This paper focuses on the synchronization of business cycles among European Union countries. The co-movements of economic growth and foreign direct investments are examined for the EU Three different periods of business cycles are compared and three sub-groups for the sample and the whole period are constructed, a core and a periphery group as in Campos and Macchiarell, Economics Letters, 2016, 147, 127-130, and a new entry group. To assess the robustness of the results, the business cycles were estimated by using the Hodrick-Prescott,