FIRST, identify who owns or makes this. The leading public parent is WPP plc (LSE: WPP), the global advertising holding company that owns major agency networks coordinating brand partnerships. Direct exposure also comes via Omnicom Group (NYSE: OMC) and Interpublic Group (NYSE: IPG), with Publicis Groupe (Euronext Paris: PUB) and Dentsu (TSE: 4324) providing additional regional access. Indirect plays include software and platforms that enable co-branding, influencer marketplaces, and data-driven partnership analytics, as well as marketing-tech ecosystems and consumer brand-focused investment funds.