In economics and finance, market abuse may arise in circumstances where investors in a financial market have been unreasonably disadvantaged, directly or indirectly, by others who: have used information which is not publicly available have distorted the price-setting mechanism of financial instruments have disseminated false or misleading information Market abuse is split into two different aspects : Insider dealing: where a person who has information not available to other investors makes use of that information for personal gain Market manipulation: where a person knowingly gives out false or misleading information in order to influence the price of a share for personal gainIn 2013/2014, the EU updated its legislation on market abuse, and harmonised criminal sanctions. Wikipedia