Customer Concentration Risk When Selling an MSP

Customer concentration risk is what a buyer calls it when too much of an MSP’s revenue sits with too few clients. Past roughly 20% from one account, expect questions, then a lower multiple, an earnout, or a holdback.

You know the account. It pays net 15, signs renewals in about ten minutes, and its tickets get answered before anyone else’s. Great for cash flow. Great for morale too, right up to the quarter it isn’t.

So why does it matter at sale time? Because a buyer sorts your client list by revenue before reading anything else.

Run the math on an MSP doing $4 million a year, with one manufacturing client at $1.3 million. The owner sees a long-term partner, while the analyst sees a line item that can sink a deal, highlights it in yellow, and asks for that contract before asking for anything else.

Customer Concentration Risk, Defined the Way a Buyer Reads It

The whole idea fits in one question. If your top client left next month, what would the business look like? Buyers don’t grade the relationship. They grade the answer, and they count revenue, margin, and recurring contracts when they do.

That question has a dollar answer. Lose a client worth 30% of revenue and your costs don’t shrink by 30%, because technicians stay on payroll, tools stay licensed, and the lease stays signed, so margin takes the hit long before anyone talks about a replacement.

If your network ran on a single uplink with no failover, you’d call it an outage waiting to happen. Revenue works the same way. One big account isn’t a client base. It’s a dependency.

Where Advisors Draw the Line on Customer Concentration

Ask three advisors for the number and you get three answers. These are published, dated, and written for MSP owners or lower middle market sellers.

Three advisors, three lines. None is a measured statistic from closed deals. They’re rules of thumb from people who sell advisory work, and I’d read them that way.

So use the lowest one, which means that above 20% you should assume the buyer’s diligence team has already circled that client, and at 30% or more you should plan for a hard conversation instead of a footnote. Customer mix is Group 3 of our MSP exit readiness checklist.

How Buyers Price Customer Concentration Risk

Buyers have four moves. They can lower the multiple. They can move part of the price into an earnout. They can hold part of it back until the big client renews. Or they can pass, and the Exit Planning Institute’s contributor says some do when concentration is significant.

Which one you get depends on the buyer, the contract, and how the client feels about a change of owner.

Here’s a made-up example, not market data. A buyer values your MSP at $6 million, your top client is 32% of revenue, and its contract is up in 14 months, so the offer arrives as $4.5 million at close and $1.5 million held until that client renews for 24 months. Same headline price. A quarter of it now rides on someone else’s signature.

Compare that with the baseline. The IBBA and M&A Source Market Pulse for Q4 2025 put average cash at close between 76% and 89%, across all industries, in a survey of 350 broker and advisor respondents fielded in January 2026. The survey says nothing about concentration. But an offer that lands well below that range is telling you something.

Concentration doesn’t disappear in diligence. It turns into terms. For how those terms work, see our guide to earnouts, seller notes, and rollover equity, and for the multiples underneath them, what MSPs actually sell for.

The terms aren’t the only cost. A buyer who finds the problem late starts doubting the rest of your numbers (and yes, buyers check). That gets expensive. Fast.

The Rest of the Revenue Picture

One client rarely shows up alone. Buyers read concentration next to two other numbers.

Recurring share. Aventis says that when less than half of an MSP’s revenue is recurring, many roll-up buyers won’t bid, because the business starts to look like a VAR or a project shop. Check where your big client sits. A large client on project billing is a different conversation than one on a monthly managed agreement.

Revenue churn. The same recap puts the worry line at churn above about 10%, and favors revenue churn over logo churn because it tracks the value you lose, not the number of names.

There’s good news in there too. The advisors say high concentration gets less likely as an MSP grows to roughly 50 to 100 people. Size dilutes it. But you can’t wait for size when the sale is 18 months out, and PE-backed MSP acquisitions are exactly where these numbers get read hardest.

How to Reduce Customer Concentration Before You Sell

Advice stops at “diversify.” Nobody says how.

Diversifying isn’t a project. You can’t run a campaign in March and show a buyer a balanced book in June, because the real fix is a pipeline, which means new clients arriving on a schedule you can predict. If it’s not repeatable, it’s not scalable.

Give it time. The Exit Planning Institute contributor says meaningful diversification takes 12 to 18 months at a minimum and suggests starting 18 to 24 months before a sale, with the sale process itself running 9 to 12 months or more. That author sells advisory work and cites no data, so treat the numbers as a planning guide, not a law.

1. Pull revenue and gross margin by client for three years and sort it. Look at the top of the list, then at the trend.
2. Set a ceiling for any one client. Use the lowest line above, 20%, because you’re planning for the toughest reader.
3. Build a new-client engine that doesn’t lean on referrals alone. Account-based marketing for MSPs points outreach at the accounts you want instead of waiting for them.
4. Read the big client’s contract. Term, renewal, termination, assignment. Buyers look for transferable agreements, per the Legal 500 piece, so find out now whether yours transfer, and have your attorney confirm.
5. Grow the other clients in place. Sell what the big client already buys into accounts that don’t.
6. Track the top client’s share every quarter, so a buyer sees a direction instead of a snapshot.

Buyers don’t expect perfect. A top client that slid from 34% to 24% over six quarters tells a better story than one parked at 22%. Direction counts.

If You Can’t Fix Customer Concentration Risk in Time

Sometimes the sale date is real and the runway isn’t. Then the job changes from fixing it to framing it.

• Show tenure. A client that has renewed for eight years reads differently than one signed last spring.
• Show depth. How many people at that client know your team by name? One champion is its own concentration risk.
• Show margin. If the big account earns less than the rest, say so. It may matter less than its revenue share suggests.
• Offer protection before it’s demanded. A holdback you propose reads better than one you’re dragged into.

One warning. The Exit Planning Institute contributor cautions that approaching a dominant customer about buying you can backfire, by inviting renegotiation, a replacement supplier, or the work moving in-house. Talk to your advisor before anyone at that client hears the word “sale.”

And before you change a single contract term, bring in your attorney. The U.S. Small Business Administration advises using a business valuation to set a value before marketing the company, and having an attorney review the sales agreement. That’s the floor, not the plan.

What to Do This Quarter

Not complicated. Just often overlooked. Sort your client list by revenue today, write down the top client’s share, and put a date next to the number you want it under.

C4 Solutions offers M&A advisory and exit preparation for MSPs and tech companies, including MSP valuation services, negotiation guidance and exit planning. If you want a second set of eyes on where your revenue sits before a buyer finds it, book a growth strategy call.