Globalization has encouraged merger and acquisitions (M&As) across countries. We propose a theoretical model that explains the process through which employees adapt to changes introduced by cross-border M&As. Empirical analyses based on 174 Chinese employees who experienced an unexpected M&A initiated by a Western company suggest that the relationship between change management practices (i.e., provision of training and assurance of job security) and post-change performance is mediated by employees’ person–change (P–C) fit perceptions. Integrating the quantitative results with interviews, we further theorize that underlying cultural dynamics (e.g., collectivism and Confucian doctrines) drive change-related attitudes and behavior among Chinese employees.