Customer Concentration Risk: When One Client Owns You
How to spot, measure, and unwind customer concentration risk before it kills the company or the exit.
Customer concentration risk is the quiet killer. The company looks healthy on every dashboard. Revenue is up. Margin is fine. Then one email arrives from one client and forty percent of the business evaporates in a quarter.
The threshold investors and buyers actually use
Above 10% from a single customer: noted. Above 20%: a discount on valuation. Above 25%: the business is reclassified — you don't own a company, you own a contract. Above 40%: most institutional buyers walk.
If your top customer can fire you and end the business, your top customer owns the business.
How to measure it honestly
- By revenue: top customer ÷ trailing 12-month revenue.
- By gross profit: same denominator, gross profit numerator. Often worse than revenue because anchor customers got discounts.
- By cluster: parent companies, related entities, single decision-makers count as one customer.
How to unwind it without going broke
Lock in length, not price. Trade discount for term. A 12-month renewal is worth more than a 5% price bump.
Productise the work. A repeatable offering is sellable to ten new customers in the time bespoke work serves one.
Hire for the second customer, not the first. Most concentration is caused by capacity going entirely to the anchor.
Set a cap. Refuse to let any single customer pass 20% of revenue. Yes, even at the cost of growth this quarter.
FAQ
What percentage of revenue from one customer indicates concentration risk? 10% is noted, 25% is material, 40% is structural.
How to mitigate customer concentration risk? Lengthen contracts, productise the offer, cap revenue per logo, hire toward acquisition. See the full pattern inside a business health check.
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