The aim of this research is to analyze the contribution of investor relationship management (IRM) in the process of territorial anchoring of foreign companies. We formulate our problem as follows: " How can territorial managers encourage the establishment of foreign companies by activating the levers of Investor Relationship Management (IRM)? " ? The exploration of the contribution of relational territorial marketing, operationalized by the GRI, to the anchoring of foreign companies is carried out thanks to a unique case study that focuses on the economic capital of Morocco (Casablanca). This choice is based on a qualitative approach that is in line with our interpretative epistemological posture. The results of this research are based on the confirmation of four main research proposals resulting from the literature review and which concern trust, commitment, satisfaction and territorial public communication. The use of these levers by territorial managers is able to participate in a dynamic of territorial anchoring of foreign companies in a context where the attractiveness of the territory alone is no longer sufficient. Territorial anchoring is becoming a strategic objective, given the exacerbation of competition between territories and the growing mobility of territories. Consequently, territorial managers have every interest in setting up a relational strategy to ensure that their relationships with foreign investors are built over time, a strategy driven by the objective of establishing a spatial, reticular and teleological territorial footing. Our main contribution is to highlight the pillars of a GRI that can help foreign companies to establish themselves in their localities. This result is the result of extrapolating relationship marketing and CRM to territorial marketing.