The Customer Who Sets Your Price

In the first half of 2025, two manufacturers pulled out of their own sale processes partway through. Not because a buyer walked, and not because the price came in low. FOCUS Investment Banking reported that each of them lost a customer that made up more than half of revenue while the deal was live, and once that happened there was no deal left to save. The business that existed on Monday was a different, smaller, riskier business by Friday, and everyone in the room knew it.

That is the extreme version. The everyday version is quieter and far more common. You have one account, maybe two, that you could not comfortably lose. Everybody in the building knows which one it is. You structure around keeping it happy. And when you eventually go to sell the company, or refinance it, or bring in a partner, that account stops being your best customer and starts being the first thing the other side prices.

The number a buyer runs before the good news

Owners walk into a sale expecting the conversation to start with growth, margin, and the team they built. Buyers start somewhere colder. One of the first calculations a serious acquirer runs is what percent of your revenue comes from your top customer, then your top three, then your top five. That single ratio shapes how they read everything after it.

There is no official cutoff, but the working rule most buyers carry is that once a single customer clears roughly 20 to 30 percent of revenue, the risk stops being a footnote and starts changing the terms. Above that line, an acquirer isn't buying a stream of income anymore. They're buying a bet that one relationship, which they don't control and often can't even meet during diligence, holds together through a change of ownership. That is a genuinely worse thing to own, and they price it like one.

Pricing it doesn't only mean a lower multiple, though it usually means that too. It means more of the money moves out of your hands and into conditions. A slug of the purchase price gets tied to that customer staying past close. Cash you expected at the table turns into an earnout that only pays if the account renews. The escrow gets deeper. Every one of those moves is the buyer saying the same thing in legal language: I don't fully trust this revenue, so I'm not going to fully pay for it until it proves itself.

Why one big customer costs more than it pays

The hard part is that concentration usually grows out of doing something right. You landed a great account, you served it well, it gave you more work, and you took the work because turning it down felt insane. Nobody makes a decision to become dependent. You just keep saying yes to your best customer until the day you realize the whole company leans on it.

And that lean shows up in more than the sale price. A concentrated customer quietly runs your business. They get the payment terms they want because you can't afford the fight. They set the pace of your production and the shape of your roadmap. You are, in a real sense, already partly working for them, you just haven't priced your own dependence the way an outside buyer will.

I have sat across from owners who were genuinely proud of a marquee account, and had every reason to be, who went a little pale when they saw what that same account did to their valuation. The revenue was real. The relationship was real. But real revenue from a single source is worth less per dollar than the same revenue spread across 30 customers, because 30 customers can't all leave in the same phone call.

Bringing the number down before you need to

You reduce concentration the same way you built it, one deliberate decision at a time, and it takes longer than any other value lever on this list. Which is exactly why it can't wait until you've decided to sell.

Know the real number first. Not a gut feel, the actual figure: top customer, top three, top five, as a percent of revenue and of gross profit both, because sometimes your biggest account is also your thinnest margin and the concentration is even worse than the top line suggests.

Then aim your growth at the gap. Commission plans, marketing spend, and your own selling time should pull hardest toward new and mid-tier accounts, not toward feeding more volume into the customer you're already too dependent on. Feeding the big account is the path of least resistance, so left alone, that's the path the business takes.

And build switching cost into the relationships you do have. Contracts with real term instead of handshake reorders. Deeper integration into how the customer runs. Multiple contacts on their side, so the relationship survives one person changing jobs. A customer who would find it genuinely painful to leave is worth far more, to you and to any buyer, than one who could walk on 90 days' notice, whatever the two of them spend today.

The revenue was never the problem. The problem is owning it in a shape that lets one phone call reprice your whole company. Fix the shape while the customer is still happy and you still have time. That work is slow, unglamorous, and close to impossible to do in a hurry, which is the whole reason it pays.