CMS Cameron McKenna Nabarro Olswang

CMS Cameron McKenna Nabarro Olswang
CMS · Public domain · source
Name	CMS Cameron McKenna Nabarro Olswang
Founded	1999 (through merger)
Headquarters	London
Num offices	various
Num lawyers	thousands (at peak)

CMS Cameron McKenna Nabarro Olswang was a major international law firm formed by the merger of Cameron McKenna and Nabarro with Olswang in 2017, operating across multiple jurisdictions in Europe, the Middle East, Asia and the Americas. The firm provided transactional, litigation and regulatory advice to clients in sectors such as energy, finance, technology, media and telecommunications, working with corporations, financial institutions and public bodies including those associated with European Union law, United Kingdom regulation and cross-border International Chamber of Commerce disputes. Its profile placed it among peers such as Allen & Overy, Clifford Chance, Freshfields Bruckhaus Deringer and Linklaters before subsequent corporate changes reshaped the entity.

History

The antecedent firms trace roots to earlier periods: Cameron McKenna originated in the 19th century in London, while Nabarro and Olswang developed reputations in corporate and media work respectively, interacting with matters involving Royal Mail Group privatisation, British Steel restructurings and BT Group regulatory appeals. During the late 20th and early 21st centuries the firms engaged with transactions tied to European Commission state aid inquiries, National Health Service contracts and Olympic Games procurement disputes, culminating in the 2017 three-way merger that aligned practices across Antitrust law-adjacent litigation, energy project finance and technology licensing. Post-merger activities intersected with multinational clients such as BP, Shell plc, Vodafone Group, Deutsche Bank and Goldman Sachs.

Structure and Practice Areas

The firm organised practice groups by sector and service lines similar to Herbert Smith Freehills and Eversheds Sutherland, with teams handling Mergers and Acquisitions for clients like Rio Tinto, project finance for National Grid plc-related initiatives, arbitration before bodies including the International Centre for Settlement of Investment Disputes and litigation in courts such as the High Court of Justice and the Court of Appeal of England and Wales. Practice areas included energy and natural resources work interacting with OPEC-linked operators, financial services advising on matters involving London Stock Exchange Group listings, technology, media and telecommunications engagements with companies like Sky Group and Facebook, and real estate transactions tied to institutional investors such as BlackRock and UBS Group.

Notable Deals and Cases

The firm advised on large cross-border mandates and disputes, participating in transactions comparable to the Rolls-Royce Holdings restructuring, sovereign advisory matters linked to Ministry of Defence (United Kingdom) procurement, and project financings akin to offshore wind farm deals involving Ørsted (company). Litigation work included commercial disputes referencing precedent from Donoghue v Stevenson-era tort law evolution and arbitration involving state entities similar to cases brought under bilateral investment treaties related to United Kingdom–Ukraine relations. The firm also acted in IP litigation and licensing matters against technology firms akin to Google LLC and Apple Inc..

Offices and Global Presence

Before corporate integration into successor structures the firm maintained offices in major financial and commercial centres, comparable to the footprints of Skadden, Arps, Slate, Meagher & Flom LLP and Baker McKenzie, with a strong presence in London, and representative teams engaging with markets in Paris, Frankfurt, Dubai, Singapore, Hong Kong and New York City. Its network supported mandates spanning European Union-wide regulatory coordination, Middle Eastern energy projects in partnership with entities like Abu Dhabi National Oil Company and Asia-Pacific technology deals similar to those involving Tencent and Alibaba Group.

Leadership and Key People

Leadership drew on senior partners and practice heads who had experience advising governments and multinational corporations, often interacting with figures and institutions such as Theresa May-era ministers, Bank of England officials and regulatory authorities like the Financial Conduct Authority. Key partners had backgrounds in high-profile disputes and transactional work alongside external counsel from firms like Sidley Austin and CMS (law firm)-branded international networks. Senior leadership steered integration across legacy cultures influenced by predecessors from Cameron McKenna, Nabarro and Olswang.

Awards and Rankings

The firm featured in rankings produced by The Legal 500 and Chambers and Partners, receiving recognition in energy, infrastructure, telecommunications and corporate/M&A categories alongside rankings occupied by Norton Rose Fulbright and Dentons. Awards and shortlists included acknowledgements at ceremonies associated with The Lawyer and industry lists tracking performance in cross-border work with clients such as Siemens and General Electric.

Mergers and Corporate Changes

The 2017 merger forming the combined firm was a strategic consolidation comparable to other legal sector consolidations such as Dentons' global expansion and the Freshfields mergers, designed to enhance scale against competitors like Sullivan & Cromwell and White & Case. Subsequent restructurings and integrations saw the firm align with the global CMS network and respond to market shifts including pan-European regulatory changes stemming from Brexit negotiations and European Court of Justice jurisprudence, resulting in further corporate realignments and practice rationalisations.

Category:Law firms based in London