VC & PE Glossary
What Is SOM?
Updated
Definition
SOM — serviceable obtainable market — is the slice of SAM a company can realistically capture in a defined period given product, GTM, and competition — the near-term revenue opportunity investors ask founders to size.
Useful for: Founders, Investors
SOM (serviceable obtainable market) is the revenue you can plausibly win in the next planning horizon — the bottom of the TAM / SAM / SOM stack investors expect in pitch decks.
How it works
Start with TAM — total demand if you owned the category. Narrow to SAM — segments you can serve with current product and geography. SOM applies execution constraints: sales headcount, win rates, churn, and competitive share caps.
Example: a vertical SaaS vendor might show $20B TAM, $2B SAM in mid-market manufacturing, and $40M SOM over three years based on 200 target accounts at $200K ACV with realistic conversion.
Bottom-up SOM — accounts × price × attach rate — beats top-down percentages of giant TAM numbers in diligence.
Why it matters
- Founders: SOM grounds hiring and fundraising asks. Hitting SOM builds credibility for SAM expansion stories.
- Investors: They stress-test whether SOM supports venture returns at entry valuation — a huge TAM with tiny SOM can still be a great seed bet if expansion path is clear.
Common mistake
Labeling entire SAM as SOM without a sales and marketing plan — investors treat it as hand-waving.
Related ideas
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Common questions
Short answers for founders, LPs, and operators