Antitrust Collective Redress in Spain: Testing the System Through the Automobile Cartel Litigation

Spain has become one of Europe's leading laboratories for cartel damages litigation without ever developing an effective collective redress mechanism. While the country still awaits the full implementation of the Representative Actions Directive, the ongoing automobile cartel damages litigation already reveals the shortcomings of the existing system. It is not simply that the current mechanisms are inefficient, their complexity may itself become a litigation asset for defendants. The seven collective claims filed by the Spanish Consumers' Organisation (OCU) expose a paradox at the heart of Spanish collective redress: a system that generates procedural complexity before judgment and individualized enforcement after judgment.

The paradox of Spain's private enforcement success story

Spain’s experience with private antitrust enforcement is paradoxical. Over the last decade, the country has become one of the most active jurisdictions in Europe for cartel damages litigation.

The trucks cartel generated tens of thousands of claims, well over six thousand appellate judgments and almost two hundred judgments by the Supreme Court. The automobile cartel is now producing an even larger wave of mass litigation (see Kluwer Competition Blog 31/1/23).

Yet this remarkable development has occurred without an effective system of collective redress. As a result, one of the largest episodes of cartel damages litigation in Europe has been processed almost entirely through individual claims.

Spain does have procedural mechanisms for collective actions. However, they were not designed with modern mass damages litigation in mind. Their scope is limited, their operation is cumbersome, and they have rarely been used successfully in competition law disputes (for an unsuccessful attempt, see ES:APM:2013:2461A). More importantly, the complexity of the existing framework may itself become a source of strategic advantage for defendants, generating procedural disputes that undermine the very efficiency gains collective litigation is supposed to achieve.

Against that background, the seven collective actions brought by the Spanish Consumers' Organisation (OCU) in relation to the automobile cartel provide a unique opportunity to test the strengths and weaknesses of the current model. Whatever their ultimate outcome, these proceedings already reveal the structural shortcomings of Spanish collective redress and raise broader questions about the implementation of the 2018 Representative Actions Directive. The central argument of this post is that the current legal framework appears better suited to collective adjudication than to collective compensation. Even if the OCU actions succeed, compensation may still depend on potentially thousands of individual enforcement proceedings.

Why Spain Never Developed Effective Collective Antitrust Litigation

Collective antitrust actions never took off in Spain because in the law such claims are limited to consumers. However, the problem is broader. The current framework combines restrictive standing rules, distinctions between collective and diffuse interests that are often difficult to apply in practice, fragmented procedural rules, cumbersome notice requirements and a particularly awkward enforcement stage.

The problem is not that the Spanish system was designed for a different type of litigation. The problem is that it never developed into a coherent collective redress mechanism at all. Instead, collective litigation rests on a patchwork of provisions in the Civil Procedure Act whose interaction remains uncertain and whose effectiveness has rarely been demonstrated in practice.

The result is paradoxical. Spain became one of Europe's leading jurisdictions for cartel damages litigation without developing a workable procedural framework for collective compensation.

The trucks cartel illustrates the point particularly well. If any case seemed suitable for collective redress, it was the massive litigation generated by the European Commission's trucks cartel decision. Yet collective actions were never seriously considered. One reason was that all claimants were businesses rather than consumers. But equally important was the lack of an attractive procedural mechanism capable of processing thousands of claims efficiently. The litigation instead evolved through tens of thousands of individual actions filed in the 108 commercial courts across the country.

The forthcoming implementation of the Representative Actions Directive (2020/1818/EU) may alter some aspects of the procedural framework. However, it is unlikely to address one of the most significant limitations of the current system. Representative actions will remain confined to consumer interests. As a result, the very type of mass litigation that has dominated Spanish competition damages practice—claims brought by businesses harmed by cartels—would still fall largely outside the collective redress mechanism.

This limitation is difficult to justify. The economic rationale for collective litigation does not depend on whether the injured party is formally classified as a consumer or as an undertaking. Information asymmetries, litigation costs, collective action problems and enforcement deficits may affect both. Yet the Spanish model continues to draw a sharp distinction between them, leaving many mass business claims without an effective collective procedural vehicle.

The OCU automobile cartel experiment

Against this background, the automobile cartel litigation has produced Spain's most ambitious attempt at collective antitrust redress to date.

The Spanish Consumers' Organisation (OCU) has brought seven collective damages actions arising from the automobile cartel decision adopted by the Spanish Competition Authority (CNMC). Together, they constitute the largest collective antitrust initiative ever attempted in Spain.

Yet the very structure of these proceedings reveals some of the difficulties of the current model.

Ironically, Spain's largest collective antitrust initiative has been fragmented by OCU into seven separate proceedings before different courts and against different defendants (see Table below). The reasons for this strategy are not entirely clear. It may reflect a desire to avoid the complexity of a single action involving numerous defendants, to reduce the burden placed on any one court, or simply to diversify litigation risk across different jurisdictions. Whatever the explanation, the result is revealing: even collective litigation appears to require fragmentation.

The absence of previous experience with collective damages actions makes it difficult to predict how these proceedings will ultimately unfold. However, they already provide an unusually valuable opportunity to assess whether the existing Spanish framework can deliver effective collective compensation in a mass antitrust case.

Diffuse and Identified Interests: A Conceptual Distinction or an Information Problem?

Spanish collective actions distinguish between diffuse interests and identified (or readily identifiable) interests (article 11 of the Civil Procedure Act). The procedural consequences of that classification are significant, affecting both notice requirements and the possible participation in the proceedings of affected individuals.

The pending collective claims offer an unusual illustration of the practical difficulties generated by this distinction. Six of the actions were filed as actions protecting diffuse interests, whereas one action—the one brought against Renault—was framed as protecting identified interests.

At first sight, this is puzzling. The underlying harm is essentially the same in all seven proceedings: consumers allegedly affected by the same cartel infringement. The difference appears to stem not from the nature of the claims but from the availability of information identifying potentially affected consumers. During preparatory proceedings, OCU sought access to information held by public authorities (tax and traffic) concerning affected vehicle purchases. However, only in relation to Renault information was obtained (in the Commercial courts of Valladolid, see ES:APVA:2021:787A) to support an action based on identified interests.

This suggests that the classification may depend less on the substantive characteristics of the affected group than on the claimant's ability to gain access to relevant data (see par. 13 of ES:TIM:2026:10A). In practice, therefore, the distinction between diffuse and identified interests risks becoming an information-access issue rather than a meaningful conceptual criterion for organising collective litigation.

Neither opt-in nor opt-out

Comparative discussions of collective redress usually distinguish between opt-in and opt-out mechanisms. The Spanish model fits neither category particularly well.

It is not a classic opt-in system. Affected consumers may voluntarily intervene as a party in the collective proceedings, but intervention does not amount to joining a collective claim as it is known in other jurisdictions. Interveners become full parties to the litigation, with their own procedural rights and obligations. In that sense, participation is considerably more demanding than in the opt-in mechanisms commonly found in other jurisdictions.

Nor is it an opt-out system. The collective action is not conceived as a representative claim brought on behalf of all affected consumers. The claim serves as a “channel”, operated in the general interest, through which they can realize their claims (either through individual intervention in the proceedings or via execution of the abstract judgment obtained by OCU).

Consequently, there is neither the need nor the possibility for individuals to exclude themselves from the proceedings. The action functions instead as a procedural vehicle through which an abstract determination of liability may be obtained. However, the judgment would have a res judicata effect for the consumers whose rights are deemed compensable in the judgment (article 222.3 of Civil Procedure Act).

Indeed, consumers may prefer to file their individual claims in court, their  right to do so (independently of the existing collective claims) has been acknowledged by the CJEU (C-381/14 y C-385/14, EU:C:2016:252) and the Spanish Constitutional Court (ES:TC:2017:4; ES:TC:2016:148) in the context of litigation of unfair terms in banking contracts.

All this has important practical consequences. Consumers may choose to intervene in the proceedings, but they are not required to do so. They can also file their individual claims in parallel. Equally, they remain free to decide later whether to rely on and enforce a favourable judgment obtained by OCU. Participation therefore occurs, if at all, at different stages and through different mechanisms than those usually associated with either opt-in or opt-out models.

The OCU automobile cartel actions illustrate this ambiguity particularly well. To date, there appears to have been little or no voluntary intervention in the claims by individual consumers. Yet that does not necessarily mean the proceedings lack practical significance. Their value may ultimately depend less on participation during the litigation than on what happens once a judgment is delivered (at the enforcement/execution stage).

When Procedural Complexity Becomes a Defence Strategy

The shortcomings of the existing regime are not merely theoretical. Procedural complexity may itself become a litigation asset for defendants.

The automobile cartel proceedings illustrate the point. Questions concerning the classification of interests, the scope of participation by affected consumers, the relationship between collective and individual claims, and the procedural consequences of collective actions have generated extensive preliminary disputes. Many of these issues arise not from the substance of the underlying competition claims but from uncertainties inherent in the collective redress framework itself.

Significant uncertainties remain concerning the relationship between collective and individual actions. In particular, it is unclear how the two forms of collective action combined by OCU—actions protecting diffuse interests and actions protecting identified interests—may affect parallel individual claims.  Some courts may favour stays based on lis pendens or concerns about inconsistent judgments, while others may emphasise the autonomous nature of individual compensation claims.

Another unresolved issue concerns the content of any eventual judgment. Will the court merely establish abstract criteria for identifying beneficiaries and quantifying harm, or will it provide a sufficiently individualized framework to facilitate subsequent enforcement? These questions go to the heart of the effectiveness of the mechanism and are likely to become a significant source of procedural controversy.

From the perspective of consumers, such disputes increase delay, uncertainty and litigation costs. From the perspective of defendants, however, procedural ambiguity may provide opportunities to challenge standing, contest admissibility, restrict participation or seek procedural stays and appeals. The collective action mechanism thus risks becoming a source of satellite litigation rather than a vehicle for efficient dispute resolution.

This outcome is particularly problematic because collective redress is normally justified by considerations of procedural economy and access to justice. It also introduces legal uncertainty in the last year of the limitation period (though this may be controversial, see Almacén de Derecho 2/2/26). If the mechanism generates additional procedural complexity without materially simplifying compensation, its practical benefits become far less obvious.

The OCU litigation demonstrates that the effectiveness of collective redress depends not only on the existence of collective procedures, but also on their capacity to reduce rather than multiply procedural disputes. In that respect, the current framework appears ill-suited to the very type of mass litigation for which collective mechanisms are supposed to exist.

On the other hand, the automobile cartel proceedings have also served to illustrate a broader structural problem. Where collective redress is unavailable or ineffective, procedural coordination does not disappear; it simply migrates to the defendants' side. The result may be a form of collective defence that exploits procedural fragmentation and asymmetries of resources, transforming complexity into a strategic asset for cartelists (Almacén de Derecho 2/4/26).

Collective Adjudication Without Collective Compensation?

The most revealing feature of the Spanish model may emerge at the end of the proceedings rather than at their beginning.

Even if OCU ultimately succeeds, the court will not award aggregate damages to a class of consumers. Nor will it establish a compensation fund to be distributed among affected individuals. Apart from those consumers who may have formally intervened in the proceedings, the judgment will operate largely in the abstract.

The court's task will not be to determine the compensation due to each affected consumer. Instead, it will establish the conditions under which consumers may subsequently claim compensation and, where possible, provide criteria for identifying and quantifying the harm suffered (articles 221 and 519 of Civil Procedure Act).

In other words, the collective action does not itself produce collective compensation (aggregate damages award). It produces a framework for future compensation claims (see, e.g. in the context of a damages award for the breach of contractual and statutory duties to ensure the safe and continuous operation of a motorway by the concessionaire, ES:TS:2010:4717).

This design reflects the logic of the Spanish system. Because the claimant organisation does not represent individual consumers in the ordinary sense, it does not seek compensation on their behalf. Rather, it pursues a judgment capable of benefiting any consumer who later proves that he or she falls within the category defined by the court.

Whether this constitutes effective collective redress is open to debate. The practical success of the mechanism depends not only on obtaining a favourable judgment but also on the ease with which individual consumers can subsequently enforce it. If thousands of consumers must still undertake additional procedural steps to obtain compensation, part of the efficiency gains normally associated with collective litigation may be lost.

The financing of the OCU litigation illustrates the point. Because a successful judgment would not automatically generate compensation payable to OCU or to a defined group of represented consumers, the organisation has reportedly sought separate mandates from affected consumers for the future enforcement stage. Under those arrangements, OCU would assist consumers in enforcing any favourable judgment in exchange for a percentage of the compensation ultimately recovered.

The engagement terms reveal another unusual feature of the model. They expressly contemplate the possibility that any settlement offered by a manufacturer could consist of discounts on future purchases of vehicles or other products instead of a monetary payment. Although such arrangements may facilitate settlements in mass litigation, they sit uneasily with the principle of full compensation. A consumer who allegedly paid an unlawful overcharge is not necessarily restored by being encouraged to enter into a new commercial relationship with the infringing undertaking. Ironically, the victim of an alleged cartel overcharge may end up being compensated through incentives to purchase once again from the very undertaking accused of having caused the harm

From a legal perspective, it seems that OCU’s enforcement mandates are distinct from the collective action itself. Yet their existence reveals an important feature of the Spanish model. The economic viability of collective litigation may depend not on the collective action as such, but on the claimant organisation's ability to participate later in the enforcement process. Unlike class actions in the United States, collective settlements in the Netherlands, or representative damages actions in the United Kingdom, the Spanish model does not aggregate compensation itself but merely facilitates later individual enforcement.

This creates an unusual separation between adjudication and compensation. The collective action establishes liability, while the economic incentives that sustain the litigation may arise primarily from the subsequent enforcement of the judgment. It also raises the familiar risk of free riding: consumers who never contributed to the costs of the litigation may nevertheless benefit from the judgment obtained by the claimant organisation.

The automobile cartel proceedings therefore raise a broader question. Is the current model truly designed to provide collective compensation, or is it better understood as a mechanism for collective adjudication followed by individual enforcement? How much procedural efficiency remains when collective litigation ultimately requires thousands of individual enforcement proceedings?

Awaiting the Representative Actions Directive, but Not Expecting Miracles

The OCU proceedings represent the most significant experiment in collective antitrust redress ever undertaken in Spain. Whether the actions ultimately succeed or fail, they have already exposed several structural features of the current system.

The difficulties do not stem solely from the distinction between diffuse and identified interests, or from the unusual position occupied by claimant organisations. More fundamentally, the Spanish model remains characterised by a separation between collective adjudication and collective compensation. The collective action may establish liability and define the conditions under which compensation is due, but the practical realization of that compensation often remains dependent on subsequent individual action.

The implementation of the Representative Actions Directive may alleviate some of the procedural shortcomings of the current framework. Nevertheless, one of the central limitations of the Spanish model is likely to remain. Collective redress continues to be conceived only as a mechanism for consumer protection (article 828.1 of the Civil Procedure Act, that will be introduced by Draft Bill collective actions for the protection and defence of the rights and interests of consumers and users). Yet some of the largest mass damages cases generated by competition infringements involve businesses rather than consumers. The trucks cartel provides the clearest example.

For that reason, the pending collective claims reveal more than the shortcomings of the existing procedural regime. It also highlights a broader policy question that will remain relevant even after the Directive is implemented: whether collective redress should continue to depend on the consumer-business distinction, or whether mass harm itself should become the decisive criterion for collective enforcement. Why should collective redress be available for mass consumer harm but not for mass business harm?

The Spanish experience suggests that procedural reform alone may not be enough. A jurisdiction that has become one of Europe's leading laboratories for cartel damages litigation still lacks a truly effective mechanism for the collective vindication of those claims.