Your Biggest Customer May Also Be Your Biggest Risk

Imagine a table with four legs — but one leg is carrying half the weight. It may look stable. Until that one leg breaks.

Businesses work the same way. Landing a huge customer feels like a win. But when one customer becomes 30%, 40%, or 50% of revenue, success can quietly become dependency.

If that customer leaves, cuts spending, changes leadership, or demands better terms, you're not simply replacing a customer. You're replacing a significant piece of the business.

Where I draw the line

That's why I generally don't want any one customer representing more than roughly 15–20% of revenue.

And buyers notice this too. Two companies can each generate $5 million in revenue — but if one depends heavily on a single customer, they don't carry the same risk or the same value.

Same revenue. Different risk. Different value.

So ask yourself

If your largest customer disappeared tomorrow, would it hurt — or would it fundamentally change your company?

If it's the second one, don't wait for the relationship to change. Keep serving that customer exceptionally well. But start building the other legs of the table.

From Chapter 4 of The CFO Operating System — Value Driver: Customer Concentration.