Concentration Risk: When One Customer Is Too Much of a Good Thing

Landing a major customer is a milestone most owners celebrate. The revenue is significant, and the relationship is strong. Then, a few years in, you look up and realize that one account now represents 35 percent of your total revenue. Maybe 40. That is customer concentration, and it shapes how a buyer will value your business long before you ever put it on the market.

From an operational standpoint, concentration like that can feel like success. From a buyer’s standpoint, it is a red flag.

How Buyers Think About Customer Concentration

Buyers are buying future cash flows. Anything that puts those cash flows at risk affects the price they are willing to pay and the terms they will require. Customer concentration is near the top of that risk list.

The threshold that tends to draw the most scrutiny is when a single customer accounts for more than 20 percent of revenue. At that level, the departure of that one relationship could materially impair the business. Buyers will ask hard questions about contract terms, relationship history, and what happens if that customer decides to go elsewhere or gets acquired by a competitor.

Above 30 percent, the conversation changes significantly. Some buyers will walk away entirely. Others will restructure the deal to shift risk back to the seller through earnouts or escrow arrangements tied to that customer’s continued revenue.

The Valuation Impact Is Real

Concentration risk does not just affect whether a deal gets done. It affects the terms. A business with well-diversified revenue and strong customer retention will command a higher multiple than a comparable business where a significant portion of revenue is tied to one or two relationships.

The math is straightforward. If a buyer applies a discount to the revenue tied to a concentrated customer because of the risk of loss, that discount flows directly through to the purchase price. A half-turn reduction in multiple on a business earning two million dollars in EBITDA is a million dollars off the table.

What You Can Do About It

The honest answer is that diversifying a customer base takes time, and it does not happen by accident. If you have a concentration issue today and a sale is somewhere in your future, the time to start is now.

That means intentionally investing in sales and marketing for new accounts, even when the existing relationship is comfortable and profitable. It means not turning down smaller customers because the big one keeps you busy. And it means being honest with yourself about the risk you are carrying if that anchor relationship ever changed.

Some owners have also had success using the period before a sale to formalize their largest customer relationships with longer-term contracts. A customer who has been buying from you for ten years on a handshake may be willing to sign a multi-year agreement, especially if you frame it as a mutual interest in continuity. That contract does not eliminate concentration risk, but it gives a buyer something concrete to model.

When Concentration Is Just the Reality

Some businesses are structurally concentrated by nature. A specialty manufacturer with two major OEM customers. A service firm with a dominant regional account. In those cases, the goal is not to pretend the concentration does not exist but to manage the narrative around it.

That means being able to demonstrate the depth of the relationship, its history, the switching costs that make departure unlikely, and what mechanisms are in place to protect continuity. A long, well-documented relationship with a stable customer is a very different risk profile than a newer relationship with no contract and no track record.

Buyers do not expect perfection. They expect honesty and preparation. Owners who understand their concentration risk and can speak to it clearly are in a much stronger position than those who hope the buyer does not notice.

Wondering how a buyer would look at your customer base? Our team at Exit Advantage℠ can help you see it the way they will. Reach out for a confidential conversation.

Steven Pappas, M&A MI
Partner, Managing Director
Touchstone Advisors
860-669-2246
spappas@touchstoneadvisors.com