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Class Actions

When a company is hit with a class action, the consequences are swift and far-reaching, and can put its reputation, operations, and financial stability on the line. Clients turn to Arnold & Porter as the “master strategists”, frequently calling on our firm to serve as national coordinating counsel or as lead counsel in multidistrict litigations. Our attorneys are known for developing innovative ways to defeat class actions and extricate clients from inappropriate and unfavorable forums. We have defeated efforts to certify classes based on claims of economic injury by purchasers of harmful products, claims that reliance can be presumed in a fraud case, and the use of public nuisance to aggregate claims without the procedural protections of class action rules. In short, we get the job done where standard strategies fall flat.

  • Depth of Experience: Our case strategies draw on extensive experience in substantive legal areas: antitrust, consumer protection, data breaches, environmental, financial services, product liability, and securities.

  • Industry Knowledge: Our class action work spans accounting, automotive, banking, chemicals, consumer products and retail, energy, food and beverage, industrial products, pharmaceuticals, retail, transportation, and technology industries.

  • Novel Strategies: We don’t just apply playbooks, we rewrite them. Praised as “master strategists” by Chambers USA, our attorneys set new standards in class action defense, from defeating class certification with novel economics to reframing causation and dismantling aggregation theories.

“What distinguishes Arnold & Porter from other firms is their expertise… They have both deep knowledge and wide experience to provide the optimal defense.” – (client) Chambers USA 2025
BTI’s 2026 Litigation Outlook Report Recognizes Arnold & Porter as a Class Action Powerhouse
“They have an excellent litigation team. The lawyers are very diligent and excellent with oral arguments and briefings. They are also excellent with case management and responsiveness.” – (client) Chambers USA 2025
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Experience Highlights

  • Anthropic PBC, an artificial intelligence company, in securing a landmark fair use ruling holding that training generative AI models on copyrighted works constitutes fair use, and in resolving the remaining claims in a closely watched copyright class action.

  • Carnival Corporation and its subsidiaries as co-lead counsel in defense of multiple class actions and 200+ individual wrongful-death and personal injury claims arising from the COVID-19 pandemic. Obtained dismissal with prejudice or favorable resolution of all actions and established ground-breaking precedents in COVID claims.

  • Global Payment Card Network in individual and national class actions in federal court multidistrict litigation challenging interchange fees and network rules under the Sherman Act and state consumer protection statutes.

  • Honeywell International, Inc. in the defense of a consolidated class action and over 60 individual toxic tort suits arising out of the presence of PFAS in the groundwater and municipal water supply of Hoosick Falls, New York. 

  • IronNet, Inc. and its former officers in defending a securities class action arising from post-SPAC public disclosures regarding forecasted contract revenue.

  • McDonald's Corporation, Coty Inc., and Shiseido America Corp. in securing precedent-setting victories in first PFAS class actions against cosmetic and fast-food companies.

  • National oil and gas company in its successful defense against lead pigment public nuisance suits brought by the Rhode Island Attorney General, Ohio Attorney General, and numerous cities and counties in California, Illinois, New Jersey, and Ohio. Disposed of hundreds of cases by motion and prevailed in the four cases tried to verdict.

  • Puritan’s Pride, a Nestlé subsidiary, in obtaining a rare defense judgment following a certified class action trial, defeating claims that its BOGO promotional pricing constituted false or misleading advertising.

  • Samsung Electronics America in obtaining dismissal of a nationwide data breach class action MDL in the District of New Jersey, where plaintiffs asserted class-wide and statutory claims in a 97-count consolidated complaint.

  • Samsung Electronics America in securing dismissal of high-stakes, coordinated nationwide consumer class actions alleging that gas cooking appliances are inherently defective, defeating claims that threatened billions in damages and industry-wide disruption.

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Recognition

  • Benchmark Litigation
    Highly Recommended — Dispute Resolution (District of Columbia) (2024-2026)
    Recommended — Dispute Resolution (California) (2024-2026)
    Recommended — Dispute Resolution (New York) (2024-2026)
  • Best Law Firms Ranked by Best Lawyers
    Commercial Litigation (Boston) (2025-2026)
    Commercial Litigation (Colorado) (2025-2026)
    Commercial Litigation (Houston) (2024-2026)
    Commercial Litigation (National) (2010-2026)
    Commercial Litigation (San Francisco) (2024-2026)
    Commercial Litigation (Washington, D.C.) (2010-2026)
    Bet-the-Company Litigation (San Francisco) (2020-2026)
    Mass Tort Litigation/Class Actions — Defendant (Boston) (2026)
    Mass Tort Litigation/Class Actions — Defendant (National) (2018-2026)
    Mass Tort Litigation/Class Actions — Defendant (New York) (2018-2026)
  • BTI Consulting Group
    Class Action Powerhouses (2025 - 2026)
    Class Action Leaders (2024)
    Intimidating Opponent in Litigation (2023-2026)
    Gen AI Litigation Leaders (2026)
  • The Legal 500 US
    Antitrust: Civil Litigation/Class Actions (2016-2025)
    Product Liability, Mass Tort and Class Action: Consumer Products (including tobacco) (2009-2025)
    Product Liability, Mass Tort and Class Action — Defense: Pharmaceuticals and Medical Devices (2014-2025)
    Product Liability, Mass Tort and Class Action — Defense: Toxic Tort (2011-2025)
    Securities Litigation: Defense (2014-2025)