The economic sector described in this paper is the equine sector and more particularly the horse racing activity, whose organization lies in codes, practices and networks specific to a close-knit professional and social community. Relying on the interactionist sociology of professions and the sociology of markets, the paper analyses how environmental changes generate professional opportunities and the structuration into professional groups. The authors precisely point out one new-born profession: the profession of jockeys’ agent. Based on a qualitative approach, the paper firstly presents the context of the study to explain the evolution of the racing industry in recent decades. Then the paper observes the daily tasks and missions of agents and analyzes the construction of a collective and thus professional territory. The authors describe the transformation of a work organization based on a dual employer/employee relationship into an entrepreneurial model and the socio organizational consequences. In a perspective of future research, the authors link the two concepts of intermediation and market by demonstrating that the presence of intermediary agents contributes to the establishment, to the construction of a new market: that of the jockeys.
