On Amazon, one product detail page can have many sellers offering the same item. The Buy Box, officially renamed the Featured Offer, is the panel at the top right of the page (top of screen on mobile) that holds the price, delivery promise and the Add to Cart and Buy Now buttons. Amazon chooses one seller's offer to sit there. Because most shoppers never open "Other sellers on Amazon", the Featured Offer takes the large majority of orders, and Sponsored Products ads for that ASIN are only shown when the advertiser's offer is the Featured Offer.
How the Buy Box is decided
Amazon does not publish a formula, but its seller guidance lists the factors it weighs: competitive price (landed price including delivery, at or below comparable offers), delivery speed and certainty (Prime and fast, free delivery are favoured), seller performance (order defect rate, late shipment, cancellations, customer feedback) and stock availability. In India, offers fulfilled through FBA or Easy Ship with Prime eligibility have a structural advantage on the delivery factor. A Professional selling plan is required to be eligible at all, and new sellers usually need a short performance history before they win consistently.
Worked example: two sellers list the same 1 litre mixer grinder. Seller A prices at ₹2,499 with FBA Prime delivery and a 0.4% order defect rate. Seller B prices at ₹2,449 self-shipped with 4 to 6 day delivery. Amazon will usually feature Seller A despite the ₹50 higher price because delivery and reliability outweigh the small gap. If Seller B drops to ₹2,299, the panel may rotate to B for part of the day.
Why the Buy Box matters for sellers
Losing the Featured Offer on your own product means your listing page still gets traffic, but a reseller collects the orders. If you are the brand owner and unauthorised resellers keep undercutting, this is the mechanism by which they capture your sales. Ads make it worse: you cannot even run Sponsored Products on the ASIN while another offer is featured. Amazon may also show no Featured Offer at all if every price looks too high against recent history, which is the "suppressed Buy Box" state sellers see as a "See all buying options" button.
How to win and keep the Buy Box
- Price on landed cost. Use Automate Pricing rules to stay at or just below the competing offer including delivery.
- Get Prime eligibility through FBA or Seller Flex; delivery promise is weighted heavily.
- Keep account health green: order defect rate under 1%, late shipment under 4%, cancellations under 2.5% as of September 2026.
- Never run out of stock. An out-of-stock offer cannot be featured.
- Control distribution. Brand Registry, Transparency and tightened wholesale terms limit unauthorised resellers competing for your own page.
Blooprint monitors Featured Offer share daily under Amazon account management; the Amazon seller fees guide explains the FBA costs that affect landed price.