An EMI shielding device for an optical transceiver is disclosed. The EMI shielding device includes a shell with an optical and electrical interfaces al opposed ends. The shell includes a base and an upper cover. The upper cover includes a plate having at least two flanks, each having a lateral plate that extends downward. The base includes a base plate having at least two flanks, each having a base side baffle. The upper covet plate is located between the base side baffles. The lower ends or surfaces of the upper cover lateral plates have serrations thereon. A conductive gasket under the serrations contacts the base. The conductive gasket and the serrations result in reliable multipoint contact between the upper cover lateral plates and the base, thereby providing reliable electrical continuity between the upper cover and the base, and reducing electromagnetic leakage.