Amazon’s Rumored Buy Box Algorithm Overhaul Is Rattling Top Sellers

Something is shifting inside Amazon’s Buy Box engine, and the seller community is running out of ways to explain it away as seasonal noise. Over the past six weeks, a growing number of high-volume Amazon sellers have reported unexplained Buy Box losses on listings where they hold the lowest price, maintain strong seller metrics, and operate entirely on FBA — conditions that, under the old model, would have been a near-guarantee of the win. Sources close to the matter say Amazon is internally testing a revised Buy Box weighting system that significantly elevates last-mile delivery speed, regional fulfillment proximity, and in-stock consistency over raw price competitiveness.

The shift, if confirmed, would represent the most substantive change to Amazon’s Buy Box algorithm since the company began factoring in Prime eligibility in the mid-2010s. Amazon has not made any public announcement, and a spokesperson declined to comment for this story. But the circumstantial evidence circulating inside seller forums, agency Slack groups, and third-party software dashboards is hard to ignore.

What Are Sellers Actually Seeing on Their Dashboards?

The pattern is consistent enough to have caught the attention of major software vendors. Sellers using Helium 10’s Market Tracker 360 and Jungle Scout’s Cobalt enterprise dashboard have reportedly flagged anomalies in Buy Box ownership data as far back as late May 2026. One category manager at a top-20 Amazon agency — who asked not to be named — described pulling a client’s Buy Box suppression report and finding that a listing with a 4.9 seller rating, 98.7% on-time delivery, and a price sitting 3% below the next competitor had lost the Buy Box to a seller with a 4.6 rating priced 7% higher but operating out of an Amazon regional fulfillment center in the buyer’s metro area.

“We’ve seen Buy Box logic do weird things before, but this is different. It’s not random. There’s a geographic proximity pattern we can’t explain under the current ruleset,” said Fahim Naim, founder of eShopportunity, a New York-based Amazon consulting firm with over $400M in managed revenue. “We’re advising every client with more than three SKUs to audit their IPI score and inbound placement strategy immediately.”

Naim’s concern is shared across the agency world. Brandon Young, CEO of Seller Systems and a well-known voice in the Amazon FBA community, reportedly told attendees at a private seller mastermind in Austin last month that he believes Amazon is “stress-testing a fulfillment-first Buy Box model” ahead of a potential public rollout. Young did not respond to a request for comment, but two attendees independently confirmed the remarks.

Is Amazon Quietly Punishing Sellers Who Ignore Inbound Placement?

The timing of these Buy Box anomalies is not lost on sellers who have been fighting Amazon’s Inbound Placement Fee structure — introduced in 2024 and expanded in early 2026 — which charges sellers for the “convenience” of shipping to a single warehouse rather than distributing inventory across Amazon’s regional FC network. Sellers who pay the fee get consolidated inbound logistics. But sources allege that Amazon may now be algorithmically favoring sellers whose inventory is already distributed across regional nodes, effectively creating a two-tier fulfillment class inside FBA itself.

If true, this would mean that sellers absorbing the inbound placement fee to simplify their logistics are now potentially being penalized twice: once at the fee level, and again at the Buy Box level. That’s a hypothesis that has lit up the Seller Central community boards and private Facebook groups like the 60,000-member “Amazon FBA High Rollers” group, where threads on the topic have reportedly crossed 400+ comments in under 48 hours.

• Sellers using Amazon’s “Inventory Placement Service” (single-node inbound) are reportedly seeing Buy Box loss rates 12-18% higher than sellers using distributed inbound, according to internal data shared by one agency
• FBM sellers with next-day shipping capabilities in certain metro zip codes are allegedly winning Buy Box shares they haven’t seen since pre-Prime dominance
• Some sellers are reportedly testing a hybrid FBA/FBM split specifically to game what they believe is the new proximity weighting
• Repricing tools including Feedvisor and Seller Snap have not yet issued formal guidance, though sources say both companies are “actively monitoring” the anomalies

What Does This Mean for Third-Party Repricing Software?

If Amazon’s Buy Box logic is genuinely de-emphasizing price as a primary variable, the downstream consequences for the repricing software industry could be significant. Companies like Feedvisor, Seller Snap, and BQool have built their entire value propositions on price-driven Buy Box optimization. A model where fulfillment geography and delivery speed outweigh price signals would render traditional repricing logic less effective — potentially overnight.

“Every repricing tool on the market right now is optimized for a price-first world. If Amazon flips the table and makes proximity the new price, we’re going to see a scramble in the software space that makes the Sponsored Products shake-up of 2022 look minor,” said one senior Amazon strategist at a large DTC brand, speaking on condition of anonymity.

Sources close to Feedvisor say the company’s data science team is “in active investigation mode” but has not reached a conclusion about whether the anomalies represent a systematic change or A/B testing noise. A Feedvisor spokesperson did not respond by press time. Seller Snap’s team reportedly pushed an internal memo to enterprise clients last week flagging the Buy Box irregularities as “under review” — language that itself raised eyebrows among agency partners who interpreted it as confirmation that something is structurally different.

Are Walmart and eBay Ready to Capitalize on Amazon Seller Frustration?

The timing couldn’t be more interesting from a competitive standpoint. Walmart Marketplace has been aggressively courting Amazon sellers throughout Q2 2026, reportedly offering reduced referral fees on select categories and waiving Walmart Fulfillment Services (WFS) onboarding fees for sellers with annual Amazon revenue above $1M. If Amazon’s Buy Box changes create real uncertainty around the economics of FBA — particularly for mid-tier sellers moving $500K to $5M annually — Walmart’s pitch becomes significantly more compelling.

Walmart’s head of marketplace seller growth, Manish Joneja, has been unusually public about the opportunity in recent weeks, making appearances at SellerCon and Prosper Show side events to pitch WFS as a “transparent, rules-based fulfillment model” — a line widely interpreted inside the seller community as a direct shot at Amazon’s increasingly opaque algorithmic environment. Joneja did not respond to a request for comment.

eBay, meanwhile, is reportedly watching the situation closely. Sources inside the eBay seller ecosystem say the company’s managed payments team has been in direct outreach to a handful of large Amazon third-party sellers, emphasizing eBay’s lack of a Buy Box mechanism entirely as a selling point for sellers frustrated by algorithmic unpredictability.

How Are Top Amazon Agencies Advising Clients Right Now?

With no official word from Amazon, agencies are operating in an information vacuum — and their advice is diverging sharply. At least three major Amazon-focused agencies are reportedly telling clients to immediately diversify inbound shipments across multiple FCs, even if it means absorbing higher per-unit freight costs. Others are advising a “wait and see” posture, arguing that acting on unconfirmed algorithm changes is how brands waste margin chasing ghosts.

“Our stance right now is to audit every ASIN with a Buy Box loss in the last 45 days and cross-reference it against inbound placement type and buyer zip code data. If the proximity hypothesis holds, we’ll see the pattern. If it doesn’t, we haven’t hurt anyone,” said one agency director at a Chicago-based Amazon consultancy managing over $200M in annual GMV.

What’s clear is that the uncertainty itself is already costing sellers. Buy Box losses on even high-velocity ASINs translate directly to revenue suppression — and with Prime Day 2026 having just concluded, sellers entering Q3 with degraded Buy Box ownership are staring at a compounding problem heading into the most important fulfillment quarter of the year.

Will Amazon Officially Acknowledge Any Buy Box Changes?

That question is almost certainly a no — at least in the short term. Amazon has a well-documented history of making consequential algorithm adjustments without public disclosure, from the 2023 search ranking overhaul that buried exact-match keyword strategies to the gradual suppression of incentivized review programs that predated any formal policy update. Sellers and agencies have learned, often painfully, that the gap between what Amazon does and what Amazon says can be measured in quarters.

What sellers can do is pressure third-party tools to get sharper faster. Sources suggest that Helium 10 is planning a Buy Box diagnostic feature update within its Seller Dashboard product that would flag proximity-correlated losses specifically. If that ships before Amazon says anything official, it may become the de facto standard for understanding what’s actually happening inside the algorithm — and that would be a significant moment for the independent Amazon tooling ecosystem.

For now, the unofficial consensus inside the seller community is cautious but unmistakable: something has changed, nobody outside of Seattle fully understands it yet, and the sellers who adapt first will be the ones who win Q4.