Simpson Thacher & Bartlett


Head Office Address:
425 Lexington Ave
New York, NY 10017
United States

Telephone:+1 212 455 2000
Fax:+1 212 455 2502

Sophisticated clients worldwide entrust us with their formidable disputes for a single reason–our remarkable track record. Clients seek our advice on high-stakes litigation, cross-border disputes, as well as government and internal investigations in the Americas, Europe and Asia.

Antitrust and Trade Regulation:
Clients turn to us for our record of success in handling high-stakes antitrust disputes, investigations, and achieving regulatory clearance for the largest and most complicated transactions. We advise clients on internal investigations, enforcement matters, and regulatory issues in connection with the OFAC, the Department of State, and the SEC.

Our comprehensive practice covers all aspects of bankruptcy-related litigation–from disputes over plan confirmation to tender liability and equitable subordination claims to issues arising out of insurance disputes and mass tort-related bankruptcies.

Equity and Civil Rights Reviews:
Simpson Thacher’s multidisciplinary Equity and Civil Rights Reviews team provides companies, boards, sponsors and other financial institutions with comprehensive audits, analyses and concrete guidance to mitigate legal, reputational and business risks associated with diversity, equity and inclusion issues.

ERISA Litigation:
Clients benefit from our coordinated advice in closely aligned areas, including securities, bankruptcy, and government investigations, and our ability to present arguments and evidence in the manner best suited to advance business interests and resolve conflicts with minimal disruption to their operations.

False Advertising Litigation:
Companies in a broad range of fields, including pharmaceuticals, financial services, consumer products and food and beverage, turn to us for our significant experience in false advertising litigation, including disputes between competitors and consumer class actions.

Funds, Regulatory and Investigations:
Our team includes attorneys with decades of experience in the funds industry, former senior government officials from the SEC, former U.S. federal prosecutors, and a former PE Chief Compliance Officer, who draw upon their deep experience and institutional knowledge to provide sophisticated advice to clients on a broad spectrum of critical regulatory and compliance issues.

Government and Internal Investigations:
Government and internal investigations can be a highly sensitive, time-consuming ordeal for any company. Large and small companies and their boards, audit and special committees, officers and directors, and other individuals regularly turn to us for advice on a wide range of criminal, regulatory, congressional and other sensitive government inquiries and internal investigations.

Insurance and Reinsurance:
Clients benefit from our experience as the leading firm representing the interests of both ceding companies and reinsurers in litigations and arbitrations throughout the United States, the United Kingdom and Bermuda. Major insurance groups, including Travelers, AIG, Berkshire Hathaway, Lloyd’s of London and CNA have trusted us on their most significant matters.

Intellectual Property:
Understanding and protecting IP is crucial to the long-term success of many businesses. Clients seek our advice in high-stakes, “make it or break it” disputes and rely on our broad array of substantive experience in both litigation and transactional matters to help them protect their interests.

International Arbitration:
Multinational corporations across the globe rely on our International Arbitration Practice for high-stakes matters when their business reputation or commercial relationships are at risk. We have a track record of success in taking cases through trial and final awards in major international arbitration venues such as Paris, London, Geneva, The Hague, Singapore, New York and Washington, D.C.

International Regulatory and Compliance:
With increased activism and cross-border cooperation between enforcement and regulatory agencies, we represent the interests of clients operating in multiple jurisdictions and have advised on issues in China, India, Eastern Europe, the Middle East, Latin America and Africa. The clients we represent are involved in numerous sectors, including financial services and asset management, telecommunications, energy, mining, manufacturing, technology and healthcare.

Mergers and Acquisitions Litigation:
Clients seek our market-leading advice in all aspects of M&A litigation—where we excel at defending challenges to the largest and most complex mergers and acquisitions. They appreciate our extensive experience defeating efforts to enjoin transactions prior to closing; resolving claims through reasonable settlements pre-closing; and litigating claims for damages post-closing.

Privacy and Cybersecurity:
Our multidisciplinary Privacy and Cybersecurity team advises global companies facing heightened regulatory, contractual and consumer obligations surrounding the management of data.

Product Liability and Mass Tort:
Since the 1970s, clients have relied on our advice as a leader in the development of product liability and mass tort law in the United States. We have taken countless product liability and mass tort cases to jury trial in state and federal courts over the years, amassing invaluable courtroom experience.

For decades, clients have relied on our securities litigators in the most complex, high-profile, high-stakes securities matters of the day. The country’s most respected Fortune 500 corporations and financial institutions turn to us to help defend against headline-making allegations.

Whistleblower and False Claims Act:
Companies and their boards have relied on us to respond to allegations by whistleblowers and to help them devise and implement corporate whistleblower policies. Clients seek our counsel on whistleblower matters in a broad range of sectors—including defense, healthcare, technology and financial services.

Office Locations:
New York • Beijing • Brussels • Hong Kong • Houston • London • Los Angeles • Palo Alto • São Paulo • Tokyo • Washington, D.C.

Updated Aug 2023