The most The global market is undergoing rapid and continuous changes, making the adoption of circular business models a crucial strategy for the survival and growth of supply chain participants. Although the transition to a circular business approach is a complex and demanding process, it is essential for companies facing limited natural resources and escalating environmental challenges such as air, water, and land pollution. Balancing economic, environmental, and social goals has become the key objective for businesses. Industry 4.0 plays a significant role in redesigning and implementing circular business models, particularly through the application of digital technologies. For this study, research was conducted in the Republic of Serbia to assess the impact of digital technologies on business performance and the integration of participants within the circular supply chain. The findings indicate that the most commonly used Industry 4.0 technologies in these supply chains are the Internet of Things (IoT) and Big Data. Respondents noted that digital technologies have the greatest impact on faster response to consumer demands, demand forecasting, and the integration of participants within the supply chain.