A receptacle assembly includes a contact module having a conductive holder has a first side and an opposite second side. The conductive holder has a chamber between the first and second sides. A frame assembly is received in the chamber of the conductive holder. The frame assembly includes a plurality of contacts and a dielectric frame supporting the contacts. The contacts extend from the conductive holder for electrical termination. A ground lead frame is received in the chamber between the frame assembly and the conductive holder. The ground leadframe has grounding members that extend from the conductive holder for electrical termination to header shields of the header assembly.