Outsider Insights | Two Accounts are Quietly Running Your Business

Outsider Insights

Across Chief Outsiders, we talk to hundreds of CEOs every month. In this series, we explore the trends and challenges we’re hearing from these discussions – and what you can do if you’re facing the same issues in your business.

Two Accounts are Quietly Running Your Business 

Strong revenue can hide a dangerous dependency. Here's the one number that reveals it.

A CEO recently walked us through a genuinely good year: revenue up, margins healthy, the kind of numbers most businesses would be thrilled with. Then he mentioned, almost as an aside, that two accounts made up more than a third of that growth. Neither was under contract in any way that guaranteed it would stay. He hadn't thought of that as a problem. He'd thought of it as a win.

It is a win. It's also a risk.

A few versions of this keep showing up:

• Revenue is climbing, but almost all of it traces back to two or three relationships expanding, not new logos coming in or a systematic way to expand across all current customers.
• A single account represents a large enough share of the business that losing it would materially change the company's trajectory for the year.
• One or two salespeople account for most of the company’s revenue and growth.
• The company lack a real outbound or new-business engine. (We've written before about how a comp plan can quietly discourage that kind of new-business hunting, and this is often where that pattern ends up.)
• Nobody's tracking customer concentration as a metric at all. Total revenue looks great, so no one's asked what it's actually made of.

This Isn't a Contradiction of "Grow Your Existing Accounts"

We’ve all heard the fastest way to drive revenue is through customers that already know and trust you. And that’s still important, Deepening the relationships you already have is still one of the highest-leverage things a CEO can do.

The problem shows up when that growth becomes the only growth, when expansion inside a handful of relationships quietly replaces the work of building new ones, until the business's success is effectively tied to a small number of phone calls.

What’s important is that your business development cannot rely on one or the other.. A company can and should strengthen its best relationships while still building a wider base underneath them. Many don't, simply because retention and expansion is easier and the numbers look fine either way.

What Concentration Actually Costs

The risks associated with that are real. You can lose a big account or a salesperson with a key relationship. And, as customers churn, you have a smaller base to expand.

But it isn't just about losing an account. Concentrated revenue changes the leverage in every conversation with that customer. Pricing, terms, and scope all tilt in their direction once they know how much you need them. It shows up in valuation conversations too, where investors discount revenue that's sitting in a small number of relationships, no matter how strong the growth line looks. It also shows up operationally: a pricing change, a leadership change, or a strategic shift at one customer can move your whole year, and there's very little you can do about a decision made inside someone else's building.

That does not mean the relationship is a mistake. It means the business has to build a more systemic business development function alongside it.

The One Number That Diagnoses This

You don't need a full commercial audit to find out how exposed you are. You need one calculation:

Concentration ratio = revenue from your top 3 accounts ÷ total revenue.

As a rough guide: under 20% is generally healthy. Between 20 and 40% is worth watching closely. Above 40% means a meaningful share of your company's fate sits outside your control, and it's worth treating that as an active risk.

Pair that with a second, equally simple split: pull last year's revenue growth and divide it into two buckets, expansion (existing accounts buying more) and new logos (net-net customers). It's common to find that 80% or more of your growth is really just a few relationships getting bigger, with almost nothing coming from outside the existing base.

Those two numbers, concentration ratio and the expansion/new-logo split, tell you in just a few minutes whether this is a real issue in your business or not.

Starting to Fix It

This doesn't require walking away from your best relationships or a six-month overhaul. Here are a few concrete starting moves:

• Set a concentration ceiling. Pick a threshold (many companies use 25 to 30% for any single account) and treat crossing it as a trigger for action, not just an observation.
• Track new-logo revenue as its own line, separate from total revenue. If it's not measured on its own, it won't get managed on its own. It'll keep getting absorbed into whatever the big accounts are doing that quarter.
• Build a simple "what if" model. Take your largest account and model what next year looks like if it disappeared entirely. Knowing the impac of losing your largest account is a quick way to get a board or leadership team to prioritize the actions to maintain that account and bring in new ones.
• Tier your accounts by risk, not just size. A large account with a multi-year contract and high switching costs carries a different risk than a large account with no contract and a single relationship holding it together. Treat them differently.
• Give new-business generation a real owner. If the honest answer to "who's responsible for new logos" is "it happens when it happens," that's the gap to close first.
• Identify and support your new-business team. Sales team members that are great at both finding new logos and expanding current ones are unicorns. If the same sales team members are responsible for both, identify your best new-logo generators and understand what they’re doing that can drive more new business.

Where This Leads

Risky revenue and a durable revenue system can look identical on a P&L. Learning to tell them apart helps you take control of your revenue quality before a customer decision or defection does it for you.

Frequently Asked Questions

• What is customer concentration?
  Customer concentration is a measure of how much of your business’ revenue comes from small number of customers. Higher customer concentration can create revenue, profitability, and growth risk and reduce your leverage to take the actions needed to maintain a healthy business.
• What is a healthy customer concentration ratio?
  There is no universal threshold, because the right customer concentration varies by industry, offering, and customer lifecycle. As a general guide, having your top three customers represent less than 20% of revenue is relatively healthy; 20–40% deserves attention; and above 40% is a signal to actively reduce concentration risk.
• Is customer concentration always a bad thing?
  No. Large customers can be highly profitable, loyal, and strategically valuable. The problem is not having big customers; it is becoming so dependent on a few of them that their decisions can materially affect your growth, margins, or valuation.
• How do you reduce customer concentration without slowing growth from existing accounts?
  Keep expanding strong customer relationships while building a more consistent new-logo engine alongside them. Identify whether each of your new business development team members and efforts are geared toward driving new logos or expansion – and whether you have the right balance between the two.
• What should a CEO track besides total revenue?
  We recommend tracking the percentage of revenue coming from your largest customers and separating revenue growth into new-logo growth and expansion from existing customers. Those measures reveal whether growth is broadening the business or making it more dependent on the same relationships.
• How does customer concentration affect company valuation?
  Investors often view concentrated revenue as higher risk because the loss or repricing of one account can materially change future earnings. Strong contracts, diversified relationships within the customer, high switching costs, and a healthy new-business pipeline can help mitigate that risk.
• What is the first step if our customer concentration is too high?
  Quantify the exposure first. Model what happens to revenue and profit if your largest account declines substantially or disappears, then identify the commercial actions needed to replace that revenue or better secure it. In many companies, the biggest gap is a repeatable way to generate new customers, rather than relying on a few rainmakers or accounts.