Stop unfair cartels

Cartels are formed when businesses agree not to compete with each other.

Cartels are unfair. They cheat customers, who end up paying more for lower quality goods and services. That’s why they are illegal and it’s our job at the CMA to stop them.

If you’ve witnessed or been involved in a cartel, tell us about it and help us make markets fairer.

Please call us if you’ve seen a cartel in action | Contact us | CMA

020 3738 6888

Call the cartels hotline if you suspect cartel activity.

Apply for leniency if you have been part of a cartel | Contact us | CMA

020 3738 6833

And if you’ve been directly involved, call our leniency line.


We need your help

Please get in touch if you’ve seen a cartel in action. Even if you’re not 100% sure, you should still contact us. We’ll keep your identity in the strictest confidence and you could even earn a reward.

If you have been involved with a cartel, speaking to us is the safest thing you can do. Because if you tell us about a cartel before anyone else does, you could avoid fines, director disqualification and even prison.

If you’re still not sure if you should contact us, find out more about cartels in the videos below.

 

What is a cartel?

Find out what cartels involve, and what the consequences are if you’re actually caught in one.

Cartels are illegal and bad for the UK

Discover how anti-competitive behaviour can break the law.

Take Our Quiz | Cartels Quiz | CMA

Take our quiz

How much do you really know about cartels?

Check you’re not at risk by taking our quiz.


Real-life cartel examples

Help Us Fight Unfair Cartels | CMA

Report to us

Help us make markets fairer. Your information, however small, can be valuable when added to other information we hold.

Learn more about reporting to us and how we investigate cases.

Public Concern At Work support the CMA's Cartels Campaign

Public Concern At Work

PCAW are an independent whistleblowing charity who are able to provide confidential advice to workers who are unsure whether or how to raise a public interest concern.

Please call us if you’ve seen a cartel in action | Contact us | CMA

020 3738 6888

Call the cartels hotline if you suspect cartel activity.

Apply for leniency if you have been part of a cartel | Contact us | CMA

020 3738 6833

And if you’ve been directly involved, call our leniency line.

When It Comes To Cartels, Do What's Right | CMA