🍰 Share of Voice per Bestseller Category

Dashboard link: https://app.emax-digital.com/brand-share-of-voice-in-bestseller-list-in-market-insights

Overview

The Share of Voice per Category dashboard tracks how visible your brand — and any competitor brand you choose to compare against — is in Amazon's Top 100 Bestseller lists over time. Every product that appears in a category's bestseller chart is attributed to a brand, and the dashboard converts those appearances into a share of voice percentage per brand per period. This gives you a clear, time-series view of whether your brand is gaining or losing presence in the most commercially important rankings on Amazon.

Underneath the share-of-voice trend, you also get a product-level detail table showing every ASIN currently in the chart for the selected brands, with rank, rank movement, demand estimates, pricing, ratings, and chart longevity.

This dashboard is part of the Market Insights add-on suite and works for both Vendor and Seller catalogues.

What You Can See on This Dashboard

Section: Brand Share of Voice — Visibility Trend Over Time

The main chart on the dashboard. For the brands you select, it plots each brand's share of total bestseller chart appearances in the chosen category over time.

How share is calculated: For each date (or week / month, depending on the aggregation filter), the number of chart appearances attributed to a brand is divided by the total appearances across all brands in that category, expressed as a percentage. Brand attribution uses the product catalogue as the primary source, falling back to the manufacturer field where brand is unavailable.

Key metrics:

• Share of Voice (%) — A brand's share of all chart appearances in the selected period.

• Chart Appearances (Count) — The underlying number of bestseller-list appearances per brand per period.

Visualizations:

• Line chart with one line per selected brand, showing share of voice (or appearance count) by date / week / month according to the Timerange Aggregation filter.

• History covers up to 24 months.

Section: Bestseller Chart — Brand Product Detail View

A detailed product-level table showing every ASIN in the selected bestseller chart that belongs to the selected brands, ordered by monthly purchases so the highest-demand products surface first.

Key columns:

• Rank — The product's most recently observed bestseller rank in the selected category.

• Trend — Rank movement versus the prior period. A positive trend means the product has climbed the chart.

• Image / ASIN / Product Title / Brand / Bestseller Category — Product identification.

• Bought Last Month — Number of purchases in the last month as reported by Amazon on the product detail page.

• Min. Sales Estimation — A conservative revenue estimate calculated as Bought Last Month × average observed price. The currency in the column header automatically reflects the selected marketplace.

• Price — Average observed price across all crawls in the selected period (in marketplace currency).

• # Ratings — Total number of customer reviews observed in the most recent crawl within the selected period.

• Rating — Star rating observed in the most recent crawl within the selected period.

• Number of Days in Top 100 — How many distinct days this ASIN appeared in the top 100 during the selected period — a measure of how consistently it holds chart position.

• Last Date in Top 100 — The most recent date the ASIN was observed in the top 100.

Available Filters

Filter interaction notes

• Brands is a required filter. The dashboard will not render until at least one brand is selected. To compare your brand against competitors, add all the relevant brands here — each will appear as its own line in the trend chart.

• Bestseller Category and Marketplace are dynamic and reload based on the categories your account is tracking for each marketplace. Bestseller lists must be configured under the Data Input section for a category to appear here — if you have a Vendor or Seller catalogue connected, the categories of your own products are tracked automatically.

• Tag(s) scopes the product detail table to ASINs carrying the selected tags. It does not affect the share-of-voice chart, which is always computed across the full chart.

• Timerange Aggregation controls only the granularity of the trend chart; the product detail table always shows the most recent observation per ASIN.

Use Cases

1. Monthly competitive visibility review — Pick your category, add your brand plus the 3–5 competitors that matter most, set Timerange Aggregation to Monthly, and read the trend chart. If a competitor's line is rising steadily while yours is flat, you are losing chart real estate and should investigate (new launches, price changes, advertising push, etc.).

2. Measure the impact of a launch or campaign — Switch Timerange Aggregation to Weekly or Daily around the launch window and watch whether your share of voice steps up in the weeks following the campaign. This is the cleanest way to attribute Amazon-side visibility to off-Amazon or DSP activity.

3. Spot a competitor's new bestseller before it scales — Use the product detail table sorted by Bought Last Month and check the Trend column for products climbing fast. ASINs with a strong upward rank trend and a high Number of Days in Top 100 are the ones taking your share.

4. Identify which of your own ASINs are doing the heavy lifting — Filter Brands to your own brand only and read the detail table. The ASINs with the highest Number of Days in Top 100 are your most consistent chart performers — these are the products to protect with stock, pricing, and advertising.

5. Category expansion scouting — Run the dashboard across categories adjacent to your current assortment. Categories where the top brands have low concentration (no brand above ~15–20% share of voice) are typically easier to enter than categories dominated by one or two players.

Limitations & Notes

• Bestseller lists must be set up. A category will only appear in the filter list if its bestseller chart is being tracked. If you have a Vendor or Seller catalogue connected, your own categories are tracked automatically; additional competitive categories need to be added under Data Input → Bestseller Lists.

• Brand attribution. Attribution uses the brand field from the product catalogue first, falling back to the manufacturer field where brand is missing. ASINs without either field will not be attributed to any brand and are excluded from share-of-voice calculations.

• Top 100 only. Only chart positions 1–100 are tracked. A product slipping from rank 95 to rank 110 will simply disappear from the data — it does not show up as "rank: 110".

• Sales estimation is conservative. The Min. Sales Estimation column uses Amazon's publicly displayed "bought last month" figure, which is itself rounded and capped. Real sales volumes are typically higher; treat this column as a comparative signal, not an absolute number.

• Price column can be empty. ASINs for which Amazon restricts price data (e.g. add-to-cart-only listings, certain Vendor-only displays) will show no price and no sales estimation.

• Most recent observation per ASIN. The product detail table shows the latest snapshot for each ASIN in the period — it is not a daily history. For day-by-day movements use the share-of-voice trend chart.

• Up to 24 months of history. The share-of-voice trend chart cannot go further back than 24 months.

• One marketplace at a time. The Marketplace filter is single-select. Compare marketplaces by running the dashboard twice.

Data Refresh

Data updates daily.