Key Insight
Customer concentration doesn't just affect the multiple — above certain thresholds, it makes the deal unfundable. Know the number before you go to LOI.
Why Concentration Is a Risk
A business with 80% of revenue from three customers is fundamentally different from a business with 200 customers, each representing less than 1% of revenue. If any of those three customers leave — through a relationship change, a rebid loss, or a decision to bring services in-house — the business loses a catastrophic percentage of revenue before the buyer has had any chance to diversify.
This risk is amplified in acquisitions because the very act of selling can destabilize concentrated relationships. A customer who does business with a company because of a personal relationship with the founder may not re-up their contract when a new owner takes over.
The Standard Thresholds
While thresholds vary by lender and deal, common benchmarks:
| Concentration Level | Typical Implication |
|---|---|
| Single customer < 10% | No material concentration concern |
| Single customer 10-20% | Flag for due diligence, model the loss scenario |
| Single customer 20-25% | Negotiation leverage for buyer, lender scrutiny |
| Single customer > 25% | Most SBA lenders require additional analysis or may decline |
| Single customer > 40% | Near-disqualifying for SBA; significant multiple discount |
Assessing Transferability
Concentration risk is amplified or mitigated by the nature of the customer relationship:
Lower-risk concentrated customers: Large enterprise clients on multi-year contracts with auto-renew provisions, where the relationship is with the organization rather than the founder.
Higher-risk concentrated customers: Mid-market clients where the primary contact is a personal friend of the owner, on annual contracts that renew informally, with no long-term commitment.
The due diligence question isn't just "how concentrated?" — it's "will this customer survive the transition?"
An IT managed services firm earns $900K/year. Its largest client is a regional manufacturer generating $360K (40%) in annual recurring revenue. The client's CTO has a 15-year friendship with the seller. The contract is month-to-month. The new owner has a fine first meeting with the CTO. Six months post-close, the client goes out to bid, citing "wanting to evaluate the market." They switch providers. The business is now a $540K/year firm priced as a $900K/year firm.
Pricing for Concentration
Buyers can negotiate concentration into the deal structure:
- Reduced multiple — price in the loss scenario explicitly at the valuation stage
- Earnout tied to customer retention — make part of the price contingent on the concentrated customer renewing post-close
- Escrow holdback — withhold a portion of the purchase price, released only if the customer remains through the first contract renewal
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