Faced with growing environmental pressures and sustainability requirements, companies are adopting responsible green supply chain practices such as eco-design, reverse logistics, and green purchasing. This study aims to measure the impact of these practices on supply chain performance, as well as on the company's financial and environmental performance. To answer the question: “How do green supply chain (GSC) practices affect supply chain performance (SCP), along with a company's financial and environmental performance?”, we adopted a two-phase explanatory sequential methodology. First, we conducted a quantitative study using structural equation modeling (SEM). Data were collected via a questionnaire distributed to Moroccan companies at the Logismed trade fair and processed using IBM SPSS AMOS 26 software. We then enriched the initial findings with a case study of Equatorial Coca-Cola Bottling. Semi-structured interviews with logistics managers confirm that green sourcing, eco-design, and reverse logistics initiatives have a positive impact on supply chain performance (SCP), with significant financial and environmental benefits.