INTRODUCTION Contributed by: Frank Aquila, Sullivan & Cromwell LLP
assessed, and how extraterritorial enforcement risk is managed. • How parallel regimes interact – sequencing, co- ordination, information-sharing, and how to man - age inconsistent demands or timelines across regulators. Regulatory strategy and early risk assessment Effective regulatory planning begins before signing. Parties need to identify likely filing obligations, assess substantive exposure, and determine which authori - ties will be most influential. This includes understand - ing not only thresholds and formal jurisdiction, but also informal expectations, such as when voluntary filings are “strongly recommended”, and when pre- notification engagement is essential to keep a trans - action on track. Regulatory timetables can dictate deal viability. The guide provides practical insight into review phases and timelines and the information requirements that often expand during an investigation. It explains the purpose and practice of pre-notification, what authori - ties tend to focus on in early engagement, and how parties can reduce execution risk through coherent document strategy and internal preparedness. Substantive analysis in merger control: theories of harm and remedies Substantive analysis has become a vital part of merg - er control, particularly where transactions involve digital ecosystems, vertical integration, conglomer - ate effects, nascent competition or innovation. The guide covers the applicable substantive tests and how they are applied in practice, the theories of harm most commonly examined, and the evidentiary expecta - tions around efficiencies and failing firm arguments. National security screening, geopolitical sensitivity and sectoral approvals The guide explains how FDI and national security regimes are structured, what triggers filings, when voluntary notifications are advisable, and how mitiga - tion measures are imposed ranging from governance controls and information barriers to local data stor - age, operational restrictions or carve-outs of sensitive assets
In regulated sectors such as financial services, energy, telecoms, aviation and media, sectoral regulators can have decisive influence. The guide summarises the approval processes, typical timelines, the substantive standards applied (such as prudential soundness and fitness and propriety), and how sectoral reviews are co-ordinated with merger control and national security screening. It also flags practical pitfalls that repeatedly disrupt timelines, such as incomplete filings, insuffi - cient stakeholder planning or overly rigid transaction documentation. Disputes: from deal friction to courtroom outcomes Even well-planned deals can become contentious. The guide therefore treats disputes as a core feature of modern M&A, not an afterthought. It covers M&A litigation relating to substantive deal issues, including the frequency and types of disputes, challenges to governance and disclosure, broken- deal litigation, and disputes over termination rights and conditions. It analyses how courts and tribunals approach material adverse change/effect clauses, what standards are applied to efforts obligations, and how disputes over remedies or regulatory strategy are resolved. It also surveys the forums commonly used – courts, arbitration and specialist tribunals – and the availability of interim relief, specific performance, injunctions and damages. Separate attention is given to litigation relating to reg - ulatory decisions, including judicial challenges to pro - hibitions, conditional clearances and fines. The guide addresses standing (including third-party access), the standard of review and deference to regulators’ technical assessment, the availability of suspensive relief pending appeal, and how public law challenges interact with private damages actions. Finally, the guide examines private enforcement and competition/regulatory claims connected to M&A con - duct – such as gun-jumping, information exchange and alleged co-ordination – alongside collective actions, limitation issues, causation and quantifica - tion. It also considers settlement pathways, mediation and arbitration, recognising the growing role of ADR in high-stakes disputes.
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