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Knowledge exchange and integration across group boundaries are critical for knowledge intensive organizations. Prior research has investigated boundary-spanning ties on the individual as well as on the group level, neglecting, however, the question of how individual boundary spanning shapes and contributes to inter-group knowledge integration. In our study, we address this gap by integrating boundary-spanning literature with literature on group information processing and suggest that, contrary to the perspective taken by earlier research, not all individual boundary spanning ties equally contribute to inter-group knowledge integration. Rather, we hypothesize that the effect of individual boundary spanning ties on inter-group knowledge integration depends on the individuals’ positions in their groups’ transactive memory systems. We tested our predictions in a network study of 457 engineering …