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Customer concentration

CONCEPT · LAST REVIEWED 2026-09 · SOURCED FROM 2 SESSIONS, APR AND SEP 2026

Customer concentration is the percentage of revenue tied to your biggest customer. Investors and acquirers treat it as a fragility metric: the more one account matters, the more the business depends on a relationship it may not control.

Why it matters

Section titled “Why it matters”

In an exit, concentration rarely kills the deal. It reshapes it.

From the room

Section titled “From the room”

“One of our clients recently had 28% of their revenues was one customer. If we exit, that may not change the price of the deal, but it will change the structure of a deal from an all-cash deal to an earn-out. Above 15% they flag it as a buyer. Above 25% you’re going to have to understand, oh, the founder needs to stay with the company because the biggest customer would leave if he’s not here.”

— Three-exit founder who now runs an exit-readiness advisory · session, Sep 2026

Concentration and founder dependency travel together: the question behind both is whether the company runs without you. Venture lenders flag the same thing from the debt side, and seed investors flagged it a different way in an earlier session, where a single $100K pilot from a $100B company read as weaker evidence than several mid-size deployments.

Where founders get it wrong

Section titled “Where founders get it wrong”
  • Finding out inside diligence. Bringing on new customers to dilute the share takes quarters, so it belongs on the readiness list a year out.
  • Treating the big logo purely as an asset.
  • Ignoring founder dependency, which is the same risk wearing a different hat.

Numbers from the room

Section titled “Numbers from the room”
ThresholdWhat happens
Above ~15%Buyers flag it
Above ~25%Structure shifts from all-cash toward earn-out; founder retention becomes a condition

Go deeper

Section titled “Go deeper”