This article discusses the widespread adoption of leniency programmes by antitrust agencies around the world to root out cartel activity, which is generally seen as the most pernicious anti-competitive activity. As a consequence, companies seeking leniency may be compelled to report cartel activity in several jurisdictions, so as to maximise the benefit of applying for leniency in the most relevant jurisdiction.

The article highlights the risk where leniency is not sought in a jurisdiction where a cartel may have had a material effect, and provides an introduction to the leniency programmes of two major jurisdictions, the US and the European Union (EU).