Guidance and regulation

Guidance for businesses and their advisers on CMA's procedures for operating the merger control regime under the Enterprise Act 2002.

• From: Competition and Markets Authority
• Updated: 4 January 2022

Guidelines for businesses and their advisors on the CMA’s substantive approach to assessing mergers.

• From: Competition and Markets Authority
• Updated: 18 March 2021

This statement is made under section 3 of the National Security and Investment Act 2021.

• From: Cabinet Office
• Updated: 2 November 2021

• National Security and Investment Act 2021: Statement for the purposes of section 3

  Introduction 1. This statement is made under section 3 of the National…

Outlines the fees payable for mergers which are investigated by the CMA, and how to pay them.

• From: Competition and Markets Authority
• Updated: 20 July 2023

The topics in the Market Guidance are based on analysis of the notifications received under the NSI Act and feedback from stakeholders on their experience of the system.

• From: Cabinet Office
• Updated: 27 April 2023

Information on procedures, potential consequences of non-notification, new and adopted CMA guidance and who to contact.

• From: Competition and Markets Authority
• Updated: 15 April 2015

How the CMA applies exceptions to the duty to refer and undertakings in lieu of reference in operating the merger control regime.

• From: Competition and Markets Authority
• Updated: 13 December 2018

Guidance on merger remedies in Phase 1 and Phase 2 investigations.

• From: Competition and Markets Authority
• Updated: 13 December 2018

This guidance concerns the CMA's activities in monitoring and enforcing compliance with final merger and market undertakings and orders.

• From: Competition and Markets Authority
• Updated: 11 May 2023

This guidance helps developers of new build downstream gas and electricity infrastructure to understand the scope of the National Security and Investment Act 2021.

• From: Cabinet Office
• Updated: 6 February 2024

Guidance for merging parties and legal advisers on the CMA’s use of Interim Measures and derogations in merger investigations.

• From: Competition and Markets Authority
• Updated: 21 December 2021

Quick guide, intended primarily for business, providing a simple overview of the UK merger regime and the CMA’s approach when reviewing mergers.

• From: Competition and Markets Authority
• Updated: 18 March 2021

Guidance for lawyers and third parties on how the CMA collects information before deciding whether to investigate a merger.

• From: Competition and Markets Authority
• Updated: 23 December 2020

Guidance on disclosure of information in merger inquiries, market investigations and reviews of undertakings and orders.

• From: Competition and Markets Authority
• Updated: 5 July 2017

Framework for analysing government’s interaction with markets, and to understand the different ways in which government can affect markets.

• From: Competition and Markets Authority
• Updated: 1 September 2009

Templates for confidentiality ring and disclosure room undertakings and disclosure room rules used in CMA investigations.

• From: Competition and Markets Authority
• Updated: 20 January 2017

Commentary on some of the most frequently asked questions from retailers and their advisers in retail mergers.

• From: Competition and Markets Authority
• Updated: 10 April 2017

Explains the CMA’s approach to the variation and termination of merger, monopoly and market final undertakings and orders.

• From: Competition and Markets Authority
• Updated: 12 August 2015

A template of a confidentiality waiver that allows discussions between the CMA and other competition authorities on multi-jurisdictional merger investigations.

• From: Competition and Markets Authority
• Updated: 23 December 2020

Guidance on requests for internal documents in merger investigations.

• From: Competition and Markets Authority
• Updated: 15 January 2019