Top impression share is a Google Ads search metric that shows the percentage of searches you were eligible for in which your ad appeared in the top block of ads, above the organic results. It answers a simple question: of all the chances you had to be near the top of the page, how many did you take?
How top impression share works
Google estimates how many impressions your ads could have received, based on your keywords, locations, schedule and other settings. It then counts the impressions where your ad sat among the top ads. Divide the second number by the first and you have your top impression share, shown in the column called Search (Top) IS.
A worked example: a London plumbing firm’s campaign is eligible for an estimated 2,000 searches in a week. Its ads show 1,200 times, and 700 of those are above the organic listings. Impression share is 60%, and top impression share is 35%. The other 1,300 eligible searches either showed the ad lower down the page or not at all.
Two companion columns tell you why you missed the top. Search lost top IS (rank) is the share lost because your Ad Rank was not high enough, which comes down to bids, ad quality and expected click-through rate. Search lost top IS (budget) is the share lost because the daily budget ran short. There is also a stricter version for first place only, covered under absolute top impression share.
Why it matters
Ads above the organic results tend to get far more of the clicks than ads at the bottom of the page, so this figure tells you how visible you really were at the moments that count. For a brand campaign, a low top share often means a competitor is outbidding you on your own business name. For a high-intent term such as “emergency electrician Croydon”, it shows how often you were in the place people actually look.
It also separates two problems that look the same in a cost report. If you are losing top share to rank, raising the budget will not help; you need better ads, landing pages or bids. If you are losing it to budget, the ads are good enough but the money runs out.
Common mistakes
- Confusing it with top of page rate. That metric measures what share of the impressions you did get were at the top. Top impression share measures against every search you could have appeared on.
- Chasing 100% on every keyword. The last few points are usually the most expensive, and broad, low-intent terms rarely justify the cost.
- Reading it on a day or two of data. The estimates behind it are noisy at low volumes, so look across weeks.
- Raising bids without checking lost top IS (budget) first, which spends more per click while the campaign still runs out by lunchtime.
How to act on it
Add Search (Top) IS and both lost top IS columns to your campaign and keyword views. Look first at brand terms and your most profitable keywords; those are where top visibility is worth paying for. If rank is the cause, improve ad relevance and the landing page before raising bids. If budget is the cause, move money from weaker campaigns or narrow the targeting.
Compare the figure with auction insights to see which competitors appear above you and how often. Where staying at the top is the goal in itself, a target impression share bid strategy can hold the position for you, with a bid limit set. Reading these metrics together is routine in the Google search ads management I offer.