Based on Freeman's model of interest group‐driven migration policies, the article gives a qualitative inside look on a neglected actor during the formative years of US immigration reform. It analyzes the central role of the shipping companies in coordinating the pro‐immigration campaign with and against other interest groups. Their lobbying is divided into two complementary sections: inside top‐down efforts (lobbyists) to influence legislators and outside bottom‐up efforts (migrant communities and the press) to mobilize the public. It assesses the importance of public opinion in their lobby campaigns and the shipping companies’ success in delaying far‐reaching restrictions until 1917.