If you try to speak to everyone, you speak to no one. It sounds like a cliché, but it's one of the most expensive mistakes in B2B marketing. Market segmentation isn't about avoiding risk. It's about allocating resources effectively. The more precise your ICP (Ideal Customer Profile), the better Sales converts, the more efficient Marketing becomes, and the more focused Product can be.
TAM / SAM / SOM: What these concepts actually mean
Total Addressable Market: The theoretical total market
All potential customers worldwide for this product category. Relevant for investor pitches and strategic decisions, but not an actionable framework for Sales.
Serviceable Addressable Market: The market you can actually serve
Customers you can realistically reach with your product, language capabilities, and sales infrastructure, after applying geographic, linguistic, and regulatory filters.
Serviceable Obtainable Market: The market you can realistically win
What you can realistically capture over the next 3–5 years given your resources, competition, and market dynamics. This is the number that should drive your planning.
What an ICP is, and what it isn't
An ICP isn't a wish list or a description of your average customer. It's the profile of the customer who buys fastest, pays the most, churns the least, and recommends you most often. When defining your ICP, ask: Who are our 20 best customers, and what do they have in common?
The 6 dimensions of a B2B ICP
Firmographics
Company size, revenue, number of employees, industry, geography, and growth stage.
Technographics
What systems do they use? ERP, CRM, legacy systems? Is integration a blocker or an enabler?
Pain points
What specific problems does this type of customer have that your product solves? How urgent are they?
Decision structure
Who buys? Is the decision bottom-up, driven by users, or top-down, driven by management? How many people are involved in the buying center?
Budget readiness
Does this type of customer already have an active budget for this category? Or does the budget first need to be fought for internally?
Time to value
How quickly can they get value from the product? The shorter the time to value, the stronger the ICP fit.
From segments to priorities: The segmentation matrix
| Segment | Market size | Accessibility | Product fit | Priority |
|---|---|---|---|---|
| Large hospitals in DACH | Large | Medium (long sales cycles) | High | Tier 1 |
| Mid-sized hospitals | Medium | High (direct sales) | High | Tier 1 |
| Medical practices / outpatient medical centers | Large | High | Medium | Tier 2 |
| International markets outside DACH | Very large | Low (regulatory barriers) | Medium | Tier 3 |
“The ICP isn't a limitation. It's a form of freedom. When you know who you don't need to target, you can focus completely on the customers you can win.”
Common segmentation mistakes
- Defining the ICP based on intuition instead of data: “Our product is suitable for everyone.” A typical result when nobody has analyzed the company's best existing customers.
- Too many ICPs: If everything is a priority, nothing is. One primary ICP, with no more than one secondary ICP.
- Never updating the ICP: What was true two years ago may no longer be true today. Markets and products evolve.
- Confusing TAM with SOM: Presenting a TAM number to the board as a sales target is a red flag.
Market segmentation isn't a theoretical exercise. It's the foundation for every commercial decision. Which trade shows should we attend? Which regions should we expand into first? Which case studies should we feature on the website? Without an ICP, you answer all of these questions based on gut instinct. With one, you answer them with data.
Published June 2026