Trade in the early modern Atlantic grew a great deal. While acknowledging that this growth had important economic, social and cultural consequences, scholars have yet to fully explain its causes. This paper argues that formal religious institutions were key. Based on records from colonial Philadelphia, it shows how the Quaker meeting created a legal forum to resolve commercial disputes. The meeting enforced its verdicts by gathering and disseminating information about disputes locally and across the Atlantic world through the Society of Friends’ formal organisation of meetings. Thereby, it re-enforced reputation mechanisms, facilitating the expansion of Philadelphia's trade.