Simpson Thacher & Bartlett was founded in 1884 in New York, where it still maintains its headquarters. The New York office is also the firm’s largest, but it has since expanded to 10 offices across three continents. In the United States, it also has offices in Houston, Los Angeles, Palo Alto and Washington DC. 

The firm is best known for its top tier work in banking, debt and equity capital markets, M&A and private equity. The firm’s New York office is a market leader in financial and corporate practices and the California offices are market leaders in capital markets. In financial services regulatory work the team advises banks and financial institutions in compliance related to acquisitions and equity investments.