Guidance
Merging your business
What to do if you're thinking about a merger, or already going through a merger investigation.
The Competition and Markets Authority (CMA) investigates some mergers and assesses how they could affect competition in the UK.
This page links to helpful information if you:
- are thinking about merging your business with another one
- have recently started or completed a merger
- are already involved in a CMA merger investigation
What you need to know
| How mergers are investigated | What happens if we investigate your merger, and how long it takes |
| How we鈥檒l engage with you | How we鈥檒l engage with you and your advisors during an investigation |
| Interim measures | How we might impose temporary restrictions before or while we investigate your merger |
Tell us about a merger
| Tell us about your merger | How to tell the CMA about a planned or completed merger, and why this matters |
| Submit a case team request form for your merger | Use this form to have a CMA case team allocated to your merger |
| Merger notice form | Use this form to notify your merger to us |
If we鈥檙e investigating your merger
| Internal document requests | When and how we might request internal documents from you during our investigation |
| Remedies | How we might choose, design and implement remedies, if we have concerns about your merger |
| Propose remedies at phase 1 | Use this form to propose remedies (or 鈥榰ndertakings in lieu of reference鈥�) during a phase 1 investigation |
| Propose remedies at phase 2 | Use this form to propose remedies during a phase 2 investigation |
Engaging with us during an investigation
Engaging the decision maker
What the CMA鈥檚 decision maker is looking for and would find most helpful.
Meeting with the CMA
What to expect when meeting with the CMA.
Sending submissions
What to think about when submitting information to us.
Updates to this page
Published 10 June 2025