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Customer Concentration

Reliance on a small number of customers, which buyers treat as a risk and pay less for.

What It Is​

Customer concentration is the degree to which a company's revenue depends on a handful of accounts. A business with one client supplying half its sales is exposed: if that client leaves, raises a dispute, or gets acquired, the cash flow a buyer is paying for can collapse overnight. Burlingham draws the line precisely. As he defines it, customer concentration is "reliance on a few customers; if any one exceeds ~15% of sales, buyers discount the price." Past that threshold, the buyer starts seeing the relationship, not the company, as the asset.

This matters because of what an acquirer is actually purchasing. Burlingham is blunt that every deal comes down to expected future cash, not the past:

"Cash is king because it's the only thing you can spend. People buy businesses so that they'll eventually have more of it."

Burlingham, Finish Big, ch. 3

If most of that cash rides on one or two accounts, the future is fragile, and a careful buyer prices the fragility in.

Why Buyers Discount It​

Both authors frame customer concentration as a form of overdependence, the same risk category as depending on a single supplier, a single employee, or the owner. Burlingham lists it among the eight Sellability Score factors he borrows from Warrillow, where it sits under "overdependence" alongside the Switzerland Structure: independence from any one customer, supplier, or staff member.

Warrillow's larger point explains the discount. A business is worth what it is worth to a specific buyer, and risk is subtracted from that figure:

"The art of selling your business is getting someone to value something they cannot touch. In essence, they are buying a story about what your business could be in their hands."

Warrillow, The Art of Selling Your Business, ch. 1

A concentrated customer base weakens that story. The buyer cannot be sure the revenue transfers, so the offer drops, the earnout grows, or the deal does not close at all.

Snider sharpens the threshold and the stakes. He treats customer concentration as a Customer Capital risk, one of the Four Cs of intangible capital, and warns that it can sink a sale outright:

"If one customer accounts for more than 25% of your total revenue, it actually reduces your value—sometimes to the point that it is a deal killer."

Snider, Walking to Destiny, ch. 7

His de-risking remedy is concrete. Lock in transferable contracts so the relationships survive a change of ownership, and put a written diversification strategy in place so the company can show a credible path toward spreading revenue across more accounts.

How It Connects to the Owner​

Concentration often travels with owner dependence. When the founder personally holds the one big relationship, the buyer faces a double risk: lose the owner and you may lose the customer. Burlingham's prescription throughout the book is to build a company that stands on its own, captured in his governing maxim:

"You should build a business today as if you will own it forever but could sell it tomorrow."

Burlingham, Finish Big, introduction

Diversifying the customer base is one of the most concrete ways to act on that. It is also one of the slowest, which is why it belongs to the years-long preparation both books insist on rather than the months before a sale.

What an Owner Can Do​

The fix is structural, not cosmetic. Spread revenue across more accounts so no single client crosses the rough 15 percent line. Convert one-off project clients into recurring revenue so the income is predictable rather than relationship-dependent. Move marquee relationships off the owner and onto the team. None of this is fast, but each step lowers the perceived risk a buyer subtracts from the price, and a less concentrated company is simply worth more in more buyers' hands.

Further Reading​

Sources: Burlingham, Finish Big ch.3; Warrillow, The Art of Selling Your Business ch.1; Snider, Walking to Destiny, ch. 7.