation is driven by institutional scale and balance-sheet management capability, not by which banks face the most acute capital pressure.

Concentration on the issuer side is confirmed from multiple angles. In the BIS Pillar 3-based sample of 44 SRT-active banks across Canada, Europe, Japan, and the United Kingdom, the top 10 issuers represented 64% of total outstanding SRT amount as of end-2024, with EU-domiciled banks accounting for approximately half of global volume. At the EU level, IMF Working Paper WP/25/200 (Cortes, Fernandez Dionis, Li, Ramirez, and Zhang, October 2025) found the top 10 EU issuers accounting for 95% of EU outstanding SRT, the top three for 53%, and the single largest for 22%. The ESRB Occasional Paper No. 23, drawing on ECB supervisory data from 2018 to 2022, found the top four SSM banks accounting for roughly 60% of notional volume, with that share declining only as more banks joined — not as the market became genuinely distributed. The "more issuers" headline does not disturb the concentration reality.

The IRB versus standardised-approach distribution follows the same pattern. The IACPM Global SRT Bank Survey 2016–2024 shows that issuing banks used the IRB approach for an average of 85% of underlying SRT loan portfolios across the full period, with the SA share rising from less than 5% in 2016 to approximately 20% in 2024. That the SA share has quadrupled in eight years is meaningful evidence of broadening. That it remains at 20% after eight years is equally meaningful evidence of structural friction. AFME is more direct: IRB banks "have been the principal beneficiaries" of SRT "over more than 20 years."

The Economics of Entry

The BIS and AFME observations on concentration point to a structural explanation: the economics of SRT are unfavourable below a threshold that most smaller banks cannot reach. The IMF WP/25/200 documents that average SRT deal size has fluctuated between $2.0 and $2.5 billion per transaction since 2020. The IACPM survey reports 2024 EU underlying pools of €152 billion across surveyed banks — numbers dominated by large annual programs, not episodic smaller deals. The Ally Financial case, the best-documented US non-G-SIB example, used a $3 billion prime auto reference pool. These are not benchmarks against which a €5 billion community bank can easily calibrate.

The True Sale International German Securitisation Platform Final Report (September 2023) provides the clearest publicly available breakpoint. For banks with a balance sheet total of approximately €10–30 billion, a single-originator SRT transaction "could be worthwhile depending on the portfolio structure." For smaller banks below that range, "the high fixed costs distributed across the absolute amount of capital relief would probably not be worthwhile." The TSI report itemizes the cost categories: IT infrastructure for historical loss data and loan-level portfolio files, ongoing monthly investor reporting, regulatory transparency requirements, new product processes requiring coordination across accounting, legal, compliance, risk, and IT divisions, plus external partners including trustee, verification agent, lawyers, auditors, and arranger. IT build alone is described as a "potential knockout criterion" for smaller regionally oriented banks — a large, one-off fixed cost incurred before a single euro of capital relief is obtained.

The British Business Bank Securitisation Research (2022) documented the same structural problem for SME securitisation: set-up costs "would only be amortised if sufficient volumes of securitisation transactions were expected." Based on documented cost categories from the TSI report and practitioner commentary, industry estimates suggest first-transaction costs in the range of €1.5–5.5 million (legal, IT infrastructure, regulatory advisory, rating agency fees, and arranger costs). On a €500 million reference portfolio generating perhaps €20–30 million of capital relief, that represents 5–28% of the first year's benefit — economics that improve materially only above approximately €1.5 billion in reference portfolio size. A standard SRT transaction additionally requires approximately four to six months from project kick-off to close based on AFME's documented parallel workstream structure, with first-time issuers facing a further six to twelve months to build the data and reporting infrastructure needed before execution can begin.

The Regulatory Ratchet

Regulatory developments since 2023 have, on balance, deepened the access gap for smaller banks rather than narrowed it. The most telling example is the ECB's December 2025 Guide on SRT notifications, which introduced the fast-track process. The fast-track cuts the ECB's response time from three months to eight working days, with notification required ten working days before closing — a genuine efficiency improvement for banks that can use it. The eligibility criteria include a portfolio notional cap of €8 billion, a CET1 relief cap of 25 basis points at the consolidated group level, minimum effective exposures of at least 100, no single obligor exceeding 2% of the pool, and no defaulted exposures at origination. None of those constraints are obviously prohibitive for a mid-sized institution with a granular corporate loan portfolio.

The constraint that matters is different. The fast-track explicitly excludes "securitisations from originators without SRT issuance in the past five years, assessed at a group level." A bank executing its first SRT transaction — precisely the institution for which regulatory certainty would be most valuable — is ineligible. The fast-track is a throughput mechanism for established programs. The 25 basis points CET1 cap compounds the asymmetry in proportional terms: a bank with €290 billion in assets gains significantly more absolute CET1 headroom from the same bps threshold than a bank with €20 billion in assets, meaning the same regulatory cap that disciplines large-bank exposure to the tool may represent an insufficient return to justify small-bank infrastructure investment.

The United Kingdom's January 2026 update to PRA Supervisory Statement SS9/13 creates a parallel burden for standardised-approach banks. The PRA requires SA portfolio issuers to apply a scalar of 1.5 to KSA when calculating the minimum detachment point needed to justify commensurate risk transfer. This means the protected tranche must be sized more conservatively than the underlying KSA calculation would imply — increasing the protection premium and reducing the net economics of the transaction proportionally. In the United States, the Federal Reserve's September 2023 FAQ clarified that directly issued credit-linked notes require a bank-specific reservation of authority, with each bank negotiating individually and approvals non-transferable. Ally Financial's May 2024 Fed permission letter — authorizing $330 million in CLNs on a $3 billion auto pool and capping aggregate reference portfolios at the lower of $20 billion or total capital — illustrates what "permissioned access" looks like in practice. Each bank negotiates from scratch; there is no precedent that transfers.

The Strongest Counterargument

The most credible challenge to this analysis is that the market is genuinely broadening. The BIS's stable figure of approximately eight new banks per year since 2016, the SA share rising from under 5% to 20% in eight years, and the ESRB's documentation of increasing standardised-approach bank participation since the 2021 STS rule changes are real data points. The European Commission's June 2025 securitisation reform proposals take explicit aim at the SA disadvantage, including reductions in the p-factor for SEC-SA calculations and lower risk weight floors for STS tranches — changes that, if enacted, would improve SA bank economics materially.

The reforms are real and their direction is correct. But they address capital economics, not operational build cost, investor concentration, or the supervisory process that defines the entry experience. Even with improved SEC-SA economics, a first-time issuer still faces the estimated €1.5–5.5 million in first-transaction costs, a six-to-twelve-month infrastructure build timeline, and no access to the ECB fast-track. The BIS March 2026 probit regression's finding that bank size and CET1 are the only significant determinants of SRT issuance is not a finding about capital economics; it is a finding about who has the institutional capacity to execute. Capital economics alone do not determine access.

Equally, the characterisation of new entrants matters. BIS explicitly notes that non-G-SIBs currently active in SRT "are not small: most are designated as domestic systemically important in their home jurisdiction." These are institutions with substantial structured finance capabilities and established regulatory relationships, not the community and regional banks for which the access question is most pressing. The definitional slippage between "non-G-SIB" and "small bank" obscures more than it reveals.

The Platform Gap and What Would Actually Change Things

The most analytically honest path to genuine small-bank access is pooling — multi-originator structures that amortize fixed costs across a group of smaller institutions, reduce minimum viable portfolio size, and build the investor familiarity that accelerates supervisory review. The evidence on this pathway is not encouraging in terms of operational reality. The TSI September 2023 report proposes exactly such a structure for German savings and cooperative banks, noting that IT infrastructure costs are largely fixed and have "high potential for economies of scale." The German savings bank S-Kreditbasket and cooperative VR Circle structures provide existing infrastructure for portfolio aggregation and cross-liability management — but neither achieves regulatory capital relief under the Securitisation Regulation. As of early 2026, the TSI's recommendation had not produced a commercially operational execution. In the United States, Mayer Brown's January 2026 SRT presentation notes that market participants are "exploring aggregator platforms to unlock regional bank market" — a nascent concept, not an operating market.

The European Investment Fund's bilateral SRT programme — which has supported approximately €55 billion in new SME lending commitments since 2013 according to AFME — works as a government-mediated access channel, with the EIF acting as a zero-risk-weighted supranational protection seller. It is evidence of what small banks can access when a public institution absorbs the investor market gap; it is not evidence that the commercial market is accessible without that intermediation. Investor concentration independently constrains small-bank access: the IMF WP/25/200 documents the top 10 SRT investors globally holding over 75% of banks' outstanding SRT exposure, with credit funds and asset managers representing approximately 60% of the investor pool. Concentrated investors rationally allocate scarce due-diligence time to established programs with historical data and ongoing data rooms, not to first-time issuers building their first reference portfolio file.

Where the Access Gap Actually Lands

The argument that SRT is "only for G-SIBs" has always been too strong, and the evidence confirms it. The argument that SRT is "broadly accessible to smaller banks" is equally unsupported. The accurate finding, consistent across the BIS, IMF, ESRB, IACPM, TSI, and practitioner literature, is that the market is structurally optimized for large, repeat programme issuers, that the entry cost structure imposes a disproportionate burden on smaller institutions, and that regulatory developments — while genuinely improving efficiency for established programs — have not resolved and in some cases have reinforced the first-timer penalty. The banks for which capital relief is most valuable — those carrying the highest risk weights under standardised approaches, with the least access to capital market alternatives — remain largely outside the market they most need.

The question for regulators and market infrastructure providers is whether this is worth solving, and through what mechanism. The historical parallel is not reassuring. AFME's December 2024 consultation response to the EC's securitisation framework review noted that STS securitisation "has not resulted in an increase in issuance levels or attracted new participants due to the excessive complexity of STS securitisation and the excessive burdens placed on originators." Access and benefit are not the same concept. If the pattern from SME securitisation holds, the answer to "who will use SRT at scale?" ten years from now will still be: the banks that already do.

Sources

Market Structure and Concentration

  1. BIS, "The rise and risks of synthetic risk transfers" https://www.bis.org/publ/qtrpdf/r_qt2603c.pdf

  2. Basel Committee on Banking Supervision, "Synthetic risk transfers" https://www.bis.org/bcbs/publ/d607.pdf

  3. IMF, "Recycling Risk: Synthetic Risk Transfers" (WP/25/200) https://www.imf.org/-/media/files/publications/wp/2025/english/wpiea2025200-source-pdf.pdf

  4. ESRB, "The European significant risk transfer securitisation market" (Occasional Paper No. 23) https://www.esrb.europa.eu/pub/pdf/occasional/esrb.op23~07d5c3eef2.en.pdf

  5. IACPM, "Global SRT Bank Survey Results 2016–2024 — Select Public Results" https://members.iacpm.org/common/Uploaded%20files/Samples/Downloadable%20content/Research_Risk%20Mitigation%20Tools/IACPM%20Global%20SRT%20Bank%20Survey%20Results%202016-2024%20-%20Select%20Public%20Results.pdf

  6. IACPM, "Global SRT Bank Survey 2024 press release" https://iacpm.org/iacpm_global_srt_bank_survey_2024/

  7. Moody's Ratings, "SRTs to support bank capital despite concentration and regulatory scrutiny" https://dkf1ato8y5dsg.cloudfront.net/uploads/52/504/sector-in-depth-banks-europe-srts-to-support-06may2025-pbc-1441956.pdf

  8. GlobalCapital, "IACPM survey reveals EU banks drove 2024 SRT growth" https://www.globalcapital.com/securitization/article/2f3hwgvondb9sl43mjaww/fig/regulatory-capital/iacpm-survey-reveals-eu-banks-drove-2024-srt-growth

  9. Bloomberg, "What Are Significant Risk Transfers and Why Are Regulators Worried?" https://www.bloomberg.com/news/articles/2025-12-08/srts-what-are-significant-risk-transfers-and-why-are-regulators-worried

  10. AIMA/ACC, "BIS calls for enhanced monitoring of SRT market despite 'modest' risks" https://acc.aima.org/article/bis-calls-for-enhanced-monitoring-of-srt-market-despite-modest-risks.html

Deal Economics and Bank Size

  1. True Sale International, "German Securitisation Platform Final Report" https://www.true-sale-international.de/fileadmin/tsi-gmbh/tsi_downloads/aktuelles/Final_Report_German_Securitisation_Platform_convenience_translation.pdf

  2. British Business Bank, "Securitisation Research" https://www.british-business-bank.co.uk/sites/g/files/sovrnj166/files/2022-11/Securitisation-Research.pdf

  3. AFME, "Myth Busting — Significant Risk Transfer" https://www.afme.eu/media/qa0lhnyq/srtdraftv10.pdf

  4. AFME, "Consultation Response on EU Securitisation Framework" https://www.afme.eu/publications/consultation-responses/targeted-consultation-on-the-functioning-of-the-eu-securitisation-framework/

  5. Bank Policy Institute, "The Economics of Synthetic Risk Transfers" https://bpi.com/wp-content/uploads/2024/12/The-Economics-of-Synthetic-Risk-Transfers.pdf

  6. Bank Policy Institute, "Synthetic Risk Transfer Issue Summary" https://bpi.com/synthetic-risk-transfer-issue-summary/

  7. NPL Markets, "Significant Risk Transfer Update 2024" https://nplmarkets.com/wp-content/uploads/2024/11/Significant-Risk-Transfer-Update-2024-NPLM.pdf

  8. KPMG, "Securitisation and Balance Sheet Optimisation" https://assets.kpmg.com/content/dam/kpmgsites/uk/pdf/2024/05/securitisation-in-balance-sheet-optimisation.pdf.coredownload.inline.pdf

  9. MacKay Shields, "US Banks and SRTs" https://www.nylim.com/assets/mackay-shields/documents/insights/mackay-shields-us-banks-and-srts.pdf

  10. KBRA, "Synthetic Risk Transfer Transactions: A Growing Bank Capital Tool" https://www.kbra.com/publications/fTRsBVQV

  11. True Sale International, "Impact Assessment" (June 2025) https://www.true-sale-international.de/fileadmin/tsi-gmbh/tsi_downloads/aktuelles/2025-06-17_Impact_Assessment.pdf

Regulatory Framework — Europe

  1. ECB, "Guide on the notification of significant risk transfer and implicit support for securitisations" https://www.bankingsupervision.europa.eu/ecb/pub/pdf/ssm.supervisory_guides202512_notification_SRT_securitisations.en.pdf

  2. ECB, "Streamlining Supervision" (December 2025) https://www.bankingsupervision.europa.eu/ecb/pub/html/ssm.streamlining_supervision202512.en.html

  3. ECB Working Paper No. 3210 (Osberghaus, Schepens), "Synthetic, but how much risk transfer?" https://www.ecb.europa.eu/pub/pdf/scpwps/ecb.wp3210~e2dc529b33.en.pdf

  4. PRA, "Supervisory Statement SS9/13: Securitisation: Significant Risk Transfer" (January 2026) https://www.bankofengland.co.uk/-/media/boe/files/prudential-regulation/supervisory-statement/2026/ss913-january-2026-update.pdf

  5. PRA, "Supervisory Statement SS9/13" (July 2025 update) https://www.bankofengland.co.uk/-/media/boe/files/prudential-regulation/supervisory-statement/2025/ss913update-july-2025.pdf

  6. ESRB, "Unveiling the impact of STS on-balance-sheet securitisation on EU financial stability" https://www.esrb.europa.eu/pub/pdf/reports/esrb.report202505_syntheticSTSsecuritisation.en.pdf

  7. Mayer Brown, "ECB Fast-Track for SRT Securitisations" https://www.mayerbrown.com/en/insights/publications/2025/03/ecb-fast-track-for-significant-risk-transfer-srt-securitisations

  8. Mayer Brown, "Proposed Revisions to the EU Securitisation Framework" https://www.mayerbrown.com/en/insights/publications/2025/06/proposed-revisions-to-the-eu-securitisation-framework

  9. Mayer Brown, "Synthetic Risk Transfer (SRT) Transactions in 2026" https://www.mayerbrown.com/-/media/files/perspectives-events/events/2026/01/presentationsynthetic-risk-transfer-srt.pdf

  10. PwC Germany, "New ECB Guide on SRT notifications introduces the Fast-Track process" https://blogs.pwc.de/en/regulatory/article/252858/new-ecb-guide-on-srt-notifications-introduces-the-fast-track-process/

  11. Loomis Sayles, "A Welcome Revival: EU Securitisation Reforms" https://www.loomissayles.com/wp-content/uploads/2025/12/A-Welcome-Revival-EU-Securitisation-Reforms-Final.pdf

  12. AFME, "Response to PRA CP13/24" https://www.afme.eu/publications/consultation-responses/afme-response-to-pra-cp-1324/

Regulatory Framework — United States

  1. Federal Reserve, "Frequently Asked Questions about Regulation Q" https://www.federalreserve.gov/supervisionreg/legalinterpretations/reg-q-frequently-asked-questions.htm

  2. Federal Reserve, "Letter re Ally Financial CLN transaction" (May 2024) https://www.federalreserve.gov/supervisionreg/legalinterpretations/bhc_changeincontrol20240502.pdf

  3. Federal Reserve Bank of Philadelphia, "Synthetic Risk Transfers" (Q3 2025 Economic Insights) https://www.philadelphiafed.org/-/media/FRBP/Assets/Economy/Articles/economic-insights/2025/q3/bt-synthetic-risk-transfers.pdf

  4. Ally Financial, "2Q 2024 Earnings Presentation" https://s2.q4cdn.com/753234398/files/doc_financials/2024/q2/Ally-2Q-2024-Earnings-Presentation.pdf

Investor Dynamics and Platforms

  1. Mayer Brown, "2024 Trends in SRT Transactions" https://www.mayerbrown.com/en/insights/publications/2025/01/2024-trends-in-srt-transactions

  2. Mayer Brown, "Synthetic Risk Transfer SRT in 2025" https://www.mayerbrown.com/en/insights/publications/2025/05/synthetic-risk-transfer-srt-in-2025

  3. Hogan Lovells, "Following the Basel Brick road: Significant risk transfers in 2025" https://www.hoganlovells.com/en/publications/following-the-basel-brick-road-significant-risk-transfers-in-2025

  4. Jones Day, "Basel Committee Publishes Report on Synthetic Risk Transfer Markets" https://www.jonesday.com/en/insights/2026/03/basel-committee-publishes-report-on-synthetic-risk-transfer-markets

  5. CreditSights, "European Banks: SRT Update" https://know.creditsights.com/insights/european-banks-srt-update/

  6. Bloomberg, "ECB Could End Up Imposing 'Soft' SRT Limits, JPMorgan Says" https://www.bloomberg.com/news/articles/2026-03-27/ecb-could-end-up-imposing-soft-srt-limits-jpmorgan-says

  7. KBRA, "Private Credit: U.S. Corporate Synthetic Risk Transfer" https://www.kbra.com/publications/fTRsBVQV

  8. Structured Credit Investor, "CRT Quarterly Research Report" https://www.structuredcreditinvestor.com/CRT-Quarterly-Research/download.asp

Historical Parallels and Academic Research

  1. BIS Quarterly Review full issue (March 2026) https://www.bis.org/publ/qtrpdf/r_qt2603.pdf

  2. Pennacchi, George G.; Santos, João A.C., "Why Do Banks Target ROE?" https://gpennacc.web.illinois.edu/Pennacchi_Santos_25Feb2021.pdf

  3. ECB Working Paper No. 3210 (Osberghaus, Schepens), "Synthetic, but how much risk transfer?" https://www.ecb.europa.eu/pub/pdf/scpwps/ecb.wp3210~e2dc529b33.en.pdf

  4. ESRB Occasional Paper No. 23 (supplementary data) https://www.esrb.europa.eu/pub/pdf/occasional/esrb.op23~07d5c3eef2.en.pdf

  5. BCBS, "Synthetic risk transfers" https://www.bis.org/bcbs/publ/d607.pdf