Banking Law and Ecosystem Banking-Failure Propagation in Spain

Introduction

Ecosystem banking-failure propagation describes how the distress of one bank can spread through the wider financial system. Modern banks are connected with payment institutions, investment firms, insurers, fintech companies, clearing systems, cloud providers, institutional investors and other banks. Consequently, a bank’s failure may disrupt far more than its deposit and lending activities.

Spain experienced this problem during the European sovereign-debt and banking crises. Weaknesses in savings banks, property lending and wholesale funding increased losses across the system. Today, Spanish and European banking law seeks to contain contagion through prudential supervision, recovery planning, resolution mechanisms, deposit protection and operational-resilience requirements.

Legal and Regulatory Framework

Spanish banks are governed principally by Law 10/2014 on the organisation, supervision and solvency of credit institutions. The Bank of Spain monitors solvency, liquidity, governance, asset quality and concentration risk. Significant Spanish banks are supervised directly by the European Central Bank under the Single Supervisory Mechanism.

Law 11/2015 on the recovery and resolution of credit institutions and investment firms implements the European Bank Recovery and Resolution Directive. It provides recovery plans, early-intervention measures, resolution planning, asset separation, bridge institutions, business sales and bail-in powers.

At the European level, the Single Resolution Mechanism Regulation gives the Single Resolution Board responsibility for resolving significant and cross-border banking groups. Spain’s Fund for Orderly Bank Restructuring, known as FROB, acts as the national resolution authority and implements relevant resolution measures.

The Capital Requirements Regulation and Capital Requirements Directive establish capital, liquidity, leverage and large-exposure standards. The Spanish Deposit Guarantee Fund protects eligible deposits up to the applicable statutory limit, generally €100,000 per depositor per institution.

The Digital Operational Resilience Act is also important because banking contagion may result from a shared technology provider, cyberattack or cloud-service failure rather than conventional insolvency.

Channels of Failure Propagation

Interbank and Counterparty Exposures

Banks lend to one another, enter into derivatives and maintain settlement accounts. If one institution defaults, counterparties may suffer losses or face sudden liquidity shortages. Close-out netting and collateral reduce exposure, but simultaneous liquidation may place additional pressure on markets.

Deposit Runs and Loss of Confidence

News concerning one bank may cause customers to withdraw deposits from institutions perceived to have similar weaknesses. Digital banking can accelerate this process because large amounts can be transferred immediately. Deposit insurance reduces panic, but uncertainty about access to funds may still produce short-term liquidity pressure.

Common Asset Holdings

Spanish banks may hold similar government bonds, mortgage assets or corporate loans. When one distressed bank sells assets rapidly, prices may fall. Other banks must then recognise losses or provide additional collateral, even if their own assets have not defaulted. This mechanism is known as a fire-sale externality.

Payment-System Disruption

A failing bank may be an important participant in payment, card, securities-settlement or clearing systems. Its suspension can interrupt payments to businesses and households. Continuity of critical functions is therefore a primary resolution objective.

Banking–Sovereign Relationship

Banks commonly hold domestic sovereign debt, while governments may be expected to support distressed banks. Declining sovereign creditworthiness can reduce the value of banks’ assets, and bank rescues can increase pressure on public finances. European supervision and resolution mechanisms seek to weaken this adverse feedback loop.

Fintech and Operational Dependencies

Several banks may use the same cloud provider, payment processor, identity-verification service or cybersecurity company. Failure of one critical third party may disrupt multiple institutions simultaneously. Concentration mapping, incident reporting, testing and contractual exit rights are therefore essential.

Prevention and Containment Measures

Banks must maintain capital and liquidity buffers capable of absorbing losses. Supervisors use stress testing to examine property-market declines, deposit outflows, interest-rate shocks and counterparty defaults. Countercyclical capital buffers may be increased when excessive credit growth creates system-wide risk.

Each institution must prepare recovery options, including asset sales, capital raising and liquidity conservation. Resolution authorities separately prepare plans for failure without relying on extraordinary public support. Minimum requirements for own funds and eligible liabilities provide instruments that can be written down or converted into capital.

The “no creditor worse off” principle protects creditors against receiving less in resolution than they would have received under normal insolvency proceedings. Resolution action must also respect proportionality, property rights and procedural safeguards.

Relevant Case Laws

1. Kotnik and Others v Državni zbor, Case C-526/14

The Court of Justice upheld, in principle, burden-sharing by shareholders and subordinated creditors before public recapitalisation. The case demonstrates how loss absorption can restrict the transfer of banking losses to taxpayers.

2. Ledra Advertising v European Commission and European Central Bank, Joined Cases C-8/15 P to C-10/15 P

This litigation arose from measures imposed during the Cypriot banking crisis. The Court confirmed that crisis-management institutions must respect fundamental rights, including protection of property, when imposing loss-sharing measures.

3. Aeris Invest v European Commission and Single Resolution Board, Case T-628/17

The case challenged the resolution of Banco Popular Español. The General Court upheld the resolution framework and recognised the need for urgent action where a bank is failing and private alternatives cannot prevent collapse.

4. Algebris and Anchorage Capital v European Commission, Case T-570/17

Investors contested the Banco Popular resolution and its sale to Banco Santander. The case illustrates the treatment of shareholder and creditor interests when authorities intervene to prevent wider financial disruption.

5. Fundación Tatiana Pérez de Guzmán el Bueno and SFL v Single Resolution Board, Case T-481/17

The General Court examined procedural rights and valuation issues arising from Banco Popular’s resolution. It emphasised the specialised and urgent nature of resolution decisions.

6. Del Valle Ruíz and Others v European Commission and Single Resolution Board, Joined Cases T-510/17 and T-561/17

Former Banco Popular investors challenged the legality of the resolution process. The litigation demonstrates the tension between rapid intervention, access to information and effective judicial protection.

7. Banco Santander v J.A.C. and M.C.P.R., Case C-410/20

The Court considered whether investors could pursue liability claims connected with Banco Popular after its resolution and share cancellation. It clarified how resolution measures may affect pre-existing investor remedies.

8. Banca Antoniana Popolare Veneta v Ministero dell’Economia e delle Finanze, Case C-452/18

The Court addressed liability arising from unlawful supervisory decisions in the banking sector. It highlights the importance of lawful and accountable regulatory action when intervention affects financial institutions and investors.

Conclusion

Banking failure in Spain can spread through interbank exposures, depositor behaviour, common assets, payment systems, sovereign links and shared technology providers. Spanish law therefore treats bank resolution as an ecosystem problem rather than the ordinary insolvency of one company.

Capital buffers, liquidity requirements, operational-resilience controls, recovery plans and credible resolution strategies form the main protective structure. The Banco Popular litigation shows that authorities may act rapidly to maintain critical functions and contain contagion, but their decisions remain subject to valuation rules, fundamental rights and judicial review.

This explanation is for educational purposes and does not constitute legal advice.