World-Leading Media Agencies Partner with Hivestack to Deliver Programmatic Digital Out of Home (DOOH) for Advertisers in Hong Kong Hivestack , the world’s largest, independent, programmatic digital out of home (DOOH) ad tech company has been selected as programmatic digital out of home (DOOH) partner by several leading global advertising and media companies including GroupM , Xaxis , Publicis , Havas and dentsu International Hong Kong . Hong Kong-based advertisers will now be able to capitalise on the benefits of programmatic buying, activating against premium programmatic DOOH inventory through the Hivestack DSP via Open Exchange and Private Marketplace deals. Programmatic...