Strategy
Customer Concentration Risk: What to Do When One Customer Is 40% of Your Revenue
Kalk Solutions Editorial
TL;DR
If one customer is 40% of your revenue, they control your pricing, your capacity planning and a big part of what your business is worth. Buyers and lenders treat it as a risk and often discount value or add earn-outs. Do not drop the anchor customer. Instead, set a target (no customer above 20 to 25%), build a pipeline for three to five new accounts in adjacent industries, and track concentration every quarter.
Quick answers
- What is customer concentration risk?
- The risk that losing or being squeezed by one large customer seriously damages your revenue, margins or business value. It is commonly flagged when one customer exceeds about 10 to 20% of revenue, and becomes a major issue above 30%.
- Does customer concentration reduce business value?
- Usually yes. Buyers and private equity firms often lower the multiple, require earn-outs, or ask for longer owner transition periods when one customer dominates revenue.
- How do I reduce customer concentration?
- Grow new accounts rather than shrinking the big one. Target adjacent industries that use your existing processes, build a visible pipeline, and set a concentration limit you track quarterly.
A 40% customer feels like security. Big POs, steady schedule, a relationship built over years. It is also the single biggest risk in your business. Your largest customer controls your price, your capacity and part of your exit value.
Tariff-driven re-sourcing is making this worse for many shops: one OEM moves a big program onshore, and suddenly it is half the schedule.
Why 40% is a problem
Atomic answer: high concentration gives one customer leverage over price and terms, makes revenue fragile, and lowers what buyers or lenders will pay for your business.
- Pricing pressure. They know you need them. Annual price-down requests get harder to refuse.
- Fragility. A program ends, a buyer changes, or they dual-source. Revenue drops overnight.
- Capacity lock-in. Their schedule decides yours. You turn down other work.
- Exit discount. Buyers often apply a lower multiple, an earn-out tied to retention, or both. See what private equity buyers look at beyond EBITDA.
Diagnose your real exposure
| Measure | Watch level | Act now level |
|---|---|---|
| Largest customer share of revenue | Over 15% | Over 25% |
| Top 5 customers share | Over 50% | Over 70% |
| Industries served | 2 to 3 | 1 |
| New customers in last 12 months | Under 5 | Under 2 |
The diversification plan
1. Keep the anchor, add around it
Do not walk away from your largest account. Protect the relationship and grow everything else.
2. Pick two or three adjacent industries
Look at what your machines and certifications already allow. An automotive stamping shop with IATF may suit agricultural equipment or HVAC. An AS9100 machine shop may suit medical or semiconductor equipment.
3. Build a visible pipeline
Most concentrated shops have no pipeline because the big customer filled the schedule. Start one. Our guide on building a sales pipeline when the owner is the only salesperson gives a simple structure.
4. Make new buyers able to find you
Create industry and capability pages for the new sectors. Buyers in a new industry will not know you. See how OEM buyers find a new US supplier.
5. Track it every quarter
Put concentration on the same dashboard as revenue and margin.
A realistic timeline
- Quarter 1: pick target industries, build pages, start pipeline.
- Quarters 2 to 4: first new accounts, trial orders.
- Year 2: new accounts grow; largest customer share drops toward 25%.
- Year 3: no customer above 20%, top five under 60%.
Next step
Start with a clear picture of who can find you today. Run the free Buyer Reach Audit or read our deeper guide on reducing customer concentration risk.
Related: How a documented sales pipeline increases what your business sells for.
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Questions about this topic
Should I raise prices on my biggest customer?
Only as part of a broader plan. The real fix is adding revenue elsewhere so you have more negotiating room.
How long does it take to fix concentration?
For most $5M to $50M shops, moving a 40% customer to under 25% takes 18 to 36 months of steady new-customer growth.
What is a healthy concentration level?
Many buyers are comfortable when no single customer is more than 10 to 15% of revenue and the top five are under about 50%.
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