A new customer becomes the company’s largest account. Revenue rises, the team expands and the relationship looks like a success. It may be—but the business has also become more dependent on one set of decisions outside its control.
Customer concentration is not automatically a problem. It is a condition to understand: how much activity relies on one buyer, how durable that demand is and what would happen if the relationship changed.
Separate sales from money still owed
A customer can account for a large share of annual revenue and an even larger share of receivables at a particular date. The first describes sales activity; the second adds a question about payment exposure.
For a concrete example of disclosure, this annual report filed with the SEC discusses concentration in both customer revenue and contract receivables. It is an example of where to look, not a recommendation about that company or a claim that all businesses use identical thresholds.
Ask what capacity is tied to the account
Consider dedicated equipment, specialist staff, inventory and service commitments. If the customer reduces orders, can those resources serve other buyers? A long contract may still contain volume assumptions, renewal conditions or termination provisions worth understanding.
In an illustrative workshop, one buyer might provide forty percent of orders but require a highly specialised machine. The risk is not captured by the revenue percentage alone; the ability to redeploy that machine also matters.
Look for relationships hidden by the count
Ten customer names may belong to one corporate group or depend on the same end market. Conversely, one distributor may represent many underlying users, with its own distinct risks. Read how the company defines customers and explains channels.
A useful review asks what could cause several accounts to change at once: industry demand, regulation, geography or a shared funding source. Do not treat the number of invoices as a complete measure of diversification.
Review the response, not only the exposure
Look for practical measures such as broader sales channels, flexible capacity and appropriate credit controls. Ask whether the company can pursue those measures without damaging a valuable relationship or accepting uneconomic work.
The large customer remains an achievement. A careful business review simply holds two thoughts together: the account creates opportunity, and the dependence it creates deserves a plan.