A&O Shearman

A&O Shearman offers a standout antitrust capability in the financial services sector, leveraging its transatlantic capabilities to advise domestic and international banks and financial institutions on high-stakes class actions concerning securities and financial trading markets, price-fixing allegations, and monopolization claims. David Higbee, in Washington DC, co-heads the firm’s global antitrust offering and leverages his agency experience from the Antitrust Division to represent clients in agency-facing civil litigation matters, including defending clients before the FTC and the DOJ. Senior partner Adam Hakki represents leading banks in trading market class actions from the firm’s New York office; the duo jointly oversees the practice. Litigator Todd Stenerson represents both plaintiffs and defendants from the automotive, retail, and healthcare sectors in multidistrict litigations; Stenerson also handles investigations and arbitrations. In Dallas, Rachel Mossman Zieminski takes point on merger challenges in the aviation sector. Following the 2024 combination of Shearman and Allen & Overy LLP, the team now also includes Elaine Johnston, based in New York, who has a broad practice covering the full range of contentious and non-contentious antitrust issues across a range of industries; notably, Johnston recently represented Merz Pharmaceuticals in a class action concerning generic patent settlements. She works alongside the Washington DC-based Noah Brumfield, who takes point on antitrust matters in the chemicals, life sciences, and tech industries; the latter is a recent area of increased activity for the team. Another key member of the team is Todd Fishman, in New York, an experienced litigator with significant expertise in cross-border matters; Fishman is the key contact for clients in the financial services industry.