Vice epistemology studies the qualities of individuals and collectives that undermine the creation, sharing, and storing of knowledge. There is no settled understanding of which epistemic vices exist at the collective level. Yet understanding which collective epistemic vices exist is important, both to facilitate research on the antecedents and effects of collective epistemic vice, and to advance philosophical discussions such as whether some collective epistemic vices are genuinely collective. I propose an empirical approach to identifying epistemic vices in corporations, analyzing (...) a large dataset of online employee reviews. The approach has parallels to the methodology for identifying the big-five personality traits. It surfaces epistemic vices that are attributed to corporations by its own members and reduces the number of vices to the minimum required to describe differences between corporations. This approach yields a new taxonomy of epistemic vices for corporations. While two vices identified have close correlates in the existing literature, four others have not been identified at all or only in aspects. Two of these vices are ‘genuinely’ collective in the sense that they can only be attributed to collectives. (shrink)