1. Main Legal Framework

The principal Spanish and EU sources include:

• Law 6/2023 of 17 March on Securities Markets and Investment Services (Ley de los Mercados de Valores y de los Servicios de Inversión).
• Royal Decree 1066/2007 of 27 July on takeover bids for securities, as amended.
• Companies Act, consolidated by Royal Legislative Decree 1/2010.
• Law 10/2014 on the organisation, supervision and solvency of credit institutions.
• Royal Decree 84/2015, implementing important aspects of Law 10/2014.
• The EU Capital Requirements Directive (CRD) framework.
• Regulation (EU) No 1024/2013, establishing the Single Supervisory Mechanism (SSM).
• Law 15/2007 on Defence of Competition.
• EU merger-control rules where the relevant jurisdictional thresholds are met.

For listed-bank takeovers, the CNMV, ECB, Banco de España, and potentially Spanish or EU competition authorities can therefore all have important roles.

2. What Is a Takeover Bid?

A takeover bid—an oferta pública de adquisición or OPA in Spain—is a public offer to acquire shares or other relevant securities from the holders of a company.

There are two basic forms.

Voluntary OPA: The bidder voluntarily makes an offer, normally as part of a strategy to acquire control.

Mandatory OPA: Spanish law requires an offer after specified circumstances giving control arise.

For banks, these securities-law concepts operate alongside separate prudential rules governing who is allowed to own significant interests in credit institutions.

3. Mandatory Takeover Bid

Spanish takeover law generally requires a person who obtains control of a listed company to make a mandatory bid for the company's securities on the terms required by law.

For this purpose, control is principally associated with reaching or exceeding 30% of the voting rights, or with obtaining a lower holding while appointing, within the legally relevant period, a number of directors which, together with those already appointed by the acquirer, represents more than half of the board.

This prevents an acquirer from gaining effective control without giving remaining shareholders an opportunity to exit.

A simplified example:

Investor X owns 22% of Bank A.

X acquires another 10%.

Its holding becomes 32%.

Subject to the detailed rules and available exemptions, the acquisition of control can trigger the obligation to launch a mandatory OPA.

4. Why the 30% Threshold Is Not the Only Banking Threshold

This is crucial in bank acquisitions.

The takeover-law threshold and banking prudential thresholds perform different functions.

Under the prudential framework, acquisitions of qualifying holdings in credit institutions can require prior assessment well below 30%.

A qualifying holding is generally a direct or indirect holding representing 10% or more of capital or voting rights, or otherwise enabling the holder to exercise significant influence.

Further regulatory thresholds are relevant when a holding reaches or exceeds levels such as:

20% → 30% → 50% → control/subsidiary status.

Therefore, an investor may need banking supervisory approval even though no mandatory OPA has yet arisen.

5. ECB and Banco de España

Under the Single Supervisory Mechanism, the ECB has an important role in assessing acquisitions of qualifying holdings in euro-area credit institutions.

Banco de España participates through the national supervisory framework and procedures established under EU and Spanish law.

The assessment considers matters such as:

• reputation of the proposed acquirer;
• reputation, knowledge and experience of proposed management;
• financial soundness of the acquirer;
• continued prudential compliance by the target bank;
• group structure and effective supervision; and
• risks relating to money laundering or terrorist financing.

The fundamental question is not simply:

“Can this investor afford the shares?”

It is also:

“Would this ownership structure remain compatible with safe and sound management of the bank?”

6. CNMV's Role

The Comisión Nacional del Mercado de Valores (CNMV) administers Spain's takeover-bid regime for listed companies.

Its functions include reviewing takeover documentation and supervising compliance with takeover rules.

The process involves matters such as:

• announcement of the offer;
• filing of documentation;
• offer consideration;
• guarantees;
• authorisation;
• publication of the prospectus;
• acceptance period;
• competing bids; and
• settlement.

In a listed-bank transaction, CNMV approval of the takeover process does not substitute for banking supervisory approval.

7. Equitable Price

Mandatory takeover bids generally have to comply with the equitable-price principle.

Broadly, the mandatory bid price is connected to the highest price paid or agreed by the bidder, or persons acting in concert with it, for the relevant securities during the legally specified period preceding the bid.

The purpose is straightforward.

Suppose the bidder privately pays:

€12 per share

to acquire a strategic block and thereby obtains control.

It should not normally be able immediately to offer minority shareholders:

€8 per share

under a mandatory takeover bid.

The equitable-price mechanism is designed to protect shareholders against such unequal treatment.

8. Acting in Concert

Takeover regulation cannot operate effectively if several investors can simply divide a controlling position among themselves.

Spanish rules therefore take account of persons acting in concert.

Example:

Investor A → 12%
Investor B → 11%
Investor C → 9%

Individually, none owns 30%.

Together they own 32%.

If A, B and C have an agreement or understanding that legally constitutes concerted action for purposes of obtaining control, their voting rights may be aggregated under the takeover rules.

This is particularly important for banking acquisitions involving investment funds, shareholders' agreements or complex corporate structures.

9. Indirect Control

A takeover obligation cannot necessarily be avoided by acquiring the bank through another company.

Suppose Company X controls Holding Company Y.

Y acquires control of Listed Bank Z.

Spanish takeover rules contain provisions addressing indirect and supervening acquisitions of control.

The law therefore examines the substance of control, rather than only the immediate registered shareholder.

10. Voluntary Takeover Bids

An investor may launch a voluntary bid before obtaining control.

Voluntary bids can generally be structured with greater flexibility than mandatory bids and may potentially contain conditions, subject to Spanish takeover rules.

Typical conditions may concern:

• minimum acceptance;
• regulatory authorisation;
• competition clearance; or
• other legally permitted conditions.

For a bank acquisition, regulatory conditions can be crucial because the bidder should not obtain banking control without the required prudential approvals.

11. Target Bank Board

Once a takeover bid has been launched, management cannot treat the target company as though nothing has changed.

Spanish takeover rules restrict actions capable of frustrating the bid, subject to the applicable statutory framework and shareholder authorisation rules.

This is related to the board-neutrality/passivity principle.

Management should not improperly deprive shareholders of the opportunity to decide whether they want to accept the offer.

At the same time, directors remain subject to their corporate-law duties.

12. Competing Bids

Spanish takeover law permits competing offers under regulated conditions.

Suppose:

Bidder A offers €8.50 per share.

Bidder B later offers €9.20.

A competitive process may increase shareholder value, but both bidders remain subject to takeover rules governing timing, modifications, information and conditions.

In banking transactions, each bidder may separately need to satisfy prudential ownership requirements.

The highest financial offer is therefore not necessarily the bidder that ultimately receives banking regulatory approval.

13. Squeeze-Out and Sell-Out

After a successful takeover, very high ownership levels can activate mechanisms allowing the remaining shares to be acquired or requiring the dominant shareholder to purchase them.

Spain implements squeeze-out and sell-out mechanisms derived from the EU Takeover Directive.

Broadly, the statutory framework can become available where, following a bid for all the securities, the bidder reaches at least 90% of the voting rights and the offer has been accepted by holders representing at least 90% of the voting rights to which the offer was addressed, subject to the detailed statutory conditions.

These mechanisms allow the bidder to complete ownership while also protecting remaining shareholders through corresponding exit rights.

14. Competition Law

A banking takeover may also constitute a concentration under competition law.

Relevant authorities can include:

CNMC — Spanish competition authority.

European Commission — where EU merger-control jurisdiction applies.

Competition authorities may examine issues such as:

• market concentration;
• reduced consumer choice;
• geographic overlap;
• SME lending;
• payment services;
• deposit markets; and
• barriers to entry.

Thus:

CNMV → takeover law

ECB/Banco de España → prudential ownership

CNMC/European Commission → competition

A major banking takeover may need to pass all three regulatory layers.

15. Foreign Investment Screening

Where the bidder is a foreign investor, Spain's foreign direct-investment screening framework may also require analysis.

This can be especially relevant because banking and financial infrastructure may have strategic significance.

The exact requirement depends on matters including:

• identity of the investor;
• ownership/control structure;
• target activity;
• size of investment; and
• applicable Spanish and EU screening rules.

Consequently, a non-EU bidder may face an additional regulatory layer beyond ordinary takeover law.

16. Confidential Information and Market Abuse

Takeover negotiations frequently involve highly price-sensitive information.

The EU Market Abuse Regulation (MAR) is therefore important.

Potential bidders, advisers, banks and target directors need controls addressing:

• inside information;
• confidentiality;
• insider lists;
• unlawful disclosure;
• market manipulation; and
• insider dealing.

For example, an executive who secretly purchases target-bank shares after learning about an imminent premium takeover bid could face serious market-abuse consequences.

17. Financing the Bid

The bidder must demonstrate that the takeover consideration can actually be paid.

Spanish takeover regulation contains requirements concerning guarantees for the consideration.

If the offer is financed through debt, the acquisition structure must also account for:

• acquisition financing;
• security arrangements;
• capital requirements;
• leverage;
• financial-assistance restrictions where relevant; and
• prudential implications.

For bank acquisitions, excessive leverage at the acquiring shareholder level can also become relevant to the prudential assessment of the acquirer's financial soundness.

18. Special Position of Bank Mergers

A takeover bid should not be confused with a statutory merger.

A bank consolidation can occur through:

Takeover: one investor acquires the target's shares.

Merger: corporate entities combine under merger legislation.

Business transfer: specified assets and liabilities are transferred.

Resolution transaction: authorities restructure or transfer a failing institution under bank-resolution law.

Different legal procedures and shareholder protections apply.

This distinction became especially important during European banking crises, where restructuring sometimes occurred through resolution mechanisms rather than ordinary takeover bids.

Important Case Laws

1. Commission v Spain — CJEU, Case C-463/00, 13 May 2003

This important judgment concerned Spanish rules allowing public authorities special powers over certain privatised companies—the so-called golden-share problem.

The CJEU found that aspects of the Spanish regime constituted restrictions on the free movement of capital.

Importance for bank takeovers: Spain cannot impose unjustified restrictions on cross-border investment merely because an acquisition involves a strategically important company. Restrictions must comply with EU fundamental freedoms and proportionality.

2. Commission v Portugal — CJEU, Case C-367/98, 4 June 2002

Portugal maintained special rights relating to privatised companies.

The Court found restrictions inconsistent with EU free-movement-of-capital rules.

Spanish banking relevance: National strategic interests do not automatically justify barriers to EU investment. Regulatory intervention in bank ownership needs a legally defensible basis.

3. Commission v France — CJEU, Case C-483/99, 4 June 2002

The case involved special state rights affecting investments in Elf Aquitaine.

The Court again examined national restrictions under EU capital-movement principles.

Relevance: Government powers capable of discouraging investment or affecting corporate control can fall within EU scrutiny.

4. Commission v Belgium — CJEU, Case C-503/99, 4 June 2002

Unlike several other golden-share cases, certain Belgian measures were accepted because they were more narrowly structured around legitimate public-interest concerns.

Importance: Restrictions relating to strategically important businesses are not automatically unlawful. The decisive issues include justification, necessity and proportionality.

For banking regulation, this supports the broader idea that financial-stability controls can be legitimate when appropriately designed.

5. Commission v Germany (Volkswagen Law) — CJEU, Case C-112/05, 23 October 2007

The Court considered special corporate-control arrangements protecting Volkswagen from ordinary takeover dynamics.

It held that the combined state-protection arrangements restricted the free movement of capital.

Relevance to Spain: National corporate structures cannot ordinarily be designed simply to deter potential cross-border acquirers contrary to EU law.

6. SCA Group Holding and Others — CJEU, Joined Cases C-39/13, C-40/13 and C-41/13

Although primarily a tax/group-law case rather than a takeover case, it reinforces the broader EU principle that ownership structures involving companies established in different Member States cannot be disadvantaged without adequate justification.

Comparative relevance: Banking acquisition structures must be analysed within EU freedom-of-establishment principles as well as domestic company law.

19. Banco Sabadell–BBVA: Modern Spanish Example

A particularly useful practical example is BBVA's bid for Banco Sabadell, launched in 2024.

The transaction demonstrated how many regulatory regimes can operate simultaneously in a major Spanish banking takeover.

The proposed transaction engaged questions concerning:

• CNMV takeover supervision;
• ECB prudential approval;
• competition review;
• shareholder decision-making;
• banking concentration;
• SME lending;
• regional banking markets; and
• potential governmental powers concerning a subsequent corporate merger.

The episode illustrates an important distinction:

Acquiring control through an OPA and subsequently merging the two banks are legally distinct steps.

Regulatory approval of one stage does not automatically guarantee approval of every later restructuring measure.

20. Hypothetical Example

Assume European Bank A wants to acquire Spanish Listed Bank B.

Bank A first purchases 12%.

Stage 1 — Prudential review

Because the investment reaches the qualifying-holding threshold, banking supervisory requirements must be considered.

It does not need to wait until 30%.

Bank A later increases its stake to 31%.

Stage 2 — Takeover law

The control threshold is now potentially crossed, triggering mandatory takeover requirements unless an exemption or other special rule applies.

Stage 3 — CNMV

The takeover documentation, consideration, guarantees and procedure fall within CNMV supervision.

Stage 4 — Competition

If the transaction meets relevant thresholds, CNMC or the European Commission reviews its effect on competition.

Stage 5 — Other approvals

Foreign-investment screening, sector-specific issues or other regulatory requirements may also apply.

The acquisition therefore cannot be reduced to a single shareholder vote.

21. Regulatory Matrix

This multi-authority structure is the defining feature of Spanish bank takeovers.

22. Core Legal Principles

Several principles emerge from the framework.

Equal treatment: Shareholders in equivalent positions should receive appropriate equal treatment.

Minority protection: Obtaining control should not unfairly trap minority investors.

Transparency: The market must receive legally required information about the bid.

Equitable consideration: Mandatory offers are subject to price-protection rules.

Prudential suitability: Ownership of a bank requires regulatory confidence in the acquirer.

Financial stability: A transaction cannot be assessed solely by the price offered to shareholders.

Competition: Consolidation must not unlawfully damage market competition.

EU freedoms: National restrictions on acquisitions must respect EU law.

Conclusion

Banking Law and Takeover Bid Regulation in Spain operates through two overlapping control systems.

The first is securities-market takeover regulation, principally administered by the CNMV under Spain's securities legislation and Royal Decree 1066/2007. It addresses control, mandatory bids, equitable price, shareholder protection, competing offers and takeover procedures.

The second is prudential banking supervision. An investor acquiring a qualifying holding—generally beginning at 10% or significant influence—may require regulatory assessment well before reaching the takeover-law control threshold. Within the Banking Union, the ECB and Banco de España play central roles in this process.

Competition control, market-abuse law, corporate governance and potentially foreign-investment screening add further layers.

The EU cases Commission v Spain, Commission v Portugal, Commission v France, Commission v Belgium,* and *Commission v Germany establish an important background principle: Member States may protect legitimate public interests, including financial stability, but restrictions affecting corporate control and cross-border investment must comply with EU law and proportionality.

Accordingly, a Spanish bank takeover is never simply a question of who offers the highest price. The bidder must also establish that the acquisition respects minority-shareholder rights, market integrity, competition, prudential suitability and the stability of the banking system.