Agency Holding Companies Are Dangling AI Sweeteners to Grow Principal Media

Why Holding Companies Are Bundling AI With Principal Media

Agency holding companies are increasingly pitching principal media as part of a broader package that includes data services and, increasingly, artificial intelligence tools. Principal media means the agency buys ad inventory itself and resells it to the client at a markup, rather than acting purely as an agent earning a fee. Consultants who connect marketers with agencies say the bundles are designed to accelerate growth in one of the most profitable parts of the agency business.

According to Cyd Falkson, senior vice president of strategic accounts at consultancy MediaSense, agencies still struggle to price and sell their technology and have not proved its value to clients at scale. One unnamed consultant told Digiday about a holding company offering a marketer 'free AI tokenization' in exchange for signing up for a full package that included principal buying and a data service.

The financial stakes are visible in Omnicom's first-half 2026 earnings: 'third party service costs' nearly doubled to about $2.9 billion from $1.7 billion a year earlier. Omnicom's footnote describes the line as third-party supplier costs when the company acts as principal in providing services to clients. Tom Denford, CEO of consultancy ID Comms, called the broader trend 'a systemic shift' rather than a blip.

Marketers are divided over the practice. Large advertisers often accept it because they believe they still pay less than in the open market, even when the holding company keeps an undisclosed margin. Critics, including many independent agencies, argue that an agency stops being an agent when it is both buyer and seller. Consultants say the largest principal practitioners are reluctant to discuss the economics publicly.

What Omnicom's Cost Surge and the Transparency Debate Reveal

The bundling of AI services with principal media is less a technology story than a commercial one. The reported actions point to several dynamics.

Why AI has become the hook

Agencies have rushed to assemble AI tools but have not found a reliable way to charge for them. Falkson's point about pricing and selling technology explains why those tools end up as sweeteners: a holding company can monetize an AI investment indirectly through the high margins of principal media, while locking in a long-term data contract at the same time.

What Omnicom's cost surge suggests

The jump in Omnicom's third-party service costs - from $1.7 billion to almost $2.9 billion in a year - is the clearest public sign of how much principal activity is growing. Not every dollar in that line is necessarily principal media, but the footnote tied to the number indicates the model is becoming a structural part of holdco revenue rather than a niche sideline.

The Publicis factor and the transparency gap

Analysts and consultants identify Publicis as the largest and most successful principal practitioner, even as CEO Arthur Sadoun has played down the practice. That gap between public positioning and market perception reinforces the criticism that the economics of principal deals are opaque. Independent agencies say they lose pitches when a holdco appears to give media away almost free in exchange for a principal commitment and a data contract.

Who gains and who loses

In the near term, holding companies gain: principal media supports margin growth in an era of procurement pressure and gives holdcos a vehicle for seeding AI and data products. Large marketers that can verify savings may also benefit. The likely losers are smaller marketers and independent agencies. One unnamed consultant said some CFOs and sourcing teams are not equipped to work out whether they are being overcharged, and Falkson advises clients to state their position explicitly in reviews because agencies will otherwise assume principal participation is part of the commercial model.

Earnings support the direction of travel

Omnicom's first-half revenue rose 66% - a number inflated by the inclusion of IPG, which was not in the 2025 base - with margins at 15.5% and organic growth of about 6%. Stagwell reported 10% revenue growth and 8% organic growth, led by its digital transformation unit at 12%, which CEO Mark Penn tied to marketer demand for AI. WPP releases its first-half numbers on Aug. 6 and Dentsu on Aug. 14, which will give a fuller read on how the model is affecting the sector.

What Marketers Should Demand Before Signing a Principal Media Deal

For marketers and procurement teams, the reported bundling of AI services with principal media changes how an agency review should be handled. The steps below follow directly from the practices described in the briefing.

• Put the company's position on principal media in writing before a review starts: Falkson says clients who do not do this risk agencies assuming participation is part of the commercial model.
• Ask the holding company to disclose the principal markup and compare the net cost with open-market benchmarks; consultants warn that some CFOs and sourcing teams are not equipped to spot unfavorable terms.
• Treat 'free' AI tokenization as a priced component: find out what commitment it is tied to, such as principal volume or a multiyear data contract, before signing.
• Require independent validation of claimed savings; the source article notes that some marketers accept savings claims even when the holding company is earning more from them.
• Weigh scale benefits against opacity if the company is a smaller advertiser: independent agencies say they cannot match holdco scale, so leverage in negotiations may be limited.