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

Cookies Settings

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

Yonatan Drori, attorney at Drori-Stav IP in Israel, explains why foreign counsel must treat Israel’s patent disclosure requirements as an ongoing obligation, rather than a one-off formality
From Japan to Southeast Asia, domestic and regional firms picked up some of the biggest prizes, while key foreign players maintained momentum
Earlier this month, Managing IP had exclusively reported that the French arm of Taylor Wessing was minded to pull out of the deal
Our latest podcast examines how Weil’s IP practice evolved, where its practitioners could (and will) go next, and which firms and markets stand to benefit from the redistribution of talent
Former Latham partner Chris Henry and transactions lawyer Liza Cotter are heading to the firm as Weil’s IP practice starts to disperse
Rival IP teams return to court for a closely watched appeal over AI and copyright, but observers hoping for answers to some of the technology’s biggest legal questions may be left disappointed
Eight years after its launch, members of the Australian patent firm’s Singapore office explain its growth strategy over the past year
Lawyers at Bowmans Kenya discuss the digital blind spots posed by the transition from physical ledgers to cloud databases and digital co-development models
The Powell Gilbert co-founder discusses the confidence required to launch a firm, building an enduring patent litigation practice and why developing the next generation has changed her measure of success
Cabinet M Oproiu’s Raluca Vasilescu explains why AI is changing what clients expect from patent attorneys, where the technology is overhyped and what the next generation will need to do differently
Gift this article