In the past half century, the theory of the firm has become a specific and prolific research field. However, the social ontology of this central institution of capitalism has never truly been the subject of investigation. I consider this negligence harmful for organizational economics and management and, more broadly, for the social sciences, notably because the first and central question raised by the theory of the firm relates to its nature: What is a firm? For this reason, I propose some (...) novel considerations for a social ontology of the firm by focusing on social emergence, reconstitution, the two-level institutional logic of the firm, complex organizational dynamics and interacting mechanisms, and power. (shrink)