Customer Concentration Risk in Small Machine Shops

What the issue is

Customer concentration is outsized share of revenue or gross margin tied to one or a few accounts. For a buyer, that is not about loyalty—it is amplitude of downside if pricing, volume, or payment cadence shifts after close. This is where buyers start to lose confidence in the “steady earnings” story—even when last year looked clean.

How it shows up operationally

  • A handful of part families or programs absorb most spindle or assembly hours.
  • Dedicated fixtures, tooling packages, or inspection plans exist for specific customers.
  • Payment terms, retainage, or milestone billing concentrate working capital with those same names.
  • Losing the top account would leave recognizable holes in the schedule within weeks, not quarters.

How buyers and diligence interpret it

In most cases, analysts separate recurring program work from one-off project spikes. They read contracts, change-order history, and quality metrics by customer. Reference calls often stress whether the relationship is with the company or with the current owner—especially when the owner is the face of the account.

Buyers will run a partial loss revenue case on the top account even when the seller insists the work is “sticky”—because stickiness rarely survives a procurement reset or a new plant manager.

What it changes in a transaction

This becomes a problem when the buyer’s stress case is not theoretical—models add partial revenue roll-off, margin compression if work must be rebid, or slower receivable turns. Covenant headroom, earnout triggers, and seller notes can all move when concentration is high. The output is frequently a different multiple or more contingent consideration—not always a hard stop.

Takeaway: this is what buyers are actually discounting—tail risk they can model, not loyalty you can describe.

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