VIOOH, a supply-side platform for digital out-of-home advertising, has secured a second programmatic media owner partnership in mainland China.  The London firm, second on our MarTech 50 ranking this year, has launched real-time trading across local programmatic DOOH (prDOOH) inventory in partnership with Beijing Top Result Metro Advertising Co., Ltd.  VIOOH now offers prDOOH across … Continue reading VIOOH signs deal with Beijing Metro