This document summarizes research on concentration and deconcentration patterns in European container ports from 2007-2012. It begins with an introduction that provides background on changes in maritime trade and adoption of containerization. It then reviews previous studies on port concentration and defines key terms. The document outlines factors that drive concentration and deconcentration. It describes the methodology used, including construction of a database, defining port ranges, and quantitative/qualitative analysis. The empirical analysis examines concentration levels in different European port ranges from 2007-2012 and interprets results based on identified concentration factors. Finally, it discusses findings, limitations, conclusions, and areas for further research.