Customer concentration: the number that halves your multiple

At a glance

• When one customer is 30% or 40% of revenue, a buyer doesn’t see a great account. He sees the risk of that account leaving, and he prices the whole company for it.
• Concentration works on the multiple, not just the earnings, which is why it can quietly halve what a business is worth even when profit looks strong.
• Reducing concentration before a sale is often worth more than the revenue it costs, because a smaller, more diversified book can carry a higher multiple than a larger, riskier one.

Few things cap a company’s value as hard, or as invisibly, as customer concentration, and few owners price it the way a buyer will. This piece is about why a buyer treats a big customer as a risk rather than a strength, and why spreading revenue before a sale can raise the price even as it lowers the top line.

Why does a buyer fear your biggest customer?

Because he’s buying the future, and your biggest customer is the fastest way that future disappears. If one account is 40% of revenue, then a single relationship, one you may hold personally, controls almost half of what he’s paying for. If it walks in year one, the business he bought is a different, smaller business. He can’t ignore that, so he prices it.

This is the opposite of how owners feel about their anchor accounts. To the owner, the big customer is proof the company is trusted, a source of pride and stability. To the buyer, it’s a concentration of risk with your name on the relationship, and the bigger and more personal it is, the more it worries him.

How does concentration halve a multiple?

It works on the multiple, which is what makes it so expensive. Two companies with identical profit can sell for very different prices if one earns its money from thirty diversified customers and the other from three. The diversified book feels durable, so it earns a fuller multiple. The concentrated book feels fragile, so the buyer applies a discount to the multiple itself, and a lower multiple on the same earnings is a materially lower price.

Here is what a buyer actually weighs:

1. Share of revenue in the top one, three, and five accounts. The higher the share, the steeper the discount.
2. Whose relationship it is. A customer tied to the owner personally is worse than one tied to the company, because it may leave with the owner.
3. How replaceable the customer is. A commodity buyer who could switch tomorrow is priced as more fragile than a deeply embedded one.
4. Contract and switching costs. Long contracts and high switching costs soften the discount; handshake arrangements deepen it.

Each of these can be improved before a sale, and improving them lifts the multiple applied to every dollar of earnings.

Isn’t losing that revenue a step backward?

It feels like one and often isn’t, because value is earnings times a multiple, and diversification raises the multiple. Deliberately capping the anchor account’s share, growing the middle of the book, and moving relationships off the owner and onto the team can lower revenue slightly while raising what the company is worth, because the buyer will pay more for each dollar of a durable, diversified earnings stream than for each dollar of a fragile one.

That’s the counterintuitive move the owners who get their number make: they spend the years before a sale making the revenue base less exciting and more durable, because durable is what a buyer pays a premium for.

Where this leads

Concentration is one of the value levers you can only manage once you can see profit and revenue by customer. It connects to which customer actually makes money, owner-dependence and the relationships you hold personally, and the timing question, when the clock on all of it starts.

The Sellable-Numbers Scan measures your concentration the way a buyer will and dollarizes what reducing it is worth to your price. In 14 days, with a simple guarantee: at least 3x the Scan fee in owner-accepted value identified, or you pay nothing.

If that’s the question in front of you, book a fit call. Thirty minutes, no pitch.

Russell Fette · Decisive Finance · Creator of Financial Rhythms™