In re Marriott International Inc. Customer Data Security Breach Litigation
In re Marriott International Inc. Customer Data Security Breach Litigation (D. Md.): Cohen Milstein serves as Co-Lead Counsel to oversee a putative nationwide class action related to the data breach of personal information of nearly 400 million customers of Starwood-branded hotels, subsequently acquired by Marriott in 2016, making it one of the largest data breaches in U.S. history.
General Motors Litigation
General Motors Litigation (E.D. Mich.): Cohen Milstein, as court-appointed Lead Counsel and Plaintiff Steering Committee Chair, represents a certified class of consumers in more than 25 states who purchased or leased new and used vehicles manufactured by GM in a consolidated breach of warranty and deceptive and fraudulent business practices class action against GM. Plaintiffs bring their claims under state consumer protection statutes and express and implied warranty law of their respective states, related to GM’s manufacture and sale of defective eight-speed automatic transmissions (GM 8L90 or the 8L45), manufactured by between 2015 and 2019.
Facebook Potential Reach Litigation
Cohen Milstein, as Class Counsel, represents a certified class of advertisers who claim that Facebook’s Potential Reach metric is false and misleading due to systemic inflation of the Potential Reach. On January 13, 2025, The U.S. Supreme Court declined Meta’s petition to review the Ninth Circuit’s 2023 opinion affirming the lower court’s 2022 class certification. As of December 5, 2025, the jury trial originally scheduled for October 14, 2025 has been vacated pending an appeal for arbitration by Meta filed weeks before trial was to begin.
In re Blackbaud, Inc., Customer Data Breach Litigation
In re Blackbaud, Inc., Customer Data Breach Litigation (D.S.C.): On February 16, 2021, Cohen Milstein was appointed to the Plaintiffs’ Steering Committee in this data breach class action in which Plaintiffs claim that Blackbaud failed to take reasonable steps to prevent a data beach, starting in February 2020, and failed to promptly or accurately provide notice of the data breach to those affected.
Lyman, et al. v. Ford Motor Company
Lyman, et al. v. Ford Motor Company (E.D. Mich.): Cohen Milstein represents plaintiffs who purchased or leased vehicles manufactured by Ford Motor Company in a consolidated breach of warranty and deceptive and fraudulent business practices class action against Ford Motor Company. Plaintiffs bring their claims under the Magnuson Moss Warranty Act and the consumer fraud statutes of their respective states, related to Ford’s manufacture and sale of defective Ford F-150 pickup trucks, Model Years 2018-2020 equipped with 5.0L engines.
Maugain, et al. v. FCA US LLC
Maugain, et al. v. FCA US LLC (D. Del.): Cohen Milstein represents owners of Chrysler, Dodge, Jeep, or RAM-branded vehicles across the United States in a consumer protection class action alleging that Fiat Chrysler America (FCA) sold defective Pentastar 3.6 liter V6 engines in 2014 or newer Chrysler, Dodge, Jeep, or RAM-branded vehicles violating implied breach of warranty and unjust enrichment statutes under federal and state laws of California, Florida, Georgia, Illinois, Massachusetts, New Hampshire, New York, Pennsylvania, and Texas.
Belyea, et al. v. GreenSky, Inc., et al.
Belyea, et al. v. GreenSky, Inc., et al. (N.D. Cal.): Cohen Milstein, as Co-Lead Counsel, is representing consumers in this certified false advertising and unfair business practices class action, alleging that GreenSky, a financial technology company, operates in California as an unlicensed and unregistered credit services organization, finance lender, and broker in violation of California Financing Law the Credit Services Act of 1984, and other federal and state laws.
Siemens’ Arc Fault Circuit Interrupters (AFCI) Litigation
Kevin Brnich Electric LLC, et al. v. Siemens Industry, Inc. (N.D. Ga.): Cohen Milstein is Co-Lead Counsel in this false advertising and product defect consumer protection class action, alleging that Siemens’ AFCI circuit breakers are defective and Siemens misrepresents and omits information about the quality of its AFCIs.
MOVEit Data Breach Litigation
In re: Moveit Customer Data Security Breach Litigation (D. Mass.): Cohen Milstein is one of five court-appointed co-lead counsel overseeing this multidistrict litigation addressing the massive May 2023 data breach involving Progress Software Corp.’s file-sharing software, MOVEit Transfer, which impacted more than 2,500 organizations, including hospitals, banks, businesses, governments, pension funds, universities, among others, and more than 67 million individuals worldwide.