As part of its mission to coordinate investigations into serious crime, Eurojust often assists national authorities in the areas of conflicts of jurisdiction and transfer of proceedings, as well as in cases involving potential ne bis in idem issues. These issues are likely to arise if parallel investigations take place in two or more Member States, unless there is cross-border coordination. Eurojust facilitates preliminary contacts and consultations between competent authorities, coordinates their actions, encourages and expedites the exchange of information, and advises on which jurisdiction is best placed to prosecute in the interests of justice.

In 2025, the Agency continued to support national authorities in preventing and resolving conflicts of jurisdiction and in preventing ne bis in idem issues.

In particular, Eurojust facilitated consultations among national authorities in at least 601 cases of parallel proceedings, in application of, inter alia, Framework Decision 948/2009 on conflicts of jurisdiction, by organising coordination meetings and providing advice to reach consensus on which jurisdiction is best placed to prosecute a specific case. It also facilitated the transfer of criminal proceedings and the transfer of evidence from one jurisdiction to another.

A significant number of these cases involved investment fraud, perpetrated online by organised criminal groups active in several countries, with thousands of victims worldwide. Eurojust assistance can be essential in cases like this to coordinate the judicial response.

Eurojust also worked on preparing for the entry into force of the 2024 Regulation on transfer of proceedings, enabling the Agency to better assist national authorities once the Regulation becomes applicable in 2027. This exercise will continue in 2026.