The PRACE project has a mandate to build the horizontal supporting infrastructure layer for the future permanent world class HPC infrastructure for the European Research Area (ERA), and to improve the knowledge needed to fully employ available resources for the European research. To efficiently contribute in the building of the European HPC Ecosystem it is necessary to reach the various stakeholders, such as national governments and research councils, and policy level stakeholders, such as ESFRI, e-IRG, European Research Council and European Science Foundation. This Deliverable presents a stakeholder analysis framework to support the creation of the petascale HPC services in Europe. Successful utilization of such complex HPC resources requires major collaboration across country and scientific disciplines borders with huge economical and human resource investments from a variety of different sources and stakeholders. The analysis of the HPC Ecosystem includes – in addition to defining the scope itself – a framework for stakeholders and discussion on collaboration possibilities. Conclusions for directing the future work are presented, as well as proposals for contacting the stakeholders.