The European Union’s 27 member states have taken an inconsistent approach to new laws aimed at cracking down on insider dealing, meaning that compliance requirements across the trading bloc vary widely, according to European securities regulators.

The EU agreed to a common legal approach to insider dealing and stock mark manipulation seven years ago in an effort to create a level playing field across its member countries. But a report from CESR, a grouping of securities regulators, says that has not happened.