Preparing for exit
How does customer concentration affect the value of a business?
Why reliance on a few customers worries buyers, how they measure it, how it shows up in price and deal terms, and what owners can do about it.
Lee Wallace, ACMA CGMA · Published
Question · 4 min read
In short
When a few customers provide a large share of a business's profit, a buyer faces the risk that losing one of them would change the business materially. Buyers usually reflect that risk in the price, in the deal structure, or in conditions before completion. There is no universal threshold. What matters is how dependent the earnings are, how secure the relationships are, and the trend. Owners can reduce concentration, but it takes time.
What is customer concentration?
Customer concentration describes how much of a business's revenue – and, more importantly, its profit – comes from a small number of customers. A business with a few hundred customers, none of them significant on their own, has low concentration. A business where one or two customers provide a large share of profit has high concentration.
Why does it worry buyers?
A buyer is paying for earnings that continue after completion. Concentration puts those earnings at risk in several ways:
- Loss: if a major customer leaves, a large part of the profit leaves with it.
- Bargaining power: a customer that knows it is important can press for lower prices or longer payment terms, squeezing margins and working capital.
- Change of ownership: a sale can prompt a major customer to review the relationship, especially if it was built on the owner personally.
- Contract terms: some contracts allow the customer to end them on a change of control.
How do buyers measure it?
There is no single test, but buyers typically look at:
- revenue and gross profit by customer, for the largest customer and the top five or ten, over several years;
- the trend: is concentration rising or falling?
- contracts: written or informal, their length, notice periods and any change-of-control clauses;
- who holds the relationship: the owner personally, or several people in the business;
- the history: how long each major customer has traded with the business, and whether volumes have been stable.
Profit matters more than revenue. A large customer on thin margins can be less important to value than its revenue suggests, and a smaller customer on high margins more so.
How does it show up in a deal?
High concentration rarely stops a sale on its own, but it usually affects the terms:
- Price: buyers reflect the extra risk in what they are prepared to pay.
- Structure: part of the price may be deferred (a fixed amount paid later) or conditional on future performance through an earn-out – sometimes linked to a key customer continuing to trade.
- Conditions: a buyer may ask to meet a major customer before completion, or for the relationship to be confirmed in some way. Any customer contact needs careful handling to protect confidentiality.
- Due diligence: expect detailed questions about the largest customers, their contracts and their profitability.
What can owners do about it?
Reducing concentration takes time, which is why owners often benefit from starting 12–36 months before a planned sale:
- Broaden the customer base gradually – new customers in the same market, or new markets for existing services.
- Strengthen the relationships you have: put key customer arrangements in writing, extend terms where that suits both sides, and make sure more than one person in the business knows each major customer.
- Understand profit by customer, so you know which relationships really drive earnings.
- Be ready to explain it. Where concentration remains, a clear record of the relationship – history, contract, margins, contacts – makes the risk easier for a buyer to assess.
A buyer will want to see changes sustained over time, not just started.
What this means in practice
Run a simple analysis now: revenue and gross profit by customer for the last three years, and the share taken by the largest one, three and five customers. If the answer surprises you, it will interest a buyer. That analysis is also one of the first things a buyer's due diligence asks for.
Our complete guide to preparing a business for exit covers concentration alongside the other value drivers, and our guide to valuing a small UK business explains how risk affects value.
How Proplexo can help
Our Exit Readiness Review is for owners considering an exit in the next 12–36 months. It covers valuation and EBITDA normalisation, working capital and the balance sheet, customer concentration and owner dependency, and due-diligence readiness, with a prioritised action plan.
This article is general information for owner-managed businesses, not advice on your circumstances.