As a country on the way to integration with the European Union (EU), Turkey has been following EU principles in establishing and improving its merger control regime, as well as overall competition law, keeping pace with changes in relevant EU legislation and case law. This book presents, for the first time, a description and analysis of the relationship between the EU and Turkish merger control law and practice. The second edition of the book considers the legislative changes that occurred in 2020-2021, including the reform of the Turkish Competition Law which introduced the significant impediment to effective competition (SIEC) test into the Turkish concentration control. The authors-all three, both practicing lawyers and academicians in Turkey-focus on comparing substantive, procedural and jurisdictional issues and draw parallels on their regulation in the two jurisdictions. These matters include the following: determining whether a transaction shall be regarded as a notifiable merger, hence be subject to control; financial thresholds used for allocating jurisdictions; extraterritoriality of merger control; relationship between the SIEC test and the dominance test; determination of the relevant market; techniques used for assessment of horizontal and non-horizontal mergers; notification requirements; procedural duties of competition authorities in relation to remedies; third-party rights; gun-jumping fines and other sanctions for failure to comply with merger control requirements; and peculiarities of assessment of mergers in the Big Data world. Each chapter provides an overview of the respective issues in the EU and Turkey, projecting a clear understanding of the main similarities and differences in the two regimes. A notable feature is an in-depth analysis of applicable case law concerning each issue, with most of the Turkish decisions available in English for the first time. The book's comparative approach will prove to be of great value. With its clear answers to questions about what transactions are subject to merger control, what criteria are used in assessing those transactions, and the main issues that a foreign company should be aware of while merging with another foreign company with effect in Turkey and/or EU, the book will be of immeasurable value for lawyers and their business clients dealing with multijurisdictional merger cases. Interested academics and policymakers will also find much here to attract their attention.