This paper addresses the question of how it is possible, despite the persuasive characteristics of the business partner role, to explain the prevalence of hybrid accountants in management accounting practice. This research question is addressed from an institutional theory vantage point, suggesting that institutional drivers exist in every organization that shape the role of the practicing actors. The empirical evidence presented is drawn from a case study of a mining company pursuing a change program to transform its management accountants into business partners. The results illustrate how the hybrid accountant role is formed through an interplay among regulative, normative, and cognitive institutional drivers that influence the role of the management accountants in opposing directions. Because of the tension between facilitating and impeding institutional drivers, the change program toward business partnering results in a hybrid accountant role which is characterized by a combination of traditional and business partner traits. Hence, the conclusions suggest that the prevalence of hybrid accountants in management accounting practice can be explained by tensions between opposing institutional drivers that contribute to a compound role.