Market segmentation is the act of dividing a large market into smaller, more homogenous groups in which each group has similar needs, behaviors, and decision criteria. It is one of the most powerful tools in B2B strategy -- and one of the most frequently skipped in favor of "we serve any B2B company."
A company that has not done segmentation is trying to be relevant to everyone, which means it is resonant with no one. The go-to-market motion that works is one built on a deliberate choice: here is the specific segment we can serve best, and here is why.
Step 1: Define the segmentation dimensions
Segmentation can be done along many dimensions. The right dimensions are the ones that predict buying behavior in your specific market.
The four segmentation dimensions for B2B:
Step 2: Generate and test segment hypotheses
Segmentation is a hypothesis-driven exercise. Start with hypotheses based on what you already know, then test them against data.
How to generate segment hypotheses:
- Analyze your best customers: Pull the top 20 accounts by LTV (or win rate, or time-to-value). What do they have in common? What patterns emerge across firmographic, technographic, and behavioral dimensions?
- Analyze your worst customers: Pull the accounts with the highest churn rate, the longest time-to-value, or the most support tickets. What do they have in common? What patterns distinguish them from your best customers?
- Analyze your win/loss data: Which segments are you winning in? Which are you losing in? Are there segments you're entering and consistently losing that you should stop targeting?
Step 3: Size each segment
A segment that has perfect fit but no volume is not a viable primary segment. Size each viable segment before choosing your focus.
How to size a B2B segment:
TAM is not your revenue opportunity -- it is the theoretical maximum if you captured every company in the segment. Your realistic serviceable obtainable market (SOM) is typically 2-5% of TAM in year one.
What segment size tells you:
- A segment with less than $50M TAM is too small to be a primary focus for most B2B companies
- A segment with over $500M TAM may be too broad to pursue as a single segment -- consider sub-segmentation
- The right primary segment is one where TAM is large enough to fund growth but specific enough to be winnable
Step 4: Choose the primary segment and the expansion path
Segmentation produces a prioritized list. The output is not which segments exist -- it is which one to focus on first and in what order to expand.
The segment priority decision:
Step 5: Translate segmentation into go-to-market decisions
Segmentation is only useful if it changes what the team does. Translate the segment decision into specific go-to-market changes.
Market segmentation completion checklist
The purpose of segmentation is not to know where all the customers are. It is to decide where to concentrate your go-to-market motion so it is powerful enough to be noticed.
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