Report businesses that you think are acting in an anti-competitive way to the Competition and Markets Authority (CMA).
The Office of Fair Trading (OFT) has closed and the CMA deals with anti-competitive business practices.
You can also call the CMA to make a report.
CMA enquiries centre
0203 738 6000
Find out about call charges
You can report concerns about anti-competitive behaviour in certain sectors to an industry authority. These are:
- Civil Aviation Authority for airports and air traffic services
- Monitor for health services in England
- Utility Regulator for gas, electricity, water and sewerage in Northern Ireland
- Ofcom for television, radio, telephone, postal and internet services
- Ofgem for gas and electricity in England, Wales and Scotland
- Ofwat for water and sewage services in England and Wales
- Office of Rail Regulation for railways in England, Wales and Scotland
Types of anti-competitive behaviour
Anti-competitive agreements can include price-fixing, limiting production to drive up prices, agreeing not to sell to a competitor’s customers.
These agreements can be formal or informal and may include ‘shared understandings’,‘concerted practices’ or ‘gentleman’s agreements’ where businesses cooperate or act together.
You should also report businesses that abuse a dominant market position - eg by offering unfair prices to customers or suppliers, refusing to supply, or limiting production.
Find out more about anti-competitive behaviour by reading the guides on:
- competing fairly and competition law
- agreements and concerted practices
- abuse of a dominant position
Report a cartel
A cartel is an agreement between businesses about not competing with each other - eg by price-fixing, bid-rigging, output quotas or restrictions, or market-sharing arrangements. Cartels are usually secret.
You may get a financial reward for information that leads to an investigation.
Read the guide cartels and the Competition Act for more information.
You may be treated with leniency if you report a cartel you’ve been involved with.
Businesses may be fined up to 10% of their worldwide turnover if they enter into an anti-competitive agreement or abuse a dominant market position.
You may be fined or sent to prison for up to 5 years if you are involved in cartel activity. Company directors may be disqualified from being a director for up to 15 years.