I run Plondo Network, and I also sit in the CFO chair. I own the books, the cash forecast, and the pricing. Every month I look at revenue and profit. The number that deserves the same attention is the one most owners skip: who the revenue depends on.
Owner-led companies track how much money comes in. They rarely track whose money it is. That gap is where concentration risk lives, and it stays hidden because the concentrated years feel like the good years.
Nobody Decides to Become Dependent
Concentration builds by accident. Your best client is usually the easiest one to serve. They pay on time, they trust your team, and they keep asking for more. So you give them more. You assign your best people. You answer their messages first. Their budget grows, and you grow with it.
No one in that story made a bad decision. Each choice was sensible. The sum of them is a company that cannot afford to lose one phone call.
Measure It Honestly
Put four cuts on paper. Share of revenue by client. Share by industry. Share by referral source. Share by single point of contact inside the client.
The last cut surprises people. An account can look diversified, with several departments and several invoices, and still depend on one person who champions you. When that person changes jobs, gets reorganized, or loses a budget fight, the account can end with no fault of yours. Your spreadsheet showed five lines. Your real exposure was one relationship.
Industry and referral source matter for the same reason. Ten clients in one sector can all feel the same bad quarter. Ten clients sent by one partner can all disappear if that partner changes course.
Revenue Understates the Danger
Here is an example, not a number from my books. Suppose one client is a third of your revenue. That sounds serious but survivable. Now look at profit. Your team, tools, and rent are mostly fixed. They cost the same whether that client stays or leaves. So the work that pays for your fixed base may sit mostly with that one account. Lose it, and revenue drops by a third while costs barely move. Profit can drop by far more than a third. It can drop to zero.
That is why revenue share is the wrong headline. Ask what the business earns without the largest client, with today’s team still on payroll.
The Cash Version of the Same Risk
Concentration shows up in cash before it shows up in revenue. If one client carries most of your receivables, one late payment becomes a company event. Their payment terms become your payroll schedule. A client that stretches from thirty days to sixty does not just delay an invoice. It takes away the month of cash you planned to spend on your people.
If you borrow, the problem grows. A lender who sees one debtor behind most of your receivables will ask hard questions, and a slow payer can push you toward a covenant breach when nothing else changed. For a services business, concentration is a payroll problem and a covenant problem long before it is a revenue problem.
What to Do About It
Set a ceiling you will not cross. Pick a share of revenue that no single client may exceed. Write it down and review it every quarter. A ceiling you do not write down is a wish.
Price the risk in. A large account should carry a premium, a longer commitment, or shorter payment terms. If one client holds that much of your future, the price should say so.
Keep a named second contact inside every large account. Not a name on an org chart. A person you have actually worked with.
Build pipeline in the quarters that feel safe. Most owners sell hard when they are scared. By then it is late, and buyers can tell. The safe quarters are when you have time to be picky.
Size your cash buffer to the largest client’s notice period. A generic three or six months is arbitrary. If your biggest client can leave in thirty days, ask what it costs to carry your team until you replace that work.
The Honest Part
Shrinking or turning away your biggest account costs real money. Most owners will not do it, and I understand why.
The workable middle is to grow around the account instead of cutting it. Keep serving the big client well. Then put your best selling effort into everyone else, until the big account is a smaller share because the rest got bigger, not because you pushed anyone away.
That is the discipline I try to hold at Plondo Network (https://plondo.com), an agency that builds websites, AI employees, and marketing for small businesses and direct selling companies. The pipeline in the safe quarters decides how the scary quarters go.