The circular economy is evolving from sustainability rhetoric to measurable business metrics. The Global Circularity Protocol—released in late 2025—provides a framework (Scopes A, B, C) for tracking material flows and quantifying circular economy performance similar to GHG Protocol. Two key strategies are emphasized: "Close the Loop" (waste-to-raw-material cycles) and "Narrow/Slow the Loop" (reducing virgin material use and extending product lifespan). For Thai SMEs, this means operationalizing circular practices into reportable KPIs that matter to shareholders and investors, not just environmental compliance.