The Circular Economy (CE) represents a transformative approach to sustainable development, aiming to replace the traditional linear "take-make-waste" model with a regenerative system that minimizes waste through the continual use of resources. This thesis provides an up-to-date examination of the adoption of CE principles within a selection of Swedish companies, exploring how these principles are integrated into their business models and the challenges and opportunities that arise from their implementation. Through a comprehensive analysis, including literature reviews, document analysis, comparative analysis, and thematic analysis, this study provides a detailed insight into the operationalization of CE in Sweden and a hypothetical case study scenario with recommendation on implementing CE practices. Companies such as IKEA and H&M are highlighted for their robust CE practices. The findings suggest a positive trend toward sustainability, driven by a combination of regulatory support and strong corporate commitment to environmental stewardship, although challenges related to operational and regulatory constraints persist. This thesis contributes to the broader discourse on sustainable economic practices by outlining actionable strategies for enhancing CE adoption across industries.