Banking Law and Regulatory Appeals in Spain

1. Introduction

Regulatory appeals in Spanish banking law are the procedures through which banks, payment institutions, investment firms, managers, shareholders, customers, or other affected persons may challenge decisions made by banking and financial regulators.

Because Spain participates in the EU Banking Union, regulatory appeals can arise at several levels:

• Banco de España;
• European Central Bank (ECB) under the Single Supervisory Mechanism;
• CNMV for securities-related matters;
• FROB/SRB in bank-resolution matters;
• Spanish administrative authorities; and
• Spanish or EU courts.

The applicable route depends on which authority adopted the decision, the legal basis of the decision, and who is challenging it.

The right to challenge regulatory action is important because banking regulators possess substantial powers concerning licensing, capital, governance, sanctions, acquisitions, supervision and resolution.

2. What Decisions Can Produce Regulatory Appeals?

Examples include decisions concerning:

• refusal or withdrawal of banking authorization;
• administrative sanctions;
• governance requirements;
• qualifying holdings;
• prudential capital requirements;
• supervisory measures;
• fit-and-proper assessments;
• payment-service authorization;
• resolution measures;
• market-conduct enforcement; and
• disclosure or reporting requirements.

Not every supervisory communication is necessarily an independently appealable administrative act. The legal character and effects of the measure must be examined.

3. Spanish Banking Supervisory Structure

A simplified structure is:

EU banking legislation
↓
ECB / Single Supervisory Mechanism
↓
Banco de España
↓
Spanish banks

For significant credit institutions, the ECB has direct supervisory responsibilities under the SSM framework.

Banco de España continues to play important roles, including within joint supervisory structures and regarding institutions or matters falling within its competence.

This creates an important question in every appeal:

Who legally made the contested decision?

The answer can determine the correct appeal route.

4. Main Spanish Administrative Framework

Spanish administrative action is principally governed by:

• Law 39/2015 on the Common Administrative Procedure of Public Administrations; and
• Law 40/2015 on the Legal Regime of the Public Sector.

Judicial review is principally governed by:

• Law 29/1998 regulating the Contentious-Administrative Jurisdiction.

Banking-specific legislation, including Law 10/2014 on the regulation, supervision and solvency of credit institutions, must be read alongside these general administrative-law rules.

5. Administrative Appeal Versus Judicial Review

Two concepts should be distinguished.

Administrative review

A decision may first be challenged through an administrative procedure where the applicable law provides such a route.

Judicial review

The affected party can ultimately seek review before the competent court when the legal requirements are satisfied.

The structure can therefore resemble:

Regulatory decision
↓
Administrative/internal review where applicable
↓
Contentious-administrative judicial proceedings

For ECB decisions, the EU-level route is different.

6. Banco de España Decisions

Banco de España exercises public-law supervisory powers.

Depending on the specific decision and statutory framework, an affected institution may challenge an administrative act using the procedures established by Spanish law.

Potential grounds can include:

• lack of competence;
• procedural irregularity;
• inadequate reasoning;
• error of law;
• factual error;
• disproportionality;
• infringement of fundamental rights; or
• misuse of powers.

Courts do not simply substitute themselves for the banking supervisor on every technical matter. But supervisory discretion remains subject to law.

7. Requirement to Give Reasons

Reasoned decision-making is fundamental to effective review.

Suppose a regulator states:

“Bank A must hold significantly more capital because its risk is unacceptable.”

For meaningful judicial review, the institution may need sufficient reasoning to understand:

• the legal basis;
• relevant facts;
• methodology;
• supervisory concerns; and
• measure imposed.

Reasoning protects against arbitrary administrative action and enables an affected institution to formulate an effective challenge.

8. Right to Be Heard

Where required by applicable procedure, an affected party must have an opportunity to present its position before an adverse decision becomes final.

For example:

Supervisor identifies problem
↓
Bank receives allegations/findings
↓
Bank submits observations
↓
Authority considers response
↓
Final decision

The precise procedure depends on the type of measure, including whether urgent action is legally authorized.

9. Access to the File

Effective defense may require access to relevant material in the administrative file, subject to lawful restrictions.

Banking supervision presents special difficulties because files can contain:

• confidential supervisory information;
• customer information;
• business secrets;
• third-party information; and
• financial-stability-sensitive material.

Therefore, procedural rights may need to be balanced against legally protected confidentiality.

10. Proportionality

The principle of proportionality is especially important in regulatory appeals.

A supervisory measure should not go beyond what is legally justified for the regulatory objective.

For example:

Minor reporting error

should not automatically produce

the most severe available sanction

without consideration of relevant statutory factors.

Courts can examine whether an authority applied the applicable proportionality requirements.

11. Sanctions

Banking sanctions can affect:

• the bank;
• directors;
• senior managers;
• shareholders; or
• other responsible persons.

Possible consequences can include:

• fines;
• public sanctions;
• governance restrictions;
• disqualification consequences where authorized; and
• other corrective measures.

Because sanctions can have serious consequences, procedural guarantees are particularly important.

12. Presumption of Innocence in Administrative Sanctions

Punitive administrative proceedings engage important procedural protections.

The regulator must establish the infringement according to the applicable legal standards.

The institution should be able to challenge:

• evidence;
• factual findings;
• attribution of responsibility;
• legal classification; and
• sanction proportionality.

RegTech or automated supervisory analysis can provide evidence, but an algorithmic alert alone should not be confused with proof of an infringement.

13. ECB Supervisory Decisions

Spain's participation in the Single Supervisory Mechanism (SSM) means some of the most important decisions affecting Spanish banks are legally decisions of the ECB.

These can concern:

• capital;
• authorization;
• qualifying holdings;
• governance;
• supervisory measures; and
• sanctions within the ECB's competence.

Challenges to such decisions generally belong within the EU legal system, rather than ordinary Spanish administrative review.

14. ECB Administrative Board of Review

The SSM framework created the Administrative Board of Review (ABoR).

A person or entity directly and individually concerned by an ECB supervisory decision may, subject to the governing rules, request administrative review.

The ABoR examines the decision's procedural and substantive conformity with the SSM Regulation.

The review does not replace the right to seek judicial review before EU courts.

Thus:

ECB decision
↓
ABoR review where used/available
↓
ECB follow-up decision

and independently within the EU judicial framework:

ECB decision → General Court → Court of Justice on points of law.

15. Case: Landeskreditbank Baden-Württemberg v ECB, C-450/17 P

Landeskreditbank Baden-Württemberg v ECB, C-450/17 P is a major SSM judgment.

The dispute concerned whether a bank classified as significant could be treated as less significant because of particular circumstances.

The Court of Justice upheld the ECB-centered interpretation of the SSM framework.

Importance for Spain

A Spanish bank challenging its supervisory treatment under the SSM cannot treat ECB powers as though they were merely delegated national powers.

The case clarifies the structure of authority within the Banking Union.

16. Case: Crédit Mutuel Arkéa v ECB

Crédit Mutuel Arkéa v ECB, including the litigation in Cases T-712/15 and T-52/16, concerned ECB prudential supervision and the treatment of a banking group.

Importance

The litigation demonstrates that ECB supervisory decisions can be challenged before the EU courts.

The courts can examine:

• legal basis;
• interpretation of prudential rules;
• reasoning; and
• supervisory powers.

This is directly relevant to Spanish significant institutions subject to ECB supervision.

17. Case: Berlusconi and Fininvest, C-219/17

Berlusconi and Fininvest, C-219/17 is one of the most important Banking Union judicial-review cases.

It concerned a procedure involving the acquisition of a qualifying holding where national authorities participated in a process culminating in an ECB decision.

The CJEU held, in substance, that where the final legally binding decision belongs to the ECB within such a composite procedure, review belongs to the EU courts, including examination of defects affecting preparatory national acts where appropriate.

Spanish importance

This is crucial because Banking Union procedures often involve:

Banco de España → preparatory work/proposal → ECB → final decision.

A claimant must identify the legal source of the final decision rather than automatically challenging the national preparatory measure before a Spanish court.

18. Composite Administrative Procedures

Banking Union supervision frequently creates composite procedures involving national and EU authorities.

Example:

Spanish investor seeks qualifying holding in Bank X.

Investor application

↓

Banco de España assessment

↓

ECB decision

If the ECB is legally responsible for the final decision, Berlusconi and Fininvest indicates the importance of EU judicial review.

This prevents contradictory national and EU judgments concerning a single decision-making process.

19. Case: Trasta Komercbanka v ECB

The Trasta Komercbanka litigation concerned withdrawal of a bank's authorization and questions of standing to challenge an ECB decision.

The Court of Justice's judgment in joined appeals C-663/17 P, C-665/17 P and C-669/17 P addressed important procedural questions.

Spanish relevance

The case demonstrates that:

• bank licensing decisions are reviewable;
• standing must be carefully determined; and
• the legal position of shareholders may differ from that of the bank itself.

A shareholder cannot automatically assume that every regulatory measure affecting the bank can be challenged personally.

20. Standing

Standing is therefore a central issue.

Potential claimants include:

• regulated bank;
• shareholder;
• director;
• acquirer;
• customer; or
• competitor.

But each claimant must establish the legally required connection to the contested act.

The fact that a regulatory decision economically affects someone does not always mean that person has standing to challenge it.

21. Banking Authorization

Authorization decisions are among the most important supervisory acts.

A refusal can prevent a company from operating as a bank.

A withdrawal can effectively terminate banking activity.

Accordingly, review may examine:

• statutory authorization conditions;
• governance;
• capital;
• qualifying shareholders;
• business model;
• management suitability; and
• procedural fairness.

The supervisor still possesses technical expertise, but licensing decisions remain legally reviewable.

22. Fit-and-Proper Decisions

Bank directors and senior managers can be assessed for suitability.

Factors can include:

• reputation;
• knowledge;
• experience;
• skills;
• independence considerations; and
• ability to commit sufficient time.

A negative assessment can significantly affect an individual's career.

Such decisions therefore require appropriate legal basis, evidence and procedure.

23. Qualifying Holdings

A person seeking to acquire a significant interest in a Spanish bank may be subject to prudential assessment.

The authorities can examine factors such as:

• reputation of the acquirer;
• financial soundness;
• future compliance of the bank;
• management implications; and
• money-laundering concerns.

Berlusconi and Fininvest is especially important for understanding the appeal route where the ECB ultimately adopts the decision.

24. Confidentiality and Appeals

Banking supervision depends heavily on confidential information.

An appellant might demand disclosure of the entire supervisory file.

However, EU and Spanish banking law protect certain confidential information.

Courts may therefore need to balance:

rights of defense

against

supervisory confidentiality and third-party rights.

Confidentiality cannot automatically eliminate effective judicial protection, but neither does an appeal automatically make every supervisory document public.

25. Case: Baumeister, C-15/16

Baumeister, C-15/16 concerned professional secrecy under EU financial-supervision legislation.

The CJEU considered the meaning of confidential information held by financial supervisory authorities.

Relevance to Spain

The case is useful when regulatory appeals involve requests for access to supervisory information.

Not every document held by a regulator is automatically permanently confidential, but protected supervisory information receives significant legal protection.

26. Effective Judicial Protection

Article 47 of the EU Charter of Fundamental Rights guarantees the right to an effective remedy and a fair hearing within the scope of EU law.

This is particularly important in banking supervision because regulators can make decisions with enormous economic consequences.

Effective protection can require:

• access to a tribunal;
• sufficient reasons;
• ability to present arguments;
• review of relevant evidence; and
• meaningful judicial scrutiny.

27. Case: Unibet, C-432/05

Unibet, C-432/05 concerned effective judicial protection under EU law.

It was not a banking case, but it established important principles concerning access to effective remedies.

Banking relevance

Spanish procedural rules governing challenges to banking regulation must operate consistently with EU effective-remedy requirements when EU rights are engaged.

28. Case: Borelli, C-97/91

Oleificio Borelli v Commission, C-97/91 is a foundational case concerning composite administrative procedures.

It involved a national preparatory act feeding into an EU decision-making process.

Banking relevance

Borelli provides historical context for the later development of judicial review in composite EU procedures.

However, Berlusconi and Fininvest is especially important in Banking Union cases where the ECB itself has final decision-making authority.

29. Bank Resolution Appeals

Supervision should also be distinguished from resolution.

When a bank is failing or likely to fail, resolution authorities can potentially use extraordinary powers under the applicable framework.

For Spanish banks, this can involve:

• Single Resolution Board (SRB);
• FROB;
• European Commission/Council roles where applicable; and
• national implementation of the Bank Recovery and Resolution Directive.

Resolution decisions can have enormous consequences for:

• shareholders;
• bondholders;
• depositors;
• creditors; and
• counterparties.

30. Banco Popular Resolution

The 2017 resolution of Banco Popular Español generated extensive litigation before EU courts.

The SRB adopted the resolution scheme and Banco Santander acquired Banco Popular.

Numerous shareholders and creditors challenged aspects of the resolution.

This litigation has become one of the most important sources for understanding judicial review of Banking Union resolution decisions affecting a Spanish bank.

31. Case: Aeris Invest v Commission and SRB, T-628/17

Aeris Invest v Commission and SRB, T-628/17 arose from the Banco Popular resolution.

The General Court examined challenges relating to the resolution process.

Importance

The case demonstrates that extraordinary bank-resolution decisions remain subject to judicial review, even though resolution authorities operate under severe time pressure and highly technical conditions.

However, courts also recognize the complex economic assessments involved.

32. Case: Algebris and Anchorage v Commission, T-570/17

Algebris (UK) Ltd and Anchorage Capital Group LLC v Commission, T-570/17 also concerned Banco Popular's resolution.

The applicants challenged EU actions connected with the resolution.

Importance

The litigation illustrates the difficult interaction between:

• financial-stability objectives;
• valuation;
• creditor/shareholder losses;
• resolution discretion; and
• judicial protection.

33. Case: Fundación Tatiana Pérez de Guzmán el Bueno and SFL v SRB, T-481/17

This was another challenge arising from Banco Popular's resolution.

It forms part of the broader body of EU litigation concerning the legality and procedural structure of the resolution.

Importance

Together, these cases demonstrate that Spanish banking regulatory disputes can ultimately be litigated before EU courts where decisions originate from Banking Union institutions.

34. Valuation Disputes

Resolution cases frequently involve disagreement about valuation.

For example:

Bank assets estimated by shareholders:

€20 billion net value.

Resolution authority's stressed valuation:

far lower.

The difference can determine whether:

• equity is written down;
• creditors suffer losses; or
• resolution action is justified.

Courts can review legality and procedure, but valuation often involves complex technical and economic judgment.

35. Interim Measures

A bank may seek temporary judicial protection while an appeal is pending.

But suspension of a regulatory measure is not automatic.

Courts may consider factors such as:

• urgency;
• serious and irreparable harm;
• prima facie legal arguments; and
• public interest.

In banking cases, financial stability can weigh heavily because delaying a necessary supervisory or resolution measure could affect depositors and markets.

36. Appeal Does Not Automatically Suspend Regulation

This is particularly important.

Suppose the ECB orders Bank A to increase capital.

Bank A challenges the decision.

The institution generally cannot simply assume:

“Because we appealed, we may ignore the decision.”

The legal effect of the challenged measure and any suspension must be determined under the applicable procedural rules.

Otherwise, appeals could undermine effective prudential supervision.

37. Standard of Judicial Review

Banking regulation often involves complex assessments concerning:

• capital;
• liquidity;
• valuation;
• credit risk;
• governance;
• stress tests; and
• financial stability.

Courts generally review whether the regulator:

• acted within its legal powers;
• followed required procedure;
• correctly interpreted the law;
• relied on sufficiently established facts;
• provided adequate reasoning; and
• respected proportionality and fundamental rights.

The court is not normally transformed into a banking supervisor.

38. Regulatory Discretion Is Not Unlimited

Technical discretion does not mean legal immunity.

A regulator cannot lawfully say:

“This is a technical banking matter, therefore courts cannot review it.”

Judicial review remains available according to the applicable jurisdictional framework.

The intensity of review may depend on the nature of the decision and the degree of technical judgment involved.

39. Spanish Versus EU Appeal Route

A practical classification is:

Identifying the actual author of the final legally binding act is essential.

40. Important Case Laws

At least eight cases are particularly useful for studying regulatory appeals affecting Spanish banking:

1. Landeskreditbank Baden-Württemberg v ECB, C-450/17 P

Clarified ECB supervisory authority and the SSM structure.

2. Berlusconi and Fininvest, C-219/17

Extremely important for judicial review of composite national/ECB banking procedures.

3. Trasta Komercbanka v ECB, Joined Cases C-663/17 P, C-665/17 P and C-669/17 P

Important for authorization withdrawal, standing and judicial review.

4. Crédit Mutuel Arkéa v ECB, T-712/15 and T-52/16

Review of ECB prudential-supervision decisions.

5. Baumeister, C-15/16

Supervisory confidentiality and access to information.

6. Oleificio Borelli v Commission, C-97/91

Foundational authority on judicial protection in composite administrative procedures.

7. Aeris Invest v Commission and SRB, T-628/17

Judicial challenge arising from Banco Popular's resolution.

8. Algebris and Anchorage v Commission, T-570/17

Resolution litigation concerning Banco Popular.

9. Fundación Tatiana Pérez de Guzmán el Bueno and SFL v SRB, T-481/17

Further judicial review of the Banco Popular resolution process.

10. Unibet, C-432/05

General EU principle of effective judicial protection.

Some of these are direct banking cases; Borelli and Unibet are broader EU administrative-law authorities used for the governing procedural principles.

41. Example: Capital Requirement Appeal

Suppose the ECB determines that a significant Spanish bank has serious concentration risk.

It imposes an additional prudential requirement.

The bank believes:

• the data were incorrect;
• certain collateral was ignored;
• its submissions were misunderstood; and
• the measure is disproportionate.

The bank can formulate its challenge around the legal and factual deficiencies it alleges.

The dispute might examine:

ECB competence → procedure → evidence → methodology → reasoning → proportionality.

But the existence of the challenge does not itself establish that the supervisor's assessment was wrong.

42. Example: Acquisition of Spanish Bank

Investor X wants to acquire 30% of Bank Y.

The process involves:

Investor X

↓

Banco de España / national assessment

↓

ECB

↓

final qualifying-holding decision.

If the ECB ultimately rejects the acquisition, Berlusconi and Fininvest is critical for determining judicial jurisdiction.

The appropriate challenge is not necessarily a separate Spanish action against every preparatory step.

43. Example: Regulatory Sanction

Banco de España imposes a sanction after finding serious governance failures.

The bank argues:

1. the regulator misunderstood the facts;
2. important evidence was ignored;
3. the infringement was incorrectly classified;
4. the sanction was disproportionate; and
5. procedural rights were violated.

The reviewing authority or court can examine these arguments under the applicable Spanish legal framework.

The purpose of judicial review is not to supervise the bank itself but to determine whether the regulator acted lawfully.

44. Key Principles of Spanish Banking Regulatory Appeals

The framework can be reduced to several core principles:

Legality: supervisory authorities must act within statutory powers.

Competence: the correct Spanish or EU authority must adopt the decision.

Reasoning: material decisions should contain sufficient legal and factual justification.

Defense rights: affected parties must receive applicable procedural protections.

Proportionality: regulatory measures must comply with proportionality requirements.

Confidentiality: supervisory information remains protected where the law requires.

Effective judicial protection: regulated entities must have access to an effective legal remedy.

Financial stability: appeal procedures must not make urgent prudential intervention impossible.

Conclusion

Regulatory appeals in Spanish banking law operate through both Spanish administrative law and the EU Banking Union system. Determining the correct appeal route requires identifying who adopted the legally binding decision.

For national measures, Law 39/2015, Law 29/1998 and banking-specific legislation such as Law 10/2014 provide important parts of the framework. Decisions of the ECB, however, are reviewed within the EU legal system, potentially involving the Administrative Board of Review, General Court and Court of Justice.

The leading cases demonstrate different aspects of this architecture. Landeskreditbank explains the structure of ECB supervision; Berlusconi and Fininvest is central to composite national/ECB procedures; Trasta Komercbanka addresses licensing and standing; Crédit Mutuel Arkéa demonstrates review of prudential decisions; Baumeister addresses supervisory confidentiality; and the Aeris Invest, Algebris/Anchorage and Fundación Tatiana litigation illustrates judicial review following the resolution of Spain's Banco Popular.

The central principle is that banking supervisors require substantial powers to protect depositors and financial stability, but those powers remain subject to law and judicial review. Regulatory appeals provide the mechanism for testing competence, procedure, evidence, reasoning, proportionality and respect for protected rights without converting the courts themselves into day-to-day banking supervisors.