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The Merger control Rules of the UK are contained in the Enterprise Act 2002, as amended by the Enterprise and Regulatory Reform Act 2013 and the Digital Markets, Competition and Consumers Act 2024 (DMCCA 2024). Under the UK merger control rules, the Competition and Markets Authority (CMA) has jurisdiction to review both completed and anticipated merger transactions provided there is a ‘Relevant merger situation’.

Three conditions must be met for a ‘relevant merger situation’ to exist:

1. •

   two or more enterprises (or businesses) must ‘cease to be distinct’, and

2. •

   the target's size or the merger's impact on competition is large enough to meet one of the jurisdictional threshold tests, and

3. •

   the merger is within the time limit for review.

For information on the CMA's investigation process, see The UK merger investigation process. For details of ongoing UK merger investigations, see UK mergers–case tracker.