Guidance
Guidance for businesses
Information on growing your business, selling products or services, and engaging with the Competition and Markets Authority (CMA).
Guidance for businesses
| Merging your business | What you need to know if you’re thinking about a merger, or already going through a merger investigation |
| Provide information to the CMA | Tell us about an issue or provide evidence |
| Selling products and services | How to treat consumers fairly |
| Cartels: come forward and apply for leniency | How to apply for leniency if you have been involved in a cartel |
| Report a competition or market problem to the CMA | Tell us about a competition or market problem |
| Make a whistleblower report | Tell us about any suspected illegal activities or suspicious behaviour |
About the CMA
The CMA helps people, businesses and the UK economy by promoting competitive markets and tackling unfair behaviour, and by ensuring that the UK offers a level playing field on which innovation and investment will be fairly rewarded.
Read more about the CMA and what we do.
Updates to this page
Published 10 June 2025