Mobility, risk, security, freedom and technology are prominent key words in most of the debates on the current practices of data-sharing in the European Union (EU) – United States (US) context. Even more, transatlantic data-sharing and processing is probably among the best examples to show the interconnections, and tensions, among them. No single transatlantic agreement covers all these issues, but ‘immigration management’ and ‘national security’ are the subjects of a vast array of legal and technological instruments relying on the processing of personal data. Looking at these practices permits us to understand how human mobility is conceptualized by states and states’ agencies.