Why Customer Concentration Risk Is More Dangerous Than It Looks

One of the most commonly cited risks in private equity deals? Customer concentration.

It shows up clearly in the data that top 5 customers = 40%, 50%, sometimes even 70%+ of revenue.

Naturally, this raises concern. But here’s the reality: The risk isn’t always what it seems, and sometimes, it’s far worse.

The Surface-Level View of Concentration

Most diligence processes assess concentration risk in straightforward ways:

• Revenue percentage by top accounts
• Contract length and renewal timing
• Historical retention rates

If those indicators look stable, teams often move forward with cautious confidence.

But this approach misses a critical layer: what those customers are actually thinking.

What Customer Data Often Reveals

Through customer diligence, a very different picture can emerge.

1. “Concentrated” Doesn’t Always Mean “At Risk”

In some cases, high concentration is paired with:

• Deep integration into customer workflows
• Long-standing operational dependencies
• High switching costs or related friction

Customers may describe the vendor as “mission-critical.”

In these situations, concentration risk is real, but manageable.

2. The Opposite Is Also True

We’ve seen deals where:

• Top accounts represented over 50% of revenue
• Contracts appeared stable
• Historical churn was low

Yet customer interviews revealed:

• Active exploration of alternative vendors
• Frustration with pricing or service
• Internal pressure to diversify suppliers

On paper: stable. In reality: already eroding.

The Hidden Variables That Matter Most

Customer concentration risk isn’t just about percentages.

It’s about dynamics like:

• Decision-maker changes inside key accounts
• Budget pressure that triggers re-bidding
• Competitive encroachment that starts quietly
• Perceived differentiation (or lack of it)

These factors rarely show up in financial models, but they drive outcomes.

Why Traditional Diligence Misses It

Most traditional approaches rely on:

• Management-selected references
• Limited customer calls
• Assumptions based on contract structure

The problem? Customers rarely reveal real concerns in those settings.

It takes:

• Independent outreach
• Skilled interviewers
• Proper positioning

…to uncover what’s actually happening beneath the surface.

From Risk to Opportunity

When properly understood, concentration can also become an advantage.

Customer diligence can uncover:

• Expansion opportunities within key accounts
• Upsell or cross-sell potential
• Pathways to deepen relationships post-close

In other words:

The same accounts that represent risk can also represent the fastest path to growth when you understand them deeply.

Customer concentration isn’t just a number.

It’s a story, and that story can only be told by the customers themselves.

Firms that rely on surface-level metrics risk mispricing deals.

Firms that go deeper gain clarity on which revenue is truly durable, which relationships are at risk, and where the real opportunities lie.

If you’re evaluating a deal with meaningful concentration, it’s worth asking: do you actually know how those customers feel?