S11.7 · Media, Entertainment & Creative
A ~$1.1T global ad-spend market where the agency fee pool is compressed by in-housing and AI-driven creative and campaign automation.
Global advertising spend is roughly $1.08-1.14T in 2025 (WPP Media/GroupM). The agency fee pool sitting on top of that spend — the revenue agencies actually capture — is far smaller, in the tens of billions across the major holding companies, and the gap between the two is the segment's central fact. Ad spend is growing at a high-single-digit rate on the back of retail media and connected TV; agency holding-company organic growth is running well behind it as marketers increasingly bring capabilities in-house. The market is fine. The intermediary's take rate is the problem.
The US represents roughly 45% of global ad spend, with China and the rest of APAC the second-largest and fastest-growing digital ad market. WPP, Omnicom/IPG, Publicis and Dentsu dominate network revenue, above a fragmented long tail of boutique agencies and in-house teams. Advertisers sit upstream; agencies handle creative, planning and buying in the middle; and downstream, the platforms — Google, Meta, Amazon and connected-TV inventory — capture the largest and fastest-growing share of the ad-spend dollar.
Agency economics are pure services: labor-based retainer or project fees, no rights ownership of any kind, and margins under structural compression as spend disintermediates toward platforms directly. That is the core distinction between agencies and the rest of this sector. There is no annuity asset anywhere in the business to offset margin pressure, so holding-company organic growth is almost entirely a function of net new client wins and scope expansion within existing accounts. Nothing in the model compounds on its own.
Of the three extension moves — production, martech/data services and retail media — the first two are defensive responses to margin compression. Retail media is the genuine expansionary bet: a growing budget category that sits closer to the point of sale than traditional brand advertising.
Generative AI is collapsing creative-production and campaign-optimization labor cost, and that labor is not a peripheral cost line — it is the core agency fee base itself. As brands generate creative assets themselves and buy media programmatically in-house, the fundamental reason to route spend through an agency weakens. Beneath the holding companies, a distinct lower-cost competitive tier is forming around AI-native performance-marketing shops — small teams paired with AI tooling doing work that previously required much larger agency teams to execute. This compression is not an emerging risk; it is underway now, and it runs on roughly the same timeline as the in-housing trend that has been pressuring agency organic growth for several years.