This article aims at understanding the mechanisms of coordination inside a particular market, that of the intermediaries in companies’ deals, whose activity takes place in a field made up of several occupations, organizations, markets and regulations. To seize the way these multiple and diversified actors can produce the market of companies’ deals, and its growth, the article analyses these intermediaries as a social world, in the sense proposed by Howard Becker, at the crossroad of common material equipments and interpersonal links. In this perspective, the market of the companies’ deals shows as a set of many entwined secondary markets coordinated by a mise en abyme effect.