How to Conduct Customer Diligence on an Early-Stage Company

Customer diligence helps venture investors understand whether the product is important enough for a defined customer to use, pay for and continue buying. The method depends on the stage and business model, but the central task is to turn customer claims into evidence that can affect the investment decision.

Start with specific hypotheses

Choose the questions that matter most to the investment thesis. Examples include whether the customer has a costly recurring problem, whether the product offers a meaningful advantage, or whether adoption depends on one champion. These questions determine which customer groups to interview and which data to request.

Choose a sample that can challenge the thesis

Interview a mix of active users, paying buyers, recently churned customers and prospects who evaluated the product but declined. A company-supplied reference group can be useful for product detail while often overrepresenting satisfied accounts. Request permission and follow confidentiality obligations.

Ask about observed behavior

Useful questions include: What problem triggered the purchase? What was the previous solution? Who approved the budget? Which workflow uses the product? What outcome changed? What would happen if access disappeared? Which costs, integration steps or team approvals make switching difficult? Ask for examples and dates rather than general satisfaction scores.

For a commercial customer, compare reported value with available evidence such as usage logs, renewals, contract expansion or a procurement decision. A favorable quote supports a qualitative view of enthusiasm; repeated behavior may provide stronger evidence of durable demand.

Connect interviews with the right operating data

For subscription products, examine NRR and GRR, cohort trends and the largest accounts. For marketplaces, review repeat transaction behavior and concentration. The cohort retention guide helps distinguish exact-period engagement from returning at any later point.

Example: the company reports 90% annual GRR. Its largest customer represents 18% of starting recurring revenue and is approaching renewal. The investor should inspect that account's contract, usage, renewal risk and contribution to the reported cohort outcome before interpreting the blended 90% figure.

Separate observation from interpretation

Record the interview date, respondent's role, customer segment, product usage, source limitations and relevant quotes. Then write what the evidence supports and which competing explanations remain. An enthusiastic customer can coexist with poor retention in a wider market segment.

Prepare a six-question customer reference template

1. What problem prompted you to seek a solution?
2. Which alternatives did you evaluate, including the previous workflow?
3. Who approves the spending, and who actually uses the product?
4. What observable outcome has changed since you started using it?
5. What might cause you to reduce spending or stop using the product?
6. How do you expect your spending or usage to change over the next year?

Adapt the questions to the customer's business model, role and confidentiality requirements.

Decide what else needs verification

A final synthesis should state the strength of customer demand, limits of the sample, evidence still missing and consequences for the investment thesis. Investment memo preparation shows how to carry these findings into a decision request.

Treto's Diligence workspace is designed to keep interviews, source files and open questions with the deal. Relationships can maintain relevant contact context for follow-up, subject to the firm's access and confidentiality obligations.

Questions investors ask

How many customer interviews are enough for VC diligence?

The appropriate sample depends on investment stage, customer concentration, heterogeneity and the decision's consequences. A handful of highly relevant conversations may clarify an early problem hypothesis, while later-stage underwriting often needs wider cohort data and interviews that include dissatisfied or churned customers.

What makes a customer reference credible?

A useful reference identifies the buyer's role, timing, observed behavior and basis for its claims. Its value increases when the respondent can discuss limitations and alternatives. Investors should record how the reference was sourced and avoid treating selected positive interviews as representative of the full customer population.