Most B2B businesses have an ICP. Some have it written down. Very few have actually used it to make commercial decisions .

The typical ICP document is a demographic profile: company size 50–500, industries X, Y and Z, geography UK and US, decision-maker is the CMO or Head of Marketing. It describes a category of business, not a type of customer worth pursuing.

This is a problem because a demographic ICP doesn't tell you anything actionable. It doesn't tell you which of the 5,000 businesses in that profile you should actually target, how to prioritise your marketing spend, what to say to them, or how to structure your pipeline. It's a description, not a strategy.

What a commercial ICP actually is

A commercial ICP answers a different question: who do you want more of, and why?

Not who could theoretically benefit from your product. Not who falls within the demographic parameters you've defined. But which customers, based on actual performance data, are worth prioritising because they represent the highest commercial return for the effort invested.

The right customers are usually those who:

  • Close fastest (shortest sales cycle)
  • Pay most (highest ACV or LTV)
  • Stay longest (lowest churn, highest expansion)
  • Need least support post-sale (lowest cost to serve)
  • Refer others and act as advocates

Very often, these criteria point to a much more specific and probably more niche segment than the broad demographic profile most businesses start with.

"The ICP is not a description of who might buy. It's a decision about who you should prioritise, based on who's already your best customer."

How to build a real ICP: the closed deals method

The most reliable way to define your ICP is to start with your existing customers. Pull your closed-won deals from the last 12–24 months. For each, record:

  • Time to close (from first contact to signed contract)
  • Contract value (ACV)
  • Current status (active, churned, expanded)
  • Company characteristics: size, industry, growth stage, tech stack, structure
  • Champion characteristics: seniority, function, triggers that drove them to reach out
  • How they found you (channel, content, referral)

Sort by a composite score that weights the factors you care most about. For most businesses, this is some combination of ACV, time to close, and retention. Your top quartile of customers is your ICP.

Now look at what those customers have in common. Not just demographics, but commercial context: Were they at a particular growth stage? Had they recently raised funding or made an acquisition? Were they dealing with a specific trigger event: a new CMO, a failed agency relationship, a board mandate to reduce CAC?

This is your commercial ICP. It's specific enough to inform targeting, messaging, and channel decisions.

Using the ICP to make decisions

Once you have a commercial ICP, it should inform almost every marketing decision you make.

Channel selection. Where do your ICP accounts spend time? Where do their decision-makers go for information, community, and trusted content? This determines which channels are worth investing in. If your ICP is largely in financial services, that might mean LinkedIn , trade press, and industry events rather than broad content marketing.

Content strategy. What problems is your ICP trying to solve? What questions do they have at each stage of the buying journey? Your content strategy should be built around answering those specific questions, not producing general "thought leadership" for an undefined audience.

Outbound targeting. If you're running outbound or ABM campaigns, the ICP defines your target account list. Not "all companies of this size in this industry" but "companies that match the commercial profile of our best customers, with identifiable trigger events that suggest they're in a buying moment."

Lead qualification. When a lead comes in, your ICP should be the first filter. Is this company and contact a match? If not, what's the right next step? Having a clear ICP makes qualification faster and reduces time wasted on opportunities that were never going to close.

The discomfort of specificity

The reason most businesses keep their ICPs deliberately vague is that specificity feels risky. If you define your ICP tightly, you might miss opportunities outside it.

This is a false trade-off. A tight ICP doesn't mean you refuse to work with anyone outside it. It means you allocate your marketing investment primarily towards the segment where you have the highest probability of success. You still take good opportunities outside the ICP when they arise. You just don't build your entire marketing programme around chasing them.

The businesses that have the most predictable, scalable pipeline are almost always the ones with the clearest ICPs. They know who they're after, where to find them, what to say, and what success looks like. Everything follows from that clarity.