SMG names Omnicom Media as the agency beta partner for its retail media exchange platform RMX to streamline cross-network advertising
The retail media landscape, currently experiencing a period of explosive growth, has taken a significant step toward maturity as connected commerce specialist SMG announced that Omnicom Media (OM) will serve as the exclusive agency beta partner for its new Retail Media Exchange (RMX) platform. This strategic collaboration aims to dismantle the silos that have historically hampered the retail media sector, providing a centralized ecosystem for agencies and brands to plan, activate, and measure campaigns across a fragmented marketplace.
As global advertising budgets increasingly pivot toward retail environments—where high-intent shopper data meets digital and physical touchpoints—the complexity of managing disparate retail media networks (RMNs) has become a primary pain point for major media agencies. By integrating OM’s workflows with SMG’s RMX technology, the partnership seeks to transform the manual, often disjointed process of inventory discovery and campaign reporting into a streamlined, automated experience.
The Evolution of the Retail Media Exchange
The inception of RMX is rooted in SMG’s broader "Plan-Apps" suite, a technological framework designed to bring cohesion to the chaotic retail media buying process. While the platform’s initial rollout focuses specifically on digital in-store screen inventory across the United Kingdom, the long-term roadmap for RMX is far more ambitious. SMG intends for the platform to eventually serve as a comprehensive, omnichannel engine capable of managing diverse media formats, from sponsored search and display ads to off-site programmatic retail media.
The launch of this beta program arrives at a critical juncture. Currently, the retail media market is often described as the "third wave" of digital advertising, following search and social. However, unlike search and social, which operate on highly standardized, centralized platforms, retail media is decentralized. Every major retailer—from grocery giants to specialty electronics stores—has developed its own proprietary media network. Each network brings its own unique set of planning processes, creative specs, and, most crucially, non-standardized reporting metrics. This creates a high barrier to entry for agencies attempting to scale campaigns across multiple retailers simultaneously.
Strategic Objectives and the Beta Framework
The partnership with Omnicom Media is structured as an iterative feedback loop. During the initial phase, OM teams will utilize RMX for live client briefs and active campaigns. This "in-the-wild" testing is intended to provide SMG with granular, real-world data regarding the platform’s user interface, workflow efficiency, and integration capabilities.
A key component of this collaboration is the integration workstream with Omnicom’s proprietary Omni Intelligence Platform. By syncing RMX with Omni, the agencies aim to embed retail media data directly into the tools already used by their planners and buyers. This reduces the "swivel-chair" effect, where practitioners must toggle between multiple software suites to execute a single omnichannel campaign. For OM, the goal is to drive operational efficiency and provide clients with a clearer view of how retail media spend contributes to overall business performance.
SMG has committed to providing intensive training and ongoing technical support to the participating Omnicom teams, ensuring that the platform’s development remains tethered to the actual requirements of media buyers rather than purely theoretical design.
Market Context: The Scaling Challenge
To understand the necessity of RMX, one must consider the sheer volume of capital flooding into the retail media space. According to recent industry projections from organizations such as eMarketer and WARC, global retail media ad spending is expected to exceed $150 billion by 2026. This rapid acceleration has outpaced the development of the infrastructure needed to support it.
Historically, agencies have managed this growth by building bespoke teams and manual workarounds. Retailers, meanwhile, have guarded their data and inventory closely, often prioritizing their own proprietary portals. However, as advertisers demand better attribution and cross-retailer reach, the industry has recognized that fragmentation is a ceiling on growth. If a brand cannot easily compare the performance of a digital screen campaign at Tesco with a sponsored search campaign at Amazon or an off-site ad at a fashion retailer, they are less likely to increase their total retail media allocation.
SMG’s approach—retaining retail control while enabling agency connectivity—addresses the tension between the retailer’s desire for ownership and the agency’s need for efficiency. By standardizing the "pipes" through which inventory is booked and reported, RMX creates a cleaner path for media investment.
Official Perspectives on the Partnership
The announcement has been framed by both parties as a milestone in the "connected commerce" era. Ollie Shayer, senior director of global strategy and innovation at SMG, emphasized that the collaboration is not merely about software development but about fostering a more sustainable retail media ecosystem.
"We’re delighted to be working with Omnicom Media as we begin this first phase for RMX," Shayer stated. "Their agency investment and client perspective will help ensure the platform develops around real market needs, from our initial focus on digital screens to omnichannel planning, more consistent measurement, and closer connection with the tools agency teams already use."
From the agency side, the move signals a commitment to mastering the complexities of retail media. Omnicom Media, which has been aggressively investing in its retail media capabilities, views this partnership as a mechanism to offer clients a competitive advantage. By participating in the beta, OM is effectively helping to define the standards that will govern the platform, positioning itself at the forefront of the inevitable industry shift toward programmatic, automated retail media buying.
Broader Implications for the Industry
The implications of the SMG-Omnicom partnership extend beyond the immediate benefits for the two companies involved. This initiative is part of a larger trend toward the professionalization of the retail media supply chain. Several industry observers have noted that as the "low-hanging fruit" of retail media—sponsored search on high-traffic retail sites—becomes saturated, brands are looking toward more complex formats, such as digital-out-of-home (DOOH) screens in physical stores and CTV (Connected TV) integration.
Managing these formats requires a degree of technical sophistication that manual spreadsheets cannot provide. The development of exchanges like RMX suggests that the industry is moving toward a model similar to programmatic advertising, where inventory is traded on a more transparent, data-driven basis.
However, challenges remain. The primary hurdle for any exchange platform is achieving scale. For RMX to become a market standard, it must demonstrate that it can attract a broad spectrum of retailers. If the platform becomes too exclusive, it risks creating another "walled garden." SMG’s stated philosophy of allowing retailers to retain control over their pricing, inventory, and commercial relationships is a deliberate attempt to mitigate this risk. By keeping the retailer in the driver’s seat while providing a standardized interface for agencies, SMG hopes to balance the needs of both sides of the marketplace.
Conclusion and Future Outlook
The launch of the RMX beta program marks a significant inflection point in the narrative of retail media. As the sector shifts from a novelty-driven investment to a core pillar of the digital media mix, the demand for better infrastructure will only intensify. The collaboration between SMG and Omnicom Media provides a blueprint for how agencies and retail media providers can work together to solve the industry’s most pressing pain points: complexity, fragmentation, and measurement inconsistency.
As the beta program progresses, the industry will be watching closely to see if the platform can deliver on its promise of omnichannel connectivity. If successful, RMX could serve as the template for future retail media exchanges, accelerating the shift toward a more efficient, measurable, and highly automated advertising landscape. The success of this pilot will likely determine the pace at which other major agencies and retailers seek to standardize their own media operations, signaling a broader movement toward a more integrated retail media ecosystem.
