insider trading
noun[U]
ukus(UKinsider dealing)STOCK MARKET,LAW
theillegalbuyingandsellingofcompanysharesbypeoplewho havespecialinformationbecause they areinvolvedwith thecompany:
The company'sexecutivesanditsaccountantsareaccusedoffalsifyingfinancialstatementsandengagingininsidertrading.