Report anti-competitive business practices

Business: Sale Goods Services Data

    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.

    Fill in the form to report anti-competitive practices and send it to

    You can also call the CMA to make a report.

    CMA enquiries centre
    0203 738 6000

    Industry authorities

    You can report concerns about anti-competitive behaviour in certain sectors to an industry authority. These are:

    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.

    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.

    CMA cartels hotline
    Telephone: 0800 085 1664 or 020 3738 6888

    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.

    Unfair agreements between businesses – price-fixing, cartels and reporting unfair practices to the Competition and Mergers Authority (CMA)