The auction insights report in Google Ads compares your performance with other advertisers competing in the same auctions you are. It shows exactly who you go up against, how often you show together, and who wins more of those head-to-head comparisons, using real auction data rather than an estimate. Most advertisers open it once, glance at the percentages, and close it again. Read correctly, it tells you exactly why your impression share is what it is and what to fix.
The auction insights report lets you compare your performance with other advertisers who are participating in the same auctions that you are, in Google's own description. Unlike most Google Ads reporting, which shows you your own account in isolation, this report pulls in real, anonymized data about the specific competitors you actually go head-to-head with, keyword by keyword and campaign by campaign.
That makes it one of the few places in Google Ads where you see genuine competitive context instead of just your own numbers. You can filter it down to a single keyword, ad group, or campaign to see exactly who you are fighting for that specific query, which is far more actionable than a generic "average CPC in your industry" benchmark.
Search, Shopping, and Performance Max campaigns, according to Google Ads Help. The depth of data differs by type: Search campaigns get all 6 available metrics, while Shopping and Performance Max campaigns get 3, impression share, overlap rate, and outranking share, since position-based metrics like top of page rate do not apply the same way outside a ranked text-ad auction.
Most guides paraphrase these loosely enough that the nuance gets lost. Here is what Google's own Help documentation says, word for word.
The distinction worth internalizing: overlap rate tells you how often you compete with someone, while outranking share tells you who wins. A high overlap rate with a competitor is not itself bad news; check outranking share alongside it before drawing any conclusion.
Compare Search Lost IS (budget) against Search Lost IS (rank); whichever is higher tells you what to fix. If your impression share sits at 30% and Search Lost IS (budget) is 40%, your daily budget is the ceiling; raising it, not your bid, is what recovers lost impressions. If Search Lost IS (rank) is the larger number instead, the constraint is your Ad Rank, meaning bid, Quality Score, or ad relevance need attention before more budget would help at all.
Run this check before touching your bids blindly. Raising a bid when the real constraint is budget wastes spend without moving impression share, and raising a budget when the real constraint is rank just burns through that budget faster at the same low position. Our guide to how to audit Google Ads covers the fuller diagnostic pass this fits into, including the account-level checks that catch problems auction insights alone will not show you.
Two thresholds cause most gaps. Google Ads excludes rows where your impression share is below a low threshold, and it also requires a campaign, ad group, or keyword to meet a minimum threshold of activity before it appears in the report at all, according to Google Ads Help. Brand-new campaigns and low-volume, long-tail keywords are the most common places this shows up, and it usually resolves itself once enough auction volume accumulates.
What is the auction insights report in Google Ads? The auction insights report lets you compare your performance with other advertisers competing in the same ad auctions you are, according to Google Ads Help. It shows how often you appear alongside specific competitors, how often you outrank them, and how often they outrank you, using data pulled straight from the auctions your ads actually competed in.
What campaign types support the auction insights report? Search, Shopping, and Performance Max campaigns, according to Google Ads Help. Search campaigns get all 6 metrics; Shopping and Performance Max campaigns get 3: impression share, overlap rate, and outranking share.
What does overlap rate mean in Google Ads auction insights? Overlap rate is how often another advertiser's ad received an impression at the same time yours did, in Google's own words. A 60% overlap rate with a competitor means your ads showed together in 6 out of every 10 impressions where either of you appeared.
What does outranking share mean? Outranking share is how often your ad ranked higher in the auction than a specific competitor's ad, or showed when theirs did not show at all, per Google's definition. A 20% outranking share means you won that comparison in 2 of every 10 shared auctions.
Why is my impression share low in auction insights? Two causes account for almost every case: budget or rank. Check Search Lost IS (budget) against Search Lost IS (rank) in your campaign metrics. If the budget figure is higher, your daily budget is capping impressions before rank ever becomes the limiting factor. If the rank figure is higher, your bid, Quality Score, or ad relevance need work instead.
Why do I see "data not available" in auction insights? Google Ads excludes rows where impression share is below a low threshold or where a campaign, ad group, or keyword has not met a minimum threshold of activity, according to Google Ads Help. Low-volume keywords and brand-new campaigns commonly show gaps in the report for this reason.
How often should I check auction insights? A weekly glance for active campaigns and a deeper monthly review works for most accounts. Check it immediately after a bid strategy change, a new competitor entering your space, or a sudden shift in impression share, since those are the moments the report explains what changed and why.
Does a high overlap rate mean I am losing to that competitor? No. Overlap rate only measures how often you both show up in the same auction, not who wins. A high overlap rate paired with a high outranking share in your favor means you are beating that competitor most of the time you compete with them; check both metrics together, not overlap alone.
Open your account's auction insights report, filter to your top three converting keywords, and compare Search Lost IS (budget) against Search Lost IS (rank) for each. Fix whichever one is actually capping you before you touch bids or budgets across the whole account, and check back monthly to see whether the competitive picture has shifted.
If you would rather have someone run the full diagnostic across your account, not just one report, request a free Rankite marketing audit and we will show you where the spend is actually going and what is capping your results.
Get a free, no-obligation SEO audit and a 30-minute strategy session. We'll show you exactly where the growth is hiding.
Fill out the form and we'll get back to you within one business day. Prefer email? Write to us directly at contact@rankite.com.
