The short version
- If your top one to three customers exceed about fifteen to twenty percent of sales, buyers often discount by a similar share
- Owner dependent relationships are treated like concentration
- Diversifying takes years because buyers review three to five years of history
- Deal structure can bridge the risk, but usually shifts it back onto you
Why Buyers Care
A buyer is purchasing future revenue. If a few customers make up most of it, losing one could erase the profit that justified the price. Lenders see the same risk and may decline to fund.
That is why concentration is one of the most common deal killers in small company sales.
The Rule of Thumb
When the top customers exceed roughly fifteen to twenty percent of revenue, buyers frequently cut the price by about the same percentage, or walk away. The exact number depends on trade and contract strength.
One documented pattern shows how bad it can get. A company that depended entirely on one customer became unsellable the day that customer was itself acquired.
Owner Dependence Counts Too
Revenue that follows you personally gets discounted the same way. A stylist's client list, a salesman's growers or a solo estimator's contractors may not stay after you leave.
Spread relationships across staff and write down how each account is served.
Not Every Large Account Is a Problem
Look closely at what the customer really is. Several independent clients billed under one umbrella account look riskier than they are. A signed multi year contract changes the picture as well.
Present the facts clearly, and let the broker explain why the risk is lower than it first appears.
What You Can Do
- Add new customers steadily, starting years before you list
- Seek written agreements with your largest accounts
- Introduce a second contact for each major relationship
- Track revenue by customer so buyers can see trends
Structures That Bridge the Gap
When risk is real, a deal can include a transition period where you stay on, or payments tied to keeping key customers. These help a deal get funded, though they put some risk back on you.
Understand what a buyer might ask for. The brief on seller notes covers one common tool.
Where It Shows Up
Service companies serving a few operators feel this most, as described on the oilfield service and freight hauling pages.
A Simple Test
List your twenty largest customers and the share of sales each one represents over five years. Mark any that grew quickly or disappeared. If the top three exceed a fifth of sales, start a plan now.
Even modest progress helps. A company at twelve percent beats one at thirty, and buyers notice the direction of travel.
See what a buyer might offer: get a private price range.