Allen & Overy and Shearman & Sterling vote through mega-merger

Managing IP is part of Legal Benchmarking Limited, 1-2 Paris Gardens, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

Allen & Overy and Shearman & Sterling vote through mega-merger

Allen & Overy

UK-headquartered Allen & Overy and US firm Shearman & Sterling have agreed to merge, with 99% of votes in favour

Allen & Overy and Shearman & Sterling have agreed to merge today, a move that partners at both firms say will create a “global elite law firm”.

The deal, first proposed in May, creates A&O Shearman, a firm that boasts 3,950 lawyers and 800 partners across 48 offices with combined revenues of approximately $3.5 billion.

A&O appears to be the more dominant force when it comes to intellectual property. The firm has an expansive IP team covering multiple jurisdictions.

Shearman & Sterling does not appear, at least on the face of it, to have a particularly large IP practice. Its website profiles 10 IP litigation lawyers and six lawyers active in IP transactions.

When Managing IP contacted both firms in May neither wanted to be drawn on IP specifics.

According to both firms, A&O Shearman will be the only global firm that offers US, UK and local law capabilities in equal measure.

The announcement in May was subject to partners at both firms voting in favour of the proposal with a significant majority needed to pursue the plans. More than 99% of the votes cast at each firm were in favour.

The deal is expected to be finalised in or before May 2024.

Both firms have made no secret of their desire to secure a transatlantic tie-up.

In March, Shearman & Sterling abandoned talks over a tie-up with Hogan Lovells, while A&O previously pursued a merger with another US firm, O'Melveny & Myers.

Wim Dejonghe, senior partner at A&O in London, said: “This is a historic moment for both firms and our profession. We are delighted that our partners have voted so resoundingly in favour of this merger, which is a transformational step for the legal industry."

Adam Hakki, senior partner at Shearman & Sterling, said: “Our partners have recognised and welcomed this unparalleled opportunity to combine our individual market leadership and brands to serve clients as an integrated global law firm, preeminent in all our markets.”

more from across site and SHARED ros bottom lb

More from across our site

A counterfeiting crackdown targeting fake FIFA World Cup merchandise and new partner hires by CMS, HGF and Winston Strawn were also among the top talking points
Law firms need to accept the hard truth: talent migration isn't personal; it's business as usual
Judge Alan Albright is to leave his role at the Western District of Texas, and could return to private practice
Stobbs has successfully seen off a contempt of court application filed against the firm and two of its lawyers
After almost a quarter of a century, Marshall Gerstein has a new managing partner
Abbott winning another round against Sinocare and Menarini, and 'long arm' clarification on the UK's position within the UPC, were also among major developments
Maria Peyman, head of IP at Birketts, explains why the firm is adopting a ‘seamless approach’ for clients by integrating two of its practice areas
Matthew Swinn, who leads the firm’s IP practice, discusses why Mallesons is well-placed to remain a major IP force
Lawyers at A&O Shearman analyse developments regarding UPC’s long-arm jurisdiction, including its scope and jurisdictional limits
Michelle Lee discusses reaching milestones at the USPTO, AI’s role in legal work, and how to empower women in tech and IP
Gift this article