An electrical connector assembly (100) includes a connector holder (2) defining a plurality of positioning cavities (2101) therein, and at least a slot (2103) located in a front portion of each of the positioning cavities; a plurality of grounding members (5) respectively mounted to the positioning cavities, each of the grounding members (5) having a body portion (50), a first contacting portion (51) connected to a front edge of the body portion, a second contacting portion (52) connected to a back edge of the body portion and at least an arm (53) connected to a lateral edge of the body portion, said at least an arm received in the at least a slot, and the first contacting portion disposed out of the connector holder; a plurality of connectors respectively mounted to the positioning cavities, each of the connectors having a metallic shell contacting the second contacting portion; and a metallic cage (4) enclosing the connector holder and the connectors, with the first contacting portion contacting inner surface of the metallic cage.