Customer concentration risk is when too much revenue depends on too few customers, a structural vulnerability that reduces enterprise value and affects how buyers price and structure any offer.

Most buyers apply a threshold: a single customer representing more than 15 to 20 percent of revenue is a concentration risk that requires acknowledgement. Above 30 to 40 percent, it becomes a central deal issue, reflected in a lower multiple, a larger earnout component, or in some cases a decision not to proceed. The buyer is pricing the probability that the customer leaves after the sale, taking a disproportionate share of the earnings the multiple was applied to.

The valuation impact is not linear. Moving from 40 percent concentration to 25 percent does not produce a proportional improvement. Getting below the threshold entirely tends to unlock a meaningful step-change in how buyers perceive the business, often worth more in multiple expansion than a comparable improvement in EBITDA.

Customer concentration is one of the most common and most addressable valuation discounts in owner-managed businesses. See how Wefinx approaches value growth.

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