⚡ THE ESSENTIALS IN 20 SECONDS
- Impression share is the percentage of available impressions your ads win for a search or target.
- Top-of-search impression share measures how often you appear at the top of the first results page.
- Amazon reports them in Sponsored Products, at campaign, target and search term level.
- They tell you how visible you are against competitors; they do not tell you whether being there is profitable.
IN THIS ARTICLE
Your campaign has a good ROAS, but are you showing up in half the searches or in 5%? Without knowing your impression share, you cannot tell whether you have room to grow or are already at the limit.
Impression share: the percentage of eligible impressions your ads won in a period. Top-of-search impression share is that percentage considering only the top placement on the first results page.
How it is calculated
Impression share = impressions you won ÷ impressions you were eligible for.
| Keyword (fictional) | Top-of-search impression share | Reading |
|---|---|---|
| steel water bottle | 8% | Lots of room to grow |
| nativa bottle (your brand) | 72% | Your brand is well protected |
| insulated bottle 1 liter | 35% | Competitive, but present |
Where to find it
- In the Amazon Ads console, in Sponsored Products campaign and targeting columns (“Top-of-search impression share”).
- In the search term report, with impression share and impression rank by term.
- In third-party tools that use this data to show trends.
Column names can change with console updates; check Amazon Ads documentation if you cannot find them.
Why top of search matters
The top of the first page usually concentrates more clicks and better conversion, but also the highest CPCs. That is why it is not always worth fighting for: it depends on your margin and the keyword.
When to push and when not to
| Situation | What to do |
|---|---|
| Profitable keyword with low share | Raise the bid or placement adjustment gradually |
| Your brand keyword with low share | Protect it: it is usually cheap and defensive |
| Unprofitable keyword with high share | Lower it: you are paying for visibility that does not pay back |
| Very expensive generic keyword | Look for more specific variants |
To know how much you can pay, calculate your break-even ACOS and maximum CPC before raising bids.
Impression share and share of voice
Impression share is a metric for your ads. Share of voice or share of search measures your total presence (organic + paid) in searches against competitors. They complement each other: you can have good paid impression share and still lose organic visibility. Read more in share of search.
How to improve it
- Check that your budget does not run out before the end of the day.
- Improve listing relevance so the auction favors you.
- Adjust placement bids on profitable keywords.
- Secure inventory and the featured offer.
- Review changes every week, not every day.
A typical case (fictional)
A coffee brand had 15% top-of-search impression share on its most profitable generic keyword while spending a lot on unprofitable broad keywords. It moved budget from broad terms to that keyword and raised the placement adjustment in 20% steps. It reached 40% share, sales on that keyword doubled and total ACOS stayed stable.
Impression share shows you where you have room to grow with what you already know works.
Common mistakes
- Wanting 100% impression share on everything.
- Raising bids without checking whether the budget runs out.
- Ignoring impression share on your own brand.
- Reading it without profitability context.
Checklist
- Impression share column active in your reports.
- Profitable keywords with low share identified.
- Brand protected with high share.
- Enough budget all day.
- Placement adjustments in small steps.
- Weekly review.
- A note of competitor activity on key terms.
Impression rank: the companion metric
Next to impression share, the search term report also shows impression rank: your position compared with other advertisers for that term. A rank of 1 with low share usually means budget or eligibility limits; a low rank with low share means you are being outbid or out-relevanced. Reading both together tells you which lever to pull.
Agency secrets about impression share
What I use on large accounts:
Keywords with good ROAS and low share are your cheapest growth.
Low share on your own brand usually means a competitor is conquesting your searches.
Impression share swings a lot day to day; decisions on weekly averages are more reliable.
Impression share is not a goal, it is a map: it shows where you can win more space without losing profitability.
I’m Alonso Jiménez, a Retail Media account director. I manage campaigns on Amazon, Walmart, Target, Instacart and Mercado Libre every day, for brands in the US, Mexico and Latin America.
Frequently asked questions
What is impression share in Amazon Ads?
The percentage of eligible impressions your ads won in a period.
What is top-of-search impression share?
The percentage of impressions you won at the top of the first results page.
Where do I see impression share?
In Sponsored Products campaign and targeting columns and in the search term report.
Should I aim for 100% impression share?
No; aim for the level your profitability allows on each keyword.