Customer concentration: how buyers price it in a Carolinas deal

Picture two Charlotte-region suppliers with the same earnings. One sends 35 percent of its revenue to a single customer; the other's largest account is 15 percent. Every buyer in the market will price them differently, but not in the same way or for the same reasons, and the owner of the first company has more control over the size of that discount than the percentage suggests.

One number, three kinds of discount

A concentrated customer list rarely produces a single, visible markdown. Buyers spread the discount across three places at once.

The multiple. The simplest response is to pay fewer turns of EBITDA, because the earnings carry a risk the buyer cannot diversify away in year one.

The structure. More commonly, some of the price moves out of cash at closing and into something contingent: an earnout tied to that customer's revenue, a larger escrow, a longer escrow period, or a seller note.

The diligence. The buyer will want to speak with the customer, usually after a letter of intent and often with the seller on the call, and will read the contract, the order history, and anything that shows how the customer chose you in the first place. Our FAQ on how concentration reduces a valuation covers the thresholds that draw attention.

How each buyer type sees it

Strategic acquirers sometimes already know the customer, or sell to it themselves, which can make the concentration less frightening. It can also make them a competitor you would rather not show your customer list to, so strategic interest raises the confidentiality stakes.

Private equity models the downside: what the business looks like if that account shrinks by half. Funds are comfortable using earnouts and rolled equity to share that risk with the seller, and the price they offer depends heavily on how durable the relationship looks on paper.

Individual buyers using SBA financing face the tightest constraints, and they changed on October 1, 2026. The SBA's updated procedures, SOP 50 10 8.1, prohibit seller earnouts in change-of-ownership loans and require the lender's quality-of-earnings report to assess customer concentration and the likelihood that revenue holds after the sale. The lender sizes the loan from that report. With an earnout off the table, an SBA-financed buyer can only answer concentration with a lower price, more equity, or seller financing, and seller debt counts toward the buyer's required equity only if it sits on full standby, with no payments at all during the loan term.

Why one 35 percent customer differs from another

The percentage starts the conversation. These factors finish it:

• Tenure. A relationship that has survived two recessions and a change of purchasing staff is a different risk from one won last year on price.
• Switching cost. Parts qualified through the customer's own approval process, tooling built for them, or first-article history on file make leaving expensive for the customer.
• Commitment on paper. A long-term agreement with volume terms, compared with purchase orders released against a forecast. Our FAQ on purchase orders versus contracts covers how buyers read each.
• Depth of contact. Three or four people at the customer who know your team by name, rather than one buyer who knows the owner.
• Your share of their spend. Being their only source is protective. Being one of four interchangeable sources is not.
• Their own outlook. The customer's program life, market position, and financial health set a ceiling on yours.

What concentration looks like in this region

The pattern differs by sector, and buyers here know it. Motorsports and automotive suppliers in Mooresville and Concord often sell to a short list of teams or tier-one customers, and their demand can move with rule and program changes the supplier does not control. Aerospace shops in Union County carry program concentration that buyers model against each platform's remaining life, as our FAQ on single-program revenue describes. York County plastics and component makers frequently feed a single assembly operation. And some Gaston County textile specialists still carry one legacy customer whose volume has been drifting down for years. Each story calls for different evidence, and our automotive and motorsports supplier page covers how buyers separate program revenue from development work.

Building the evidence file, 12 to 24 months out

Concentration itself takes years to change, but the evidence that makes it tolerable can be assembled far faster.

• Order history by part number for at least five years, showing continuity through downturns.
• Qualification and approval records, including any sole-source designations.
• Supplier scorecards and delivery and quality metrics the customer has shared with you.
• A relationship map naming every contact on both sides, with a second contact added at each major account before the process begins.
• Contract terms summarized honestly, including price-down clauses and termination notice.
• A customer-level margin report, because a concentrated account at a strong margin is a very different conversation from one at a thin margin.

When the percentage itself should move

Real diversification is worth pursuing if there are two or more years before a sale, but not at any price. Buying new revenue with below-cost pricing lowers earnings, and lower earnings cost more than the concentration discount they were meant to cure. Most owners get more from documenting a durable relationship than from diluting it.

If one customer is a large share of your revenue and you want to know how buyers would read it, run the exit readiness check, or call (704) 343-6770 for a confidential conversation with an advisor who works in your sector.