About us

A&O Shearman was formed in 2024 via the merger of two historic firms, Allen & Overy and Shearman & Sterling. 


A firm built to achieve unparalleled outcomes

With nearly 4,000 lawyers globally, we are equally fluent in English law, U.S. law and the laws of the world’s most dynamic markets. 

This combination creates a new kind of law firm, one built to achieve unparalleled outcomes for our clients on their most complex, multijurisdictional matters – everywhere in the world.

A firm that advises at the forefront of the forces changing the current of global business and that is unrivalled in its global strength.  

A firm that delivers unmatched insight with seamless services 

A firm whose teams deliver unmatched insight with seamless service. A firm with a strong values and a commitment to sustainability, where diverse individuals, perspectives and backgrounds belong, excel, and make a decisive difference. 

Our lawyers have long enjoyed a reputation for cultivating powerful relationships, thriving on seamless collaboration with each other and with their clients and earning the right to be trusted advisors.  

Collective experience with many of the world’s most influential companies 

Our clients benefit from the collective experience of teams who work with many of the world’s most influential companies and institutions, and have a history of precedent-setting innovations. 

Together our lawyers advise more than a third of NYSE-listed businesses, a fifth of the NASDAQ and a notable proportion of the London Stock Exchange, the Euronext, Euronext Paris and the Tokyo and Hong Kong Stock Exchanges.  

A firm with the power to shape our clients’ fortunes 

This experience and expertise creates a firm with the power to shape our clients’ fortunes and apply the law in groundbreaking ways – whether through innovative thinking or new products, services and technologies.