The Tokyo-based advertising giant, which announced its acquisition of the global media network last July, had originally expected to complete it in the fourth quarter. The combination of Dentsu and Aegis in China will create the country's third-largest industry company, according to Dentsu. Following the close, Dentsu has unveiled a new London-based entity, Dentsu Aegis Network Ltd., which will oversee the Dentsu agency outside of Japan and Aegis' media operations globally.