M and A Regulation and Disputes 2026

INTRODUCTION  Contributed by: Frank Aquila, Sullivan & Cromwell LLP

Why a comparative guide matters now Cross-border M&A has always required a work - ing knowledge of different legal systems. What has changed is the intensity of regulatory intervention and the degree to which politics, industrial policy and national security considerations can determine outcomes. Competition authorities are increasingly willing to investigate complex theories of harm, scru - tinise data-driven or innovation-focused mergers, and pursue enforcement strategies that do not always track historic precedents. Meanwhile, national secu - rity screening has expanded far beyond traditional defence assets, capturing sensitive technology, criti - cal infrastructure, energy, communications, health - care supply chains, strategic real estate and access to valuable datasets. At the same time, M&A litigation has become, in many markets, both more sophisticated and more frequent. Disputes now commonly arise over termination rights, material adverse change/effect clauses, satisfaction of regulatory conditions, the parties’ obligations to seek approvals, and the adequacy of remedies offered to regulators. In some jurisdictions, transactions also face an increased risk of challenges to process, gov - ernance and disclosure. This is particularly the case in deals for listed companies and in situations involving conflicts of interest, minority shareholder concerns or contested auctions. The questions this guide is built to answer The guide is structured around the questions that arise when planning and executing M&A in this – more heavily regulated and litigated –than ever environ - ment. Contributors address, among other topics, the following. • How the enforcement environment is changing – what has shifted in the past 12 months, where authorities are intervening more actively, and what trends are emerging in the theories of harm, sec - tors of focus and procedural approach. • What laws and institutions matter most – the prin - cipal statutes, regulations and policy instruments; the responsible authorities; and how their man - dates and powers are allocated. • How far regimes reach – whether foreign-to-foreign transactions are caught, how “local effects” are

Approval Pathways and Courtroom Risks: Global M&A Regulation & Disputes This cross-border guide provides a practical, jurisdic - tion-by-jurisdiction comparison of the laws, regulatory processes and disputes that shape modern M&A. It is designed for deal-makers and counsel who need to understand not only what the rules say, but how they are applied in live transactions and contested situa - tions. Each chapter is written by leading advisers in the relevant jurisdiction and follows a structured for - mat that allows readers to quickly locate reliable guid - ance on common issues and to compare approaches across markets. M&A is now scrutinised through multiple, overlapping lenses. Traditional merger control remains central, but it increasingly sits alongside foreign direct investment (FDI) and national security screening, sector-specific change-of-control approvals, and a wider ecosystem of regulatory and private litigation risk. These regimes have become more expansive, with more procedural steps to be taken, even as they have become more important for the eventual outcome of a deal than ever. In many transactions, the legal “closing path” is no longer a single filing or a predictable timetable, but a co-ordinated programme of regulatory engage - ment across several authorities, often in multiple juris - dictions, and frequently under public and third-party pressure. This guide responds to that reality. It maps the regu - latory architecture that governs M&A approvals and the dispute landscape that follows when deals are challenged, delayed, conditioned or blocked. It is intended to be used at the points where practical deci - sions must be made: whether a transaction is notifi - able, where it should be filed, how long review may take, what substantive concerns are likely to arise, which remedies are realistically negotiable, and how to allocate risk in the transaction documents. Just as importantly, it addresses what happens when those processes become contentious – whether between the parties; with regulators; or through court proceed - ings brought by shareholders, competitors or other stakeholders.

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