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SummaryTwo ®eld studies were undertaken to investigate the nature of the relationships between job security, job satisfaction, organizational commitment, and withdrawal cognitions. Study 1 was conducted in an organization immediately following its acquisition by another company N 137. Study 2 was conducted in an organization that had experienced a number of layos and expected more in the future N 188. Covariance structure analysis was used to test for direct, complete mediating, and partial mediating eects. Study 2 was used to cross-validate the ®ndings from study 1. Results from both studies provide strong support for the proposition that job satisfaction and organizational commitment mediate the eects of job security on withdrawal cognitions. The two studies diverge when explicating the nature of the relations between job security, satisfaction, and commitment. Study 1 suggests job satisfaction completely mediates the eects of job security on commitment. Study 2 suggests that both satisfaction and commitment mediate the relationship between job security and withdrawal cognitions. Contextual dierences that may have contributed to these ®ndings are discussed.