Companies become implicated in human trafficking either in their supply-chain when suppliers and sub-contractors engage in trafficking or related forced labour, or directly in their operations, when, for example, they transport or harbour victims. This article describes initiatives and tools developed to measure the extent to which companies meet their responsibility in relation to human trafficking.  According to the ILO there are 21 million forced labourers, of which 19 million are exploited by private enterprises or individuals for economic activities. Most business sectors are at risk of coming into contact with human trafficking and forced labour within their extensive supply chains.