Customer concentration
Customer concentration is the share of your revenue that comes from your largest customers. A high share is a risk that lowers valuation and complicates a sale.
Customer concentration measures how much of your revenue depends on a few customers. If one customer pays 40 percent of your MRR, losing them is a crisis, and a buyer prices that in. For a small SaaS it is one of the most common reasons an offer comes in low or comes with strings attached.
How to calculate it
Example: a SaaS has $20,000 MRR. Its largest customer pays $5,000, so concentration is 5,000 / 20,000 = 25 percent. The top five pay $11,000, so top-five concentration is 55 percent. Measure it with MRR or ARR, and for each customer, not each user account.
What buyers do with it
There is no universal threshold. One advisory firm's guidance, summarized by Livmo, describes buyer reactions in bands: under 10 percent is routine diligence, 10 to 20 percent may cost about half a turn of multiple, 20 to 30 percent can bring a holdback or an earnout tied to that customer's renewal, and above 30 percent many buyers walk. Treat these as one source's view, not a standard. The pattern is stable, though: more concentration, lower multiple and more conditions.
Why SaaS is exposed
Recurring revenue is only valuable if it recurs. A single large contract with a short term, no auto-renewal or a termination-for-convenience clause makes the revenue less reliable. Buyers check contract terms and churn history for those accounts in due diligence.
Reducing it
- Win more mid-size customers so the big one shrinks as a percentage.
- Move large accounts to multi-year contracts.
- Build a relationship with more than one contact at each large account.
- Show the trend. A move from 30 percent to 22 percent with a plan is credible.
For small SaaS
A big early customer can be what funds you, so concentration is not always a mistake. It matters most when you plan an exit, so start shifting the mix 6 to 12 months before. It also matters for day-to-day risk: a single cancellation should not threaten payroll.