Google, Meta, ByteDance, and Amazon capture 75% of global ad growth

The concentration of ad revenue into four full-funnel platforms signifies a structural shift toward measurable, down-funnel performance. For the streaming industry, this means ad-supported tiers are no longer just an alternative, but the primary growth driver for subscriber acquisition and retention. As AI reduces the cost of content production, a supply glut may commoditize mid-tier inventory that lacks high-trust attribution. Watch for the emergence of "agentic advertising," where AI agents manage discovery and purchases, potentially shifting value away from current search and retail media aggregators. The next indicator of this trend will be the 2026 upfronts, where streaming platforms must prove higher ROAS to compete with automated, full-stack tech ecosystems.

The global advertising market hit a historic milestone in 2024, surpassing $1 trillion in total revenue for the first time, per WPP Media (formerly GroupM) in December 2024. Despite this macro strength, growth is diverging sharply between tech giants and legacy players. While total global ad revenue is projected to grow 8.8% in 2025, digital pure-play platforms are expected to account for over 73% of that total. Retail media has emerged as a particularly dominant force, with projections from WPP suggesting it will reach $177 billion globally in 2025, surpassing total TV revenue—including streaming—for the first time. This platform dominance is triggering significant consolidation among traditional service providers. In late 2025, Omnicom moved to acquire Interpublic Group (IPG) in an all-stock deal valued at approximately $13.3 billion, a maneuver intended to provide the scale necessary to compete with the automated ad-tech stacks of Amazon and Google. Meanwhile, the "consultancy" model is rising; Accenture Song surpassed WPP in 2025 to become the world’s largest agency by revenue, per Ad Age. These shifts reflect a broader industry mandate: agencies must pivot from creative-led services to technology-integrated platforms as brands increasingly demand data-driven, full-funnel solutions over traditional brand awareness campaigns.