How to Conduct Market Diligence for an Early-Stage Startup

Market diligence asks whether the company is addressing a significant customer need in a market it can reach and serve economically. A large headline market estimate offers limited guidance until the investor understands who buys, what triggers the purchase and which alternatives customers consider.

Work from the proposed customer and buying decision outward. Interview buyers, review distribution constraints and examine the business model before accepting the top-down market figure in a pitch deck.

Describe the actual buying unit

Name the buyer, user, budget holder and reason to change existing behavior. A hospital procurement committee, an individual clinician and an insurer may all appear in a healthcare market, while only one controls the specific purchase being underwritten.

Map the current alternatives

Include direct competitors and the status quo: spreadsheets, outsourced services, in-house teams or doing nothing. Ask why buyers choose an alternative and what it would take to switch. Record which claims came from customers, published data or the founding team.

Build the addressable market from operating assumptions

Use TAM, SAM and SOM to distinguish broad market spending from the customers this business can serve and reasonably win. Bottom-up assumptions should specify account count, buyer eligibility, expected annual spending and attainable distribution.

Illustration: a startup serves 8,000 eligible buyers and might earn $12,000 annually from each at full adoption. That describes a $96 million annual revenue opportunity under the stated market and pricing assumptions. A lower attainable share should be modeled separately from the broad eligible universe.

Investigate demand and distribution

Review budget cycles, procurement procedures, integration requirements, legal restrictions and the people who influence purchase decisions. A category can be large and expanding while the startup still faces a costly path to reach customers.

Translate customer interviews into an evidence table: who was interviewed, date, buyer segment, current solution, evidence of budget, switching cost and relevance to the investment thesis. Strong statements deserve a traceable basis.

Analyze market structure and competition

Understand whether the economics concentrate around a few major platforms, whether customers can switch and whether suppliers, regulation or network effects create meaningful constraints. Competition can provide evidence that customers spend money in a category; the investor still needs to test the startup's route to a differentiated position.

Identify the assumptions that would change the decision

Possible decision gates include a market smaller than the fund's return requirements, a sales cycle longer than modeled cash runway or a distribution dependency the founders have not addressed. The team should identify which uncertain inputs deserve more primary research.

A reusable market-diligence output

Customer definition and buying unit; market boundary; source-backed bottom-up size; alternative solutions; competition; distribution bottlenecks; current market changes; largest uncertainties; research owner and next request. A market map is useful when another investment in the same category appears.

Treto's Diligence workspace is designed to connect research and open questions to the deal. Reusing prior sector work requires checking its dates and sources, as explained in the prior-diligence guide. The investment team remains responsible for assessing the evidence.

Questions investors ask

Is a large TAM enough to justify venture investment?

The addressable market estimate describes a possible spending pool under chosen boundaries and assumptions. An investment case also depends on customer demand, reachable distribution, the company's economics and ownership at exit. The investor should trace market inputs to the actual buyer and product.

How can investors validate startup market sizing?

Cross-check a bottom-up model against independent sources, customer interviews and observed transaction or contract values. State the eligible buyer population, spending definition, reporting period and constraints on market access. Sensitivity analysis can show which assumptions most influence the estimate.