Simpson Thacher & Bartlett LLP

Simpson Thacher & Bartlett LLP is widely regarded as a market-leading presence in the financial services sector on both major pieces of civil litigation as well as on governmental and internal investigations. Clients of the practice span major investment banks, asset managers, fintech groups and a wide array of directors and officers, and the group is also retained by a number of Federal Reserve banks on litigation. Securities class actions, SPAC M&A, and LIBOR litigation are areas in which the practice has achieved major success for its banking clients in trial, and elsewhere the firm advises on antitrust and white-collar crime investigation. The team’s efforts are spearheaded in New York by Lynn K. Neuner and Jonathan K. Youngwood, who have led on prominent pieces of class action litigation, preliminary injunctions, and post-bankruptcy disputes, and New York's Craig Waldman specializes in post-M&A disputes. In addition, the firm’s strength in depth was bolstered in 2025 by the arrivals of Washington DC’s Adam Aderton in March from Willkie Farr & Gallagher LLP, who specialises in SEC investigations.