Consultation outcome
Draft revised guidance on our approach to assessing merger efficiencies
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Detail of outcome
The Competition and Markets Authority (CMA) has published updated merger assessment guidelines, which incorporate our final revised guidance on merger efficiencies.
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Original consultation
Consultation description
The CMA has been delivering a programme of work to embed our 4Ps framework – pace, predictability, proportionality, and process – across our merger control function.
In January 2026, we launched a review into our approach to the assessment of rivalry-enhancing efficiencies in mergers.
We then consulted on proposed updates to our guidelines.
We published:
- draft revised guidance, intended to replace the text currently in paragraphs 8.2 to 8.27 of our Merger Assessment Guidelines
- a consultation document, which summarised the key changes proposed in the draft revised guidance
We also published the responses to our call for evidence.
Documents
Updates to this page
Published 3 June 2026
Last updated 3 September 2026
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Final outcome and responses published.
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First published.