Every owner remembers landing the big account. The one that changed the trajectory of the business, filled the order book, and made the payroll easy to meet. For years it feels like the best thing that ever happened to the company. Then a buyer arrives, opens the revenue by client, and treats that same account as a problem.
This is one of the most common surprises owners face when they go to market. The very thing that made the business successful, a deep relationship with one or two major clients, is the thing that makes a buyer nervous. Understanding why, and acting on it early, can be worth millions in enterprise value.
Why buyers see risk where you see loyalty
When a buyer pays for your business, they are paying for future cash flows. If a large share of those cash flows comes from a single client, the buyer is really betting on that one relationship continuing after you leave. They have to ask an uncomfortable question. What happens if that client walks?
The honest answer is that the buyer does not know, and neither, in truth, do you. Contracts get renegotiated, procurement teams change, and a new owner may not carry the same personal relationship you spent twenty years building. A business earning R120 million a year looks very different when R70 million of it depends on one customer who could give notice in ninety days.
How concentration shows up in the deal
Concentration rarely gets named plainly in a negotiation. It shows up in the price and the structure instead. A buyer may lower the multiple to reflect the risk. They may push a large part of the purchase price into an earnout, so you only receive it if the key client stays. In some cases they walk away entirely, deciding the business is really an extension of one fragile relationship.
As a rough guide, buyers start paying close attention when any single client exceeds about fifteen to twenty percent of revenue. Above thirty percent, expect it to become a central topic in every conversation. This is not a hard rule, but it reflects how professional acquirers think about risk.
What you can do about it
The good news is that concentration is fixable, but it takes time, which is exactly why it should be addressed long before a sale. Start by widening the base. Winning new mid sized clients that each take a modest share of revenue does more for your value than one more large account, even if the large account is easier to land.
Where a big client is unavoidable, make the relationship harder to lose. Longer term contracts, multiple points of contact inside the client, and services that are genuinely difficult to replace all reduce the buyer's fear. A client tied in by a three year agreement and embedded in your systems is a very different risk from one that renews by handshake each year.
Finally, move the relationship off yourself. If the client deals only with you, a buyer sees a relationship that leaves when you do. If they deal with a capable team, the relationship belongs to the business.
The point of doing this early
Reducing concentration is not a task for the months before a sale. It is a two or three year project that quietly reshapes how a buyer sees your business. Owners who start early bring a more balanced, more resilient company to market, and they are rewarded with better offers and cleaner deals. The client that built your business does not have to be the one that limits its value.