Market & Business
SOM
Serviceable Obtainable Market — the realistic portion of SAM a company can capture in the near term given its current resources, competitive position, and go-to-market capacity.
SOM (Serviceable Obtainable Market) is the subset of the SAM (Serviceable Addressable Market) that a company can realistically capture in a defined time horizon — typically 3–5 years — given its current product, sales capacity, marketing budget, and competitive dynamics.
The TAM/SAM/SOM framework provides three levels of market sizing: - TAM (Total Addressable Market): The theoretical maximum - SAM (Serviceable Addressable Market): What your product/model can realistically serve - SOM (Serviceable Obtainable Market): What you can realistically win
SOM is derived from SAM by applying win rates, sales cycle duration, and competitive considerations. It's the most honest market sizing number and the one most relevant to near-term financial projections.
A reasonable SOM calculation: SAM × Expected Market Share = SOM. If your SAM is $2B and you expect to capture 5% in 5 years, your SOM is $100M.
In Practice
A cybersecurity startup has a SAM of $3B (U.S. mid-market companies needing endpoint protection). With a 10-person sales team, a 6-month sales cycle, and two strong competitors already owning 60% of the market, a realistic 5-year SOM is $90M (3% market share) — not the $300M the team initially projected.
Why It Matters
SOM is the number that connects market sizing to revenue projections. If your 5-year ARR target is $100M but your SOM is only $50M, one of those numbers is wrong. Investors use SOM to stress-test whether the business plan is achievable and whether the company has a clear path to a meaningful outcome from its current strategy. SOM also validates that the team understands its competitive reality.
VC Beast Take
SOM is where most pitch decks fall apart. Founders calculate a huge TAM, apply a tiny percentage ('if we capture just 1%...'), and call that a conservative estimate. But that math ignores sales cycle length, competitive churn, customer concentration, and the years it takes to build distribution. A credible SOM requires bottoms-up reasoning from real sales data — not top-down percentage extrapolation from an industry report.