Retail Media Is Exploding. Most Retailers Are Not Ready for the Data Test

Introduction

Retail media looks like an advertising opportunity.

That is only half true.

Yes, brands are moving serious money into retail media networks. EMARKETER expects US retail media ad spend to reach $69.33 billion in 2026, up from $58.79 billion in 2025.

But the retailers that win this market will not win because they placed more ads on a website.

They will win because their commerce data is clean enough to prove what happened after the ad.

That is the part many retailers are not ready for.

Retail media is really a data business

The pitch is simple.

A retailer knows what shoppers browse, buy, return, reorder, and ignore. That makes the retailer’s first-party data valuable to brands that want to reach real buyers, not guessed audiences.

But first-party data is only powerful if it is usable.

If customer identity is split across ecommerce, stores, loyalty, marketplace, mobile app, and customer service, the signal is weak. If product data is inconsistent, audiences get messy. If inventory data is late, campaigns promote products that cannot be fulfilled. If sales data is incomplete, measurement becomes guesswork.

Retail media does not forgive disconnected systems.

It exposes them.

Why the big players are pulling away

The market is growing, but the growth is not evenly spread. In the same forecast, EMARKETER says Amazon and Walmart will capture more than 89% of the incremental retail media dollars in 2026.

That should be a wake-up call for every other retailer.

Smaller and mid-market retail media networks cannot compete only on scale. They need to compete on trust, clean measurement, strong category knowledge, and high-quality commerce signals.

That means the data foundation matters more than the media deck.

A brand does not only want impressions.

It wants to know which shoppers saw the ad.

Which products moved?

Which stores saw lift?

Which segments responded?

Which purchases were incremental?

Which campaign should get more budget next month?

That is a closed-loop measurement, and it depends on connected retail systems.

The measurement problem is getting louder

IAB has been clear that retail media now gives advertisers access to deterministic purchase data and closed-loop feedback. That is the good news.

The hard part is that many measurement models were built for a world where the sale was harder to see.

IAB’s retail media measurement article makes the point directly: retail media can provide closed-loop, SKU-level, transaction-level measurement. If retailers cannot connect media exposure to real commerce outcomes, they give up the strongest proof retail media has.

That is how retail media loses credibility.

The ad team sells the promise.

The data team chases the truth.

The brand gets a report that feels incomplete.

What retailers need before they scale retail media

Retailers do not need to build a massive media network overnight.

They need to get the data basics right first.

• Can we identify the same customer across store, app, web, and loyalty in a privacy-safe way?
• Can we connect ad exposure to real transactions?
• Can we measure by SKU, category, store, region, and channel?
• Can we avoid promoting products that are out of stock or unavailable in key markets?
• Can brands trust our reporting enough to reinvest?

If the answer is no, the retail media network is not ready to scale. It may still sell ads, but it will struggle to sell confidence.

That is why retail media has to be treated as connected commerce, not a media side project.

The cleanest ad product will still break if product, customer, loyalty, inventory, store, and transaction data do not agree.

The bottom line

Retail media is growing fast.

But growth alone will not make every retailer a media winner.

The winners will be the retailers that can prove the sale, protect the customer signal, keep product data clean, and connect media activity back to real commerce outcomes.

Retail media is not just about selling ad space.

It is about turning retail data into something brands can trust.

Want to see how SkillNet helps retailers connect commerce, data, and store operations behind retail media? Learn more about SkillNet’s Digital Engagement, Data and Analytics, and StoreHub work.