Maggy Sullivan, a nationally recognized trial lawyer, represents multinational clients in complex antitrust litigation and investigations before federal regulators. She ranks among an elite few antitrust trial lawyers who have secured multiple merger litigation victories against the government.
Maggy brings strategic foresight and more than two decades of experience to her work managing litigation in all its forms, including:
She regularly develops compelling theories and strategies and excels at persuading parties across the litigation spectrum to adopt her perspective. Maggy has won two of the most complex, high-profile matters in the history of the US Department of Justice (DOJ): the Illumina/GRAIL merger and the Booz Allen Hamilton/EverWatch merger.
Her established track record demonstrates excellence in handling sprawling, long-running antitrust matters that run the gamut from investigation, to criminal prosecution, to multi-district litigation, or commercial class actions.
Maggy is regularly recognized for her work by leading industry publications, including Chambers USA, Global Competition Review, Legal 500, and Benchmark Litigation.
Maggy's successes include representing:
In the leading competition publication’s annual review of the strongest antitrust practices around the globe, the firm dominated in every category, ranking second across all specialties.
Named a Top 20 Trial Law Firm in the US and ranked Tier 1 in antitrust, appellate, general commercial, IP, securities, and white collar categories.
Leading French competition publication selects two Latham articles as winners at the 2024 Antitrust Writing Awards.