Customer Concentration Risk In Commercial Services
Commercial services businesses often have heavy customer concentration. Here is how I evaluate whether the concentration is a risk or a feature.
Most commercial services businesses I diligence have customer concentration that would scare off a typical PE buyer. The top customer is twenty percent of revenue. The top three are forty percent. The top ten are sixty-five percent. On the surface, those numbers signal risk. In practice, the question is more nuanced.
What concentration actually tells you
Concentration is a signal, not a verdict. The same forty-percent-from-top-three number can mean two completely different things depending on context.
In the dangerous version, the top customers are on month-to-month contracts, with no switching costs, in a market with credible competitors. Lose one customer and the business takes a fifteen-percent revenue hit overnight.
In the manageable version, the top customers are on multi-year contracts, with embedded operational integration, in a market where switching costs are real. The concentration looks identical on the spreadsheet. The actual risk is fundamentally different.
The questions I ask to tell them apart
Tenure: how long has each top customer been a customer? A two-year-old relationship is different from a fifteen-year-old one. Long tenure is not just sentiment. It usually means the customer has integrated the service into their operating model in ways that make switching costly.
Contract structure: month-to-month or multi-year? Auto-renewing or requiring active renewal? With or without a termination-for-convenience clause? The contract structure tells you what the customer can do legally if they want out.
Operational integration: does the service touch the customer's own operations in ways that make switching disruptive? A janitorial service that has a key card, a delivery schedule, and a dedicated team is more embedded than one that just shows up after hours.
Personal relationships: who at the customer makes the renewal decision, and how strong is the relationship between that person and the seller? A relationship-dependent contract is a different risk profile than one held by a procurement department on a regular review cycle.
What concentration also gets you
The same concentration that creates risk also creates pricing power. A small number of large customers usually means tighter operational coupling, longer contract terms, and higher switching costs than a diffuse customer base.
I have closed deals on businesses with sixty percent of revenue in the top five customers because the answers to the four questions above told me the concentration was structurally stable. The trailing twelve EBITDA was higher than a more diffuse business of the same revenue level would have produced, and the customer base was more durable than the concentration metric alone suggested.
How I price it
For risky concentration, I want a structural protection. Either a portion of the purchase price held back tied to customer retention through a defined window, or an earn-out structure that adjusts the price based on actual customer outcomes in the first twelve months.
For stable concentration, the protection comes from the underlying contracts and relationships, not from deal structure. Pay the right price and execute the post-close transition well.
The concentration number is the question, not the answer.
Written by Ramy Stephanos, SFAdvisor - Acquire.