This article addresses the general question as to which competencies employees need to possess in order to engage in self-management in their career development. The authors distinguished and operationalized 6 career factors and competencies of self-management in career development. A quantitative study was performed using 1,579 employees in 16 Dutch companies to investigate the relationship between career competencies and career success. The results indicate that, among others, the factors career control and networking are strongly associated with career success. The results are discussed with respect to the facilitation organizations can provide for their employees' career actualization. (Contains 2 tables.)