PMax brand exclusions: setup, step by step.

If we could make one change to every Performance Max account on earth, it would be this one. PMax, left to its own devices, serves against searches for your own brand name — the cheapest, highest-converting traffic you have — and reports the results as campaign performance. The campaign looks exceptional. The spend is buying almost nothing, because brand searchers were coming anyway. Excluding brand takes about twenty minutes and is the fastest route to an honest read on what PMax actually contributes.

Why this happens by design

PMax bids toward the target you set. Brand searches convert at multiples of non-brand rates and cost a fraction as much, so any value-maximizing system takes them first — it is the rational move given the instruction. Google is not hiding this; the controls exist. But the default is inclusion, and defaults win in accounts nobody audits. The result we see repeatedly: a PMax campaign reporting 8-12x ROAS that drops to 2-3x once brand is removed. The second number is the real one, and it is the only number you can make budget decisions with.

The setup, in order

1. Create a brand list. In Google Ads, under the shared library, define your brand entity — Google matches against known brands, so if yours is not listed, request it. Include common misspellings and the no-space variant of multi-word names.
2. Attach the brand list as an exclusion in each PMax campaign's settings. This is the primary mechanism: it blocks brand-adjacent queries on Search and Shopping inventory using Google's own brand matching, which catches variants a keyword list misses.
3. Add campaign-level negative keywords as the backstop. PMax supports negative keywords at the campaign level; add your brand terms and close variants there too. Belt and braces — the brand list handles fuzzy matching, the negatives handle the terms you know exactly.
4. Check your Search campaigns. If a dedicated brand Search campaign exists (it should — you want brand traffic, just priced and reported honestly), confirm it is capturing the traffic PMax now releases.
5. Annotate the change date. Everything in the account shifts when brand moves between campaigns, and in three months nobody will remember why the trend line bends.

How to verify it worked

Do not trust the setting; verify the behavior. Watch your brand Search campaign impressions in the week after — they should rise as PMax stops competing for the same queries. Watch PMax spend redistribute toward Shopping and non-brand Search. And expect the campaign's reported ROAS to fall. That fall is not damage. It is the removal of a subsidy, and the number you are left with is the number that was always true.

When brand inclusion is defensible

Two honest exceptions. Competitor pressure: if rivals bid aggressively on your brand and your dedicated brand campaign is not defending well, letting PMax also compete can be part of the defense — deliberately, and measured. And genuinely unknown brands: if nobody searches your name yet, exclusion changes nothing and can wait until it does matter. For everyone else, the exclusion should be standing policy, reviewed whenever new brands, product names, or acquisitions enter the account.

This piece is part of our PMax series — the plain-English overview covers when to run the campaign type at all, and the brand vs non-brand measurement piece covers why this split matters everywhere, not just in PMax.