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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
    20 Feb 2026

    EU Competition Law Briefing - 2026 Outlook

  • International
    24 Feb 2026

    CMS Perceiving the world of patents with Emotional Perception

  • International
    24 Feb 2026

    Internal investigations in the age of Gen AI - Practical guidance for organisations across LATAM

  • International
    25 Feb 2026

    Industrial Transition: From automotive to defence

  • International
    26 Feb 2026

    Power Breakfast & Networking Event

  • International
    03 Mar 2026

    IP Insights webinar series 2026

  • International
    23 Mar 2026

    CMS at PTMG Spring 2026

  • International
    21 Apr 2026

    On the Pulse webinar series 2026 - Spring

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