A major client can transform a small web agency. Their projects provide steady work, their team understands the value of the relationship, and their applications give developers interesting problems to solve. The partnership may last for years.
Then the client changes direction. A new executive consolidates suppliers, an internal team takes over development, or a product is discontinued. Even an excellent agency cannot control every decision inside a customer’s business.
Client concentration is the risk created when a significant share of an agency’s revenue depends on one customer or a small group of related customers. It does not mean that a large client is undesirable. It means the agency should understand what losing that client would require it to change.
Start with the whole relationship
Review revenue by customer over a consistent period. Include ongoing support, development projects, and other services, while distinguishing signed recurring work from work that has not yet been approved.
For example, imagine an agency with $400,000 in annual revenue. One customer accounts for $200,000, or half of the total. The remaining clients account for the other half. These figures are illustrative, but the question is real: what would happen to staffing, cash, and planned investments if the largest customer reduced its work?
Look beyond company names. Several contracts may ultimately depend on the same parent organization, decision-maker, or product budget. A portfolio that appears diversified on paper may be more concentrated than it first seems.
Revenue is only part of the exposure
A large account may also consume most of a particular developer’s time, influence hiring decisions, or require specialized infrastructure. Losing it could free capacity, but that capacity may not immediately match the work other clients need.
Map the relationship: who communicates with the customer, which people can deliver its work, when major agreements or decisions are expected, and what knowledge is held by only one person. The aim is not to predict a departure. It is to understand the operational consequences of change.
Build options while the relationship is healthy
The first response should not be to neglect the client that helped the agency grow. Continue delivering well and communicate openly about upcoming work. At the same time, reserve some business-development capacity to cultivate other suitable customers.
That may mean developing a focused service for a second market, following up with existing contacts, or documenting expertise that can be applied to another organization. If the team is fully committed to the largest client, consider what would have to change before accepting another substantial project.
A financial reserve can also provide time to respond, but the amount depends on the agency’s obligations and circumstances. Review the plan with the person responsible for its finances rather than assuming that a generic percentage is appropriate.
Rehearse the decision, not the disaster
Use a simple scenario: what if the customer reduced its work at the next renewal? Identify which costs would remain, how much notice the agreement provides, which employees or contractors would be affected, and what other work might realistically be available.
The exercise is not a forecast. It reveals decisions that are easier to make before an urgent deadline. An agency can value its largest client and still prepare for a future in which the mix of work changes.
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