When you decide to merge businesses, through takeover, acquisition or a joint venture, you may be reducing competition in the market(s) in which you operate. If it is found that your merger will substantially lessen competition it may be prohibited or you may have conditions imposed upon you.

The Competition and Markets Authority (CMA) is responsible for investigating mergers in the UK. The Secretary of State for the Department for Business, Energy and Industrial Strategy (BEIS) may also consider and refer to the CMA any mergers which raise wider public interest concerns - mainly in the defence, media or certain financial markets. Mergers are only investigated if they meet certain criteria. If you are involved in a merger of any size, you will need legal advice.

This guide will explain what to do if you are involved in a merger above a certain size.