Serviceable obtainable market (SOM)

Serviceable obtainable market, or SOM, estimates the portion of a serviceable market a company could realistically capture over a defined period. It is smaller than SAM because it accounts for competition, distribution capacity, geography, sales cycles, supply, and the company’s own execution limits.

A credible SOM is connected to a go-to-market model. For example, an enterprise startup might use the number of sales representatives, expected productivity, contract value, and eligible accounts to estimate five-year revenue. A marketplace might model the cities it can launch and the transaction volume each mature city could support. In a pitch deck, SOM is not a promise and should not be presented as an arbitrary one-percent share of a giant TAM. Investors want to see the mechanism that makes the share reachable. Founders should state the horizon, show assumptions, and reconcile the estimate with financial projections. The exercise is valuable because it exposes whether market ambition, distribution resources, and the fundraising plan actually fit together.