This article explores the profiles and practices of interest representatives of the port sector. It shows they are not a homogenous group. Whilst a minority holds the resources and masters the know-how and the know-how-to-be specific to the European administrative and political field, most of them are not based in Brussels and partake only occasionally in lobbying activities. The article goes on to demonstrate the group is in the process of Europeanisation—though to a limited extent, and in connection with the legislative agenda—through the experience gained in participating in negotiations at the EU level and the gradual specialisation of the recruitment. It further explores how the occasional interest representatives overcome their shortage in resources and know-how adapted to the European administrative and political field by mobilising protest actions, by outsourcing the representation of their interests to lobbying firms, or by putting forward resources gained in the national administrative and political field. This article draws on its author’s involvement in the negotiations of the “port services” regulation from 2013 to 2017 as an interest representative of two French port organisations, in a lobbying firm.