Commerce media is growing up, which means it is slowing down
Retail media passes $200 billion globally in 2026. The interesting number is not the total; it is what the growth rate does once you take Amazon out of it.
iStudios, Media practice
WARC Media's Future of Commerce Media 2026 forecasts global retail media investment of $200.4bn in 2026, rising to $223.4bn in 2027, an 11.5% year-on-year increase that takes the channel to 15.2% of all worldwide ad spend. One pound in seven, spent inside somebody else's shop.
The line underneath the headline is the one worth reading twice. Strip Amazon out and 2027 growth falls to 9.8%, the slowest rate since WARC began tracking the channel. The category is still expanding faster than the market, but the era where any retail network could raise rates and expect budget to follow is closing.
What a maturing channel actually feels like
Three things change when a channel stops growing at thirty percent. Buyers start comparing networks against each other instead of against last year. Incrementality questions get asked out loud, because sponsored search on a retailer's own site has always had an awkward relationship with the word 'incremental'. And the long tail of small networks struggles, because the operational cost of a separate login, a separate taxonomy and a separate reporting format is only worth paying at scale.
A retail network that cannot answer the incrementality question is competing on inventory. That is a race it loses to whoever has more of it.
The practical position
- Treat on-site sponsored search as partly a defensive tax and budget for it honestly, rather than reporting its ROAS alongside prospecting and pretending they are the same instrument.
- Push every network for a clean holdout or a geo test. The ones that can run it are telling you something; the ones that will not are telling you something too.
- Consolidate. Two networks measured properly beat seven measured by whatever each one's dashboard reports about itself.
- Use off-site retail inventory, which is the retailer's data on other people's media, as the actual growth lever. That is where the audience is genuinely new.
None of this is an argument against commerce media. It is an argument for buying it like a mature channel rather than a land grab, roughly two years before most of the market gets there.