3 Ways Consolidation Will Hit Commerce Media in 2026
Meta: How retailer alliances, disintermediation and data landgrabs will reshape commerce media economics, measurement and creative in 2026.
Retail media was born fragmented: hundreds of retailer networks, thousands of sellers, a sprawl of adtech middlemen in between. In 2026, that chaos starts to compress. Rising capital costs, tougher margins and mounting pressure for clean measurement are forcing both retailers and advertisers to ask whether the current commerce media stack is simply too expensive and too complex to sustain.
Behind closed doors, strategists sketch out two simultaneous moves. Some retailers will band together, pooling data and inventory to gain scale. Others will go the opposite way, stripping out intermediaries and building direct pipes to marketers. For out‑of‑home and omnichannel buyers, those shifts will change how campaigns are planned, priced and measured across screens, including digital OOH.
1. Retail alliances will create “clustered” walled gardens
The first wave of consolidation will not be mega‑mergers between giants like Amazon, Walmart or Tesco. Instead, expect alliances: mid‑tier and specialist retailers clustering into shared media networks to mimic the scale and data richness of the largest players.
These coalitions may take several forms. Some will resemble federated retail media networks, where grocers, pharmacy chains and convenience players pool de‑identified first‑party data into a shared clean room, standardize formats and offer unified buys across web, app, CTV and in‑store screens. Others will be looser sales partnerships, where a lead retailer handles demand while partners contribute inventory and audiences.
For advertisers, the upside is clearer reach and fewer negotiations. Instead of stitching together ten separate retail media deals to hit a category, buyers can tap one cluster and access a broad footprint of inventory, including retail digital OOH and on‑premise screens. Frequency management and attribution should also improve: if alliance members share identifiers and reporting, a single campaign can follow users from online impression to in‑store transaction without as many blind spots.
But these clusters will still behave like walled gardens. Each alliance will have its own measurement rules, its own privacy posture and its own expectations on data sharing. That creates a “few big walls instead of many small ones” problem: easier to manage than today’s long tail, but still challenging for brands trying to compare performance across ecosystems. The trade‑off for buyers is clear: more scale and sophistication inside each alliance, at the cost of cross‑network flexibility and bargaining power.
2. Disintermediation will squeeze the adtech middle layer
At the same time, another set of retailers—and some of the biggest brands that spend with them—are leaning into direct relationships that cut out adtech middlemen. Driven by the need to improve margins and control data, retailers are simplifying their stacks, reducing reliance on multiple SSPs, resellers and managed‑service vendors that sit between their inventory and advertiser demand.
Technically, this means more direct or preferred programmatic connections, fewer hops in the supply chain and heavier use of in‑house or white‑label ad platforms. Commerce media campaigns that once passed through three or four intermediaries before they hit a retail site or in‑store screen could soon travel a much shorter path. In parallel, large advertisers are expanding in‑housing: building their own buying platforms and integrating directly with retail APIs and clean rooms, bypassing some agency‑owned tech.
For commerce media and OOH buyers, that has three big implications. First, fees: fewer intermediaries can mean lower take‑rates overall, but retailers with strong demand may capture more of the economics themselves, hardening CPMs on premium inventory. Second, transparency: cleaner supply paths make it easier to see where budgets go, which partners actually add value and how much is being spent on data versus media. Third, leverage: as retailers streamline partners, the remaining platforms and networks must prove they deliver incremental demand, incremental data or both. Those that cannot will be quietly dropped.
Disintermediation will not kill adtech, but it will force a shake‑out. The winners will be those that can help retailers operationalize their first‑party data at scale, connect it to offsite channels like CTV and programmatic OOH, and plug into advertisers’ measurement stacks with minimal friction.
3. Omnichannel commerce media will push toward unified measurement
The third consolidation vector is less visible but just as important: measurement and attribution. As retail media networks extend into connected TV, digital audio, in‑store digital signage and programmatic out‑of‑home, brands are demanding a single view of how commerce media drives sales across every touchpoint.
Today, that view is fractured. Each RMN often comes with its own dashboard, methodology and definitions of incrementality. OOH and CTV vendors have yet another set of metrics. In 2026, expect a rapid convergence around shared identity frameworks, clean rooms and third‑party verification partners as advertisers insist on comparable, audited results across platforms.
This does not mean a universal ID magically reappears. Instead, retailers and media owners—including OOH networks—will increasingly anchor attribution in their own first‑party datasets (loyalty, app usage, transaction logs) and join those in privacy‑safe environments with advertisers’ CRM data and modeled exposure logs from CTV and DOOH. The platforms that can plug most easily into those environments will gain an outsized role, effectively consolidating much of the measurement power in the hands of a few key players.
For commerce media strategists, the practical shift will be toward fewer, deeper measurement partners and standardized frameworks for experiments, test‑vs‑control and media mix modeling. OOH stands to benefit: when in‑store screens and roadside DOOH placements are consistently tied back to transactions in the same clean room as onsite and in‑app media, their role in driving incremental sales becomes easier to prove—and to defend in budget negotiations.
Taken together, retailer alliances, disintermediation and measurement convergence will reshape commerce media economics in 2026. For advertisers, the job is not to pick one camp, but to decide where scale, control and transparency matter most—and to design omnichannel plans, including OOH, that can flex as the consolidation wave gathers speed.