Retail media network revenue: what Amazon, Walmart, Instacart and Target disclose, and where "0.5% of GMV" comes from

We paired every advertising figure with a sales figure for the same period, then divided. Where a company gives only a growth rate or a run rate, we say so and do not compute a ratio.

How to read the ratios. The denominators are not the same thing. Amazon's net sales include AWS and the fees Amazon charges sellers, not the full value of goods those sellers ship. Walmart's revenue is mostly its own merchandise sales, and Walmart books advertising "either in net sales or as a reduction to cost of sales" depending on the deal (Walmart, 19 February 2026). Instacart's GTV includes taxes, tips and customer fees (PPC Land, 29 October 2026). So the table compares disclosures, not identical metrics.

Scale is uneven. Amazon's trailing twelve-month ad revenue reached $78.0 billion after the third quarter of 2026 (PPC Land, 29 October 2026). WARC forecasts the whole global retail media market at $200.4 billion in 2026 (The Desk on WARC, August 2026). Forecasts by other firms are compared in retail media market size and share.

The pattern traces to Osmos, which sells retail media software. Its page compares Osmos with CitrusAd, now part of Epsilon. It says programmes on that rival stop at 0.5% to 1% of GMV while its own reach 3% to 6% (Osmos, undated, accessed 9 November 2026). The same page puts the cause down to channel mix: "Onsite-only plateaus at 0.5–1% of GMV." These are claims in a sales page aimed at a competitor's customers. We found no audited study behind them.

Osmos also says its customers average 6.75% of GMV, a figure it presents without an audit (Osmos, 12 October 2026; company claim). Moloco, another vendor, publishes a slower curve. Its retailers reached 1% of GMV within a year, 2% within two and, for the strongest, over 3% within three, based on internal data to 31 March 2026 (Moloco, accessed 9 November 2026; company claim).

The disclosed ratios sit on both sides of the vendor band, using the figures in the table above. Walmart's 0.9% and Target's 0.7% fall inside it. Instacart's 3.1% sits above it, and Amazon's 9.7% is far beyond it. Walmart and Target divide by total store and online sales, while vendor figures usually divide by the GMV that runs through the retailer's channels, so treat any comparison as rough.

Onsite revenue is a product of four numbers: searches and page views, ad slots per page, clicks per slot and price per click. A retailer controls only one of these freely, the number of slots. Adding slots past a point hurts the shopper and lowers click rates. Traffic belongs to the core business, not the media team. So once sponsored products sell out on busy pages, growth has to come from new inventory or new buyers.

New inventory means offsite media and in-store screens. New buyers means brand budgets, not only trade budgets, and non-endemic advertisers that do not sell in the store. That is the logic behind the vendor claim, and it holds without the vendor's numbers.

Worked example. Take a grocer with $5 billion in annual sales. At 0.5%, ad revenue is $5,000 million × 0.005 = $25 million. At Walmart's disclosed ratio of 0.9%, it is $45 million. At Instacart's 3.1%, it would be $155 million, but Instacart is an online marketplace with no stores to run, so that ratio is a ceiling for comparison, not a target. Run your own traffic, slots and prices through the retail media economics calculator to see where your onsite ceiling sits.

Offsite. Walmart now lets advertisers use its shopper data in three outside platforms besides its own DSP (PPC Land, 11 June 2026). Kroger and Albertsons did the same with Google in March and April 2026 (PPC Land, 24 March 2026; PPC Land, 28 April 2026). Offsite is where brand budgets live, which is why the vendor "three channels" claim points there. The data flows behind it are explained in offsite retail media explained.

Self-serve. A managed-only network sells to the brands its team can call. A self-serve console sells to everyone else. Tesco's new Ad Manager starts with sponsored products and will add display and video (Grocery Trader, 9 October 2026). The platforms that power such consoles are compared in retail media network platforms compared.

Measurement. Buyers want proof of new sales, not just a ratio. In IAB Europe's 2026 survey, 63% of buyers asked for new-to-brand measurement and only 12% called their own strategy fully sophisticated (PPC Land, 6 November 2026). In the US, the ANA's August 2026 report asked networks for third-party validation and a common 14-day lookback window (Digiday, 18 August 2026). The standards themselves are summarised in retail media measurement standards explained, and the incrementality entry defines the core term.

Supplier relationships. Buyers spread spend wide: 63% work with four or more networks, and 71% have partnered with retailers for more than a year (PPC Land on IAB Europe, 6 November 2026). The networks that win the renewal are the ones that sit inside the supplier's annual plan. Instacart's merger agreement even lists its top ten advertisers in a confidential schedule (PPC Land, 29 October 2026), a sign of how much those relationships are worth to a buyer of the business.

DoorDash agreed on 29 October 2026 to acquire Instacart for about $17 billion in equity value (Instacart, 29 October 2026). Instacart also runs the sites and ad tools behind more than 310 grocery ecommerce sites (PPC Land, 29 October 2026). If the deal closes, the largest public grocery ad line will sit inside a delivery company that does not report advertising separately (PPC Land, 29 October 2026). Benchmarks built on Instacart's ratio may then lose their source. What platform mergers mean for smaller retailers is the subject of retail media consolidation.

1. Pick one denominator and keep it. Use total sales if you report to a board, and GMV through owned channels if you compare with vendor figures. Label it every time.
2. Split revenue by channel. Report onsite, offsite and in-store separately, so you can see whether the onsite line has flattened.
3. Separate gross from net. Offsite revenue often includes media bought on other platforms. Count what you keep, and state your take rate on each channel.
4. Compare with disclosures first. Use the table above, then treat vendor ratios as claims.
5. Track what buyers ask for. Add new-to-brand share and incremental sales to the revenue report. The five KPIs of a retail media network cover the operating side.

If the numbers show a network will not clear its costs, the case against launching is set out in when not to build a retail media network.

1. PPC Land, "Amazon ad revenue growth drops to 11% after Prime Day moves to June" (29 October 2026). https://ppc.land/amazon-ad-revenue-growth-drops-to-11-after-prime-day-moves-to-june/
2. PPC Land, "Amazon advertising gains 26% to $19.8 billion as sports inventory sells out" (31 July 2026). https://ppc.land/amazon-advertising-gains-26-to-19-8-billion-as-sports-inventory-sells-out/
3. Marketplace Pulse, "Amazon Advertising Services Sales" (accessed 9 November 2026). https://www.marketplacepulse.com/stats/amazon-advertising-services-sales
4. Marketplace Pulse, "Amazon Net Sales" (accessed 9 November 2026). https://www.marketplacepulse.com/stats/amazon-net-sales
5. Marketplace Pulse, "Amazon North America Sales" and "Amazon International Sales" (accessed 9 November 2026). https://www.marketplacepulse.com/stats/amazon-north-america-sales and https://www.marketplacepulse.com/stats/amazon-international-sales
6. Walmart, Q4 and fiscal year 2026 earnings release (19 February 2026). https://stock.walmart.com/sec-filings/all-sec-filings/content/0000104169-26-000032/earningsreleasefy26q4.htm
7. Walmart, "Walmart Releases Q2 FY27 Earnings" (20 August 2026). https://corporate.walmart.com/news/2026/08/20/walmart-releases-q2-fy27-earnings
8. PPC Land, "Walmart ad business gains 38% as Walmart Connect hits 43% in Q2" (20 August 2026). https://ppc.land/walmart-ad-business-gains-38-as-walmart-connect-hits-43-in-q2/
9. Instacart, "Instacart Announces First Quarter 2026 Financial Results" (6 May 2026), via Seeking Alpha. https://seekingalpha.com/pr/20502657
10. PPC Land, "Instacart ad revenue gains 23% to $331m in quarter before DoorDash deal" (29 October 2026). https://ppc.land/instacart-ad-revenue-gains-23-to-331m-in-quarter-before-doordash-deal/