---
title: "What Is SOM?"
term: "SOM"
description: "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."
date: 2026-07-25T00:00:00.000Z
updated: 2026-07-25T00:00:00.000Z
topics: ["venture-capital"]
source: https://venturecapitaltracker.com/glossary/som
---

# What Is SOM?

> 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.

**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

- [TAM](/glossary/tam)
- [Bottom-up TAM](/glossary/bottom-up-tam)
- [Beachhead market](/glossary/beachhead-market)

## FAQ

### What is SOM in simple terms?

If SAM is everyone you could serve with your product, SOM is the portion you can actually win in the next few years — based on sales capacity, geography, and competitive reality — not the whole universe.

### Why does SOM matter?

Investors fund plans, not trillion-dollar TAM circles. Credible SOM connects headcount, pricing, and pipeline to revenue forecasts founders can hit or exceed.


---
Source: https://venturecapitaltracker.com/glossary/som