Transparency is an underpinning of workplace ethics. However, most of the existing research has focused on the relationship between leader transparency and its consequences. Drawing on social and self-regulation theory research, we examine the antecedents of followers’ transparency. Specifically, we propose that followers have higher levels of transparency when they are working with peers who have a high level of transparency. We further suggest that followers’ conscientiousness and agreeableness moderate the relationship between peer transparency and followers’ transparency. Using a time-lagged (...) design, we provide support for the proposed theoretical model. We found that follower conscientiousness substitutes the social regulation effect, while follower agreeableness enhances this social regulation effect. Theoretical and practical implications of these findings are also discussed. (shrink)