Introduction
Marketplace advertising often feels like pouring money into a black box: budgets vanish, CPCs rise, and conversions stagnate. But the problem isn’t always competition — it’s campaign structure.
This is where Search Term Isolation (STI) changes the game. STI is a tactic that can double your conversions by giving you control, reducing wasted spend, and sharpening your strategy.
Search Term Isolation (STI) is the process of moving your top-performing search terms into dedicated exact match campaigns, while excluding them from auto, broad, and phrase campaigns.
Why it works:
Full control over when and how terms trigger
No duplicate bidding or wasted budget
Sends stronger signals to marketplace algorithms
Ensures top keywords always get the highest share of spend
Most advertisers still rely on a layered campaign structure. While this approach seems logical, it actually causes inefficiency and wasted budget.
A typical setup looks like this:
Auto campaigns → discovery
Broad or phrase campaigns → scaling
Exact match → often neglected
The problem with this approach:
The same keyword fires across multiple campaigns
You end up bidding against yourself
High-intent keywords don’t receive focused budget
Reporting becomes cluttered and hard to optimize
The real power of STI lies in how it reallocates your budget and focuses spend on what works. By filtering noise and pushing high-intent keywords into their own campaigns, advertisers can scale profitably.
Benefits include:
Better budget allocation → high-intent terms get more spend
Higher conversion rates → exact match removes irrelevant clicks
Lower CPCs → no internal bidding wars
Improved ranking → platforms reward clean conversion data
Story Example:
Imagine spending €5,000/month across auto and broad campaigns, only to discover that 70% of your sales come from just 20 keywords. STI ensures those 20 keywords get the spotlight — while wasted impressions disappear.
Implementing STI doesn’t require complex tools — it requires discipline and structure. Here’s a step-by-step playbook to get started:
Auto Campaign → keyword discovery
Broad/Phrase Campaign → broader targeting
Exact Match Campaign → precision control
Identify keywords with 2+ conversions
Track ROAS-positive search terms consistently
Move them into exact match campaigns
Set bids tailored to profitability and margins
Add the same terms as negatives in auto/broad campaigns
Ensures they only trigger where you want them
Not all marketplaces are created equal when it comes to keyword control. Some offer robust search term reporting, while others require third-party tools to implement STI effectively.
Best platforms for STI:
Amazon → Search Term Reports + Negative Match functions make STI highly effective
Otto → Manual keyword campaigns allow segmented targeting
Kaufland → Tools like Adspret or BidX support STI logic
⚠️ Note: Not all platforms provide full match control. In those cases, adapt using product targeting or campaign clusters.
Once STI is in place, the challenge becomes scaling without losing efficiency. These best practices will help you maintain performance as budgets grow:
Use dynamic bidding in exact campaigns (down only)
Review performance weekly, not monthly
Segment by product type or ACoS goal (high vs. low margin)
Gradually shift budget from discovery to exact
Combine with product targeting ads to defend listings
Search Term Isolation isn’t just a tactic — it’s a shift in mindset.
It’s the difference between running ads and running smart ads.
By isolating your best keywords, you stop wasting budget, double down on what works, and unlock scalable growth.
