What Is an ICP? How to Build an Ideal Customer Profile

An ICP (ideal customer profile) describes the company that benefits most from your product, buys fastest and stays a customer longest. It is made up of attributes such as industry, company size, region, technologies used and the situation the company is in.

The ICP is the starting point for everything in B2B sales. It determines who you reach, what you say and how much time you give each opportunity. With a poorly defined ICP, even the best message and the best sales team work inefficiently.

ICP vs persona

	ICP	Persona
Level	Company	Person
Question it answers	Which companies should we sell to?	Who should we talk to in this company?
Example attributes	Industry, headcount, country, growth stage	Job title, responsibilities, goals, problems

The two work together: the ICP gives you the right list of companies, and personas give you the right people inside them and the message to send.

Why the ICP matters so much

Higher reply rates: when your message reaches companies that genuinely have the problem, interest rises naturally.
Shorter sales cycles: good-fit companies decide faster.
Less wasted time: the sales team doesn't spend time with companies that will never buy.
Better customers: customers who match the ICP use the product more and stay longer.

How to define your ICP, step by step

1. List your best customers

Pick your most valuable current customers. "Best" doesn't just mean highest-paying, but those who use the product actively, are happy, bought easily and have been with you longest. Five to ten companies is a good number.

2. Find what they have in common

Put these companies side by side and look for common ground:

Firmographics: industry, headcount, revenue band, headquarters country and city.
Technographics: which software do they use? A particular CRM or infrastructure?
Situational attributes: what was happening when they bought? Had they raised funding, were they hiring fast, were they entering a new market?

Situational attributes are the most overlooked but often the strongest signals. Understanding why a company bought "now" lets you reach others at the right moment.

3. Look at lost deals and churned customers too

Lost opportunities and customers who left are also valuable for your ICP. Which kinds of companies didn't buy, or left quickly? This shows who to keep outside your ICP.

4. Identify who makes the buying decision

For each ICP company, map the roles involved in buying: who decides, who influences, who uses the product? This is the basis of your personas and target job title list.

5. Make the ICP written and measurable

The ICP should be clear enough that everyone on the team reads it the same way and can use it as a filter when building a list. "Growing tech companies" is not an ICP; "UK-based B2B SaaS companies with 50 to 200 employees that have raised funding in the last 18 months" is.

6. Test and narrow

Your ICP is a hypothesis until real market response confirms it. Outbound campaigns are one of the best tools for quickly seeing how different segments respond. Measure which segment replies and which turns into qualified opportunities, and narrow the ICP accordingly.

An example ICP

For a hypothetical software company building a call analytics tool for sales teams, the UK ICP might look like this:

Industry: B2B SaaS and technology services
Size: 50 to 250 employees, sales team of 8 to 40
Region: UK, primarily London and Manchester
Technology: uses HubSpot or Salesforce, sells over video calls
Situation: raised funding in the last year or is hiring to grow the sales team
Decision makers: VP Sales, Revenue Operations lead
Exclude: companies under 20 employees, fully self-serve products

This definition is clear enough both to build a target list and to shape the message.

Adapting your ICP to a new market

A common mistake when expanding abroad is copying the home-market ICP as is. The same product can appeal to different company types and job titles in different markets. Ask these questions again for the new market:

Which industries and company sizes feel this problem most acutely in this market?
Which role makes the buying decision? A decision made by the managing director at home may belong to a department head here.
Which competing products are common in this market, and which gap do you fill?

We cover market selection and adaptation in detail in how to take a SaaS company international. Turning the ICP into a verified target list is something we do together in our list building and go-to-market strategy services.

Frequently asked questions

What is the difference between an ICP and a persona?

An ICP works at company level: which industry, size, region and situation benefits most from your product. A persona works at person level: who inside that company buys, who uses the product, whose problem you solve. You use the ICP to find the right companies first, then personas to find the right people.

How does a new company define its ICP without customers?

Without customer data, an ICP is a hypothesis. Start from the problem your product solves, estimate the type of company that feels it most acutely, try a few segments with small outreach tests and narrow the ICP based on the responses.

How often should the ICP be updated?

Reviewing it at least every quarter is good practice. Update it straight away when entering a new market, when the product gains a major feature, or when you see a clear pattern in won and lost deals.

Can a company have more than one ICP?

Yes, especially when the product serves different industries. But focusing on too many ICPs at once dilutes the message in outbound. Starting with one, at most two, gives clearer results.

Related guides

This guide is for general information. If you'd like to talk through a plan for your target market, book a free 30-minute strategy call.

What is an ICP (ideal customer profile) and how do you define one?