Is Performance Max cannibalizing Search on your brand terms?

Last checked against Google’s documentation on 29 September 2026.

Is Performance Max cannibalizing Search? The short answer

Performance Max cannibalizing Search usually means one thing: Performance Max is serving on searches for your own brand that a brand Search campaign would have caught more cheaply and with ads you wrote. It happens when the Search campaign isn’t eligible, doesn’t have an identical exact match keyword, or loses on Ad Rank for a variant of the brand.

The fix is not to turn Performance Max off. Make sure the brand Search campaign has exact match keywords and enough budget to serve, then add a brand exclusion to Performance Max if you want it to stay off brand searches entirely. Check the Performance Max search terms report first so you know how big the overlap really is.

Does PMax take priority over Search?

Google publishes the rules it uses to choose which keyword or search theme enters the auction when more than one in your account could match. From Google’s keyword and search theme prioritization page, in order:

1. Identical exact match keywords win. If the search is identical to an exact match keyword in an eligible Search campaign, that keyword is prioritized over any broad or phrase keyword and over Performance Max. Google counts spelling-corrected searches as identical, but not plurals or synonyms.
2. Identical phrase, broad and search themes share priority. If the search is identical to a phrase or broad keyword, or to a Performance Max search theme, those are preferred over non-identical matches. Google says search themes behave like phrase or broad keywords here.
3. Then relevance. If nothing is identical, Google uses AI to judge which ad group or asset group is most relevant to the search.
4. Then Ad Rank. Between equally eligible options, the one with the higher Ad Rank is chosen.

Google’s example: for the search “skydiving license”, an exact keyword [skydiving license] in a Search campaign wins over Performance Max; without it, a Performance Max search theme “skydiving license” wins over a phrase keyword “skydiving”. Google’s page on how Performance Max interacts with other campaigns says the same thing from the other side: a Search campaign with a keyword that exactly matches, or is spelling-corrected to, the search is preferred over Performance Max.

So the short answer to “does PMax take priority over Search?” is no, not for identical exact match. For everything else, Performance Max competes on relevance and Ad Rank like any other option in your account.

Why PMax ends up on your brand searches

The rules above only apply when the Search keyword can actually serve. Google lists the things that stop it:

• Budget. Google says your daily budget can affect whether the preferences are applied. A brand Search campaign that runs out of budget early leaves the rest of the day to Performance Max.
• Targeting and schedule. If the brand campaign excludes a location, audience or time of day that Performance Max covers, Performance Max can serve there.
• Disapproved ads or landing pages. A keyword with no approved ad can’t serve.
• Low search volume status. A keyword marked as low search volume is temporarily inactive.
• Variants you don’t cover. Brand plus a product word, brand plus “reviews”, or brand plus a location is not identical to [brand]. Those go to relevance and Ad Rank, where Performance Max can win.

How to check for Search vs PMax overlap

Before changing anything, measure it.

1. Open the Performance Max search terms. Click Campaigns, open Insights and reports, click Search terms, and switch the view to Search terms and landing pages for Performance Max. Google’s Performance Max search terms report covers this.
2. Filter for your brand name and its common misspellings. Add up cost, clicks and conversions from those rows over the last 30 to 90 days.
3. Work out the share. Divide brand conversions by the campaign’s total conversions. If a large share of what Performance Max reports is brand, its results say less about how well it finds new customers.
4. Check the brand Search campaign. Look at search impression share and search lost impression share (budget). Lost to budget on a brand campaign is the most common gap. The difference between budget and rank losses is covered in lost impression share: budget vs rank.
5. Check the brand keywords. Confirm there is an exact match keyword for the brand name, that it is eligible, and that its ads are approved.
6. Compare settings. Locations, schedule and audiences on the brand campaign versus Performance Max. Gaps in one are open ground for the other.

How to stop PMax stealing brand traffic

Work from the least disruptive fix to the most:

1. Add exact match brand keywords to the brand Search campaign, including the brand name with and without spaces or hyphens if people search both ways.
2. Remove the budget limit on the brand campaign. Look at what the campaign spends on a day it doesn’t hit the limit; that is roughly the budget it needs to stay eligible all day.
3. Match the targeting. If Performance Max serves in locations or hours the brand campaign doesn’t, widen the brand campaign or accept that Performance Max covers those.
4. Fix disapprovals on brand ads and landing pages.
5. Add a brand exclusion to Performance Max if you want it off brand searches regardless of what the Search campaign does.

You can also use negative keywords, but for brand terms Google’s Performance Max FAQ points to brand exclusions instead, because they also block clear misspellings and searches in other scripts. Negatives are better for non-brand waste; see Performance Max negative keywords.

Setting up PMax brand exclusions

Brand exclusions use a brand list rather than typed keywords. Google’s brand exclusions overview names your own brand and competitors’ brands as uses for them. To apply one to an existing Performance Max campaign:

1. Click Campaigns and open the Settings tab.
2. Select the Performance Max campaign and go to Additional settings.
3. Click Brand exclusions, select an existing brand list or click + New brand list, and save.

For Performance Max, Google says brand exclusions apply to Search, Shopping and YouTube search inventory. There is a checkbox to allow Shopping ads on searches that mention excluded brands. An online store that wants its product listings to keep appearing on brand searches, while stopping text ads there, can use it.

Should you exclude your brand from PMax at all?

It depends on what you want Performance Max to do:

• Exclude when you want its reported results to show prospecting value, when you want brand ad copy under your control in Search, or when brand clicks cost more through Performance Max than through Search.
• Keep brand in when you don’t run a brand Search campaign, or when brand volume is small and you’d rather let one campaign handle everything.

Google’s FAQ notes that excluding brand helps you get a clearer view of a campaign’s true prospecting potential. Expect Performance Max’s conversion count to fall after you exclude brand. That is the brand conversions moving to the Search campaign, not a loss, so judge the change on total conversions across both campaigns, not on Performance Max alone. Give it at least two to three weeks before comparing.

A 20-minute overlap check

1. Pull the Performance Max search terms for the last 30 to 90 days and filter for brand.
2. Work out brand’s share of Performance Max conversions.
3. Check the brand Search campaign’s impression share lost to budget.
4. Confirm an eligible exact match brand keyword with approved ads.
5. Compare locations, schedule and audiences between the two campaigns.
6. Decide on a brand exclusion, and whether Shopping stays on brand searches.
7. After the change, compare total conversions across both campaigns.

Boxoo’s performance and structure agent checks how your Performance Max and Search campaigns overlap on every review. When Performance Max is spending on brand searches, it files a case with the search terms, cost and conversions behind it, and the steps to add a brand exclusion or tighten the brand campaign. Settings the API can’t change are handed to you as exact steps; nothing in the account changes until you act. Run a free Google Ads audit to see it on your account.