Google has had a diversity rule in traditional search for years: for most non-branded queries, it tries to limit how many results from the same domain appear on the first page. The goal was simple. Stop any one website from monopolizing results and ensure searchers see a range of options.
As organic shopping carousels take up more of the first page, the obvious question is whether that same diversity principle applies to product listings.
We analyzed over 1 million product listings across more than 50,000 search results pages for US-based queries, spanning dozens of product categories. What we found tells a story about how Google's diversity algorithm works, and how some sellers - Walmart in particular - appear to sidestep it through a clever structural advantage.
Key findings at a glance:
- Google's diversity algorithm is broadly working: 54% of carousels show no more than 2 products from any single seller
- The products-per-seller ratio in shopping carousels has held remarkably stable, between 1.36 and 1.5 over Q1 2026
- Walmart operates over 1,600 distinct seller names in Google Shopping, more than any other retailer by a significant margin
- When all Walmart-affiliated sellers are treated as a single entity, the share of carousels with perfect seller diversity drops by 33% on Walmart-containing SERPs
- No other major marketplace platform shows this pattern at comparable scale
Why diversity in shopping results matters more than ever
Google's organic shopping results have become impossible to ignore. Product carousels now appear across an expanding range of queries, from specific product searches to broader informational queries with commercial intent. Unlike traditional blue links, these results are powered less by Google's standard ranking algorithm and more by the Shopping Graph, Merchant Center data, and product feeds.
This shift makes diversity more critical, not less. When shoppers see a product carousel, the implicit promise is that they're comparing options from different retailers: different prices, shipping speeds, return policies, and experiences. If multiple carousel slots are quietly controlled by a single retailer, that promise breaks down.
Yet diversity in Shopping operates in a fundamentally different environment than web search. Instead of ranking individual pages, Google must balance product relevance, price competitiveness, seller reputation, and source diversity, all at once, at scale.
How diverse are Google's organic shopping results?
The data shows that Google's diversity algorithm is doing meaningful work, but perfect diversity is rare.
Looking at individual product carousels:
- 13.9% of carousels display products from entirely unique sellers (every slot = a different retailer)
- 39.8% show a maximum of 2 products from any single seller
- 24.7% show a maximum of 3 products from a single seller
- 12.4% show a maximum of 4 products from one seller
- 9.2% show 5 or more products from the same seller
The majority of shoppers encounter varied retailer options when browsing a Shopping carousel. But "all unique sellers" remains the exception, not the norm. Only about 1 in 7 carousels achieves it.
The products-per-seller ratio: a relatively stable metric
Beyond counting unique sellers, another useful lens is the products-per-seller ratio: the total number of products in a carousel divided by the number of unique sellers. A ratio of 1.0 means every seller appears exactly once. Higher ratios indicate repetition.
What makes this metric particularly striking is its consistency.
Tracked daily across all carousels from January through March 2026, the average products-per-seller ratio fluctuated only between 1.36 and 1.5. Day-to-day variation was minimal.
The distribution across carousels breaks down like this:
- 13.9% have a ratio of exactly 1.0 (perfect diversity: every seller appears once)
- 59.6% sit at 1.5 (some repetition, but limited)
- 22.8% reach 2.0 (on average, sellers show two products each)
- 3.7% show ratios above 2.0
When expanding the unit of analysis from individual carousels to full SERPs, which often contain 2 to 4 carousels and 16 to 32 total products, the ratio rises as expected:
- 4.1% of SERPs maintain a ratio of 1.0
- 34.8% show a ratio of 1.5
- 38.8% sit at 2.0
- 22.3% show ratios above 2.0
This makes intuitive sense. The more products Google shows across a page, the harder it becomes to maintain perfect diversity while still surfacing the most relevant items.
Walmart's multiseller strategy: 1,600+ seller names, one destination
Here's where the data gets interesting.
Walmart operates over 1,600 distinct seller names in Google Shopping results. No other retailer in our dataset comes close. Not by a small margin, but by an overwhelming one.
Examples of what this looks like in practice when you're searching Google:
Walmart
Walmart - Samodra Direct
Walmart - PHANCIR
Walmart - VARMINPOOL
Walmart - LUXE Bidet
Walmart - DiploMart
...and hundreds more
Every single one links back to Walmart.com. But to Google's diversity algorithm, each registers as a distinct seller.
The image below shows a real Google SERP containing 3 product carousels. Across those carousels, 8 different Walmart seller names appear as ranking products. Every seller name is unique, but every link points back to Walmart.com.
Google Merchant Center offers a multi-seller account setup designed to simplify marketplace management. Under this structure, individual third-party seller names are not displayed; all products are grouped under the main account's name, which significantly reduces operational overhead.
Based on what can be observed from external ranking data, Walmart appears to have taken the opposite approach: individual sub-accounts for each marketplace seller, allowing each seller's name to appear separately in Shopping results. At this scale, it is possible there is a custom arrangement not publicly documented, but the external data is unambiguous.
Shoppers may view this practice as misleading, which I think is a fair critique of Walmart from the consumer side of things. But from an SEO perspective, I think you have to tip your hat to Walmart. It's a brilliant play. Sure, there are SEOs out there who always play by Google's 'rules' and that's their business, but I think you really have to take your wins in the SERPs where and how you can get them. Walmart has done just that.
K
What the data reveals when you group Walmart's sellers
To understand the real competitive impact, we reran the analysis treating all Walmart-affiliated sellers (any seller name containing "Walmart") as a single entity, the way a shopper would naturally experience them.
The results are clear.
Products-per-seller ratio
Across all carousels in the dataset, the average products-per-seller ratio holds between 1.36 and 1.5. On SERPs containing Walmart products, with all Walmart sellers counted as one, the ratio is consistently higher throughout the entire measurement period, shifting the distribution in Walmart's favor every single day tracked.
Carousel distribution by max products from a single seller
| Max products from one seller |
All SERPs |
Walmart SERPs (grouped) |
Change |
| 1 (perfect diversity) |
13.9% |
9.3% |
-4.6pp |
| 2 |
39.8% |
37% |
-2.8pp |
| 3 |
24.7% |
27% |
+2.3pp |
| 4 |
12.4% |
15.2% |
+2.8pp |
| 5+ |
9.2% |
11.5% |
+2.3pp |
The share of carousels achieving perfect diversity drops by 33% on Walmart-containing SERPs when all Walmart sellers are counted as one. Meanwhile, the share of carousels where a single "seller" occupies 3 or more slots rises from 46.3% to 53.7%.
You can see why this works. It's a smart interpretation of how Google's Shopping ecosystem currently evaluates seller diversity, and Walmart has clearly leaned into that in a way that drives outsized visibility. Whether that's a deliberate workaround or simply an emergent advantage of marketplace scale, it's effective execution.
But the more interesting question is whether it actually detracts from the user experience. If those Walmart listings genuinely offer the best combination of price, availability and fulfilment, then you could argue this is no different to their position offline in the US, where they're a default destination for everyday purchases. In that sense, brand concentration isn't inherently a problem. The issue is when perceived diversity doesn't match reality. That's where this shifts from a clever strategy to a product question for Google, particularly as Shopping results play a bigger role in shaping entire product categories and purchase journeys.
W
Is this circumventing Google's diversity principles?
From a technical standpoint, Walmart appears to be operating within Google's established systems. Each seller name represents an actual third-party merchant selling through Walmart's marketplace. The structure is technically legitimate.
But the practical effect runs counter to the spirit of the diversity principle. When shoppers see five different sellers in a carousel, they expect five different stores with different experiences, shipping options, and return policies. When four of those five ultimately funnel to Walmart.com, that expectation is not being met.
Google has refined its diversity algorithms before when emergent patterns don't serve user intent. The 2019 site diversity update specifically targeted scenarios where too many results from the same domain crowded traditional search results. A similar refinement for Shopping could:
- Apply diversity limits at the domain level for marketplace platforms
- Weight seller name uniqueness differently when destination URLs remain the same
- Introduce transparency signals to clarify marketplace relationships in results
Any future algorithm update addressing this at the domain level could significantly impact Walmart's current visibility advantage. But until then, the gap is real and measurable.
Seeing that Google is amplifying Walmart and their multi-seller strategy, but the same behavior isn't observed from other major retailers like Target or Amazon, is very interesting. Especially coming off the heels of Walmart pulling back from instant checkout in ChatGPT, Walmart benefits greatly from maximum visibility in organic shopping.
But it raises the question of monopoly: even though they're all independent sellers, Walmart profits from every purchase regardless. Wouldn't Google have a responsibility to identify and diversify even further? This also hurts smaller brands who lose out due to a lack of inventory depth or defined brand authority, which many will never come close to matching.
J
The competitive implications
For marketplace platforms competing in organic shopping, Walmart's strategy shows a structural advantage most retailers simply don't have access to. Single-domain retailers, regardless of how well they optimize their product feeds, can only ever appear under one seller name. Walmart appears under hundreds.
This advantage compounds in competitive product categories where Walmart's marketplace includes numerous third-party sellers for the same item type. The more sellers they have listed, the more carousel slots they can potentially occupy. For traditional retailers, there is no equivalent lever to pull.
The interesting part of this study to me isn't whether this is technically allowed. It's the impact of the strategy. If a marketplace can occupy more carousel slots simply because of how its seller accounts are structured, that represents a competitive edge that most retailers don't have access to. Organic shopping isn't just another SERP feature anymore, it should be treated as a channel in its own right. Structure and intentional set up clearly matter.
C
The bigger picture: organic shopping is its own channel now
This study is a data point in a larger shift. Organic shopping is no longer a bonus feature that shows up occasionally. It is a primary surface where purchase decisions get made, and the rules of competition are fundamentally different from anything that came before it.
What this data makes clear is that organic shopping has become a serious channel that deserves the same strategic rigor as paid media or traditional SEO. For years, product visibility in Google was treated as an afterthought. That era is over.
With product carousels expanding across more query types, and Google beginning to integrate conversational commerce into the Shopping experience, we are entering the age of product SEO. Your Merchant Center structure, seller identity, and product data architecture matter as much as your title tags or backlinks ever did.
H
About this research
This study was conducted using Productrise data, a platform for tracking organic product visibility in Google. The analysis examined over 1 million product listings across more than 50,000 search results pages in the United States. Data was collected during Q1 2026, with the analysis window covering January 1 to March 24, 2026. All data reflects organic (non-paid) shopping results only.
Three key metrics were tracked: seller diversity within individual carousels (typically 8 products per carousel, varying by device), seller diversity across entire SERPs where multiple carousels often appear, and the products-per-seller ratio at both carousel and SERP level. The dataset included US-based, first-page queries only. The analysis focused exclusively on seller names as displayed in Shopping results; where multiple sellers were listed for a single product, only the first was used.
Fair use: You are welcome to reuse, reference, or republish the charts and findings from this study. When doing so, please attribute Productrise and link back to this article.
