A manufacturing business with one dominant customer can still sell. The concentration percentage alone does not decide the price. Buyers want to know why the customer buys from you, how hard it would be to switch, what the contract or order history shows, how profitable the account is and whether the relationship survives once the owner steps back. Strong answers to those questions narrow the discount. Weak answers move more of the price into earnouts and seller notes.
Customer concentration is one of the most common issues in lower-middle-market manufacturing. A shop wins a large OEM, aerospace prime or medical device program, grows around it, and five years later that customer is 40% or 60% of revenue. The growth was real. So is the risk a buyer sees.
This guide explains how buyers look past the percentage, what evidence reduces their concern and how concentration usually shows up in deal terms.
Why buyers worry about a single large customer
A buyer pays today for earnings it expects to collect for years. If one customer controls a large share of those earnings, a single decision outside the buyer’s control can change the investment.
The specific worries are predictable:
- Loss of the account. The customer re-sources the work, brings it in-house or ends the program.
- Price pressure. A large customer knows its leverage and may push for price cuts, longer payment terms or consignment inventory.
- Change of control. A contract may let the customer end or renegotiate the relationship when the supplier is sold.
- Owner relationship. If the customer’s buyers and engineers only deal with the owner, the relationship may not transfer.
- Financing. Lenders also look at concentration, which can limit how much debt the buyer can raise and how much cash is paid at closing.
What buyers examine beyond the concentration percentage
Two companies can each have a 50% customer and get very different offers. The difference is in the evidence behind the relationship.
| Question | Lower-risk answer | Higher-risk answer |
|---|---|---|
| How long has the customer bought from you? | Ten or more years, across several programs and buyer changes on the customer’s side | A recent win, or one program that is ramping up |
| What is the agreement? | A long-term or supply agreement with no termination right on a change of control | Purchase orders only, or a contract that lets the customer exit on a sale |
| How hard is it to switch suppliers? | Qualified processes, first-article approvals, customer audits and tooling that would take a long time to re-qualify elsewhere | Simple parts that many shops can make from a print |
| How many programs or part numbers? | Many part numbers across several programs and customer sites | One part family on one program |
| Is the account profitable? | Gross margin on the account at or above the company average, with price increases accepted | Thin margins, frequent price-down requests or extended payment terms |
| Who holds the relationship? | Several people at your company deal with several people at the customer | Only the owner talks to the customer’s buyer |
| Where is the customer’s own business heading? | Program extensions, forecast growth and a supplier scorecard showing strong performance | A program near end of life or a customer under financial pressure |
The buyer is trying to answer one practical question: if we own this business, how likely is it that this customer is still here, at similar margins, three to five years from now?
How concentration shows up in deal terms
Concentration rarely stops a deal by itself. It usually changes the structure. The more risk the buyer sees, the more of the price it ties to what happens after closing.
| Buyer response | How it works | What the seller should check |
|---|---|---|
| Lower multiple | The buyer prices in the risk up front. | Whether the evidence above supports a smaller discount |
| Earnout tied to the customer | Part of the price is paid only if revenue or gross profit from the customer stays above a set level. | Whether the metric is something the seller can influence after closing, and how it is measured |
| Larger seller note | The seller finances part of the price, which shares the risk. | Interest, term, subordination and what happens if the customer leaves |
| Longer owner transition | The buyer wants the owner involved until the relationship is transferred. | Length, role and pay for the transition |
| Customer consent or call before closing | The buyer asks to speak with the customer, usually late in the process. | Timing, who attends and what is disclosed |
A worked example shows the trade-off. Suppose a hypothetical fabricator has $2.5 million of adjusted EBITDA, with 55% of revenue from one OEM. Buyer A offers $15 million, all cash at closing. Buyer B offers $17 million, but $3 million is an earnout paid only if the OEM’s revenue stays above a set level for two years. If the account holds, Buyer B pays $2 million more. If it does not, the seller ends up with $14 million and two years of uncertainty. The right choice depends on how confident the seller is in the account, and the evidence above is what makes that judgment credible.
How to reduce the concentration discount before you sell
Some fixes take years. Others can be done in months.
Things that take time
- Diversify. Win new customers or new programs with the same customer at other sites. Growth from other accounts is the most direct way to bring the percentage down.
- Extend the agreement. Negotiate a longer-term supply agreement, and try to remove or soften any termination right on a change of control. Review this with an attorney.
Things that can start now
- Document the history: revenue and gross margin by year for the customer, by program and part number.
- Collect the proof of switching costs: first-article inspections, qualification records, customer audits, supplier scorecards and customer-owned tooling.
- Spread the relationship: make sure a second person at your company deals with the customer’s buyer, engineering and quality contacts. Our owner dependence guide includes a 30/60/90-day plan for this.
- Show the forward picture: firm orders, releases and program forecasts. Our guide to how buyers evaluate manufacturing backlog explains which of these buyers trust.
- Know the contract: read the assignment and change-of-control terms before a buyer does.
Confidentiality with a major customer
A dominant customer that hears about a sale too early can create the very risk the buyer is worried about. Most sellers keep the customer out of the process until late, after the price and main terms are agreed and the buyer’s diligence is largely complete. Even then, the conversation should be planned: who speaks, what is said and how continuity is presented.
A buyer that is a competitor of the customer, or a supplier to the customer’s competitors, can create a separate problem. That is part of screening buyers, not just pricing the deal.
Frequently asked questions
Can I sell a manufacturing business if one customer is most of my revenue?
Yes. Many manufacturing businesses with a dominant customer are sold. Expect buyers to look closely at the relationship and, in many cases, to propose an earnout, seller note or longer transition to share the risk.
What percentage counts as customer concentration?
There is no single threshold that every buyer uses. Buyers and lenders generally pay closer attention as one customer’s share of revenue or gross profit grows, and they look at the top several customers together as well as the largest one.
Will buyers talk to my biggest customer?
Often, yes, but usually late in the process and with the seller’s agreement. The timing and content of that conversation should be planned carefully to protect the relationship.
Does a long-term contract solve concentration risk?
It helps, especially if the contract has no termination right on a change of control. Buyers will still look at margins, switching costs, the customer’s own plans and who holds the relationship.
Should I take on low-margin work just to diversify?
Not automatically. Buyers look at gross profit by customer, so new revenue at weak margins may not help much. Diversification that brings in profitable, repeatable work is what improves the story.
Is customer concentration holding down your value? Start with a free, confidential manufacturing valuation, and we will show how buyers are likely to read your customer mix.
This article is general educational content for business owners. It is not legal, tax, accounting or transaction advice. The example is hypothetical and does not describe a real company or transaction.
