The formation of Horizon Global comes at a "dynamic moment" for the ad industry, according to Bob Lord, interim CEO of the new joint venture. Agencies are contending not only with the rise of technology like generative AI, but also increased category consolidation that is lending competitors even greater scale. Omnicom Group and Interpublic Group, for example, are on the path to forming the world's largest ad-holding group after agreeing to a finalized consent order from the Federal Trade Commission on Friday.