Both the rising dominance of large platforms in data markets and the increasing exchange of personal data among organizations within data ecosystems have led to significant asymmetries. Individuals have limited control over data-related decisions and restricted access to the value generated from data use. Scholars have called for data intermediaries to help address these asymmetries, yet little research has examined how their business models function within data ecosystems that facilitate personal data exchange. This study examines the key characteristics and archetypes of data intermediary business models that enable the exchange of personal data. Using Nickerson's taxonomy development method and Al-Debei and Avison's V4 business model ontology, the research develops a taxonomy of data intermediary business models in data ecosystems centered on personal data exchange and derives archetypes through hierarchical clustering. The identified taxonomy dimensions clarify how these business models operate and create value within personal data ecosystems from a network-level business model perspective. Based on this framework, eight archetypes are identified, illustrating how data intermediaries prioritize interests of different ecosystem actors.