What Is Client Concentration Risk in Agency M&A?
Client concentration risk refers to the danger that a significant portion of an agency's revenue comes from a small number of clients. In agency M&A, this is one of the top factors that reduces valuation multiples and can kill deals entirely.
The Threshold Buyers Watch
If any single client represents more than 15–20% of total revenue, buyers flag it as a concentration risk. If one client exceeds 30%, expect a meaningful discount to your valuation multiple — or an earn-out structure tied to that client's retention.
Why It Matters in Agency Sales
When a founder sells, the buyer inherits the client relationships. If those relationships are primarily with the founder rather than the team, there's a real risk that major clients leave post-acquisition. A concentrated client base amplifies this risk — losing one client that represents 30% of revenue is catastrophic.
How to Reduce Concentration Before Selling
- Diversify proactively: 12–18 months before your target sale, invest in business development to reduce any single client below 15%
- Deepen relationships: Ensure multiple team members have strong relationships with each major client, not just the founder
- Secure contracts: Move major clients from month-to-month to 12–24 month contracts with notice periods
Related terms: Earn-Out, Recurring Revenue, Quality of Earnings
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