This study examined the effects of dark side leader personality traits on objective team performance, and the moderating role of leader mood. Leaders from a large international bank completed assessments measuring dark side personality using the Hogan Development Survey and mood using the Job-related Affective Well-being Scale. Certain dark traits like excitable and reserved seemed to positively relate to team productivity in positive moods but negatively in negative moods. Imaginative and mischievous seemed to positively relate to sales in positive moods but negatively in negative moods. Bold seemed to positively relate to productivity in negative moods, while diligent negatively related to sales in negative moods and dutiful positively related to sales in negative moods.