Top Buy-Box-Loss ASINs, Amazon Seller Central

Top Buy-Box-Loss ASINs for Amazon Seller Central accounts. Tracked live in Vortex IQ Nerve Centre. How to read it, why it matters, and how to act on it.

Metrics type: Supporting Metrics • Category: Buy-Box & Visibility

At a glance

The marketplace manager’s action queue. A per-ASIN table of where you are losing the Buy Box, showing buy-box win percentage, units lost, and estimated revenue at risk, ranked by impact. When you do not hold the Buy Box, your offer is buried below the “buy” button and almost nobody buys from you, so every percentage point of Buy Box loss on a high-revenue ASIN is direct lost sales. This card turns that loss into a prioritised worklist.

What it counts	For each ASIN where you are losing the Buy Box: the buy-box win percentage, the estimated units lost to other sellers, and the estimated revenue at risk, ranked by the size of the loss.
Buy Box basics	The Buy Box is the default “Add to Basket” offer on a detail page. The large majority of Amazon sales go through it. Losing it sends your sales to whichever seller (or Amazon Retail) wins it.
Why you lose it	A higher-priced offer than competitors, a worse fulfilment promise (FBM vs FBA, slower delivery), low seller-performance metrics, or being out of stock so a third-party seller wins by default.
Revenue-at-risk basis	Units you would likely have sold at your Buy Box win rate, valued at price. It is an estimate of the sales leaking to other sellers, not a settled figure.
Relationship to other cards	The portfolio version is Buy-Box Win Rate (top-50 ASINs); the money total is Estimated Revenue Lost to Buy-Box Loss. This card is the per-ASIN drill-down.
Chart	Table, ranked by revenue at risk.
Unit	Currency (revenue at risk), with supporting percentage and unit columns.
Time window	30D.
Alert trigger	None on this card itself; the burst alert lives on Buy-Box Loss Burst.
Roles	owner, marketing, finance

Calculation

Calculated automatically from your Amazon Seller Central data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

Worked example

A UK consumer-electronics accessories brand on FBA with some FBM lines. Period: 01 Apr 26 to 30 Apr 26 (30D).

ASIN	Product	Buy-Box win %	Est. units lost	Est. revenue at risk	Likely cause
B0XXXX1	USB-C hub	58%	410	£8,200	Undercut on price by 2 resellers
B0XXXX2	Laptop stand	71%	180	£3,960	FBM offer, slower delivery promise
B0XXXX3	Cable organiser	64%	240	£2,160	Intermittent stockouts handing default to others
B0XXXX4	Wireless charger	82%	90	£1,620	Occasional price test above competitors
Top Buy-Box-Loss ASINs (this card)			920	£15,940

Total estimated revenue at risk  =  £15,940 across the top losses
Largest single loss              =  B0XXXX1 USB-C hub (£8,200, 51% of the total)
Win-rate range                   =  58% to 82%

Three things to notice:

1. One ASIN is half the bleed. The USB-C hub at 58% win rate is £8,200 of the £15,940. Buy Box loss, like revenue, is usually concentrated. Fix the biggest loss first; it is worth more than all the smaller ones combined.
2. Each loss has a different lever. The hub is a pricing problem (resellers undercutting), the laptop stand is a fulfilment problem (move it to FBA or improve the delivery promise), and the cable organiser is a stock problem (it loses the Buy Box every time it runs low). Read the cause column before acting, the fix for one will not fix the others.
3. Cross-reference revenue rank. A Buy Box loss on a top-revenue ASIN is an emergency; the same loss on a long-tail ASIN can wait. Compare this list against Top ASINs by Revenue to set the true priority.

The action is a triage list: re-price or address the reseller competition on the hub, convert the laptop stand to FBA, tighten stock cover on the cable organiser, and stop the price tests on the wireless charger. Pair with Estimated Revenue Lost to Buy-Box Loss for the account-level total.

Sibling cards merchants should reference together

This is the drill-down. These give the summary, the trend, and the money:

Card	Why pair it with Top Buy-Box-Loss ASINs
Buy-Box Win Rate (top-50 ASINs)	The portfolio summary. This card is the per-ASIN breakdown behind that average.
Estimated Revenue Lost to Buy-Box Loss	The account-level money total of everything in this table.
Buy-Box Loss Burst	The real-time alert that a sudden Buy Box loss has just happened, your early warning to look at this list.
Buy-Box Trend (top revenue ASINs)	Whether each ASIN’s Buy Box situation is improving or worsening over time.
Top ASINs by Revenue	Cross-reference: a loss on a top-revenue ASIN is the highest priority in this table.
ASINs with Third-Party Offers	Identifies which ASINs have competing sellers, the usual reason you lose the Buy Box.

Reconciling against Amazon Seller Central

Where to look in Seller Central:

The closest Amazon-native view is:

Seller Central → Reports → Business Reports → Detail Page Sales and Traffic by Child Item, the Featured Offer (Buy Box) Percentage column per ASIN. Amazon now calls the Buy Box the “Featured Offer”. The percentage column there is the basis for this card’s win-rate figures.

Amazon does not provide a ready-made “revenue at risk” column. This card estimates that by combining your win percentage, your sales rate, and price, so it is an analytical layer on top of Amazon’s raw Featured Offer percentage.

Timing and reporting-lag table:

Topic	Detail
Win-rate basis	Built on Amazon’s Featured Offer (Buy Box) percentage from Business Reports, which is session-weighted over the period.
Revenue-at-risk estimate	An analytical estimate, not an Amazon-reported figure. It models the units you likely would have sold had you held the Buy Box. Treat it as directional.
Reporting lag	Featured Offer percentage updates with Business Reports, so the prior day finalises after midnight local time and “today” is incomplete.
Stockout-driven loss	When you are out of stock, your win percentage drops because a third-party seller wins by default; this shows here even though the cause is inventory, not price.

Why our number may legitimately differ from Seller Central:

Reason	Direction	Why
Revenue at risk is modelled	Estimate, not reported	Amazon gives the Featured Offer percentage but not a revenue-at-risk figure. This card derives it, so it will not appear anywhere in Seller Central to tie out against.
Featured Offer naming	Same concept	Amazon’s “Featured Offer percentage” is the Buy Box win rate. If the terminology looks different, it is the same metric.
Period alignment	Edge differences	Session-weighted percentages over a 30D window can differ slightly from a manually summed view at the boundary.

Cross-connector reconciliation:

Card	Expected relationship	What causes legitimate divergence
MAP / pricing on other channels	Pricing pressure can cross channels. If resellers are undercutting you on Amazon, the same product’s price discipline on your DTC site is worth checking.	A reseller sourcing stock cheaply may undercut both your Amazon Buy Box and your DTC price; review MAP Violation Risk (vs DTC) alongside this list.

Known limitations / merchant FAQs

Is the “revenue at risk” figure exact? No. It is an analytical estimate that models the sales you likely would have made had you held the Buy Box, based on your win percentage, sales rate, and price. Amazon does not report a revenue-at-risk number, so treat this as directional, useful for ranking and prioritising, not as a settled figure.

Amazon calls it “Featured Offer” now, not “Buy Box”. Is this the same thing? Yes. Amazon renamed the Buy Box to the “Featured Offer”, and the Featured Offer (Buy Box) percentage in Business Reports is the win rate this card uses. The concept is unchanged: it is the default purchase offer on the detail page.

Why am I losing the Buy Box if my listing looks fine? Common causes are price (a competitor undercut you), fulfilment (an FBM offer with a slower delivery promise loses to FBA), seller-performance metrics, or being out of stock so another seller wins by default. The cause column points you at the right lever; the fix differs by cause.

An ASIN here also tops my revenue list. How urgent is that? Very. Buy Box loss on a top-revenue ASIN is the most expensive problem in the account, because the loss is a large percentage of a large number. Treat any overlap between this card and Top ASINs by Revenue as a same-day priority.

Does running out of stock show up as a Buy Box loss here? Yes. When you are out of stock, a third-party seller wins the Buy Box by default and your win percentage falls, so the ASIN appears here even though the root cause is inventory. Fix it on the stock side via ASINs Stocking Out <7 Days, not by re-pricing.

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Tracked live in Vortex IQ Nerve Centre

Top Buy-Box-Loss ASINs is one of hundreds of KPI pulses Vortex IQ tracks across Amazon Seller Central and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English.

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