This study advances the understanding of how knowledge-flows impact on firm performance. Incorporating recent research on the knowledge-based view of the firm, this paper tests and extends the knowledge flow model by using more fine-grained measures and by proposing a nonlinear effect. This study tests the predicted effects in a longitudinal research design with data on a global sample of public biopharmaceutical firms. The results largely support the expectation that knowledge-flows largely have a nonlinear impact on firm performance. However, one traditional measure of knowledge-flows, geographical location, turns out to have no significant influence in the extended model. The paper explains the implications of these findings for practice and research