Customer Concentration

Customer concentration is the degree to which a business's revenue depends on a small number of customers. High customer concentration is a significant risk factor in business valuations because the departure of a major customer after a sale can materially impair the business's performance.

A commonly cited threshold is that any single customer representing more than 10–15% of total revenue constitutes a concentration risk — though this is a rule of thumb among business brokers and M&A advisors, not a regulatory standard. The threshold that triggers concern varies by deal size, industry, and buyer type. Businesses where one customer represents 25% or more of revenue often face ebitda-multiple" class="glossary-link">EBITDA multiple discounts of 1.0x to 2.0x below market comparables.

Buyers may respond to high concentration by requiring earn-outs, longer escrow or holdback periods, or seller guarantees tied to customer retention post-closing. Sellers can mitigate concentration risk before listing by signing multi-year contracts with major customers, documenting switching barriers, or diversifying the customer base.

See also: EBITDA Multiple, Earn-Out, Holdback, Due Diligence.