Why does Performance Max end up on brand searches?

Performance Max serves on brand searches because nothing stops it by default, and brand searches convert. Google’s prioritization rules say a Search campaign with an exact match keyword that is identical to the query (or spell-corrected to it) is preferred over Performance Max. Phrase match, broad match and Performance Max search themes all share the same lower priority, and when nothing matches exactly, the campaign with the higher Ad Rank serves.

That exact match preference only holds when the keyword is eligible. Google notes that if your Search campaign is budget-limited, Performance Max may occasionally serve on exact match terms. A brand campaign that runs out of budget by mid-afternoon, has disapproved ads, or targets fewer locations hands the rest of the day’s brand queries to Performance Max.

The cost is not mainly wasted money. Brand clicks are often cheap. The cost is a reporting problem: a campaign that blends brand demand with new demand shows a return you cannot attribute, and a bidding system rewarded for conversions keeps finding the easiest ones.

Which guardrails exist, and what does each one block?

Each control covers different inventory, so you need several. This is the set as of October 2026:

Control What it blocks Inventory covered Trap to watch
Exact match brand Search campaign Wins identical brand queries over Performance Max Search Loses priority if budget-limited or ineligible
Brand exclusions (brand lists) Queries tied to a brand, including misspellings and subsidiaries Search, Shopping and YouTube search Optional checkbox keeps Shopping ads on excluded brands
Campaign-level negative keywords and lists Specific queries you name Search and Shopping only Too many negatives can limit reach
Account-level negative keywords Queries across the whole account All Search and Shopping, including Performance Max Also blocks your own brand Search campaign
URL exclusions Landing pages Final URL expansion may choose Pages on your domain Cannot exclude the campaign’s own Final URL
Customer acquisition goal Biases bids toward new customers Campaign bidding Needs customer lists or purchase tracking to work well

Sources for the table: brand exclusion setup, About brand exclusions, Performance Max negative keywords and URL exclusion.

In what order should you set up the guardrails?

Set them up in this order, because each step assumes the one before it:

  1. Fix conversion goals first. Performance Max optimizes toward whatever you call a conversion. If a newsletter signup or a page view is a primary action, no guardrail helps. Our conversion tracking guide covers this.
  2. Give brand its own Search campaign. Use exact match brand keywords and a budget that does not run out. The exact match preference is your first line of defense, and it fails when the campaign is limited by budget.
  3. Create a brand list and apply it as a brand exclusion. In the Performance Max campaign, open Settings, then Additional settings, then Brand exclusions, and choose your list. For many campaigns at once, select them, click Edit, then Change brands. Google’s setup steps cover both paths.
  4. Decide the Shopping checkbox on purpose. “Allow Shopping ads on searches that mention excluded brands” keeps product ads eligible on brand queries. Some retailers want that; others want brand fully isolated. Pick one and write down why.
  5. Add campaign-level negatives. Since Google’s 2025 update, you can add negatives directly to a Performance Max campaign and attach shared negative keyword lists. Use them for queries a brand list cannot express: login, account, customer service, careers, and competitor names you choose not to buy.
  6. Set Final URL expansion and URL exclusions. Final URL expansion is on by default and can send traffic to any page you have not excluded. Exclude support, login, careers and blog sections. Google notes the campaign’s own Final URL cannot be excluded, so if you do not want the homepage to serve, use a more specific Final URL and then exclude the homepage. With expansion off, the campaign only sends people to URLs in your asset groups and page feed.
  7. Bias bidding toward new customers. The customer acquisition goal offers New Customer Value, High Value New Customer and New Customer Only modes in Performance Max. Upload Customer Match lists (Google requires at least 100 active members for lifecycle goals) so Google knows who already buys from you.
  8. Report brand and Performance Max separately. Never judge Performance Max on a blended account number.

Should brand Shopping ads stay on?

Treat it as a test, not a setting. Product ads on a brand query can show price, image and stock in a way a text ad cannot, which may help a shopper choose a product. They can also simply take a sale your brand Search ad would have closed. The only way to know for your account is to run one period with the checkbox on and one with it off, hold everything else steady, and compare total brand-query sales, not campaign-level conversions. If you have the budget, a structured incrementality test gives a cleaner read.

How do you check the guardrails are working?

Check two reports every week. The first is the search terms report for Performance Max: in the Campaigns menu open Search terms, then choose “Search terms and landing pages for Performance Max”. It shows the queries, the landing page each one reached, and whether the ad was a Shopping or text ad. Data starts in March 2023. Google’s announcement describes it as the same granularity you get in Search and Standard Shopping campaigns.

The second is the channel performance report: Campaigns, then Insights and reports, then Channel performance. It splits results across Google Search, Display, YouTube, Discover, Maps, Gmail and Search partners, with impressions, clicks, conversions, conversion value and cost. Any date range after June 6, 2025 is available.

A weekly checklist:

  • Filter the Performance Max search terms for your brand name and common misspellings. Anything converting there is leakage.
  • Check landing pages in the same view. Unexpected pages mean Final URL expansion needs more exclusions.
  • Compare the brand Search campaign’s impression share and budget status. A “limited by budget” flag is an open door.
  • In channel performance, note where spend moved. A sudden shift toward Search after a change deserves a look.
  • Review assets created by text customization and Final URL expansion, which Google now reports and lets you remove.

What do these guardrails not cover?

They are search guardrails. Brand exclusions and Performance Max negatives cover Search and Shopping inventory (brand exclusions add YouTube search). They do not stop Display, Gmail, Discover or other YouTube placements; for those, Google points to excluded content keywords in the Content Suitability center. They also do not stop Performance Max from reaching people who already know you through remarketing signals, which is why the customer acquisition goal and separate reporting matter.

Expect reported Performance Max results to fall after you add guardrails. Google’s own advice is to monitor reach when you add negatives or exclusions, and the negative keywords page lets you preview the predicted impact before saving. A smaller, honest number is the one you can scale against. If your next step is changing how Performance Max bids, read our guide on value-based bidding.

How MSG approaches this

At MSG, brand is reported separately from the start, because branded clicks flatter blended numbers. We fix conversion definitions before scaling, then set up the guardrails in the order above inside your own ad account. Changes like the brand Shopping checkbox are run as tests, each with a written hypothesis, a budget and a decision date, and every read ends in keep, change, scale or stop. We say what the data shows and what it does not. Our Google Ads management and measurement services cover this work.

Sources

  1. Google Ads Help: How Performance Max interacts with other campaigns in your account
  2. Google Ads Help: About Performance Max campaigns
  3. Google Ads Help: Apply brand exclusions to Performance Max or Search campaigns
  4. Google Ads Help: About brand exclusions
  5. Google Ads Help: Negative keywords in Performance Max campaigns
  6. Google Ads Help: Performance Max visibility and control updates (August 2025)
  7. Google Ads Help: About Final URL expansion in Performance Max
  8. Google Ads Help: About URL exclusion in Performance Max
  9. Google Ads Help: About the search terms report in Performance Max
  10. Google Ads Help: About the channel performance report for Performance Max
  11. Google Ads Help: About customer lifecycle goals
  12. Google Ads Help: Activate the new customer acquisition goal
  13. Google Ads blog: Channel performance reporting is coming to Performance Max

Platform features and policies change. This guide reflects the sources above as of October 7, 2026.