Report a cartel to the CMA

We use some essential cookies to make this website work. We’d like to set additional cookies to understand how you use GOV.UK, remember your settings and improve government services. We also use cookies set by other sites to help us deliver content from their services. You have accepted additional cookies. You can change your cookie settings at any time. You have rejected additional cookies. You can change your cookie settings at any time. Tell the Competition and Markets Authority (CMA) about rival businesses agreeing not to compete. Use this service to tell the CMA if you know about or suspect cartel activity. You could receive a reward of up to £250,000 for information that leads to an investigation. You can tell us about businesses: agreeing not to compete with rival businesses agreeing not to hire each other’s employers (‘no-poach’) agreeing prices with competitors (price fixing) agreeing to fix employee wages with competitors agreeing to share markets or customers colluding when bidding for contracts (bid rigging) sharing commercially sensitive information with competitors submitting inflated tender bids to make others appear good value (cover pricing) Learn more about different types of cartels and read case studies where we’ve taken action against business cartels. When making your report, you can provide evidence of the cartel activity. This might include emails, screenshots or documents. If you don’t have this ready now, you can provide it later. You do not need to submit evidence to report something to us, but doing so may help us look into your report. You can choose to provide contact details or remain anonymous. We will respond once we have reviewed your information. After reviewing your report, we may: contact you for more information (if you have provided contact details) decide to take no further action investigate and take action if appropriate recommend that you contact better placed agencies or regulators refer the issue to another CMA team (this may delay a response) retain your report on file We are guided by the CMA’s prioritisation principles when we make these decisions. Tell the CMA if you or your business has been involved in a cartel. A cartel is when 2 or more rival businesses agree to act together instead of competing. Coming forward and cooperating with our investigation could protect you from the consequences of being in a cartel. Find out more about our leniency programme . Telephone: 020 3738 6833 Contents Is this page useful? Maybe Yes this page is useful No this page is not useful Thank you for your feedback Report a problem with this page Help us improve GOV.UK Do not include personal or financial information like your National Insurance number or credit card details. To help us improve GOV.UK, we’d like to know more about your visit today. Please fill in this survey (opens in a new tab and requires JavaScript ) .