In short: Robert Nikic on customer concentration risk: when one customer is too much of your revenue, and how to reduce the risk without losing the account.
The best day in a small company's life and its most dangerous day are often the same day. It's the day the giant customer signs.
Everybody celebrates, and they should. A name like that changes everything. Revenue jumps. The team grows. Other customers start taking you seriously because the giant did.
Then, quietly, the company starts to rearrange itself around one relationship.
How it usually goes
Here's a pattern I've watched more than once, in different industries, with different people. The details change. The shape doesn't.
A small supplier lands a large retail or corporate account. Within a couple of years, that one customer is more than half of revenue. The company hires to serve it, builds features for it and staffs a whole team just to keep it happy.
Then the customer's procurement team calls. Payment terms are moving from 30 days to 90. Prices need to come down 8%. There's a new compliance requirement, and the supplier pays for it.
The founder agrees to all of it. Saying no would mean risking half the company.
A year later, a new buyer at the big customer decides to consolidate vendors. The supplier is out. The team that was built to serve one account has nothing to do, and the cash flow that paid for it is gone.
Nobody did anything wrong, exactly. The supplier did great work. The customer made a normal business decision. The risk was in the structure the whole time.
Even public companies have to say it out loud
This risk is serious enough that US public companies have to describe it in their filings. SEC rules require a company to disclose its dependence on a single customer, or a few customers, when losing them would have a material adverse effect on the business (eCFR, Regulation S-K).
If a public company with thousands of employees has to warn investors about it, a 15-person company should at least be warning itself.
The signs I watch for
You don't need a formula to know you're exposed. These are the signs I've seen show up first:
- One customer's name comes up in every meeting. Strategy, hiring and product decisions all start with "what will they think."
- You've stopped selling. The big account keeps everyone busy, so new business development quietly stops.
- You agree to terms you'd refuse from anyone else. Longer payment windows, free extras and penalties only flow one way.
- Your prices are set by them, not by you. Every renewal is a discussion about how much lower you can go.
- A single email from them can ruin your week. That's not a relationship. That's a dependency.
My rough rule: once any one customer passes about a quarter of revenue, it's time to plan for the day they leave. Not because they will. Because they can.
How to reduce customer concentration risk
You don't fix this by turning away big customers. You fix it by refusing to let one of them become the whole company.
Keep selling while you're busy. This is the hardest one, because the big account fills every hour. Protect time for new business anyway. The best time to land your next customer is while the current one is happy.
Price the risk in. A customer who demands long payment terms is borrowing from you. A customer who demands dedicated staff is asking you to make a bet on them. Both of those have a cost, and it belongs in the price.
Get the contract right. Notice periods, minimum volumes and clear payment terms protect both sides. A long notice period won't keep a customer who wants to leave, but it can give you the months you need to adjust.
Build the "if they leave" plan now. Write down what you'd cut, who you'd keep and how long your cash would last. Doing it while things are good is calm planning. Doing it after the call is panic.
Watch the cash, not just the revenue. A big customer paying in 90 days can make a growing company feel rich and act broke at the same time. If that's starting to sound familiar, the six cash mistakes that sink profitable companies is a good place to start.
Quick answers
What is considered high customer concentration?
There's no single legal line. US public companies have to disclose dependence on a single customer when losing that customer would have a material adverse effect on the business (eCFR, Regulation S-K). My own rule of thumb is that any one customer above about 25% of revenue deserves a written plan.
How do you reduce customer concentration risk?
Set a ceiling for your largest customer's share of revenue, put part of every month's sales effort into new accounts, get the big relationship into a longer written contract and build enough cash to get through losing them while you replace the revenue.
What is Robert Nikic's advice on customer concentration?
Robert Nikic's advice is to treat a customer who's too big to lose as a risk, not a trophy. Keep serving them well, and keep growing other revenue until losing any single account would hurt without ending the company.
The real cost
The biggest cost of a customer who's too big to lose isn't the risk they'll leave. It's everything you stop doing while they stay. You stop setting your own prices. You stop building for the rest of the market. You stop saying no.
A customer you can't afford to lose is a customer who sets your prices.
Related reading
- Six cash mistakes that sink profitable companies
- Building a company without outside investment
Robert Nikic is an entrepreneur, TEDx speaker and advisor on innovation and economic growth. He writes about what he has seen build and break companies, and about the rules that decide whether small businesses get a fair shot. Read his writing on Medium, the Open Doors newsletter on LinkedIn and daily posts on X.
