Guidance
Merger assessment guidelines
The Competition and Markets Authority’s (CMA) approach to assessing mergers.
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The CMA is reviewing its approach to assessing rivalry-enhancing efficiencies in mergers. Share your views by 26 February 2026.
These guidelines set out the CMA’s approach when investigating mergers.
The guidelines are designed to help companies and their advisers assess if competition concerns might arise in a merger.
We updated this guidance on 18 March 2021 after consulting on updates.
Updates to this page
Published 1 September 2010
Last updated 18 March 2021
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Updated merger assessment guidelines published.
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First published.