This thesis is an inductive case study of Security Pluralization and what this means for the construction of insecurity and threats through Huysmans theory of diffuse security and insecurity. The thesis will furthermore build upon existing conceptualizations of pluralized security. At the core of this work lies an inductive analysis of empirical material which is twofold and consists of interviews with individuals who are responsible for security in eight centralized harbors and documents produced by private security agents. The investigation illustrates that the pluralization of security in Swedish harbors effects how insecurity is perceived there. Part of these results are derived from the observation that private security companies are reiterating narratives of insecurity, which affects the harbors perception of threats. Furthermore, private security companies have social, economic, and symbolic capital which can be translated into legitimacy, authority, and power, which in turn can affect the state’s monopoly of violence. Consequently, Police’s authority is at risk of being challenged by the authority of the private security companies.