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European Class Actions

CMS' leading class action team and unparalleled European structure develops and implements cohesive defence strategies for cross border cases.

Class actions are on the rise in Europe, and corporates are increasingly facing class actions filed in multiple European jurisdictions simultaneously. With the largest European coverage of any major law firm, CMS is uniquely placed to defend these matters robustly, whilst handling reputational and any regulatory issues. 

Class action risk is driven by local procedural law, and the diversity of rules within Europe means that corporates can face a patchwork of opt-in and opt-out claims. This requires a holistic defence strategy to address their specific threats. We identify fault lines and dispositive strategies. Opt-in claims bring particular logistical and practical challenges and our technology-driven practices deliver results whilst maximising efficiences. Opt-out claims are a new phenomenon in Europe, and require different strategies.

Most of all, we recognise that class actions can be board-level events. We support clients throughout the process and pride ourselves on the results we achieve.

Awards & Recognitions
01
  • Quote
    Acting as a strategic advisor for a leading German car-manufacturer against a large number of diesel-related customer claims before German courts and in several other European jurisdictions.
    CMS
  • Quote
    Defending banks and financial institutions in class action disputes regarding mortgage loans, financial instruments, pension funds, fraud, misleading statements, D&O liability and PI cover issues.
    CMS

Events

  • International
    28 Jan 2026

    TMT Finance EMEA 2026

  • International
    03 Mar 2026

    IP Insights webinar series 2026

  • International
    19 Mar 2026

    CMS Nordic Health Summit

  • International
    23 Mar 2026

    CMS at PTMG Spring 2026

  • International
    21 Apr 2026

    On the Pulse webinar series 2026 - Spring

Local market knowledge. Global outlook

We provide future-facing legal advice to help your organisation thrive. Combining local market knowledge and a global perspective, and with lawyers in locations worldwide, your organisation benefits from the expertise it needs, even across borders.

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