Insider-trading meaning

The buying or selling of a company's stock by one who has access to information not made public: trading based on such information is typically illegal.

The illegal buying or selling of securities on the basis of information that is unavailable to the public.

Trading by people who have access to material, non-public information that allows them to make a substantial profit by either buying or selling the company’s securities (usually stock). Insider trading is strictly prohibited by securities law and violators are subject to large fines and jail time.