ESFRI Landmarks were introduced in the ESFRI Roadmap 2016 as reference Research Infrastructures (RIs) and are pillars in the ERA landscape, offering not only services to academic research but also supporting development and innovation. In order to support the further development of the Landmarks and to achieve further insights into the functioning of the European RI ecosystem, the Forum has assigned the Monitoring Committee (MC) with the task of conducting a monitoring of all operational ESFRI Landmarks. The Monitoring should further enable regular exchange between ESFRI and Landmarks on their longterm development, assess the quality of each individual Landmark, identify possible problems and support the Landmarks to take appropriate actions. It shall also provide information on the performance, outputs and impacts of the Landmarks. The Monitoring started with a Kick-Off Workshop on 16th September 2022 in Brussels, involving interested stakeholders. This report summarises the results of the Monitoring of the first 12 Landmarks. The main generic findings are described in chapter two, while the first experiences with the Monitoring are described in chapter three. It shows that the concept worked well in general, and no major changes need to be implemented for the next batches. Some of the main practical issues were solved in the course of the process. However, the early availability of information for Panels, Landmarks and external experts needs to be addressed. Also, ESFRI needs to consider the workload on the Working Groups and Panels, especially considering that other important activities involving these groups, such as the or the ESFRI roadmap process, might run simultaneously.