Purpose – The purpose of this paper is to present the learnings of a broker organization that started a new Population Health Management initiative in two regions in the Netherlands. The research... Show morePurpose – The purpose of this paper is to present the learnings of a broker organization that started a new Population Health Management initiative in two regions in the Netherlands. The research focusses on the role of the broker organization itself in supporting stakeholders in the region to adopt a new implementation strategy designed by the broker organisation itself. The basis of this model was to organize, finance and monitor differently to improve the overall health of the population. Design/methodology/approach – An action research approach was chosen to support the endeavours of the broker organization and to acquire practical knowledge on the role of a third-party in PHM implementation. Qualitative data were collected from documentary analysis, focus groups, logbooks and observational data from team meetings. Findings – The main result is that the role of the broker organization to implement PHM was subject to change during the more than two years of the research. Several themes emerged that influenced these role changes, both internal and external, showing the complexity of providing PHM implementation support as a third-party to regional stakeholders. Practical implications – We hypothesize that the role of a third-party changes depending on the maturity of the regional collaboration. The complexity of the transition in healthcare calls for constant adaptations, and thus learning and reflection, from all involved. Action research is a strong tool for this. Originality/value – This paper is one of the first to report on the role of a third-party in PHM implementation. The action research methodology offered the right amount of flexibility to adhere to the complexity of the context and provided rich insights. Show less