At a glance
The shape of your Buy Box ownership over time on the ASINs that matter most. Where the win-rate card gives you today’s snapshot, this line chart shows the trajectory across the period for your top-revenue ASINs, so you can tell a sudden break (a competitor appeared, you went out of stock) from a slow erosion (a creeping price gap, a slipping seller metric). A 90-day line is long enough to see seasonal repricing wars and short enough to act on.
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 consumer-electronics brand on Amazon US tracking its top 20 revenue ASINs, 90-day window ending 01 May 26. All numbers illustrative.
Five things to notice:
- The 27 Mar to 03 Apr fall is a competitor, the 17 Apr dip is a stockout. Both look like Buy Box loss, but the shapes differ. The competitor cost a sustained 6 to 12 points; the stockout was a sharp one-week crater that snapped back on replenishment. The fixes are completely different.
- The 17 Apr week breached the alert. Dropping from 86% to 71% is a 15pp week-on-week fall, well past the
drop >5pp WoWthreshold. Vortex IQ Nerve Centre flagged it, and the cause turned out to be inventory, not price. - Aggregating top-20 ASINs hides single-ASIN drama. A 15pp aggregate drop driven by one ASIN going to zero means that one ASIN cratered while the other 19 held. Drill into the per-ASIN view, Top Buy-Box-Loss ASINs, before reacting at the portfolio level.
- Partial recovery is a signal, not a victory. The bounce from 82% to 86% after the repricer matched shows the price move helped but did not fully reclaim the Buy Box. The remaining gap usually points to a fulfilment or metrics disadvantage, not price.
- Use the trend to set the right battle. A flat-high line means leave it alone. A persistent slope means investigate structurally (reviews ageing, metrics slipping). A step means find the event. The trend tells you which kind of problem you have.
Sibling cards merchants should reference together
The trend tells you the shape; these tell you the size and cause:Reconciling against Amazon Seller Central
Where to look in Amazon Seller Central:Seller Central → Reports → Business Reports → Detail Page Sales and Traffic by Child Item. The Buy Box Percentage column per ASIN is the underlying value. Run the report across a date range and plot the column to approximate the card’s line.Amazon does not provide a ready-made multi-ASIN Buy Box trend chart; this card aggregates and visualises the per-ASIN Buy Box Percentage over time for you. Timing, settlement, and reporting-lag table:
Why our number may legitimately differ from Business Reports:
Cross-connector reconciliation against other connectors the same seller may run:
Known limitations / merchant FAQs
Why is the line aggregated instead of per-ASIN? A single chart per ASIN across 50 ASINs is unreadable. The aggregate line gives you a portfolio health signal; when it moves, drill into Top Buy-Box-Loss ASINs for the specific ASINs. A drop fired the alert but my prices have not changed. Why? Buy Box share depends on more than price. The usual non-price causes are a stockout (share goes to zero), a new third-party offer, or a seller-metric breach (late shipments, order defects) that reduced your Buy Box eligibility. Check inventory and account-health cards first. The trend dipped and recovered on its own. Should I do anything? A self-recovering dip is usually a transient competitor undercut or a brief stockout. If it recovers within a week and does not recur, no action is needed. Persistent or repeating dips deserve investigation. Why does adding a new product change the whole line? The aggregate is computed over your top-revenue ASIN basket. When a new launch enters that basket, the mix changes and the line can step even though no individual ASIN’s win rate moved. This is expected. Can I change the alert threshold? Yes. Thedrop >5pp WoW default is configurable per profile in the Alert Rules tab. Tighten it if you run thin-margin ASINs where small Buy Box losses hurt, loosen it if your category is naturally volatile.