Merger assessment guidelines
The Competition and Markets Authority’s (CMA) approach to assessing mergers.
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We updated thisthese guidanceguidelines on 18 March 2021 after consulting on updates.
Updates to this page
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Guidance on merger efficiencies updated.
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Consultation published on draft revised guidance on our approach to efficiencies
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Updated merger assessment guidelines published.
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First published.
Update history
2026-09-03 12:06
Guidance on merger efficiencies updated.
2026-06-03 11:01
Consultation published on draft revised guidance on our approach to efficiencies