If you've moved a brand from Amazon to Walmart and watched it stall, the usual culprit isn't your product — it's that Walmart's search engine, Polaris, rewards a different set of signals than Amazon's A9. Here's a plain-English look at what Polaris actually weighs, and how to align with it.
What Polaris is trying to do
Like any marketplace search engine, Polaris exists to put the listing most likely to result in a happy purchase at the top. It blends three broad buckets of signal: relevance (does this listing match what the shopper typed?), performance (do shoppers click, buy, and stay satisfied?), and fulfillment (can it ship fast and reliably?). Where Polaris differs from Amazon is in how heavily it leans on listing completeness and fulfillment signals.
The signals that move your position
1. Content completeness & attributes
Walmart explicitly scores every listing on how complete it is — title structure, key features, description depth, images, and especially attributes (the structured spec fields). Most sellers leave half the attribute fields empty. Filling them is one of the highest-leverage moves you can make, because Polaris uses them both to judge relevance and to match your product to filtered searches.
2. Listing quality score
Walmart surfaces a Listing Quality score in Seller Center. It's a useful proxy: push it into the band where the algorithm starts trusting your listing, and you typically see ranking follow. Content, imagery, attributes, and reviews all feed it.
3. Conversion & performance
Clicks and conversions feed back into ranking. A listing that wins the click but loses the sale will slide. This is why imagery, price position, and reviews matter for ranking — not just for the shopper.
4. Fulfillment & the 2-day badge
Fast, reliable shipping is weighted more visibly on Walmart than on Amazon. The 2-day delivery badge — most reliably earned through Walmart Fulfillment Services (WFS) — can lift both Buy Box win-rate and conversion. (Whether WFS is worth it for your margins is its own question — see our WFS guide.)
5. Reviews
Reviews drive both ranking and conversion. New Walmart listings often carry far fewer reviews than the category leaders, which quietly caps how high they can rank. Compliant review generation closes that gap over time.
How this differs from Amazon's A9
On Amazon, keyword relevance and sales velocity dominate, and you can sometimes brute-force ranking with ad spend. On Walmart, listing completeness and fulfillment signals carry more weight, and ad spend is cheaper but less able to paper over a weak listing. The practical takeaway: a listing that ranks on Amazon will not automatically rank on Walmart — it has to be rebuilt to Walmart's signals.
What to do about it
Start by auditing the gap between where your listings are and what Polaris rewards: title and attribute completeness, listing quality score, review depth versus competitors, and fulfillment setup. That's exactly what our 5-day Walmart Rank Audit measures — and it ends with a ranked 30-day plan you can run yourself.