Plum has recently undertaken a detailed review of Multi-Operator Core Network (MOCN) technology, with assessment on commercial and economic efficiencies and regulatory policies. MOCN brings incremental benefits over Multi-Operator Radio Access Network (MORAN) technology in that, additionally, MOCN enables spectrum sharing. With ongoing traffic demands towards 4.5/5G, we believe that MOCN technology and spectrum sharing are important enablers that must be considered by regulators. Our report looks into capabilities feasible with current generally available products, regulatory stances in selected jurisdictions and key commercial and economic benefits.