A receptacle assembly includes a front housing configured for mating with a header assembly. A plurality of contact modules are coupled to the front housing. Each contact module includes right and left conductive shells. Each conductive shell holds a frame assembly including a plurality of contacts that extend from the conductive shell for electrical termination. A commoning clip is coupled to the plurality of contact modules. The commoning clip has grounding beams extending forward of the right and left conductive shells for electrical connection to header shields of the header assembly. The commoning clip includes a plurality of openings in a rear thereof with barbs along sides of the openings. Each opening receives right and left conductive shells of a corresponding contact module with the barbs engaging the right and left shells to electrically connect the commoning clip to both the right and left shells of each contact module.