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

In other news, Australia’s IP office has announced expanded search options, and an EPO report shed light on slow progress relating to women inventors in Europe
Managing IP speaks with up-and-coming women lawyers at five law firms about fighting imposter syndrome, maintaining work-life balance and why real representation matters
Kilpatrick’s managing partner for San Francisco discusses taking the longer route to partnership, the importance of female mentors, and strengthening office culture
Home-working and grace periods at IP offices have been announced, while Managing IP understands Iran’s IP office is out of service
With INTA 2026 just two months away, London-based IP practitioners offer tips on making the most out of the city
New platform, which covers SEPs for the Wi-Fi 6 and Wi-Fi 7 standards, includes 10 patent owners
The Texas-based IP litigation hires take King & Spalding’s partner appointments from pre-merger Winston & Strawn up to 12 this year
Sunny Su explains how her team overcame challenges with orchard evidence collection to secure a favourable plant variety decision from China’s top court
Flexible working firm continues trajectory from 2025 with appointment of Matthew Grant and Letao Qin
Anousha Davies, associate and trademark attorney at Birketts, unpicks how the university’s reputation enabled it to see off a proposed trademark for ‘Cambridge Rowing’
Gift this article