Open call for evidence

Reviewing our approach to assessing merger efficiencies

• From: Competition and Markets Authority
• Published: 15 January 2026

Summary

The Competition and Markets Authority (CMA) is inviting views on its approach to assessing rivalry-enhancing efficiencies in mergers.

This call for evidence is being held on another website.

This call for evidence closes at
5pm on 26 February 2026

Call for evidence 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 October 2025, we published updated guidance on our approach to jurisdiction and procedure, to clarify our approach to jurisdiction and global deals. In December, we published updated guidance on our approach to merger remedies.

We are now launching a review into our approach to the assessment of rivalry-enhancing efficiencies in mergers, as part of our ongoing commitment to support growth, investment, and business confidence across the UK economy.

We are seeking your views and evidence on:

• the CMA’s analytical approach to rivalry-enhancing efficiencies, including the types of evidence we consider and how we assess dynamic efficiencies
• the CMA’s process for assessing rivalry-enhancing efficiencies, including how we engage with merging parties on efficiency claims

Published 15 January 2026