Contact the CMA
Tell the CMA about issues with a business or market, or provide information about a new or existing case.
The CMA cannot step in or advise on individual complaints.
Use this service to tell the Competition and Markets Authority (CMA) about issues with a business, a market, or to provide information and evidence about a new or existing case.
Do not use this service if you’re seeking immediate advice and support. Contact the relevant consumer advice organisation in your area (opens in a new tab).
Do not use this service if you are making a whistleblower report. Contact us through our whistleblower service instead.
Information you will need
You will be asked to provide:
- a description of the issue, including its impact
- any supporting evidence you have
- details about yourself and, if applicable, your organisation
The information you share with us will be used by the CMA and other organisations, to monitor and possibly take action to stop unfair business behaviour.
How we use your information
As part of your report, you can choose to provide contact details to the CMA.
If you provide these details, the CMA will be processing your personal data. ‘Personal data’ is information which relates to an individual who can be identified from it.
We take all reports seriously. If you wish to make your report anonymously it will be handled in line with our personal information charter (opens in a new tab) (also known as privacy notice).
What happens next
After you’ve submitted your complaint to us, you’ll receive an automated response via email and we’ll review all the information you provide.
We cannot respond in detail to individual complaints, but using your information we may:
- contact businesses involved with your submission
- investigate and take legal action against businesses
- conduct studies or investigations into markets
- prosecute people involved with cartels
If we decide to open a formal enforcement case, we may contact you and give you the opportunity to comment on it. We will contact you if we need to rely on the information you’ve provided to open the case. If you have any questions or concerns, please contact us at general.enquiries@cma.gov.uk.
When the CMA takes part in criminal enforcement work, it acts in accordance with the duties set out in chapter 5 of the code of practice for victims of crime (victims code).