Market Due Diligence Checklist

Why Market Diligence Matters

Market diligence answers one question: can this company become big enough to matter? A brilliant team and a working product still fail if the market is too small, too slow-growing, or too crowded to support venture-scale returns. This checklist walks through the three layers investors actually test, market sizing, market dynamics, and competitive analysis, so you can diligence a market with the same rigor you apply to the financials.

Market Sizing

Start with the total addressable market (TAM) and work down. Bottom-up TAM counts real customers at real prices, the most defensible number, because it is built from evidence rather than analyst reports. Top-down TAM from industry reports is a useful cross-check but tends to overstate; treat it as an upper bound. SAM narrows the TAM to the segments you can actually serve given geography, regulation, and product scope. SOM is the slice you can realistically capture in the planning horizon, the number that pays the bills.

• Bottom-up TAM (customers × price)
• Top-down TAM (industry reports)
• SAM (segment you can serve)
• SOM (revenue you can capture)

Market Dynamics

Sizing tells you how big the market is; dynamics tell you which way it is moving. Growth rate is the single most important dynamic, a startup riding a fast-growing market benefits from tailwinds that no amount of execution can manufacture in a flat one. Regulatory environment matters both ways: tailwinds (mandates, subsidies) can accelerate adoption, headwinds (approval processes, compliance costs) can stretch timelines. Seasonality and cyclicality affect cash flow timing and should shape runway assumptions, not just revenue forecasts.

• Growth rate (CAGR >15% preferred)
• Market maturity (early/rapid growth/accretive?)
• Regulatory environment (tailwinds or headwinds?)
• Seasonality and cyclicality

Competitive Analysis

Map the full competitive set before judging the moat. Direct competitors solve the same problem; indirect competitors solve adjacent problems with different approaches, and they often win by surprise. Potential entrants matter most in markets with low switching costs or high gross margins, because those attract capital. The moat itself, network effects, switching costs, proprietary technology, distribution lock-in, is the answer to the question every investor must ask: what stops the copycat?

• Direct competitors (who solves the same problem?)
• Indirect competitors (who solves adjacent problems?)
• Potential entrants (who could enter this market?)
• Competitive moat (network effects, switching costs, proprietary tech)

Putting It Together

Assign a pass, question, or fail to each item, then look at the pattern. One red flag is a conversation; three is a thesis problem. A useful cross-check: does the startup's own momentum match the market's momentum? A team accelerating its engineering output in a fast-growing market is compounding two tailwinds; the same team in a stagnant market is running hard to stand still. GitDealFlow's engineering signals, commit velocity, contributor growth, repository expansion across 350+ startups, give you the execution side of that equation from public data.