What is Client Concentration Risk?

Client concentration risk occurs when a large percentage of your agency's revenue depends on one or a few clients. The general rule of thumb is that if any single client accounts for more than 20-25% of total revenue, or if your top three clients represent more than 50%, your agency faces significant concentration risk. Losing one of these clients could cause serious financial harm. This risk is common in agencies of all sizes but especially dangerous for smaller firms. A 10-person agency with a client that represents 40% of revenue is essentially betting the business on that single relationship. If the client changes direction, brings the work in-house, or goes through budget cuts, the agency faces layoffs, cash flow crises, or worse. Even the threat of losing a major client can distort decision-making, causing agencies to over-accommodate demands or accept unfavorable terms to keep the relationship. Measuring concentration risk is straightforward. Calculate each client's share of total revenue and rank them. A healthy distribution shows no single client above 15-20% and a gradually declining curve. An unhealthy distribution shows a steep drop-off where one or two clients dominate and the remaining clients are negligible. Many agencies also track concentration by industry since having multiple clients in the same sector means an industry downturn could impact several relationships simultaneously. Reducing concentration risk requires a deliberate strategy to diversify. This includes investing in marketing and business development to grow the client base, targeting clients in different industries, setting a maximum percentage threshold for any single client, and building recurring revenue that spreads across many relationships. Some agencies also create policies around when to stop accepting additional work from a client that is becoming too large a share of revenue.