Self-Serve Negative Keywords in Microsoft Performance Max: How to Use Them

Why self-serve negative keywords matter in Microsoft PMax

Microsoft Advertising Performance Max (PMax) is an AI-driven, asset-based campaign type built to drive conversions across multiple Microsoft surfaces from a single campaign structure. It combines your creative assets with audience signals including first-party customer lists and remarketing to guide delivery toward users who are most likely to convert, while still allowing the system to expand beyond those inputs when it predicts incremental performance. PMax also participates in Search and Shopping auctions, which makes query governance a meaningful lever for efficiency. Microsoft: Performance Max overview

This design matters because PMax is not only about capturing demand at the exact moment of a query. It can also sustain exposure to high-intent users as they continue researching. That broader reach can improve overall efficiency, but it increases the importance of guardrails. If you cannot exclude clearly irrelevant intents, automation can allocate spend to query patterns that are technically eligible but commercially unproductive.

What targeting signals you can use in PMax

Unlike traditional Search, PMax is not built around keyword targeting. Instead, you shape delivery through a combination of inputs that guide the system’s learning and eligibility:

• Audience signals: first-party lists and remarketing are commonly used to anchor the system around users with demonstrated value. Microsoft: PMax audience signals
• Search themes and intent guidance: Microsoft positions PMax as participating in search demand, with advertiser-provided signals helping the system interpret what the business cares about. Microsoft: PMax updates (January 2026)
• URL and landing page selection logic: PMax uses landing pages and assets to match queries and contexts to your offer. When the system has too much freedom and starts matching to low-value intent, exclusions become an important control layer. Microsoft Help: Page feeds and URL options

These signals accelerate learning and improve relevance, but they do not replace query-level governance. Negative keywords remain the most direct way to prevent spend from drifting into intent clusters that do not support your business outcomes.

What changed with self-serve negatives for PMax

Microsoft announced self-serve negative keywords for PMax in open beta. The operational implication is straightforward: advertisers can now apply negative keywords directly through the interface, without relying on indirect workarounds or support-mediated changes. Microsoft: February 2026 product news

There are two related control layers worth separating:

• Account-level negative keyword lists can act as an always-on baseline across campaign types, including Search, Shopping, and PMax. Microsoft Help: Negative keyword lists
• Campaign-level negative keyword management for PMax becomes materially easier when it is self-serve, because exclusions can be tailored to each PMax campaign’s role and discovery goals. Microsoft Help: Add negative keywords

In the Microsoft Advertising UI, negative keyword controls are available under the campaign workflow. Microsoft describes the path as Campaigns, then Negative keywords. Microsoft: self-serve negatives announcement

From an operating perspective, the value is repeatability. Teams can monitor search term insights, identify waste, and apply exclusions quickly, with clearer ownership and fewer dependencies.

How PMax interacts with Search and why negatives matter

Microsoft is explicit about how PMax and Search coexist. Exact match keywords in Search campaigns are prioritized over Performance Max campaigns. Outside of that exact-match rule, there is no hard prioritization, and the best-ranked ad can enter the auction. Microsoft: PMax and Search prioritization

This interaction has two implications for account design. First, exact match remains the strongest tool for protecting critical queries where you need strict control over messaging, landing pages, and reporting. Second, negative keywords become the safety mechanism that prevents PMax from expanding into query categories you do not want it to own, especially when you use PMax to scale beyond the core demand you already capture in Search.

A practical operating model

A disciplined structure typically looks like this: protect high-priority terms in Search with exact match coverage, let PMax expand reach and discover incremental demand, and use negative keywords to exclude irrelevant intents, low-value informational patterns, and edge cases that distort performance. Self-serve negative keywords make that governance loop faster, clearer, and easier to maintain. For many teams, that is the difference between automation that scales and automation that drifts.