Build a customer concentration risk mitigation plan

Customer Concentration Is the Risk Most Plans Pretend Isn't There

Concentration risk kills more post-Series-A companies than product-market fit issues — losing the top customer before diversification has happened is often terminal. CB Insights' post-mortems list concentration loss among the top 10 causes of startup failure at the growth stage. The Reforge B2B PMF research makes a sharper point: concentration often hides PMF weakness — one loud customer shapes the roadmap, which in turn makes the product less viable for the adjacent segments that would diversify the base.

How the Build a customer concentration risk mitigation plan Prompt Works

The prompt quantifies concentration against healthy benchmarks (top-1 <10%, top-5 <25%), maps dependencies beyond revenue (roadmap influence, contract leverage, relationship surface), and sequences mitigation through four levers rather than a single "sell more" instinct. The roadmap influence metric is the often-missed one — when one customer shapes a large share of current sprint work, they have already captured the product.

When to Use It

• Top 1 customer is >20% of ARR.
• A board or investor is asking for a concentration memo.
• One customer is dominating the sprint backlog.
• You are approaching a fundraise and the cap table question is coming.
• A top account is renegotiating and you realize how much leverage they have.

Common Pitfalls

• Measuring only revenue concentration. Roadmap influence and feature usage concentration are leading indicators revenue concentration lags.
• Hardening contracts without diversification. Contract terms slow the bleed but do not cure the condition. You need adjacent segments.
• Productizing custom features too late. Every quarter a custom feature sits as services, it compounds into a bigger diversification blocker.

Sources

• Why Startups Fail — CB Insights
• B2B Product-Market Fit — Reforge
• First Round Review — First Round
• The Product Strategy Stack — Reforge