Globally, the commitment of companies to Circular Economy (CE) is still limited. Mapping the circular practices performed by companies is a challenging and complex task and few empirical papers have explored CE implementation in companies. Based on interviews and analysis of company reports, we addressed in-depth the implementation of practices, targets, and assessment tools related to CE in ten Swedish companies. Only 10 circular practices out of 21 are implemented in at least 50% of the companies, indicating that the companies have just begun their transition to CE. The most common practices relate to waste reduction and resource efficiency (mainly energy). Barriers to collaboration are competition, keep confidentiality, small company size, lack of interest of other stakeholders, among others. So, there is a potential for increasing collaboration, especially with the municipality. The priority has been emissions reduction targets and the use of climate-focused tools (i.e., carbon footprint) while social aspects and circularity are less explored. We conclude that the monitoring of environmental performance is limited mainly to the use of resources and emissions. The low use of circularity tools is caused mainly by internal barriers such as lack of knowledge and shortage of resources. So, the companies should get more knowledge on CE assessment tools, include social indicators related to circular practices, and set targets for societal impact. © 2025 The Authors