This paper uses unique new data for German manufacturing enterprises from matched regular surveys and a special purpose survey to investigate the causal effect of relocation of activities to a foreign country on firm performance. Compared to non-offshoring firms, firms that relocated activities were larger and more productive, and had a higher share of exports in total sales. These differences existed the year before some firms started to relocate, and this points to self-selection of "better" firms into offshoring. To investigate the causal effects of offshoring, six different variants of a matching approach are used. Contrary to what is often argued we find no evidence for a large negative causal effect of offshoring on employment in Germany.