Client Revenue Concentration: Managing Dependency Risk
How to measure and manage revenue concentration risk — what to do when one or two clients represent too large a share of your income.
What Is Revenue Concentration Risk?
Revenue concentration risk is the exposure created when a small number of clients generate a large proportion of your total revenue. If your top client represents 40% of your revenue and they cancel, you lose 40% of your business overnight — with no warning and often little recourse.
This is one of the most common and most underestimated risks in service businesses. It feels comfortable to have a large anchor client; the risk only becomes visible when they leave.
Measuring Concentration
Track three metrics:
Top client %: revenue from your single largest client ÷ total revenue. Warning threshold: > 20%.
Top 3 clients %: revenue from your three largest clients ÷ total revenue. Warning threshold: > 50%.
HHI (Herfindahl-Hirschman Index): a more precise concentration measure — sum of (each client's revenue share)². A score above 1,500 indicates significant concentration risk.
Ask AskBiz: *'What percentage of my revenue is from my top 3 clients, and how has this changed over the last 12 months?'*
When Concentration Becomes Dangerous
Concentration risk increases with:
- Single client dependency > 30% — one departing client is a business crisis
- Contract-based clients with upcoming renewals — renewal uncertainty creates periodic existential risk
- Clients in a single sector — a sector downturn hits all your large clients simultaneously
- Clients with internal champions who have left — when your main contact leaves a client, churn probability spikes
Ask AskBiz to flag clients with upcoming contract renewals and analyse your sector concentration: *'What percentage of my revenue comes from clients in the retail sector?'*
Reducing Concentration Over Time
Concentration is rarely reduced quickly without losing revenue — the strategy is to grow non-concentrated clients faster than the top clients grow.
Tactics:
1. Set a diversification target: e.g. no single client to represent > 20% of revenue by year-end. Track progress monthly in AskBiz.
2. Increase BD effort toward new logos: allocate a minimum number of BD hours per week specifically toward new client development, regardless of current pipeline status.
3. Introduce minimum engagement sizes: declining very small clients in favour of medium-sized ones makes concentration maths easier.
4. Upsell existing mid-tier clients: it is often faster to double revenue from a client representing 5% than to find a new client from scratch.