Netherlands: A Litigation: Mass Torts: Mainly Plaintiffs Overview

The Netherlands as a Forum for Collective Redress

The Netherlands is one of the most closely watched jurisdictions in Europe for collective actions and mass tort disputes. In a collective action, a representative organisation may file a claim against defendants on behalf of a defined group (class) with similar legal interests. This overview provides a practical guide to collective redress in the Netherlands.

The Netherlands offers a sophisticated judiciary, procedural flexibility, a tradition of openness and a pragmatic approach to third-party litigation funding, and a framework permitting collective actions on an opt-out basis. Claimants, litigation funders, institutional investors and consumer organisations increasingly view Dutch courts as an effective venue for large-scale dispute resolution in, among other areas, competition law, securities disputes, environmental damage, consumer protection, privacy breaches and ESG-related issues. The Netherlands also benefits from its position within the EU for jurisdiction and enforcement of judgments, facilitating the co-ordination of cross-border litigation.

Procedural Frameworks for Collective Redress

From WCAM to WAMCA

Dutch collective redress mechanisms have developed gradually. Historically, representative organisations could initiate proceedings to protect collective interests, but they could not claim damages on behalf of affected individuals or a class. As a result, collective actions primarily served as vehicles for declaratory judgments or injunctive relief. Parties would litigate to obtain a declaratory judgment on liability and simultaneously or subsequently initiate settlement negotiations.

The Act on the Collective Settlement of Mass Damages (Wet Collectieve Afwikkeling Massaschade – WCAM) enabled parties to request court approval for class-wide settlements binding large groups of claimants. The WCAM has resulted in several large-scale settlements, such as the Fortis settlement of UR1.3 billion. However, redress under the WCAM depended on the parties’ willingness to participate in settlement negotiations and provided no procedural basis to compel the parties to pay damages.

The practice of resolving mass tort litigation was further strengthened with the introduction of the Act on Redress of Mass Damages in Collective Action (Wet Afwikkeling Massaschade in Collectieve Actie – WAMCA), which entered into force in 2020. WAMCA fundamentally streamlined the Dutch collective redress landscape by allowing representative organisations to directly seek damages on behalf of a class on an opt-out basis. The Netherlands now offers one of the few European opt-out collective action schemes for damages, with opt-in participation for foreign claimants.

In principle, the WCAM regime continues to apply to collective actions relating to events giving rise to the claim occurring before 15 November 2016, while WAMCA applies to events giving rise to the claim occurring on or after that date. The WCAM still provides an option for parties to obtain a binding (opt-out) settlement agreement. This overview focuses primarily on the WAMCA framework, as it is expected that this framework will become increasingly important for resolving mass torts.

From admissibility to the merits under WAMCA

Under WAMCA, a representative organisation initiating a collective action must simultaneously register an extract of the writ of summons in the Dutch judiciary’s central collective action registry. Upon registration, a three-month period commences (extendable to six months) during which other representative organisations may file parallel collective actions based on similar facts. Once this period has expired, representative organisations are in principle barred from bringing collective claims concerning the same event. Individual proceedings against the defendants may be stayed during the collective action.

The proceedings then enter the admissibility phase, during which the court assesses whether the representative organisation(s) satisfies the statutory standing requirements. This includes scrutiny of representativeness, transparency, governance structures, financial resources and litigation funding arrangements. The court also evaluates whether the collective action is efficient and effective compared to individual proceedings, whether there is a sufficiently close connection to the Netherlands and whether the claim is not manifestly unfounded. Where multiple representative organisations have filed parallel actions, the court will appoint an exclusive class representative (“Exclusive Representative”). The Exclusive Representative acts as the primary procedural representative of the class and principal point of contact for the court and defendants. Depending on the claims involved, the court can appoint multiple or separate Exclusive Representatives for sub-classes.

Following this appointment, the court defines the class and establishes the applicable opt-out mechanism. Dutch-domiciled class members are in principle included on an opt-out basis, while foreign class members must in principle opt in unless the court determines otherwise. Class members who opt out are not bound by the judgment or settlement. Another feature of the admissibility phase is the court-facilitated or court-encouraged settlement phase to attempt to achieve a settlement before the proceedings continue to the substantive phase.

After the litigation on the merits, the court in principle determines the damages and the compensation schemes for the class. WAMCA also retains the option for the parties to enter into a binding opt-out settlement agreement during the proceedings (WCAM).

WAMCA also contains a lighter procedural regime for non-commercial public interest actions. This applies where proceedings pursue an idealistic or public interest objective and involve only limited financial interest.

Alternative collective redress mechanisms: opt-in

The Netherlands also permits opt-in collective redress besides WAMCA and WCAM. In practice, many claimants, foundations or representative organisations bring together claimant groups through participation agreements (eg, assignment or mandate), particularly in securities litigation and cross-border investor disputes. Opt-in mechanisms remain important because they provide greater flexibility and are not subject to the temporal limitations of WAMCA or its strict admissibility requirements.

Third-party litigation funding

The Netherlands is viewed as a funding-friendly jurisdiction, and litigation funding is firmly embedded within the collective claims ecosystem. Collective proceedings often involve extensive document review, economic analysis, expert evidence and prolonged procedural disputes. Funding arrangements provide access to justice while reducing financial exposure for represented parties.

Dutch law applies a limited loser-pays principle, with adverse costs subject to statutory caps. While there is no statutory regulatory regime for litigation funders in the Netherlands, third-party litigation funding is guided by soft-law principles, including the Dutch Claimcode. Instead, Dutch courts exercise oversight through procedural review, although WAMCA does impose some requirements regarding third-party litigation funding. Judges may scrutinise funding agreements to ensure that representative organisations maintain sufficient independence from the litigation funder and that remuneration structures remain proportionate.

The introduction of WAMCA and the expansion of litigation funding has also intensified competition within the claimant market. As a result, the Dutch collective redress environment has become increasingly professionalised and commercially sophisticated.

Challenges and future developments

Recently, the Dutch Research and Data Centre for Justice and Security issued an evaluation report on WAMCA. The report identified several practical challenges, including procedural complexity and lengthy admissibility phases. The evaluation nevertheless concluded that WAMCA broadly functions as intended and proposed targeted refinements aimed at improving procedural efficiency and predictability. As more WAMCA proceedings progress beyond the admissibility stage, Dutch courts are expected to provide further clarity on these issues, and to balance access to justice with safeguards against abusive litigation. Greater procedural clarity and predictability would further strengthen the Netherlands’ position as a leading European forum for claimant-side collective redress.

Conclusion

The Netherlands is historically one of Europe’s leading jurisdictions for collective redress and mass tort litigation. Through the introduction of WAMCA, the Netherlands firmly cemented its position as an international venue for collective redress. Alternative opt-in structures and the availability of litigation funding have further contributed to an active and increasingly professional claimant market. Collective actions now extend beyond traditional competition and securities disputes to include data privacy, consumer protection and ESG-related claims.