Customer Concentration Risk: Model Revenue Exposure by Account

A company can grow while depending heavily on a small number of customers. That concentration may reflect a deliberate enterprise strategy, but it also creates exposure if a major account contracts, delays renewal, or changes priorities. A simple model makes the dependency visible without pretending that one universal threshold fits every business.

Choose the revenue basis and account grain

Decide whether the analysis uses recognized revenue, bookings, recurring revenue, gross profit, or another measure. Each answers a different question. Use a consistent time period and clarify whether parent companies and subsidiaries are grouped together.

Calculate each account’s share by dividing its selected contribution by the total for the same period and scope. Show both the largest-account shares and the distribution across the rest of the base; a top-customer percentage alone hides whether exposure is concentrated in several accounts.

• State the metric, period, and currency basis.
• Choose parent or operating-account grouping deliberately.
• Separate committed, recurring, and one-time revenue where relevant.

Model what could change

Create scenarios such as a partial contraction, delayed renewal, or loss of one account, and estimate the effect on revenue, gross margin, and capacity. Use ranges when renewal or usage is uncertain. A scenario is a planning tool, not a prediction.

Add context about account health, contract timing, product dependence, and delivery commitments. Two customers with the same revenue share can pose different risks if one has a long-term contract and the other can leave quickly.

• Show base, downside, and recovery cases.
• Include gross-margin and cash timing when material.
• Record assumptions and data owners.

Connect the model to operating decisions

Review concentration alongside retention plans, pipeline diversity, and delivery capacity. The response may be to diversify acquisition, strengthen continuity for a major account, or reserve capacity for a risk scenario. Avoid setting arbitrary concentration limits without considering the company’s strategy and economics.

Refresh the view on a cadence that matches renewal and planning decisions. Flag changes in account hierarchy and major contract events so a sudden reporting shift is not mistaken for a change in underlying exposure.

• Assign owners to material account dependencies.
• Review concentration before major investment commitments.
• Track whether the action reduces exposure or only shifts its timing.