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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.

Discover our data driven insights into class action risk across Europe


Other related content

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

European Class Actions

CMS International Disputes Digest – 2025 Winter Edition

15 Dec 2025 2 min read

CMS Class Actions video series

15 Apr 2024 1 min read

CMS Disputes Talk

29 Dec 2023 1 min read

CMS European Class Actions Report 2023

12 Sep 2023 3 min read

CMS International Disputes Digest - 2022 Summer Edition

21 Jul 2022 3 min read

CMS European Class Actions Report 2022

07 Jul 2022 2 min read

CMS Expert Guide to European class actions

23 Mar 2022 3 min read

CMS International Disputes Digest - 2021 Winter Edition

20 Dec 2021 3 min read

Events

  • International
    08 Apr 2026

    CMS at Fordham IP & Policy Conference

  • International
    21 Apr 2026

    On the Pulse webinar series 2026 - Spring/Summer

  • International
    28 Apr 2026

    Strategic expansion to India: A new chapter for UK higher education

  • International
    28 Apr 2026

    IP Insights webinar series 2026

  • International
    02 May 2026

    CMS at INTA 2026

  • International
    05 May 2026

    2026 Insurance sector webinar programme

  • International
    13 May 2026

    2026 ITechLaw World Technology Law Conference in Chicago

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