This research has been funded by Special Account for Research Grants of University of Western Macedonia (UoWM Koila-Kozani, Greece), under the framework of the Project entitled "The Foreign Direct Investment in the form of Mergers and Acquisitions on a Domestic and Cross-border basis as a Lever for the Development of the Greek Economy and as a Strategy for the Expansion of Enterprises and Financial Institutions". (Project no. ELKE-80327). | Risk management after mergers and acquisitions. evidence from the Greek banking system