Insider Trading

Insider trading is the offense of buying or selling a publicly traded company's securities on the basis of material, non-public information about that company, in breach of a duty of trust owed to the company or its shareholders, giving the trader an unfair informational advantage over other market participants. Illegal insider trading is generally distinguished from lawful trading by corporate insiders, such as executives buying or selling their own company's stock through properly disclosed and regulated channels, with the dividing line turning on whether the trader possessed and acted on undisclosed material information rather than on their formal insider status alone. The offense is treated as a core securities-fraud category because it undermines the principle that public securities markets should operate on a reasonably level informational playing field, and its enforcement, typically led by a jurisdiction's securities regulator working alongside criminal prosecutors, relies heavily on trading-pattern analysis and communications evidence to establish that a trader both possessed non-public information and traded because of it. Insider trading is a frequently studied case within white-collar crime scholarship both for the difficulty of proving the required knowledge and causal link between information and trade, and for the ongoing debate among economists and legal scholars over how significantly it actually harms market efficiency compared with its symbolic importance to public confidence in fair markets.