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The study focuses on the relationship between job insecurity and self‐reported job performance. Based on theoretical, empirical, and statistical arguments, we propose that this relationship is U‐shaped and mediated by vigour at work. This assumption was tested cross‐sectionally and across two measurement points, and against two alternative explanations, namely that the U‐shaped relationship might be due to the influence of the moderators optimism and supervisory support. The findings of a study among a large group of job‐insecure employees of two Finish universities (n = 2,095) confirm the U‐shaped effect of job insecurity on self‐reported job performance. This effect was shown to be robust against the moderating influence of optimism and supervisory support and was partially explained by decreased vigour. The inclusion of a second data wave indicated that job insecurity predicted job performance 1 …