Why Accenture and Omnicom just handed Adobe their AI playbook

Adobe (ADBE) unveiled new AI partnerships with Accenture (ACN) and Omnicom (OMC) at Cannes Lions this week. On the surface, it reads as a routine expansion of Adobe’s agency ecosystem.

If you look at the timing and details of these deals, it is clear that two of the biggest names in advertising decided it was better to buy into existing AI tech rather than build it themselves.

Adobe said Accenture Song co-developed a new agentic orchestration framework built on Adobe’s technology, while Omnicom unveiled implementation architectures for its AI Agentic Operating Model across automotive, pharmaceuticals, retail, and financial services, according to the official Adobe newsletter.

Both partnerships extend deals the companies struck earlier this year. Neither company started from zero, but neither is doing it alone.

Omnicom just finished the biggest merger in agency history

Omnicom completed its $13.5 billion acquisition of Interpublic Group on Nov. 26, 2025, forming the world’s largest advertising holding company, according to Omnicom’s regulatory filings with the SEC.

The deal merged two massive agency networks, each running its own data systems, creative workflows and AI tools. Combining them into one operating structure was always going to be the harder problem than closing the deal itself.

Rather than build that unified AI layer entirely in-house, Omnicom expanded its Adobe partnership, integrating its own Omni platform with Adobe’s enterprise stack to create the agentic Operating Model, according to Omnicom’s announcement.

The company keeps its proprietary data and client relationship inside Omni.

It hands the governance, content infrastructure, and orchestration logic to Adobe instead of building a competing version twice, once for legacy Omnicom and once for the newly absorbed IPG networks.

Omnicom completed its $13.5 billion IPG merger in November 2025, then expanded its Adobe partnership instead of building a unified AI infrastructure in-house.

Stuart C&period; Wilson / Getty Images

Adobe already owns the infrastructure agencies don’t want to rebuild

Adobe says more than 20,000 companies already run its platform, giving it years of accumulated content, data, and governance tooling that newer AI systems cannot easily replicate, according to the company.

Adobe also told investors more than 80% of its major customers now use its integrated agentic features, a sign the dependency is already widespread, not theoretical.

Brand safety is far harder to retrofit into an AI system than to build in from the start, which is why agencies keep choosing the platform with the longest track record over building their own.

Adobe’s pitch to agencies is that “agentic AI is no longer something brands experiment with, but what they run on,” said Customer Experience Orchestration Chief Marketing Officer Rachel Thornton.

The same calculus applies to Accenture. Adobe counts nine other systems integrator, including Capgemini, Deloitte Digital, and PwC, building agentic offerings on its stack rather than competing platforms.

Standardizing on one vendor cuts both ways

The pattern is not unique to Omnicom and Accenture. Agencies still run their own proprietary systems, including Omnicom’s Omni Publicis’s Marcel and WPP Open, but they are increasingly layering Adobe’s governance and content infrastructure on top of those systems instead of building competing versions, a Digiday analysis of the agency AI landscape indicated.

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That concentration gives Adobe leverage over how the industry’s AI workflows actually function, not just which logo appears on the press release.

Despite that growing role, Adobe shares fell after the Monday, June 22, announcement, extending a stretch in which the stock has traded near its 52-week low, according to data from TipRanks.

The market is not yet pricing this infrastructure position the way the partnership language suggests it should.

The contest in advertising AI is about who controls the plumbing

Omnicom’s logic is coherent. Rather than rebuild AI infrastructure twice, once for itself and once for the IPG networks it just absorbed, the company bought into a platform that already serves its competitors.

Accenture’s logic runs parallel. Selling consulting services on top of Adobe’s stack scales faster than building a proprietary one and competing with the vendor at the same time.

Wall Street has not fully rewarded that logic yet. Adobe’s stock slipped this week, even as the company locked in more of the industry’s AI workflows. This suggests investors are pricing the risk of customer concentration as much as the upside of becoming indispensable.

The bigger story extends past advertising. As professional services firms in consulting, finance, and health care adopt agentic AI, the real competition is shifting from who builds the best AI to who controls the infrastructure on which everyone else has to run it.