This thesis reports the findings of a qualitative analyzed empirical case study of an organization that was facing a radical innovation opportunity which initiated a process of multi-identity formation and enabled the observed organization to successfully realize the innovation opportunity. Proceedings during this period of multi-identity formation were examined and findings revealed that radical innovations can constitute triggers for multi-identity emergence. Also, the emergent model of multi-identity formation centered around a new concept of identity establishment which describes efforts of legitimization in regard to the prevailing core identity. This thesis contributes to the academic literature stream on organizational identity formation and change, as well as the academic literature stream on the identity-innovation relationship.